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Thermal performance augmentation in heat exchanger tube with ovalpentagon rings |
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| รหัสดีโอไอ | |
| Creator | 1. W. CHINGTUAYTHONG 2. S. CHOKPHOEMPHUN |
| Title | Thermal performance augmentation in heat exchanger tube with ovalpentagon rings |
| Publisher | Thai Society of Mechanical Engineers (TSME) |
| Publication Year | 2561 |
| Journal Title | Journal of Research and Applications in Mechanical Engineering (JRAME) |
| Journal Vol. | 6 |
| Journal No. | 1 |
| Page no. | 50-62 |
| Keyword | Thermal performance, vortex ring, flow behavior, heat tranfer, Reynolds number |
| URL Website | https://tci-thaijo.org/index.php/jrame/index |
| Website title | Journal of Research and Applications in Mechanical Engineering (JRAME) |
| ISSN | 2229-2152 |
| Abstract | The paper presents an experimental and numerical investigation on thermal performance in a uniform wall heat-fluxed tube inserted with 45? inclined ovalpentagon rings (OPR) for turbulent flow region using air as the working fluid. The ring parameters included three blockage ratios (RB=e/D=0.05, 0.10 and 0.15) and four pitch ratios (RP=P/D=1.0, 1.25, 1.5 and 2.0) are introduced. The results from the inserted tube are compared with those from smooth tube alone and show that the OPR can augment the heat transfer rate and friction loss around 2.254.86 and 14100 times over the smooth tube, respectively, depending upon operating conditions. The maximum thermal enhancement factor for using OPR tabulators at about 1.36 is for Re=3900, RB=0.05 and RP=1.0. It is worth noting that the results of numerical study are in good agreement with the experimental ones. The average deviation of both results is within ?7% for Nusselt number and ?10% for friction factor. |
