Thianpong, Chinaruk
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Preferred name
Thianpong, Chinaruk
Alternative Name
Thianpong, C.
Main Affiliation
Email
chinaruk.th@kmitl.ac.th
19 results
Now showing 1 - 10 of 19
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Item type:Publication, Heat transfer enhancement in a rectangular channel with twisted tape inserts(2009-01-01) - Some of the metrics are blocked by yourconsent settings
Item type:Publication, Numerical heat transfer study of square duct equipped with novel flapped V-baffles(2024-03-01); ; - Some of the metrics are blocked by yourconsent settings
Item type:Publication, Thermal characterization in a circular tube fitted with inclined horseshoe baffles(2015-01-22); ; In the present study, the influence of inclined horseshoes baffles placed repeatedly in a tubular heat exchanger on heat transfer rate, friction factor and thermal enhancement factor are experimentally determined. The horseshoe baffle elements with an inclination angle of 20° were inserted periodically into the test tube at three different baffle-pitch ratios (P<inf>R</inf> = 0.5, 1.0 and 2) and -width or blockage ratios (B<inf>R</inf> = 0.1, 0.15 and 0.2). The experiment was conducted in the test tube having a uniform heat-fluxed wall by varying turbulent airflow to obtain Reynolds number in a range of 5300-24,000. The experimental results revealed that the tube fitted with inclined horseshoes baffles provides considerable improvement of the heat transfer rate over the plain tube around 92-208% while the friction factor is increased at about 1.76-6.37 times. To access the real benefits for the inclined horseshoes baffles inserted in plain tube, thermal performance factor is examined and found to be in the range of 1.34-1.92 at which the maximum obtained at P<inf>R</inf> = 0.5 and B<inf>R</inf> = 0.1 is considerably higher than that for published inserted devices. Correlations for Nusselt number and friction factor for the oblique horseshoe-baffled tube are also proposed. - Some of the metrics are blocked by yourconsent settings
Item type:Publication, Compound heat transfer enhancement of a dimpled tube with a twisted tape swirl generator(2009-08-01); - Some of the metrics are blocked by yourconsent settings
Item type:Publication, Turbulent flow heat transfer and pressure loss in a double pipe heat exchanger with louvered strip inserts(2008-02-01); In the present work, heat transfer and friction characteristics were experimentally investigated, employing louvered strips inserted in a concentric tube heat exchanger. The louvered strip was inserted into the tube to generate turbulent flow which helped to increase the heat transfer rate of the tube. The flow rate of the tube was in a range of Reynolds number between 6000 and 42,000. The turbulent flow devices were consisted of (1) the louvered strips with forward or backward arrangements, and (2) the louvered strip with various inclined angles (θ = 15°, 25° and 30°), inserted in the inner tube of the heat exchanger. In the experiment, hot water was flowed through the inner tube whereas cold water was flowed in the annulus. The experimental data obtained were compared with those from plain tubes of published data. Experimental results confirmed that the use of louvered strips leads to a higher heat transfer rate over the plain tube. The increases in average Nusselt number and friction loss for the inclined forward louvered strip were 284% and 413% while those for the backward louvered strip were 263% and 233% over the plain tube, respectively. In addition, the use of the louvered strip with backward arrangement leads to better overall enhancement ratio than that with forward arrangement around 9% to 24%. © 2007 Elsevier Ltd. All rights reserved. - Some of the metrics are blocked by yourconsent settings
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 augmentation in a helical-ribbed tube with double twisted tape inserts(2012-08-01); ; Turbulent convective heat transfer characteristics in a helical-ribbed tube fitted with twin twisted tapes have been investigated experimentally. The experiment was carried out in a double tube heat exchanger using the helical-ribbed tube having a single rib-height to tube-diameter ratio, e/D <inf>H</inf>=0.06 and rib-pitch to diameter ratio, P/D <inf>H</inf>=0.27 as the tested section. The insertion of the double twisted tapes with twist ratio, Y, in the range of 2.17 to 9.39 is to create vortex flows inside the tube. The inserted ribbed tube is arranged in similar directions of the helical swirl of the twisted tape and the helical rib motion of the tube (called co-swirl). Effects of the co-swirl motion of the ribbed tube and the double twisted tapes with various twist ratios on heat transfer and friction characteristics are examined. The results obtained from the ribbed tube and the twin twisted tape insert are compared with those from the smooth tube and the ribbed tube acting alone. The experimental results reveal that the co-swirling inserted tube performs much better than the ribbed/smooth tube alone at a similar operating condition. The co-swirl tube at Y≈8 yields the highest thermal performance at lower Reynolds number (Re). In addition, the correlations of Nusselt number and friction factor as functions of Re, Pr and Y are also proposed. © 2012 Elsevier Ltd. - Some of the metrics are blocked by yourconsent settings
Item type:Publication, Thermal characteristics in a heat exchanger tube fitted with dual twisted tape elements in tandem(2010-01-01); - Some of the metrics are blocked by yourconsent settings
Item type:Publication, Evaluation of aerothermal performance of a round tube with regularly-spaced multi-channel twisted tape elements installed(2024-06-01); ;