Water scarcity and waste plastics elimination are long-term problems facing sustainable development, and solar interface evaporation to produce clean water is regarded as a promising water treatment technology. Herein, we report on low-cost waste plastic bottles synthetic carbon-based photothermal materials. By KOH activation and perforation, the surface crack structure of porous carbon is formed to facilitate multi-stage reflection of solar light, and significantly improve the solar light absorbance and photothermal conversion ability. Three-dimensional solar evaporators with low thermal conductivity and super hydrophilic wood sponge are fabricated, and the rectangular hole is designed to regulate water movement and prevent heat dissipation. When exposed to 1 sun illumination (1 kW/m(2)), an evaporation rate of 1.59 kgm-(2)h-(1) is achieved, along with an energy conversion efficiency of 88.49 %. In addition, different micro-surface rough structures are constructed to boost the solar light absorption, thereby enhancing the photothermal conversion ability, among which the micro-cone structure increased the evaporation rate to 1.93 kgm(-2)h(-1), demonstrating excellent stability over 15 cycles. In the simulated sewage purification process, the removal rate of pollutants is 99.9 %, and the evaporator without obvious salt accumulation in the seawater for 24 h, showing good salt resistance and self-cleaning ability. This research has important reference value for high-value preparation of carbon-based photothermal materials from waste plastics, extraction of clean water and environmental sustainable protection.

Magnetic hyperthermia therapy (MHT) represents an innovative approach to cancer treatment, harnessing the therapeutic capabilities of magnetic nanoparticles. Fe3O4 nanoparticles are often considered ideal candidates for MHT because of their biocompatibility. However, the clinical application of Fe3O4 nanoparticles is hindered by their low heating efficiency and concerns regarding potential toxicity linked to the high concentrations required to achieve therapeutic effects. In this study, two unique structures, hollow spherical and nanoflower Fe3O4, were successfully synthesized to enhance their magnetothermal conversion efficiency. The results indicate that Fe3O4 nanoflowers exhibit an intrinsic loss power (ILP) value of 6.52, which is 1.83 times greater than the ILP of hollow spherical Fe3O4 (3.55), indicating its enhanced potential for MHT applications. The COMSOL simulation demonstrated that higher magnetic field frequencies and intensities elevate tissue temperature and damage in tumor cells, particularly at 100 kHz and 400 kHz, with tumor tissue damage scores rising to 0.28 and 0.93, respectively. Shorter heating durations, such as 6 min, minimize harm to healthy tissue and are ideal for treatments requiring multiple sessions. After 12 min, tumor scores rose to 0.85, while normal tissue scores were 0.34, suggesting that longer durations improve therapeutic effects on tumors but also heighten the risk to healthy cells. This research provides a scientific foundation for selecting materials in the context of MHT for cancer treatment, potentially paving the way for more effective and safer therapeutic strategies.

Flame instability is a key problem that needs to be solved, and the existing improvement methods are still insufficient. Different from the traditional single structure improvement, a novel synergistic combustion stabilization method is proposed. In this paper, the conventional blunt body is slotted to achieve "graded combustion", and the front baffle is embedded on the slotted blunt body to guide fuel flow, thus strengthening the combustion and improving the flame stability. With the help of simulation software Fluent, the combustion characteristics of conventional blunt body micro combustor (CMC), conventional slotted blunt body micro combustor (MCESB) and front-baffle slotted blunt body micro combustor (MCESB-FA) are compared, and further researched the flow characteristics and inlet velocity. According to the findings, the synergistic action of slotted blunt body and baffle is beneficial to improve combustion performance and flame stability, MCESB-FA demonstrates the highest combustion efficiency, the flame breaking limits of the MCESB-FA up to 80 m/s. Besides, the turbulent kinetic energy behind the blunt body is significantly increased, which is conducive to the heat transfer for the central combustion zone and the cold fuel on both sides, so as to achieve strengthening combustion. Interestingly, the backflow area disappears due to the slotting, but the front-baffle embedding breaks the original fuel flow balance and re-forms the backflow area to achieve steady combustion. Finally, as inlet velocity increase, the MCESB-FA and MCESB have better combustion performance and flow distribution, especially under the combination of slotted blunt body and front-baffle.

Uneven temperature on the electronic chip surface can cause local hotspots, which can seriously affect the service life of electronic devices. Therefore, in this work, a concept of variable density design through the local structure of the heat sink is introduced to solve the heat dissipation of the chip surface with local high heat flux hotspots. The cooling performance of local hotspots was investigated by a local variable density design of the jet nozzle holes and the hybrid of the variable density design of the jet nozzle holes and the micro pin fin arrays on the impact surface. It is found that the local variable density design of the jet nozzle holes on the diverter plate has a significant strength in improving the heat dissipation of local hotspots compared to the uniform design. In addition, the hybrid design significantly improves the cooling characteristics of the local hotspots, especially the local hotspots located in the center stage. Moreover, the ultimate heat flux that local hot spots can withstand was also analyzed and the results showed that the local variable density structure can reach 700 W/cm2 for a local hotspot, which shows an excellent cooling performance to the local hotspots with high heat flux

The rapid advancement of micromachining technology has led to the proliferation of micro-combustors in both civilian and military applications, and the actual operation process requires the ability to adapt to complex working conditions. The sudden change of the operating conditions poses a huge threat to the flame stability in micro-combustion, but the flame regulation, especially the adaptive regulation, has proved to be challenging under the sudden change of inlet velocity. In this paper, we report a novel method that significantly improves combustion performance, including heat transfer enhancement under steady-state conditions and adaptive stable flame regulation under velocity sudden increase. We successfully harnessed the synergistic benefits of both the front and rear baffles, investigated the angle matching of the baffles at various inlet velocities, and employed nitinol memory metal as the baffle material to examine its impact on enhancing heat transfer and flame control behavior. According to the results, under the synergic action, the combustion efficiency reaches to 96.92%, and the baffle angle matching 60 degrees + 30 degrees shows good combustion performance at medium-low velocity, and a flame breaking limit of 92 m/s is obtained at 0 degrees + 0 degrees with high-velocity condition. In addition, nitinol alloy is selected as the deformation baffle material, the flame breaking limit is further extended by 6 m/s, and the combustion efficiency can still be maintained at 0.45 ms by a velocity sudden increment of 60 m/s, and the pressure loss is reduced by more than 70%. This study is helpful to provide a reference for the steady combustion under the sudden change of micro-scale conditions, and provides a new idea for the adaptive control of flame.

This work reports on the optimization of a porous diverter plate for a micro-jet heat sink to obtain the optimum jet nozzle diameter and flow opening ratio, which play a significant role in the cooling characteristics of heat sinks for electronic chips. An artificial neural network (ANN) model was used to optimize and predict the sensitivity of different parameters (coolant flow rate, opening ratio, and jet nozzle diameter) on the operation of the heat sink design. It was found that smaller opening ratios and jet nozzle diameters in the range of 2.0–3.2 mm had a positive effect on improving the heat sink's thermal performance. Moreover, the diverter plate's opening ratio had a major sensitivity to pumping power, while the jet nozzle diameter had the lowest sensitivity. Finally, the overall cooling characteristics of all the designs were evaluated using the PPTR parameter, and the results demonstrate that the porous diverter plate with an opening ratio of 0.08 and a jet nozzle diameter of 1.81 mm yielded the optimum design for the porous diverter plate of the heat sink.

Based on the fact that tumor cells are more thermolabile and less oxygen resistant than normal cells, a novel minimally invasive tumor treatment modality, magnetic hyperthermia (MHT) is proposed. However, magnetic materials, which are necessities in MHT, are toxic to human tissue if they are excessively employed. Thus, magnetic materials with higher specific absorption rate (SAR) and intrinsic loss power (ILP) values becomes imperative to minimize their clinical application while mitigating damage to normal human tissues under identical treatment temperature conditions. In this study, the incorporation of soft magnetic MnFe2O4 into hard magnetic CoFe2O4 was introduced, leveraging the exchange coupling between these materials to enhance the magnetic saturation (Ms). Subsequently, we combined these magnetic nanomaterials with graphene oxide (GO) to establish an efficient heat conduction pathway, further augmenting the specific absorption rate (SAR) value of the resulting magnetic composites. Our findings reveal that the Mn0.5Co0.5Fe2O4-1%GO composite developed in this investigation boasts superior SAR values and intrinsic loss power (ILP) of 49.7 W/g and 5.90 nHm2/kg, respectively, when compared to other magnetic materials. The nanomaterials synthesized in this study have the potential to significantly enhance the effectiveness of tumor magnetothermal therapy.

Due to the relatively low efficiency of magnetic hyperthermia and photothermal conversion, it is rather challenging for magneto-photothermal nanoagents to be used as an effective treatment during tumor hyperthermal therapy. The advancement of magnetic nanoparticles exhibiting a vortex-domain structure holds great promise as a viable strategy to enhance the application performance of conventional magnetic nanoparticles while retaining their inherent biocompatibility. Here, we report the development of Mn0.5Zn0.5Fe2O4 nanoflowers with ellipsoidal magnetic cores, and show them as effective nanoagents for magneto-photothermal synergistic therapy. Comparative studies were conducted on the heating performance of anisometric Mn0.5Zn0.5Fe2O4 (MZF) nanoparticles, including nanocubes (MZF-C), hollow spheres (MZF-HS), nanoflowers consisting of ellipsoidal magnetic cores (MZF-NFE), and nanoflowers consisting of needle-like magnetic cores (MZF-NFN). MZF-NFE exhibits an intrinsic loss parameter (ILP) of up to 15.3 N h m2 kg-1, which is better than that of commercial equivalents. Micromagnetic simulations reveal the magnetization configurations and reversal characteristics of the various MZF shapes. Additionally, all nanostructures displayed a considerable photothermal conversion efficiency rate of more than 18%. Our results demonstrated that by combining the dual exposure of MHT and PTT for hyperthermia treatments induced by MZF-NFE, BT549, MCF-7, and 4T1 cell viability can be significantly decreased by similar to 95.7% in vitro. In order to improve magnetic hyperthermia and photothermal efficiency, magnetic nanoflowers with ellipsoidal magnetic cores with magnetic vortex configuration were synthesized to enhance hyperthermia efficacy.

Based on the fact that tumor cells are more thermolabile and less oxygen resistant than normal cells, a novel minimally invasive tumor treatment modality, magnetic hyperthermia (MHT) is proposed. However, magnetic materials, which are necessities in MHT, are toxic to human tissue if they are excessively employed. Thus, magnetic materials with higher specific absorption rate (SAR) and intrinsic loss power (ILP) values becomes imperative to minimize their clinical application while mitigating damage to normal human tissues under identical treatment temperature conditions. In this study, the incorporation of soft magnetic MnFe 2 O 4 into hard magnetic CoFe 2 O 4 was introduced, leveraging the exchange coupling between these materials to enhance the magnetic saturation ( M s ). Subsequently, we combined these magnetic nanomaterials with graphene oxide (GO) to establish an efficient heat conduction pathway, further augmenting the specific absorption rate (SAR) value of the resulting magnetic composites. Our findings reveal that the Mn 0.5 Co 0.5 Fe 2 O 4 -1%GO composite developed in this investigation boasts superior SAR values and intrinsic loss power (ILP) of 49.7 W/g and 5.90 nHm 2 /kg, respectively, when compared to other magnetic materials. The nanomaterials synthesized in this study have the potential to significantly enhance the effectiveness of tumor magnetothermal therapy.

In the study, based on the purpose of efficient catalytic AB for hydrogen production, the photochemical properties influence of metal(Ru, Ni) and nonmetal(B,P) elements doping on the g-C3N4 are studied systematacially. The design method of high performance bifunctional catalyst of photocatalysis and metal catalysis are provided. The results have proved that both non-metals B, P and metal Ru, Ni have an efficient regulatory effect on the band structure of g-C3N4, which make the band gap of the clean monolayer g-C3N4(001) decrease from 1.175 eV to 0.261eV(B-g-C3N4(001)) and 0.671eV(P-g-C3N4(001)), 0.164 eV(Ni-g-C3N4(001)) and 0.260 eV(Ru-gC3N4(001)), respectively. B element have the better modification effect compared with the P element. The reduction of band gap is attributed to the electronic orbit modification effect of impurity element B, P, Ni, Ru in g-C3N4. Ru metal doped g-C3N4 is reduces the barrier of O-H bond breakage of CH3OH(reduced from 4.551 eV to 1.530 eV), which is beneficial to the hydrogen-producing reaction of AB alcoholysis. The construction and design of a new bifunctional catalyst(photocatalysis and metal catalysis) RuNiB@g-C3N4 is an efficient route in catalyze AB for hydrogen production. The process of molecule NH3BH3, CH3OH and H2O adsorbed on the B-gC3N4 are exothermic process, the adsorption energy are -1.562 eV, -1.392 eV and -1.443 eV, respectively. AB is preferentially adsorbed on the B-g-C3N4 catalyst, increasing the adsorption energy of CH3OH and H2O on B-gC3N4-based catalysts is beneficial to the hydrogen production from AB. The study provides a theoretical method for the research on the technology of the coupling of metal catalysis/photocatalysis ammonia borane to produce hydrogen.

The thermal management issue of high electronic chips with heat flux is one of the most challenge during the development of electronic devices. In this work, the design of micro pin fin arrays (MPFA) of micro-jet heat sink was proposed to achieve effective cooling of electronic chips. The MPFA with different cross-sectional shapes were used to improve the thermal performance of the heat sink. The results show that heat sink design with MPFA exhibit excellent cooling performance while consuming approximately the same amount of power as smooth surface. In addition, the hexagonal cross-section has better thermal performance, the temperature uniformity of the heating surface can be improved by up to 70 % and the average temperature can be reduced by 7-20K. Moreover, the manufacturing cost and cooling performance per unit cost were investigated and the results show that the square cross-section is the most commercially viable. Based on this, the square cross-section was parametrically studied, including the length to height ratio and fins number. It was founded that the heat sink exhibits better thermal performance for a length-to-height ratio of 1.4 and a number of fins of 169. Finally, the ultimate heat flux of the electronic chip can be withstood was also tested, and the optimal heat sink design can handle heat flux of 400W/cm2. Therefore, the heat sink with MPFA design can significantly improve the thermal performance without consuming the pump power, which can be used to cooling the high electronic chips with high heat flux in the future.

Alternative cancer treatments such as photothermal therapy(PTT)and magnetic hyperthermia (MHT) techniques have been studied to showpromising potential as supplementary modalities. However, such techniqueshave their own limitations; for instance, highly concentrated intratumoralinjections of magnetic nanoparticles are required to compensate theirlow specific loss power under safe and low magnetic field intensityfor the MHT, while the PTT has limitations in the treatment of deep-seatedtumors due to low light penetration. Here, the decoration of the multi-walledcarbon nanotube (MWCNT) surface by magnetic nanoparticles (& AP;8.5nm) was achieved by a hydrothermal method and the development of MWCNT/Mn0.5Zn0.5Fe2O4 (MZFC) hybridsfor magneto-photothermal dual-mode cancer therapy. The obtained specificloss power of the MZFC hybrids is found to be at least 1 order ofmagnitude higher, with improvement from & SIM;19 W/g to 225 W/g,under the excitation of both an AMF with a magnetic field intensityof 6.4 kA/m and a frequency of 300 kHz and a simultaneous NIR laserof 0.5 W/cm(2) irradiation. The synergistic utilization ofthe photothermal and magnetic properties of MZFC effectively diminishesthe required magnetic field amplitude and NIR laser power density.Our in vitro cell experiments confirmed that the thermal effects mediatedby the MZFC after endocytosis delivered enhanced cytotoxicity in thepresence of dual excitation of NIR laser and AMF. These findings indicatethat MZFC nanohybrids possess significant potential as targeted nanoheatingagents for hyperthermia applications.

Aiming to improve the energy output of micro thermophotovoltaic systems, and the thermal performance of the embedded bionic Y-shaped fins(BYF) micro-combustor is further explored, the influence of different fractal angles (30 degrees, 60 degrees and 90 degrees) of the BYF are studied. The results show that the thermal performance of the novel one at different fractal angles are superior to traditional one. The novel one can reach 1309.2 K, 1315.1 K and 1332.2 K for outer wall temperature when the fractal angles are 30 degrees, 60 degrees, and 90 degrees, respectively. However, the traditional one is 1129.8 K. Moreover, the energy efficiency and energy output of the novel micro combustor are also much higher than the conventional ones. The exergy efficiency of the novel one can reach 44.19 %, 44.80 % and 44.80 % when the fractal angle is 30., 60. and 90., respectively, while the traditional one is 27.26 %. However, the temperature uniformity of the novel one decreases with the increase of the fractal angle. In addition, the silicon carbide solid wall material exhibits excellent outer wall temperature uniformity due to its high thermal conductivity.

In this work, a liquid-jet-cooled heat sink having a microporous flow diverter plate is proposed for the reduction of the maximum operating chip temperature, while simultaneously achieving uniform cooling rates. Different diverter opening ratios (ratio of the macroporous openings to the total diverter plate area) were considered, and the results indicate that the smaller opening ratios create a visible tradeoff between hydraulic and thermal performance. The contrast between thermal and hydraulic performance was assessed using the PPTR overall performance parameter. The heat sinks with smaller opening ratio diverters had better thermal performance and achieved more uniform temperatures than heat sinks with larger opening ratios. The results show that small opening ratio diverters produce higher flow velocities through the nozzles, thus increasing the pressure loss of the heat sinks. The results indicate that heat sinks with small opening ratios yield the lowest thermal resistance at the same pumping power input. In order to eliminate the recirculation zone of the flow chamber, three parametric structures were proposed. The parameterization of the flow chamber eliminated the recirculation regions, but pressure drop reductions of approximately 2.4% to 3.4% were obtained. It was concluded that the recirculation zone of the flow chamber had little effect on pressure drop, while more attention should be put into the openings of the diverter plate.

Photothermal therapy (PTT) and magnetic hyperthermia have emerged as promising techniques for augmenting conventional cancer treatments, such as chemotherapy and radiotherapy. However, both treatments have their inherent drawbacks, such as PTT being limited by the depth of laser penetration while magnetothermal therapy being limited by the high concentration compensation brought by a low specific absorption rate. To address this challenge, we have successfully synthesized multifunctional nanohybrids comprising magnetic nanoparticles Mn0.5Zn0.5Fe2O4 (MZF) with an average diameter of 8.5 nm coated with a light-absorbing polymer responsive to near-infrared radiation, polypyrrole (PPy). Subsequently, the nanocomposite was functionalized with poly(ethylene glycol) (PEG) to obtain MZF/PPy-PEG nanoparticles with an average diameter of 190 nm. The core-shell MZF/PPy-PEG demonstrates an effective magnetic heating effect, a photothermal stability, and a photothermal conversion efficiency of 34.6%. In addition, the PPy shell, being an organic polymer, exhibits the capability to encapsulate anticancer drug (DOX), enabling synergistic magnetothermal-PTT and chemotherapy . Our findings offer a promising approach for synergistic magneto-PTT and chemotherapy, providing an efficient treatment for cancer.

Conventional magnetic nanoagents in cancer hyperthermia therapy suffer from a low magnetic heating efficiency. To address this issue, researchers have pursued magnetic nanoparticles with topological magnetic domain structures, such as the vortex-domain structure, to enhance the magnetic heating performance of conventional nanoparticles while maintaining excellent biocompatibility. In this study, we synthesized hollow spherical Mn0.5Zn0.5Fe2O4 (MZF-HS) nanoparticles using a straightforward solvothermal method, yielding samples with an average outer diameter of approximately 350 nm and an average inner diameter of about 220 nm. The heating efficiency of the nanoparticles was experimentally verified, and the specific absorption rate (SAR) value of the hollow MZF was found to be approximately 1.5 times that of solid MZF. The enhanced heating performance is attributed to the vortex states in the hollow MZF structure as validated with micromagnetic simulation studies. In vitro studies demonstrated the lower cell viability of breast cancer cells (MCF-7, BT549, and 4T1) after MHT in the presence of MZF-HS. The synthesized MZF caused 51% cell death after MHT, while samples of MZF-HS resulted in 77% cell death. Our findings reveal that magnetic particles with a vortex state demonstrate superior heating efficiency, highlighting the potential of hollow spherical particles as effective heat generators for MHT applications.

Magnetic hyperthermia ablates malignant cells by the heat-dissipating from magnetic nanoparticles (MNPs) when subjects to an alternate magnetic field. To reveal the heat transfer mechanism for magnetic fluid hyperthermia (MFH) and analyze the effect of injection site arrangement on the temperature distribution during magnetic fluid hyperthermia. A three-dimensional multi-physical model was established to obtain the temperature distribution of the treated tumor tissues, the concentration distribution of magnetic fluid, effective treatment volume (V-eff), and thermal damage fraction of the tumor. The treatment temperature distribution for a proposed physical model is predicted by solving Pennes bio-heat transfer equation using the finite element method, in which a heat source in form of a Gaussian distribution is used as the power dissipation of MNPs. The results demonstrate that the size of the heat source has a greater effect on the maximum temperature of the heat source center under a single injection site. Additionally, it found that the effective treatment volume is not the sum of the effective treatment volumes at each injection site for the multisite injections. The effective treatment volume shows a strong nonlinear increase with the number of injection site increases compared with the single injection site. The multisite injection can significantly increase the effective treatment volume during the hyperthermia process and achieve the effect of agglomeration heating. For eight injection sites, the optimal effective treatment volume change rate (epsilon(V)) reached 94.7%. Additionally, the temperature distribution uniformity of eight injection sites is greatly improved compared with other injection site arrangements under an equal dose. The damage fraction of single site injection from 0.12 up to 0.55 when the magnetic hyperthermia treatment time increases from 0 to 40 min while the damage fraction of eight sites injection from 0.23 up to 0.94. In the clinical treatment process, the distance between the injection sites and the time of magnetic hyperthermia can be reasonably arranged according to the size, shape, and type of the tumor, which not only can obtain a good thermal ablation effect but can effectively reduce the thermal damage to normal tissues.

小型温室棚作为农业生产的重要设施,可为农作物创造一个温度适宜的、受保护的生长空间,保证作物正常生长、促进作物早熟.以确保重庆地区春冬季烟苗正常发育、维持温室内适宜的土壤温度为导向,对温室棚内温度进行了试验和数值模拟,探究了温室棚内温度分布规律,并在此基础上分析生物质发酵产热对温室棚内土壤温度场的影响.结果表明:试验中埋设稻壳的温室棚内土壤温度平均提高3.5℃且温室棚中平均温度低于10℃的天数明显减少.埋设稻壳的温室棚中烟苗茎高和叶片数增长值最大,平均茎高从移栽时的7.8 cm增长到了 12 cm,叶片数从平均5片增长到了 11片,均大于未埋设稻壳试验组,这表明土壤中埋设稻壳有助于烟草的生长发育.数值研究表明温室棚内不同深度的土壤层温度变化状况一致,均呈现先降低后升高再降低的趋势.地温随土壤深度的增加而降低,地表下10 cm、20 cm的土壤层区域温度高于10.6℃、8℃,有利于烟苗在低温环境下正常生长.且土壤温度存在一定的昼夜温差,更利于烟苗发育.埋设稻壳的温室土壤层温度变化趋势与未埋设稻壳的温室一致,但其土壤层平均温度、最低温度至最高温度以及昼夜温差分别升高了 2.3℃、1.1-5.5℃、4.8℃.试验和数值研究结果表明稻壳发酵产生的热量可以提高和维持温室内土壤温度,对土壤具有保温和热量补给的作用.

As one vital role component of micro-thermophotovoltaic (MTPV) system, the combustion characteristics of the micro-combustor directly affect the wall temperature distribution and the MTPV system efficiency. Combined with the advantages of counterflow and pin rib arrangement, a counterflow double-channel micro-combustor with pin fins (combustor C) was built to enhance the heat transfer and improve the wall temperature. The combustion performances and radiation performances of single-channel micro-combustor (combustor A), counterflow double-channel micro-combustor (combustor B), and combustor C were investigated and compared under different mass flow rates (4 similar to 12 x 10(-5) kg/s) and equivalence ratios (0.6 similar to 1.4). Results show that the pin fin is of positive significance for the fixation of flame root to improve the combustion stability, combustion efficiency, and radiation energy when the total mass flow rate is high, especially. When the mass flow rate is low, the combustion efficiency of combustor C is the lowest due to the limitation of combustion space. However, with the increase of the mass flow rate, the combustion characteristics of combustor C are the best due to the flame front area is larger among the three combustors and the flame root position is closer to the inlet area. The radiation energy, radiation efficiency, and mean temperature of the upper wall of the combustor C are significantly higher than other combustors under the same conditions. When the total mass flow rate is 12 x 10(-5) kg/s, the radiation energy of combustor C is 0.51 times and 0.36 times that of combustor A and B, respectively. When the equivalence ratio is 1.0, the mean upper wall temperature of combustor C is 175.87 and 128.904 K higher than of combustor A and B, respectively. The counterflow double-channels combustors have better wall temperature uniformity than single-channel combustor under a wide range of working conditions.