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首页> 外文期刊>International Journal of Heat and Mass Transfer >Temperature measurements near the heating surface at high heat fluxes in pool boiling of 2-propanol/water mixtures
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Temperature measurements near the heating surface at high heat fluxes in pool boiling of 2-propanol/water mixtures

机译：2-丙醇/水混合物池沸腾中高热通量时在加热表面附近的温度测量

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摘要

To examine the mechanism of CHF enhancement with binary mixtures, this paper measured local temperatures close to a heating surface using a micro-thermocouple at high heat fluxes for pool boiling of a 3 mol% of 2-propanol/water mixture on an upward-facing 12 mm diameter circular surface. The variations in temperature traces measured at various locations above the heating surface indicate that the distributions of 2-propanol concentration have strong non-uniformities in the vertical and radial directions: 2-propanol concentration is higher in the vicinity of the heating surface at the central part of the heating surface and lower in the periphery of the heating surface. The local concentration of 2-propanol was determined based on the assumption that low peak values of temperature fluctuations correspond to the local saturation temperatures of the mixture. This assumption enabled a quantitative representation of the concentration distributions in the vertical and radial directions. The variations in the surface tension of the mixture were evaluated based on the deduced local values of the saturation temperature and the composition of the mixture. It was found that near the heating surface the surface tension increases steeply in the direction of the heating surface, suggesting that intensive Marangoni convection is induced at the liquid/vapor interface near the heating surface.
机译：为了检查二元混合物提高CHF的机理，本文使用微热电偶在高热通量下，将3 mol％的2-丙醇/水混合物向上沸腾沸腾，测量了接近加热表面的局部温度。直径12毫米的圆形表面。在加热表面上方各个位置测得的温度曲线变化表明，2-丙醇浓度的分布在垂直和径向方向上具有很强的不均匀性：在中心加热面附近，2-丙醇浓度较高。加热表面的一部分并在加热表面的外围较低。根据以下假设确定2-丙醇的局部浓度：温度波动的低峰值对应于混合物的局部饱和温度。该假设使得能够定量表示垂直方向和径向方向上的浓度分布。基于推导出的饱和温度和混合物组成的局部值来评估混合物的表面张力的变化。发现在加热表面附近，表面张力沿加热表面的方向急剧增加，这表明在加热表面附近的液/气界面处引起了强烈的马兰戈尼对流。

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