Conjugated shear stress and Prandtl number effects on reflux condensation heat transfer inside a vertical tube

被引：18

作者：

Gross, U ^{[1
]}

Philipp, C ^{[1
]}

机构：

[1] Tech Univ, Bergakad Freiberg, Inst Warmtech & Thermodynam, D-09599 Freiburg, Germany

来源：

INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER | 2006年 / 49卷 / 1-2期

关键词：

heat transfer; reflux condensation; falling film; experiment; vertical tube; shear stress effect;

D O I：

10.1016/j.ijheatmasstransfer.2005.07.030

中图分类号：

O414.1 [热力学];

学科分类号：

摘要：

Local reflux condensation heat transfer coefficients have been measured inside a vertical tube with water (2.6 < Pr-liq < 4.5), ethanol (12.4 < Pr-liq < 18.4) and isopropanol (23 < Pr-liq < 55) as the test fluids. A counter current flow situation is established with the liquid film (0.68 < Re-film < 2000) and the vapour (1000 < Re-vap < 16,500) flowing downward and upward, respectively. The heat transfer has found to be impeded by the shear stress only in cases of a very thin film, i.e. in the smooth laminar range, and it can well be correlated by a simple analytical model. In the larninar-wavy range including developing turbulence the heat transfer coefficients are found to increase with the shear stress, an effect which proved to be enhanced with rising Pr-liq numbers. This has been correlated with very good agreement. (c) 2005 Elsevier Ltd. All rights reserved.

引用

页码：144 / 153

页数：10

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