Evaluation of thermal performance factor for solar air heaters with artificially roughened channels
Heat transfer augmentation has become the utmost industrial desire. Turbulence promoters seems to be a better option for better heat transfer but at the expense of enormous pressure drop. In the current study, experimental optimization of heat transfer and pressure drop in various configurations of...
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| Veröffentlicht in: | Archive of Mechanical Engineering 2021-01, Vol.68 (2), p.195-225 |
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| creator | Siddique, Waseem Raheem, Aneeq Aqeel, Muhammad Qayyum, Sualeh Salamen, Tareq Waheed, Khalid Qureshi, Kamran |
| description | Heat transfer augmentation has become the utmost industrial desire. Turbulence promoters seems to be a better option for better heat transfer but at the expense of enormous pressure drop. In the current study, experimental optimization of heat transfer and pressure drop in various configurations of ribbed and corrugated surfaces on the bottom wall of the Solar Air Heater channel, having aspect ratio of 26:5 was performed. The results were evaluated in terms of enhancement in heat transfer (Nu/Nu s), friction factor ratio (f/f s) and thermal performance factor ( η). Three different cases and nine configurations with a pitch to rib/corrugation height ratio of 4.0 were studied. Case A consists of a smooth, continuous square rib, inline and staggered broken ribs. Case B comprises 30°, 45°, 60° and 90° trapezoidal corrugated geometries while Case C is the comparison of smooth, wavy corrugated and the best configurations of cases A and B. The results show that rectangular duct with staggered broken ribs and trapezoidal corrugation at 45° are the best configurations for case A and B, respectively. The 45° corrugated configuration is the best one amongst all, with values of 1.53, 1.5 and 1.33% for Nu/Nu s, f/f s and η respectively. |
| doi_str_mv | 10.24425/ame.2021.137048 |
| format | Article |
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Turbulence promoters seems to be a better option for better heat transfer but at the expense of enormous pressure drop. In the current study, experimental optimization of heat transfer and pressure drop in various configurations of ribbed and corrugated surfaces on the bottom wall of the Solar Air Heater channel, having aspect ratio of 26:5 was performed. The results were evaluated in terms of enhancement in heat transfer (Nu/Nu s), friction factor ratio (f/f s) and thermal performance factor ( η). Three different cases and nine configurations with a pitch to rib/corrugation height ratio of 4.0 were studied. Case A consists of a smooth, continuous square rib, inline and staggered broken ribs. Case B comprises 30°, 45°, 60° and 90° trapezoidal corrugated geometries while Case C is the comparison of smooth, wavy corrugated and the best configurations of cases A and B. The results show that rectangular duct with staggered broken ribs and trapezoidal corrugation at 45° are the best configurations for case A and B, respectively. The 45° corrugated configuration is the best one amongst all, with values of 1.53, 1.5 and 1.33% for Nu/Nu s, f/f s and η respectively.</description><identifier>ISSN: 0004-0738</identifier><identifier>EISSN: 2300-1895</identifier><identifier>DOI: 10.24425/ame.2021.137048</identifier><language>eng</language><publisher>Warsaw: Polish Academy of Sciences</publisher><subject>Air heaters ; Aspect ratio ; Configurations ; Corrugation ; Friction factor ; Heat transfer ; heat transfer enhancement ; Optimization ; Performance evaluation ; Pressure drop ; solar air heater ; thermal performance factor ; turbulence promoters</subject><ispartof>Archive of Mechanical Engineering, 2021-01, Vol.68 (2), p.195-225</ispartof><rights>2021. This work is licensed under https://creativecommons.org/licenses/by-sa/4.0/ (the “License”). Notwithstanding the ProQuest Terms and Conditions, you may use this content in accordance with the terms of the License.</rights><lds50>peer_reviewed</lds50><oa>free_for_read</oa><woscitedreferencessubscribed>false</woscitedreferencessubscribed><citedby>FETCH-LOGICAL-c338t-d4f6cbef6d5048c6136068cd4a7f917ffd5d91d88956619357e788ebb1a81d523</citedby></display><links><openurl>$$Topenurl_article</openurl><openurlfulltext>$$Topenurlfull_article</openurlfulltext><thumbnail>$$Tsyndetics_thumb_exl</thumbnail><link.rule.ids>314,780,784,864,27924,27925</link.rule.ids></links><search><creatorcontrib>Siddique, Waseem</creatorcontrib><creatorcontrib>Raheem, Aneeq</creatorcontrib><creatorcontrib>Aqeel, Muhammad</creatorcontrib><creatorcontrib>Qayyum, Sualeh</creatorcontrib><creatorcontrib>Salamen, Tareq</creatorcontrib><creatorcontrib>Waheed, Khalid</creatorcontrib><creatorcontrib>Qureshi, Kamran</creatorcontrib><title>Evaluation of thermal performance factor for solar air heaters with artificially roughened channels</title><title>Archive of Mechanical Engineering</title><description>Heat transfer augmentation has become the utmost industrial desire. Turbulence promoters seems to be a better option for better heat transfer but at the expense of enormous pressure drop. In the current study, experimental optimization of heat transfer and pressure drop in various configurations of ribbed and corrugated surfaces on the bottom wall of the Solar Air Heater channel, having aspect ratio of 26:5 was performed. The results were evaluated in terms of enhancement in heat transfer (Nu/Nu s), friction factor ratio (f/f s) and thermal performance factor ( η). Three different cases and nine configurations with a pitch to rib/corrugation height ratio of 4.0 were studied. Case A consists of a smooth, continuous square rib, inline and staggered broken ribs. Case B comprises 30°, 45°, 60° and 90° trapezoidal corrugated geometries while Case C is the comparison of smooth, wavy corrugated and the best configurations of cases A and B. The results show that rectangular duct with staggered broken ribs and trapezoidal corrugation at 45° are the best configurations for case A and B, respectively. 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Turbulence promoters seems to be a better option for better heat transfer but at the expense of enormous pressure drop. In the current study, experimental optimization of heat transfer and pressure drop in various configurations of ribbed and corrugated surfaces on the bottom wall of the Solar Air Heater channel, having aspect ratio of 26:5 was performed. The results were evaluated in terms of enhancement in heat transfer (Nu/Nu s), friction factor ratio (f/f s) and thermal performance factor ( η). Three different cases and nine configurations with a pitch to rib/corrugation height ratio of 4.0 were studied. Case A consists of a smooth, continuous square rib, inline and staggered broken ribs. Case B comprises 30°, 45°, 60° and 90° trapezoidal corrugated geometries while Case C is the comparison of smooth, wavy corrugated and the best configurations of cases A and B. The results show that rectangular duct with staggered broken ribs and trapezoidal corrugation at 45° are the best configurations for case A and B, respectively. The 45° corrugated configuration is the best one amongst all, with values of 1.53, 1.5 and 1.33% for Nu/Nu s, f/f s and η respectively.</abstract><cop>Warsaw</cop><pub>Polish Academy of Sciences</pub><doi>10.24425/ame.2021.137048</doi><tpages>31</tpages><oa>free_for_read</oa></addata></record> |
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| subjects | Air heaters Aspect ratio Configurations Corrugation Friction factor Heat transfer heat transfer enhancement Optimization Performance evaluation Pressure drop solar air heater thermal performance factor turbulence promoters |
| title | Evaluation of thermal performance factor for solar air heaters with artificially roughened channels |
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