Effects of water temperature on the spray cooling rate of aluminum alloy plate. (25th March 2020)

• Record Type: Journal Article
• Authors: Zhu, Cheng; Dou, Ruifeng; Wen, Zhi; Liu, Xunliang; Miao, Yongbang
• Is Part Of: Applied thermal engineering. Volume 169(2019)
• Publication Date: 2020-03-25
• Subjects: Water spray -- Water temperature -- Inverse heat conduction -- Boiling -- Evaporation; Heat engineering -- Periodicals; Heating -- Equipment and supplies -- Periodicals; Periodicals; 621.40205
• DOI: 10.1016/j.applthermaleng.2020.114928
• Languages: English
• ISSNs: 1359-4311

Abstract

Highlights: Experiments for full cone water spray cooling of high temperature aluminum plate are carried out. 2D inverse heat conduction model is employed to obtain the local heat flux. The increasing of water spray temperature enhances the boiling heat transfer. Abstract: A series of experiments was carried out to investigate the effects of water temperature on spray cooling heat flux. The specimen is made of 7075 aluminum alloy, and the spray is water. Water temperature T w changes from 7.9 °C to 51.6 °C. Local water flux M w shifts from 0.377 to 1.036 mg·s −1 ·mm −2 . The one-dimensional (1D) inverse heat conduction model fails to reflect the distribution of heat flux in spray cooling heat transfer, whereas the two-dimensional (2D) model reveals the effect of local water flux M w on the distribution of heat flux q . When nozzle height H is 4.3 cm, heat flux q is twice as great, whereas H is 12.3 cm. Hence, a larger local water flux M w benefits the boiling heat transfer of the specimen. Whether H = 12.3 cm or H = 4.3 cm, heat flux q rises with increasing water temperature T w when cooling surface temperature T s is between 100 °C and 250 °C.