@Article{hmt.18.2,
AUTHOR = {Amnart Boonloi, Withada Jedsadaratanachai},
TITLE = {HEAT TRANSFER AND FLOW PROFILES IN ROUND TUBE HEAT  EXCHANGER EQUIPPED WITH VARIOUS V-RINGS},
JOURNAL = {Frontiers in Heat and Mass Transfer},
VOLUME = {18},
YEAR = {2022},
NUMBER = {1},
PAGES = {1--13},
URL = {http://www.techscience.com/fhmt/v18n1/52433},
ISSN = {2151-8629},
ABSTRACT = {This study numerically investigates pressure loss, heat transfer and thermal efficiency in round tube heat exchangers attached with various types of Vrings. A typical type A V-ring is compared with two types of 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 in the turbulent region are discussed (Re = 3000 – 20,000). Flow directions in the round pipe attached with the V-rings
are varied. The V-apex setting downstream is referred to as “V-Downstream, while the V-apex setting upstream is referred to as “V-Upstream”. The 
flow and heat transfer profiles in the tested section are analyzed using the finite volume method (a commercial code with the SIMPLE algorithm). The 
thermal performance of the tested tube is measured in terms of dimensionless variables: thermal enhancement factor (TEF), Nusselt number (Nu) and 
friction factor (f). Numerical results reveal that type B and C V-rings can reduce pressure drop compared with type A V-ring. Additionally, the VUpstream of type C V-ring yields the maximum TEF of 3.10 at b/D = 0.05.},
DOI = {10.5098/hmt.18.2}
}