CIESC Journal ›› 2016, Vol. 67 ›› Issue (S1): 232-238.doi: 10.11949/j.issn.0438-1157.20160215

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Numerical simulation of multi-flow and heat transfer characteristics in heat exchangers with triple-helical baffles

DUAN Zhenya, SHEN Feng, ZHANG Junmei, SONG Xiaomin, CAO Xing   

  1. College of Electromechanical Engineering, Qingdao University of Science and Technology, Qingdao 266000, Shandong, China
  • Received:2016-02-29 Revised:2016-03-15 Online:2016-08-31 Published:2016-08-31
  • Supported by:

    supported by the Shandong Province Taishan Scholar Engineering under Special Funding and the Science and Technology Planning Project of Shandong Provincial Education Department (J12LD15).

Abstract:

Triple helical baffle heat exchanger was proposed to arrange more helical baffle in shell side with large helix angle and enhance heat transfer rate. In this paper, the flow characteristics and heat transfer performance of heat exchangers with triple helical baffles were analyzed. The comprehensive performance between single-helical and triple-helical baffle heat exchangers were compared based on the calculating results of pressure drop and heat transfer coefficient when Reynolds number ranges from 1391-4174. The results showed that:heat transfer coefficient and JF factor of triple-helical baffle heat exchangers is 27.9% higher and 13.67% higher than single-helical baffle heat exchanger respectively. Besides entransy dissipation theory was used to analyze the heat transfer performance of triple-helical baffle heat exchanger with different helix angle, and triple-helical baffle with 64.8° got the lowest entransy dissipation rate. The heat transfer rate of central tube and outer tube were compared, outer tube have higher heat transfer rate compared with central tube.

Key words: continuous helical baffles, heat exchanger, triple-helical, entransy dissipation, numerical simulation

CLC Number: 

  • TK124
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