Thianpong, Chinaruk
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Preferred name
Thianpong, Chinaruk
Alternative Name
Thianpong, C.
Main Affiliation
Email
chinaruk.th@kmitl.ac.th
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Item type:Publication, Heat transfer enhancement in a tube using delta-winglet twisted tape inserts(2010-03-01) - Some of the metrics are blocked by yourconsent settings
Item type:Publication, Turbulent heat transfer enhancement by counter/co-swirling flow in a tube fitted with twin twisted tapes(2010-01-01); Eiamsa-ard, P.In the present study, the influences of twin-counter/co-twisted tapes (counter/co-swirl tape) on heat transfer rate (Nu), friction factor (f) and thermal enhancement index (η) are experimentally determined. The twin counter twisted tapes (CTs) are used as counter-swirl flow generators while twin co-twisted tapes (CoTs) are used as co-swirl flow generators in a test section. The tests are conducted using the CTs and CoTs with four different twist ratios (y/w = 2.5, 3.0, 3.5 and 4.0) for Reynolds numbers range between 3700 and 21,000 under uniform heat flux conditions. The experiments using the single twisted tape (ST) are also performed under similar operation test conditions, for comparison. The experimental results demonstrate that Nusselt number (Nu), friction factor (f) and thermal enhancement index (η) increase with decreasing twist ratio (y/w). The results also show that the CTs are more efficient than the CoTs for heat transfer enhancement. In the range of the present work, heat transfer rates in the tube fitted with the CTs are around 12.5-44.5% and 17.8-50% higher than those with the CoTs and ST, respectively. The maximum thermal enhancement indices (η) obtained at the constant pumping power by the CTs with y/w = 2.5, 3.0, 3.5 and 4.0, are 1.39, 1.24, 1.12 and 1.03, respectively, while those obtained by using the CoTs with the same range of y/w are 1.1, 1.03, 0.97 and 0.92, respectively. In addition, the empirical correlations of the heat transfer (Nu), friction factor (f) and thermal enhancement index (η) are also reported. © 2009 Elsevier Inc. All rights reserved. - Some of the metrics are blocked by yourconsent settings
Item type:Publication, Heat transfer enhancement by helically twisted tapes inducing co- and counter-swirl flows(2013-08-01); Eiamsa-ard, S.An experimental investigation has been conducted for determining heat transfer enhancement by inserting helically twisted tapes, to induce co- and counter-swirl flows, (the tapes are symbolized as co-HTT and C-HTT, respectively). Tape pitch ratio (p/ D) was varied between 1.0 and 2.0, while tape width ratio (w/D) and twist ratio (y/w) were fixed at 0.2 and 3.0, respectively. The experiments were performed for fully developed turbulent flow with Reynolds number range (Re) between 6000 and 20,000, under uniform wall heat flux condition. At similar conditions, the use of Co-HTT results in lower Nusselt number and friction factor but higher thermal performance factor than that of C-HTT. Nusselt number and friction factor increase with decreasing pitch ratio, while thermal performance factor possesses opposite trend. In addition, the empirical correlations for Nusselt number, friction factor and thermal performance factor as functions of the Reynolds number (Re), Prandtl number (Pr) and tape pitch (p/D), were developed through a multi-variant linear normal regression. © 2013 Elsevier Ltd.