Condensation Heat Transfer and Flow Properties of R134a Refrigerant in Rectangular Minichannel: A Numerical Study-Reference-Cited by-同舟云学术

Condensation Heat Transfer and Flow Properties of R134a Refrigerant in Rectangular Minichannel: A Numerical Study

Published:2019-09-04 Issue:2 Volume:12 Page:
ISSN:1948-5085
Container-title:Journal of Thermal Science and Engineering Applications
language:en
Short-container-title:

Author:

Li Wei¹,Lyu Di¹,Zhang Jingzhi²,Sherif S. A.³

Affiliation:

1. Department of Energy Engineering, Zhejiang University, 38 Zheda Road, Hangzhou 310027, China

2. School of Energy and Power Engineering, Shandong University, Jinan, Shandong 250061, China

3. Department of Mechanical and Aerospace Engineering, University of Florida, Gainesville, FL 32611

Abstract

Abstract This study numerically investigated the condensation heat transfer and flow characteristics of refrigerant R134a in a rectangular minichannel. Three-dimensional simulations were carried out at different mass fluxes, vapor qualities, and gravity conditions using the volume-of-fluid (VOF) model, a turbulence model, and a phase transition model. The effects of various parameters on the surface heat transfer coefficient and the frictional pressure gradient are investigated. The condensation process was found to be enhanced due to the increase of vapor quality and mass flow rate, while the frictional pressure gradient was found to decrease with the decrease of vapor quality and mass flow rate. Simulation results revealed that the liquid film tends to accumulate along the corner of the cross section of the minichannel. Furthermore, the thickness of the liquid film was found to increase with the decrease of mass flux and vapor quality.

Funder

National Science Foundation

Publisher

ASME International

Subject

Fluid Flow and Transfer Processes,General Engineering,Condensed Matter Physics,General Materials Science

Link

http://asmedigitalcollection.asme.org/thermalscienceapplication/article-pdf/doi/10.1115/1.4044168/5172775/tsea-19-1168.pdf

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