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首页> 外文期刊>Journal of Thermophysics and Heat Transfer >Microscale Heat and Mass Transport of Evaporating Thin Film of Binary Mixture
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Microscale Heat and Mass Transport of Evaporating Thin Film of Binary Mixture

机译：二元混合物蒸发薄膜的微观尺度传热传质

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摘要

Analytical and computational studies are presented to examine the effect of binary mixture (pentane/decane) on the microscale heat and mass transport of an evaporating meniscus formed inside a two-dimensional slotted pore. Mass conservation in the liquid film is combined with the momentum equations, energy balance, and normal stress balance and then scaled yielding two constitutive equations: 1) a fourth-order, nonlinear, ordinary differential equation for thin-film profile [Eq. (27)] and 2) a first-order, linear, ordinary differential equation for concentration profile [Eq. (30)]. The numerical results showed that the magnitude of distillation-driven capillary stress due to the composition gradient of a binary mixture can be larger than the thermocapillary stress due to temperature gradient while they are acting in opposite direction. Henceforth, the proof-of-concept has been established in that the binary mixture could facilitate improvement of the evaporating thin-film stability. It was also shown that the resulting stress elongated the length of the evaporating thin-film region without degradation of heat transport effectiveness.
机译：进行了分析和计算研究，以研究二元混合物（戊烷/癸烷）对二维带缝孔内形成的蒸发弯液面的微观尺度传热和传质的影响。液膜中的质量守恒与动量方程式，能量平衡和法向应力平衡相结合，然后按比例缩放生成两个本构方程：1）薄膜轮廓的四阶非线性常微分方程[等式。 （27）]和2）浓度分布的一阶线性常微分方程[等式。 （30）]。数值结果表明，当二元混合物的组分作用方向相反时，由二元混合物组成梯度引起的蒸馏驱动毛细应力的大小可以大于因温度梯度引起的热毛细管应力的大小。从此以后，已经建立了概念证明，因为二元混合物可以促进改善蒸发的薄膜稳定性。还显示出，所产生的应力延长了蒸发的薄膜区域的长度，而没有降低传热效率。

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