Numerical simulation on impingement heat transfer characteristics in ultra fast cooling

2018 International Conference on Advanced Materials, Intelligent Manufacturing and Automation

材料科学;机械制造;运输工程

Liu, G.-Y.^1 ; Zhang, Y.^1 ; Song, M.^1 ; Feng, C.-F.^2 ; Zhu, D.-M.^1

School of Mechanical Engineering, University of Science and Technology Beijing, Beijing

100083, China^1

Beijing Shougang Cold Rolling Co. Ltd., Beijing

101304, China^2

关键词: Average heat transfers;    Convective heat transfer;    Impingement heat transfer;    Nozzle diameter;    Surface temperatures;    Ultra-fast cooling;    Uniformity of heat;    Water pressures;   

Others  :  https://iopscience.iop.org/article/10.1088/1757-899X/382/4/042018/pdf
DOI  :  10.1088/1757-899X/382/4/042018

学科分类：材料科学（综合）

来源: IOP

【 摘 要 】

Numerical simulation was performed to investigate convective heat transfer at the impinging zone of non-immersed pipe jet with Fluent in the ultra fast cooling process, and some influencing factors on heat transfer such as jet direction-to-plate angle, jet pressure (velocity), nozzle-to-impinging plate spacing (height), nozzle interval, nozzle diameter, and surface temperature of the plate were analyzed and designed. The results show that, in the ultra fast cooling process, the reasonable jet direction-to-plate angle is between 30 ° and 45 °; the economic water pressure is generally about 0.6MPa no more than 1.0MPa; since nozzle-to-impinging plate spacing (height) has little influence on the heat transfer coefficient due to the large water speed, nozzle-to-impinging plate spacing (height) is generally adjusted between 300 and 400mm; the nozzle interval should be set properly according to the dynamic relationship of the nozzle diameter and the jet acting zone, besides the maximum average heat transfer coefficient and the most efficient heat transfer will be got while nozzle interval is between 30mm and 40mm under the certain flow rate; considering the efficiency and the uniformity of heat transfer, the reasonable nozzle diameter should be set at 4mm. The model accuracy and correctness are proved by experiments under different test conditions, which show that simulation results are reliable and reasonable.