Effects of pulse power on evaporation characteristics of an n-heptane droplet in a microtube

•Response of droplet evaporation to air temperature oscillation is studied.•A dynamic equilibrium is found between fuel flowrate and evaporation rate.•Frequencies of evaporation rate, diameter and temperature are consistent.•In phase, evaporation rate is behind diameter by 0.5π, but ahead of temperature.•Amplitude of evaporation rate is subject to interference from its phase.