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首页> 外文期刊>International Journal of Multiphase Flow >Effect of temperature gradient on Marangoni condensation heat transfer for ethanol-water mixtures
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Effect of temperature gradient on Marangoni condensation heat transfer for ethanol-water mixtures

机译：温度梯度对Marangoni乙醇水混合物凝结传热的影响

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This paper experimentally studied the effect of macroscopic temperature gradient on Marangoni condensation of ethanol-water vapor mixtures under a wide range of concentrations. For each concentration, the experiment was performed at different velocities and pressures. An oblique copper block was employed to create surface temperature gradient. The results indicated that local heat flux was varied along transversal condensation surface, which was caused by surface temperature gradient. This difference in heat flux might be attributed to the variation of condensate thickness on condensation surface. In addition, a mean heat transfer coefficient was derived along transversal condensation surface. For low ethanol concentration (0.5%, 1%), the coefficient kept a high value over a relative wide range of vapor-to-surface temperature difference (<10 K) and could be augmented as much as 15% as compared with literature under similar experimental condition. Moreover, the mean heat transfer coefficient generally increased with increasing velocity or pressure for all concentrations of the ethanol-water mixtures. (C) 2007 Elsevier Ltd. All rights reserved.
机译：本文通过实验研究了宏观温度梯度对宽浓度范围内乙醇-水蒸气混合物的Marangoni缩合的影响。对于每种浓度，以不同的速度和压力进行实验。使用倾斜的铜块产生表面温度梯度。结果表明，局部热通量沿横向凝结面变化是由于表面温度梯度引起的。热通量的这种差异可能归因于冷凝表面上冷凝物厚度的变化。另外，沿横向冷凝面导出平均传热系数。对于低乙醇浓度（0.5％，1％），该系数在相对较大的蒸气与表面温差范围（<10 K）内保持较高的值，并且与以下文献中的文献相比可增加多达15％类似的实验条件。此外，对于所有浓度的乙醇-水混合物，平均传热系数通常随着速度或压力的增加而增加。 （C）2007 Elsevier Ltd.保留所有权利。

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