Marangoni effect is one of the critical factors in the droplet evaporation process, which is caused by surface tension gradient in the droplet interface. In this study, local heating is adopted to provide a more complicated temperature distribution on the droplet surface, and a detailed numerical investigation is carried out to address the effect of Marangoni flow on the droplet evaporation behaviour. Results show that asymmetric heat source position could result in the droplet morphology being asymmetric, especially for droplets on super-hydrophilic surfaces. The evaporation rate could be affected both by the heat source position and the droplet contact angle. When placed on a smooth substrate, the droplet will slip horizontally as a result of the asymmetric heating condition. The slipping behaviour is affected by both the heat source position and the surface wettability.

Marangoni效应是液滴蒸发过程中的关键因素之一，这是由液滴界面中的表面张力梯度引起的。在这项研究中，采用局部加热以在液滴表面上提供更复杂的温度分布，并进行了详细的数值研究以解决Marangoni流动对液滴蒸发行为的影响。结果表明，不对称的热源位置可能导致液滴形态不对称，特别是对于超亲水表面上的液滴。蒸发速率可能受热源位置和液滴接触角的影响。当放置在光滑的基板上时，由于不对称的加热条件，液滴将水平滑动。