Open AccessNumerical study on the influencing mechanism of twisted ratio in outward convex corrugated tubes with a twisted tape insert
Author(s) -
Huaizhi Han,
Longbin Yang,
Yiran Hu,
Ruitian Yu,
Qun Zhang
Publication year - 2018
Publication title -
thermal science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.339
H-Index - 43
eISSN - 2334-7163
pISSN - 0354-9836
DOI - 10.2298/tsci170614042h
Subject(s) - tube (container) , insert (composites) , twist , nusselt number , materials science , aspect ratio (aeronautics) , regular polygon , heat transfer , heat transfer enhancement , enhanced heat transfer , composite material , diameter ratio , mechanics , thermodynamics , physics , heat transfer coefficient , geometry , mathematics , turbulence , reynolds number
Nu mer i cal in ves ti ga tions were con ducted on flow and heat trans fer in an out ward con vex cor ru gated tube with var i ous struc tural twisted tape in serts. The study in ves ti gated the in flu ence of twisted ra tio on ther mo dy namic reg u la tion and mech a nism in the cor ru gated tube. The re sults in di cate that Nusselt num ber in the cor ru gated tube (Nuc) ex ceeds those in the cor ru gated tube and smooth tube by 120-136% and 171-317%, re spec tively. Mean while, the fric tion fac tor in creases by 148-153% and 476-514%, re spec tively. The best over all ther mal per for mance (h = 1.97) is ob tained with a high twist ra tio (y/w = 5). How ever, the high est ther mal per for mance (Nuc/Nus = 4.78) is ob tained with the low est twist ra tio (y/w = 1.25).
Accelerating Research
Robert Robinson Avenue,
Oxford Science Park, Oxford
OX4 4GP, United Kingdom
Address
John Eccles HouseRobert Robinson Avenue,
Oxford Science Park, Oxford
OX4 4GP, United Kingdom