The flow and heat transfer performances of three trisection helical baffle heat exchangers with different baffle shapes and assembly configurations, and a continuous helical baffle scheme with approximate spiral pitch were numerically simulated. The four schemes are two trisection helical baffle schemes of baffle incline angle of 20° with a circumferential overlap baffle scheme (20°TCO) and a end-to-end helical baffle scheme (20°TEE), a trisection mid-overlap helical baffle scheme with baffle incline angle of 36.2° (36.2°TMO), and a continuous helical baffle scheme with baffle helix angle of 16.8° (18.4°CH). The pressure or velocity nephograms with superimposed velocity vectors for meridian slice M1, transverse slices f and f1, and unfolded concentric hexagonal slices H2 and H3 are presented. The Dean vortex secondary flow field, which is one of the key mechanisms of enhancing heat transfer in heat exchangers, is clearly depicted showing a single vortex is formed in each baffle pitch cycle. The leakage patterns are demonstrated clearly on the unfolded concentric hexagonal slices. The results show that the 20°TCO and 18.4°CH schemes rank the first and second in shell-side heat transfer coefficient and comprehensive indexes ho/Δpo and ho/Δpo1/3. The 20°TEE scheme without circumferential overlap is considerably inferior to the 20°TCO scheme. The 36.2°TMO scheme is the worst in both shell-side heat transfer coefficient and comprehensive index ho/Δpo1/3.
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ASME 2013 International Mechanical Engineering Congress and Exposition
November 15–21, 2013
San Diego, California, USA
Conference Sponsors:
- ASME
ISBN:
978-0-7918-5635-2
PROCEEDINGS PAPER
Shell Side Flow and Heat Transfer Performances of Trisection Helical Baffle Heat Exchangers
Yaping Chen,
Yaping Chen
Southeast University, Nanjing, China
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Jiafeng Wu
Jiafeng Wu
Southeast University, Nanjing, China
Search for other works by this author on:
Yaping Chen
Southeast University, Nanjing, China
Cong Dong
Southeast University, Nanjing, China
Jiafeng Wu
Southeast University, Nanjing, China
Paper No:
IMECE2013-65697, V08BT09A052; 6 pages
Published Online:
April 2, 2014
Citation
Chen, Y, Dong, C, & Wu, J. "Shell Side Flow and Heat Transfer Performances of Trisection Helical Baffle Heat Exchangers." Proceedings of the ASME 2013 International Mechanical Engineering Congress and Exposition. Volume 8B: Heat Transfer and Thermal Engineering. San Diego, California, USA. November 15–21, 2013. V08BT09A052. ASME. https://doi.org/10.1115/IMECE2013-65697
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