Interfacial heat exchange analysis of metal materials during spray quenching process

doi:10.13251/j.issn.0254-6051.2020.06.006

Abstract

Abstract: The interfacial heat exchange of aluminum alloy during spray quenching process was studied by end quenching test. The interfacial heat flux (q) and interfacial heat transfer coefficient (h) of all the tests were solved by inverse heat conduction method. The influence of spray pressure, nozzle diameter and surface roughness on the interfacial heat exchange was analyzed. The results show that the spray pressure has an effect on the whole quenching interface heat transfer process, but it has a greater effect on the transition boiling stage. The larger the spray pressure, the larger the q and its peak q_max, and the shorter the time to enter the nucleation boiling stage. The larger the nozzle diameter is, the larger q and q_max are, and the earlier the nozzle enters the nucleation boiling stage. However, there is an upper limit on the effect of increasing the nozzle diameter on the interfacial heat transfer. With the increase of surface roughness, q and q_max decrease first and then increase. Under the experimental conditions, the effects of spray pressure, nozzle diameter and surface roughness on the interfacial heat exchange are not affected by the other two parameters. Under the experimental conditions, the influence of any of the above three parameters, i.e. spray pressure, nozzle diameter and surface roughness, on the interfacial heat exchange is not affected by the other two parameters. In addition, the second increase of q curve during the nucleation boiling stage is resulted in some experiments due to intense nucleation boiling caused by the sprayed droplets with very small diameter uniformly covering the whole thermal surface.

Key words: spray quenching, interface heat exchange, spray pressure, nozzle diameter, surface roughness

CLC Number:

TG379

Xu Rong, Li Luoxing. Interfacial heat exchange analysis of metal materials during spray quenching process[J]. Heat Treatment of Metals, 2020, 45(6): 28-33.

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