The Peak Boiling Heat Flux in Saturated Ethanol-Water Mixtures
The Peak Boiling Heat Flux in Saturated Ethanol-Water Mixtures
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DOI：
10.1115/1.3250702
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发表时间：
1989-05
影响因子：
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通讯作者：
R. Reddy;Graduate Student;Mem. Asme;J. Lienhard;Asme Fellow
中科院分区：
文献类型：
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作者：
R. Reddy;Graduate Student;Mem. Asme;J. Lienhard;Asme Fellow
目前的工作提供了饱和乙醇-水混合物在整个浓度范围内的燃尽热通量的原始测量。这些数据是在大气压下在直径为0.51至2.16毫米的水平圆柱体上获得的。它们揭示了混合物的峰值热通量比具有混合物性质的纯流体的峰值热通量有显著改善。这种改善在低乙醇质量分数时最为明显。McEligot认为，热流密度的提高是由液体-蒸汽界面上选择性蒸馏产生的过冷造成的。将这一想法与最近的过冷燃尽的相关性相结合，我们定性地估计了有效过冷的程度，并讨论了使用这一估计来关联二元混合物中的燃尽。基于相平衡图的适当表征，提出了两个无量纲群来表征这种有效过冷。
The present work provides original measurements of the burnout heat flux in saturated ethanol-water mixtures, over the full range of concentrations. These data were obtained at atmospheric pressure on horizontal cylinders, ranging from 0.51 to 2.16 mm in diameter. They reveal significant improvements of the peak heat flux for mixtures, over that which would be expected from pure fluids with the properties of the mixture. This improvement is most pronounced at low ethanol mass fractions. McEligot has suggested that the improved heat flux results from a subcooling created by selective distillation at the liquid-vapor interface. Combining this idea with a recent correlation of subcooled burnout, we estimate the extent of effective subcooling qualitatively and discuss the use of this estimate to correlate burnout in binary mixtures. Two dimensionless groups are proposed to characterize this effec tive subcooling, both based on appropriate characterizations of the phase equilibrium diagram.