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Thermophysics and Aeromechanics

2018 year, number 6

Self-oscillatory regime of boiling of a highly subcooled liquid in a flow-passage annular duct

S.P. Aktershev1, A.A. Levin2, I.V. Mesentsev1, and N.N. Mesentseva1
1Kutateladze Institute of Thermophysics SB RAS, Novosibirsk, Russia
2Melentiev Institute of Power Engineering Systems SB RAS, Irkutsk, Russia
E-mail: sergey-aktershev@mail.ru
Keywords: boiling, subcooled liquid, evaporation, condensation, pressure pulsations, self-oscillations
Pages: 875–887

Abstract

The results of an experimental and theoretical investigation of highly subcooled ethanol in an annular flow-passage duct under the conditions of pulsed heat generation in the wall cooled by liquid flow are presented. The formation of a vapor film on the heater wall and long-lasting pressure oscillations of high amplitude in the duct (the self-oscillatory regime) have been observed in experiments. A mathematical model of the ethanol boiling up has been developed to take into account the evaporation of the overheated liquid near the heater wall and the vapor condensation in the flow of a subcooled liquid. The proposed model describes both the decaying oscillations of the vapor layer and the development of the self-oscillatory regime, which predicts well the amplitude and frequency of nonlinear oscillations. Numerical computations have shown that the self-oscillatory regime is realized due to evaporation of a periodically renewed microlayer on the heater wall. Computational results agree well with experimental data.