A study of turbulent heat transfer in a sudden-expansion pipe with drag-reducing viscoelastic fluid

The turbulent heat transfer behavior of a drag-reducing viscoelastic fluid is experimentally investigated in a sudden-expansion circular pipe with aqueous solutions of polyacrylamide. When the average Nusselt number is compared with and without the sudden-expansion step, the percentage heat transfer...

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Bibliographic Details
Published in:International journal of heat and mass transfer 1991, Vol.34 (4-5), p.1195-1208
Main Authors: PAK, B, CHO, Y. I, CHOI, S. U. S
Format: Article
Language:English
Subjects:
Exact sciences and technology
Flows in ducts, channels, nozzles, and conduits
Fluid dynamics
Fundamental areas of phenomenology (including applications)
Physics
pipes
thermal expansion
turbulent flow
viscoelasticity
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Summary:The turbulent heat transfer behavior of a drag-reducing viscoelastic fluid is experimentally investigated in a sudden-expansion circular pipe with aqueous solutions of polyacrylamide. When the average Nusselt number is compared with and without the sudden-expansion step, the percentage heat transfer enhancement due to the sudden-expansion step for the polyacrylamide solutions is 40-63%, depending on the Reynolds number, while that for water is 3-6%. The current results suggest that many energy-intensive industries that process huge amounts of viscoelastic fluids through various types of heat exchangers can capitalize upon heat transfer performance enhanced by the sudden-expansion step.
ISSN:0017-9310
1879-2189
DOI:10.1016/0017-9310(91)90028-D