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首页> 外文会议>American Society of Mechanical Engineers(ASME) Summer Heat Transfer Conference(HT2005) vol.2; 20050717-22; San Francisco,CA(UA) >The Influence of Thermal Expansion Flow on Droplet Evaporation
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The Influence of Thermal Expansion Flow on Droplet Evaporation

机译：热膨胀流对液滴蒸发的影响

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摘要

It has been demonstrated recently that it follows from conservation of mass that unsteady temperature fields create flow in an incompressible fluid with a temperature-dependent density even in the absence of gravity. The paper studies the influence of thermal expansion flow on spherically symmetric evaporation of an isolated droplet. A model problem of a droplet evaporating at a constant rate is first considered. In this idealized situation one can use the assumption of a thin thermal boundary layer to solve analytically the unsteady moving-boundary heat conduction problem to find the temperature field inside the droplet both with and without the thermal expansion flow. Next evaporation of a fuel droplet in a diesel engine is studied numerically. The heat diffusion equation is solved in the liquid phase while the standard quasi-steady model is used for the gas phase. The results of the calculation show that for high ambient temperatures the influence of the thermal expansion flow can be considerable.
机译：最近已经证明，由于质量守恒，即使在没有重力的情况下，不稳定的温度场也会在不可压缩的流体中形成具有取决于温度的密度的流动。本文研究了热膨胀流对孤立液滴的球对称蒸发的影响。首先考虑以恒定速率蒸发的液滴的模型问题。在这种理想情况下，可以使用一个薄的热边界层的假设来解析地解决不稳定的移动边界热传导问题，从而找到有和没有热膨胀流的液滴内部的温度场。接下来，对柴油机中燃料滴的蒸发进行了数值研究。在液相中求解热扩散方程，而在气相中使用标准准稳态模型。计算结果表明，对于较高的环境温度，热膨胀流的影响可能会很大。

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