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论文类型：期刊论文

发表时间：2010-02-01

发表刊物：12th Asia-Pacific-Confederation-of-Chemical-Engineering (APCChE 2008)

收录刊物：SCIE、EI、CPCI-S、Scopus

卷号：156

期号：3

页面范围：607-612

ISSN号：1385-8947

关键字：Falling film absorption; Heat and mass transfer; Numerical simulation

摘要：Falling liquid film is commonly employed in variety of industrial systems, such as LiBr/H(2)O absorption heat pump or chiller. In this paper, the falling film absorption in aqueous lithium bromide solution was investigated numerically using CFD software package-Fluent. The practical convective boundary condition at the cooling water side was considered. The heat transfer coefficient is assumed constant, and the coolant temperature changes linearly along its flow path. The numerical results indicate that the profile of temperature is exponential and their gradients are high due to the distinct heat effect associated with the absorption at the interface and the cooling effect of coolant at the wall at small downstream distance. As the downstream distance increases, the profile of temperature is nearly linear. The absorption heat and mass fluxes reach a maximum at the inlet region and decrease at the outside of the inlet region. Specially, the effect of variable physical properties on the absorption process was considered and discussed. The prediction of the total absorption mass transfer rate is about 6.5% higher when assuming constant properties. (C) 2009 Elsevier B.V. All rights reserved.