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| Transient heat transfer characteristics of air-array-jet impingement with different nozzle arrangements on high-tempera-ture flat plate in small jet-to-plate distance |
| LI Meixiang1,2,3, ZHU Keqian1,2,3, XIE Yu1, CAI Tingting1,2,3, YUAN Ningyi1,2,3, DING Jianning1,2,3,4* |
| 1. School of Mechanical Engineering, Changzhou University, Changzhou, Jiangsu 213164, China; 2. Jiangsu Collaborative Innovation Center for Photovoltaic Science and Engineering, Changzhou, Jiangsu 213164, China; 3. Jiangsu Province Cultivation Base for State Key Laboratory of Photovoltaic Science and Technology, Changzhou, Jiangsu 213164, China; 4. School of Mechanical Engineering, Jiangsu University, Zhenjiang, Jiangsu 212013, China. |
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Abstract Numerical studies on transient heat transfer characteristics of air-array-jet impingement are presented, for a small jet-to-plate distance and a large temperature difference between nozzles and plate in the paper. The dimensionless jet-to-plate distance(H/D)is 0.2, and non-dimensional nozzle-to-nozzle spacing(S/D)is 3,4,5 and 6, respectively. It is found that the quenching time is shortened at a constant total mass flow at air jet inlet m·(m·=218.21 kg/h), and the heat transfer uniformity is deteriorated as S/D increases. However, the added reversed-flow nozzles can shorten the quenching time of the glass plate considerably with a modest change in the heat transfer uniformity. The results at variable m· are the same as those at a fixed m·. Furthermore, the arrangement of nozzles is also discussed in this paper. Based on these results, an appropriate proposal for ultra-thin glass tempering process is presented.
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Received: 10 April 2019
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