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首页> 外文期刊>Experimental Thermal and Fluid Science: International Journal of Experimental Heat Transfer, Thermodynamics, and Fluid Mechanics >Measurement of temperature profile near the evaporating interface in an annular pool with radial temperature gradients at low pressures
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Measurement of temperature profile near the evaporating interface in an annular pool with radial temperature gradients at low pressures

机译：测量环形池中蒸发界面附近的温度曲线，低压下的径向温度梯度

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摘要

In order to understand the energy transfer mechanism and the coupling relationship between the interface evaporation and thermocapillary convection at low vapor pressures, a series of precise temperature measurements were conducted in a water-filled annular pool with radial temperature gradient. The initial depth of water in the annular pool is 10 mm and the temperature difference between the inner and outer cylinders ranges from 3 degrees C to 8 degrees C. The result shows that thermocapillary convection occurs in the liquid pool during the evaporation process. Two flow patterns of thermocapillary convection are presented depending on the vapor pressure ratio. There is always a uniform temperature layer below the liquid-vapor interface, where the energy required for evaporation is transferred by thermocapillary convection from the cylinders to the evaporation interface. The thickness of the uniform temperature layer is related to the pressure ratio and the flow pattern of thermocapillary convection. Furthermore, there is an obvious interface temperature jump during the evaporation process at low pressures. The temperature of vapor side is always higher than that of liquid side. The maximum temperature jump appears near the outer cylinder.
机译：为了了解能量转移机制和界面蒸发与低蒸汽压力的热量量对流之间的耦合关系，在具有径向温度梯度的充水环形池中进行一系列精确的温度测量。环形池中的初始水深度为10mm，内圆柱和外筒之间的温度差距为3摄氏度至8℃。结果表明在蒸发过程中在液体池中发生热量量对流。根据蒸汽压力比提出了两种热量捕集对流的流动模式。液体蒸汽界面下方总存在均匀的温度层，其中蒸发所需的能量通过从气缸的热量对流转移到蒸发界面。均匀温度层的厚度与热量比对流的压力比和流动模式有关。此外，在低压下蒸发过程中存在明显的界面温度跳跃。蒸汽侧的温度总是高于液体侧的温度。外筒附近出现最大温度跳跃。

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