Based on governing equations of heat and mass transfer as well as Kern-Seaton's Fouling Theory,a thermal resistance model of CaCO3 fouling based on the Surface Chemical Reaction Theory was set up.Then according to the Field Synergy Principle,the fouling process occurring in a transversally corrugated tube where the working fluid was certain concentration of CaCO3 solution was numerically simulated.The fouling processes in various states were simulated via changing the wall temperature,inlet flow velocity and concentration of CaCO3 solution.During the process,in order to evaluate the anti-fouling performance of different transversally corrugated tube patterns in the fouling state,the average field synergy angle and average field synergy number were calculated as well as the fouling deposition rate,removal rate and net fouling deposition rate of all tubes were compared and analyzed.Finally,simulation results were verified by experiments,which verified the correctness of simulation.The results show that the anti-fouling performance of the 10-8-1 type transversally corrugated tube is better than the other two tubes as well as is more suitable for operation conditions with large flow velocity range,besides,each parameter is hardly affected by the concentration of Ca2+ in the working fluid when fouling is up to a dynamic equilibrium state.

The velocity field and temperature field in transversally corrugated tubes of different structure have been numerically simulated,according to the field synergetic principle,the terbulent heat transfer in three kinds of these transversally corrugated tubes has been analysed.Considering the difference of flow resistance is different type of said tubes,the heat transfer ability of said tube types has been comprehensively evaluated and compared,therefrom,the best tube type being obtained.Results of analysis show that the comprehensive heat transfer ability of the best tube type is up to about 1.3 times of that in commonly used transversally corrugated tubes under condition of inlet flow velocity being in a range of 0.5~3 m/s.

The heat transfer and flow resistance performance of transverse corrugated tube and plain tube were experimentally studied.The corresponding correlations for the friction factors and Nusselt number to the Reynolds numbers were also obtained.To study the effects of transverse corrugated tube structure on the average heat transfer coefficient,and discuss the mechanism of heat transfer enhancement,the turbulent intensity,the thickness of thermal boundary layer,the intersection angle between the velocity and fluid temperature gradient and the local Nusselt numbers were calculated by means of numerical simulation for transverse corrugated tube and plain tube,which was responsible for the heat transfer enhancement.The computational evaluations indicate that the transverse corrugated tube can reduce the thickness of thermal boundary layer and increase the turbulent intensity.In addition,the transverse corrugated tube can reduce the intersection angle between the velocity and fluid temperature gradient,and have a good field synergy.