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HEAT TRANSFER AND FLOW PROFILES IN THE ROUND TUBE HEAT EXCHANGER EQUIPPED WITH VARIOUS V-RINGS

Amnart Boonloi, Withada Jedsadaratanachai
Frontiers in Heat and Mass Transfer (FHMT) 18 - 2 (2022)


Abstract


Pressure loss, heat transfer and thermal efficiency assessments in the round tube heat exchanger attached with various V-rings are numerically investigated. The general shape of the V-ring (type A) is compared with the modified V-rings (type B and C). The impacts of blockage ratios, b/D = 0.05, 0.10, 0.15 and 0.20 for all V-ring types are discussed for turbulent region, Re = 3000 – 20,000. The flow directions in the round pipe attached with the V-rings are varied; the V-apex setting downstream is called “V-Downstream, while the V-apex setting upstream is named “V-Upstream”. The flow and heat transfer profiles in the tested section are analyzed with the finite volume method (a commercial code with SIMPLE algorithm). The thermal performance of the tested tube is plotted in terms of dimensionless variables, thermal enhancement factor (TEF), Nusselt number (Nu) and friction factor (f). The numerical results reveal that the type B and C V-rings assist to relieve the pressure drop when compared with the type A V-ring. Additionally, the maximum thermal enhancement factor is found to be about 3.10 at b/D = 0.05, V-Upstream of the type C V-ring.  


Full Text: PDF
DOI: http://dx.doi.org/10.5098/hmt.18.2

ISSN: 2151-8629