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The Second China Energy Scientist Forum (CESF 2010 E-BOOK)

Xuzhou,China,10.18-10.19，2010

ISBN: 978-1-935068-37-2 Scientific Research Publishing, USA

E-Book 2244pp Pub. Date: October 2010

Category: Medicine & Healthcare

Price: $360

Title: Marangoni Condensation Enhancement Mechanism
Source: The Second China Energy Scientist Forum (CESF 2010 E-BOOK) (pp 1914-1917)
Author(s): Shenhua Hu, Department of Thermal Power of Electrical Engineering College, Xinjiang University, Urumqi, China
Junjie Yan, School of Energy and Power Engineering, Xi’an Jiaotong University, Xi’an, China
Abstract: This paper reported on the rates of condensation heat transfer for water-ethanol mixtures in an oblique block under a wide range of concentrations. Temperature difference along condensing surface resulting from shape of the oblique block would create surface tension difference and affect Marangoni condensation. It was shown that for ethanol concentrations in the concentration 1 wt% the mean condensation heat transfer was enhanced by up to 15% by comparing experimental results with literature under similar experimental condition. Furthermore, the effect arising from temperature difference was more obvious for low concentrations in low vapour-surface temperature difference (<10K). This enhancement was caused by the two motions which produced a disturbed condensate film and a corresponding drop in the thermal resistance of the condensate film. Moreover, the mean heat transfer coefficient generally increased with increasing pressure for all concentration of the water-ethanol mixtures.
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