Influence law and mechanism of medium flow density on heat exchange rate of jet quenching interface of aluminum alloy

doi:10.13251/j.issn.0254-6051.2022.02.043

Abstract

Abstract: The heat exchange processes of water jet quenching, spray quenching and high speed air quenching on high temperature aluminum alloy surface were studied by jet quenching test. The heat flux (q) and heat transfer coefficient (h) of the three kinds of on-line quenching interface were calculated by back analysis method, and the influence law and mechanism of the medium flux density (q_s) on the interface heat exchange rate were mainly investigated. The results show that with the increase of q_s, the heat exchange rate of quenching interface increases first and then decreases. There is a critical q_s, when the critical heat current density (q_c) reaches the maximum value. When q_s is less than its critical value, the interfacial heat exchange rate increases with the increase of q_s. When q_s is greater than the critical value, the interfacial heat exchange rate decreases with the increase of q_s.The maximum heat absorption (Q_max) of the unit volume cooling medium in spray quenching is the highest, and when the quenching medium is the same, the Q_max decreases with the increase of q_s. Increasing q_s has the best effect on improving the heat exchange rate of water jet quenching surface.

Key words: jet quenching, on-line quenching, interface heat exchange rate, interfacial heat flux, medium flow density

CLC Number:

TG379

Xu Rong, Li Luoxing. Influence law and mechanism of medium flow density on heat exchange rate of jet quenching interface of aluminum alloy[J]. Heat Treatment of Metals, 2022, 47(2): 243-249.

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