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Heat Transfer Research
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ISSN Печать: 1064-2285
ISSN Онлайн: 2162-6561

Выпуски:
Том 50, 2019 Том 49, 2018 Том 48, 2017 Том 47, 2016 Том 46, 2015 Том 45, 2014 Том 44, 2013 Том 43, 2012 Том 42, 2011 Том 41, 2010 Том 40, 2009 Том 39, 2008 Том 38, 2007 Том 37, 2006 Том 36, 2005 Том 35, 2004 Том 34, 2003 Том 33, 2002 Том 32, 2001 Том 31, 2000 Том 30, 1999 Том 29, 1998 Том 28, 1997

Heat Transfer Research

DOI: 10.1615/HeatTransRes.2016014354
pages 347-359

STUDY ON HEAT TRANSFER PERFORMANCES OF CIRCUMFERENTIAL OVERLAP TRISECTION HELICAL BAFFLE HEAT EXCHANGERS

Wei-Han Wang
College of Urban Construction and Safety Engineering, Shanghai Institute of Technology, Shanghai 201418, China
Dao-Lai Cheng
College of Urban Construction and Safety Engineering, Shanghai Institute of Technology, Shanghai 201418, China
Tao Liu
Baoshan Iron & Steel CO., LTD, Shanghai 201900, China
Ya-Ping Chen
School of Energy and Environment, Southeast University, Nanjing 210096, China

Краткое описание

The circumferential overlap trisection helical baffle shell-and-tube heat exchangers are suitable for equilateral triangular lay-out of tubes and can dampen shortcut leakage in triangular zones of adjacent baffles. The performance tests were conducted on oil-water heat transfer in circumferential overlap trisection helical baffle heat exchangers with inclination angles of 12°, 16°, 20°, 24°, and 28°, and compared with a segmental baffle heat exchanger. The results show that both the shell-side heat transfer coefficient h0 and pressure drop Δp0 increase while the comprehensive index h0p0 decreases with increase in the mass flow rate of all schemes. The shell-side heat transfer coefficient, pressure drop, and the comprehensive index h0p0 decrease with increase in the baffle inclination angle at a certain mass flow rate. The average values of the shell-side heat transfer coefficient and the comprehensive index h0p0 of the 12° helical baffle scheme are above 50% higher than those of the segmental one correspondingly, while the pressure drop is approximate and the ratios of the average values are about 1.664 and 1.596, respectively. The shell-side Nusselt number Nu0 and the comprehensive index Nu0·Euz0-1 increase with the Reynolds number of the shell-side axial Reynolds number Rez0 in all schemes. The correlation equations for the shell-side Nusselt number and axial Euler number are presented varying with the axial Reynolds number, Prandtl number, and with the helical baffle inclination angle; the deviations are within ±10%.


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