Evaporation heat transfer of falling water film on a horizontal tube bundle

✍ Scribed by Zhen-Hua Liu; Qun-Zhi Zhu; Yu-Ming Chen

• Publisher: John Wiley and Sons
• Year: 2002
• Tongue: English
• Weight: 158 KB
• Volume: 31
• Category: Article
• ISSN: 1099-2871
• DOI: 10.1002/htj.10016

✦ Synopsis

Abstract

A numerical simulation and experimental study were carried out for evaporation heat transfer of a falling water film on a smooth horizontal tube bundle evaporator. A laminar model and a turbulence model were respectively adopted to calculate the heat transfer coefficients of falling water film on horizontal heated tubes. The calculation zone on the heated tube was divided into the top stagnation zone and the lateral free film zone. The initial boundary conditions for the free film zone were determined from the calculated results of the stagnation zone. The modified wall function method was used for the turbulent flow. Comparisons between the experimental data and the numerical solutions by use of two flow models show that the experimental data lie between the laminar model solutions and the latter turbulence model solutions and that they are closer to the latter solutions. Finally, a simple dimensionless correction based on the numerical simulations is proposed for predicting the evaporation heat transfer of falling water film for actual engineering applications. © 2001 Scripta Technica, Heat Trans Asian Res, 31(1): 42–55, 2002