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Flow and Heat Transfer Characteristics of a Helically Coiled Heat Exchanger Using Different Turbulence Models

DOI: 10.1615/ICHMT.2012.ProcSevIntSympTurbHeatTransfPal.2390
pages 2321-2332

Wei-Cheng Lin
Department of Engineering and System Science, National Tsing Hua University, Hsinchu, Taiwan 30043

Yuh-Ming Ferng
Institute of Nuclear Engineering and Science, National Tsing Hua University Hsinchu, Taiwan 30043, ROC

Ching-Chang Chieng
National Tsing Hua University Engineering and System Science Department Hsinchu city, Taiwan; Department of Mechanical and Biomedical Engineering, City University of Hong Kong, Kowloon, Hong Kong


This study investigates the thermal-hydraulic characteristics of helically coiled tube heat exchangers in high temperature gas reactors. In a heat exchanger, the high-temperature helium and low-temperature water flow through the shell side and the coiled tube, respectively. Three turbulence models are adopted in simulations: Realizable k−ε, low-Reynolds k−ε and Reynolds stress. Existing experimental data on the Nusselt (Nu) number validate the present CFD simulations using these turbulence models.

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