Abstract
The article is the second part of the review devoted to the boiling of a liquid subcooled to the saturation temperature, the process which enables the removal of heat fluxes of extremely high density1 The first part presents the specific features of the process mechanism, together with its phenomenological model, and analyzes data on heat transfer and hydraulic resistance. This article is devoted to the heat-transfer crisis during subcooled boiling and the issues of heat-transfer enhancement. The heat-transfer crisis has been demonstrated to be caused by a sharp change in the flow structure involving the corresponding transformation of the heat-transfer mechanism, when the ensemble of individual bubbles is replaced with the regime of coalesced bubbles and vapor agglomerates, thereby causing the conditions facilitating the rupture of near-wall liquid films and the formation of dry spots increasing in size. The simplest and sufficiently effective relationship for calculating the critical heat flux (qcr) at high subcooling values is the modified empirical formula proposed by Tong. It has been concluded that it would be impractical to describe qcr by a single formula in the entire range of studied subcoolings. Several processes for modifying the heating surface to enhance heat transfer and increase qcr are briefly examined. Engineering problems arising in implementing these processes are discussed. The advisability of continuing comprehensive studies into the subcooled liquid boiling, primarily for understanding the physical features of the phenomenon, has been demonstrated.
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Notes
N.V. Vasil’ev, Yu.A. Zeigarnik, and K.A. Khodakov, Boiling in Forced Convection of Subcooled Liquid as a Method for Removing High Heat Fluxes (Review): Part 1. Characteristics, Mechanism and Model of the Process, Heat Transfer, and Hydraulic Resistance, Thermal Engineering, 69, 235–251 (2022).
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The study was financially supported by the Russian Foundation for Basic Research under research project no. 20-18-50244.
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Translated by T. Krasnoshchekova
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Vasil’ev, N.V., Zeigarnik, Y.A. & Khodakov, K.A. Boiling in Forced Convection of Subcooled Liquid as a Method for Removing High Heat Fluxes (Review): Part 2. Critical Heat Fluxes and Heat-Transfer Enhancement. Therm. Eng. 69, 313–325 (2022). https://doi.org/10.1134/S004060152205007X
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DOI: https://doi.org/10.1134/S004060152205007X