Fluid flow and heat transfer in the evaporating thin film region
Fluid flow and heat transfer in the evaporating thin film region
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DOI：
10.1007/s10404-007-0172-5
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发表时间：
2008-03
影响因子：
2.8
通讯作者：
Hongbin Ma;Peng-fei Cheng;B. Borgmeyer;Y. Wang
中科院分区：
文献类型：
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作者：
Hongbin Ma;Peng-fei Cheng;B. Borgmeyer;Y. Wang
蒸发薄膜区域是在液/固界面处超过表观接触线的延伸弯月面。薄膜蒸发在高效热管中起着关键作用。详细的数学模型预测通过薄膜区域的流体流动和传热。该模型考虑了惯性力、分离压力、表面张力和曲率的影响。利用阶次分析，该模型被简化，并可以数值求解的薄膜的轮廓，界面温度，弯月面半径，热流分布，速度分布，和质量流量在蒸发薄膜区域。计算结果表明，惯性力对薄膜轮廓、界面温度、弯月面半径、热流密度分布、速度分布和质量流率都有影响，特别是在非蒸发区附近，惯性力的影响可以忽略不计。研究发现，对于给定的曲率半径，存在最大速度、最大热流和最大曲率，但这些最大值的位置不同。
The evaporating thin film region is an extended meniscus beyond the apparent contact line at a liquid/solid interface. Thin film evaporation plays a key role in a highly efficient heat pipe. A detailed mathematical model predicting fluid flow and heat transfer through the thin film region is developed. The model considers the effects of inertial force, disjoining pressure, surface tension, and curvature. Utilizing the order analysis, the model is simplified and can be numerically solved for the thin film profile, interfacial temperature, meniscus radius, heat flux distribution, velocity distribution, and mass flow rate in the evaporating thin film region. The prediction shows that while the inertial force can affect the thin film profile, interfacial temperature, meniscus radius, heat flux distribution, velocity distribution, and mass flow rate, in particular, near the non-evaporating region, the effect can be neglected. It is found that a maximum velocity, a maximum heat flux, and a maximum curvature exist for a given superheat, but the locations for these maximum values are different.