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Experimental investigation of thermal performance enhancement in tubular heat exchanger fitted with rectangular-winglet-tape vortex generator |
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| รหัสดีโอไอ | |
| Creator | 1. Chotiwut Prasopsuk 2. Panuwat Hoonpong 3. Sompol Skullong 4. Pongjet Promvonge |
| Title | Experimental investigation of thermal performance enhancement in tubular heat exchanger fitted with rectangular-winglet-tape vortex generator |
| Publisher | Faculty of Engineering, Khon Kaen University |
| Publication Year | 2559 |
| Journal Title | KKU Engineering Journal |
| Journal Vol. | 43 |
| Journal No. | S2 |
| Page no. | 279-282 |
| Keyword | Heat exchanger, Heat transfer, Rectangular winglet tape, Thermal performance, Vortex generator |
| ISSN | 0125-8273 |
| Abstract | The article presents an experimental study on thermal characteristics in a constant heat-fluxed circular tube fitted with rectangular-winglet tape (RWT) vortex generators. Air was employed as the working fluid based on Reynolds numbers (Re) in the turbulent regime between 4100 and 26,000. The effect of the RWT insert on heat transfer rate and friction loss was experimentally investigated. The RWT parametric study includes five winglet-to-tube height ratios or blockage ratios (b/D=BR= 0.15, 0.2, 0.25 and 0.3) at a single winglet inclination angle (q = 45?) and a pitch ratio (P/D=PR=2). The experimental results show that the heat transfer and friction loss for the RWT insert increase with the increment of BR. The Nu for the inserted tube was approximately 3.74.3 times higher than that for the smooth tube, while the f was approximately 19.445 times greater. For the studied BR ranges, the highest thermal enhancement factor (h) of 1.46 is obtained for BR = 0.2 at lower Re. |
