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Heat Transfer Research
Fator do impacto: 0.404 FI de cinco anos: 0.8 SJR: 0.264 SNIP: 0.504 CiteScore™: 0.88

ISSN Imprimir: 1064-2285
ISSN On-line: 2162-6561

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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

RESUMO

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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