热激励下碳纳米管与水混合体系传质传热的分子动力学模拟
Using Molecular Dynamics to Simulate Mass Transfer and Heat Transfer in the Carbon Nano-tube and Water System under Thermal Excitation

爆发沸腾换热和纳米流体传热具有很重要的理论和实用意义。但由于爆发沸腾传热过程中，液体内部空间温度梯度大，相变速度快，表现出一定的特殊性，纳米流体传热对其传热过程机理的研究，往往需要在实验条件难以实现的空间和时间极限下，充分研究液相和气相内部的温度、压力和运动状态及其空间分布。采用分子动力学的方法，通过对比研究纯水和碳纳米管/水混合体系爆发沸腾过程，对两种体系密度分布、温度场和应力场研究和对比分析，揭示碳纳米管/水混合体系的强化换热机理，探究碳纳米管对混合体系爆发沸腾换热和纳米流体传热的促进作用。
Both explosive boiling transfer and nanofluids transfer are meaningful in theory and practice. In the process of explosive boiling transfer, there is great temperature gradient and high phase velocity inside fluid that, therefore, shows some particularities. As for nanofluids transfer, the exploration of its mechanism needs to comprehensively study liquid temperature, gas temperature, pressure, kinstate and space distribution of nanofluids, however, which can be hardly put into practice because of limited space condition and time condition. Through molecular dynamics, this paper comparatively studies distilled water and the carbon nano-tube and water system, when they are in explosive boiling state, and then analyzes their density distribution, temperature field and stress field. At last, it demonstrates the enhanced heat transfer mechanism of the system and the promotion from carbon nano-tube to the above transfer methods.