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Performance Comparison of Trisection Helical Baffle Heat Exchangers with Different Circumferential Overlap Sizes
Author(s) -
Dong Cong,
Chen YaPing,
Wu JiaFeng
Publication year - 2015
Publication title -
chemical engineering and technology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.403
H-Index - 81
eISSN - 1521-4125
pISSN - 0930-7516
DOI - 10.1002/ceat.201300499
Subject(s) - baffle , heat exchanger , nusselt number , row , mechanics , flow (mathematics) , materials science , engineering drawing , reynolds number , thermodynamics , physics , engineering , computer science , turbulence , database
The circumferential overlap structure is considered as one of the key factors which influence the performances of helical baffle heat exchangers by restraining the bypass stream between adjacent baffles. The flow and thermal performances of four trisection helical baffle heat exchangers with the same angle of inclination but different circumferential overlap sizes were numerically investigated. The four schemes involve an end‐to‐end one and three circumferential overlap ones with triangular area covering one row (20°TCO), two rows (20°T2CO), and three rows (20°T3CO) of tubes. The flow field and combined slices with pressure contours plus velocity vectors were depicted. The 20°TCO scheme proved to be superior to other schemes since its Nusselt number as well as its comprehensive index are the highest and its secondary flow is the strongest.