Abstract
The paper presents a brief review of existing model approaches to the description of critical heat flux during nucleate boiling. In the context of the discussion presented in this issue of the journal, some arguments are outlined in favor of a mechanism governing the development of the boiling crisis, which is induced by the Landau instabilities at the interfacial surface during intensive evaporation in the liquid microfilm ensemble. Reliable justification of the assumptions adopted in developing the discussed models requires deeper and systematic investigations into the structure of a two-phase layer at the heat-transfer surface and its stage-wise evolutions as the critical heat flux is approached. It is demonstrated that it is critical in this case to find the dependence of the wetted surface percentage (considering the process unsteadiness) on the heat flux at various reduced pressures, wetting properties of the heat-transfer surface, thermal diffusivities, and heater wall thicknesses. It is also necessary to reveal the regularities of structure formation and determine the characteristic spatial and time scales for an evolving ensemble of microfilms in the macrolayer at the heat-transfer surface. Answers to these key issues will yield the necessary but currently insufficient information for constructing the most justified and complete (in terms of the number of stages included and variety of considered physical mechanisms of transient process development) theory of nucleate boiling crisis for elaboration of the most effective methods of boiling heat-transfer enhancement using micro- or nano-structured heat-transfer surfaces.
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ACKNOWLEDGMENTS
I am grateful to the editorial board of the Thermal Engineering journal for the chance to take part in this discussion and share some of my ideas on this issue, which is very important for the development of boiling physics and finding solutions to a number of new applied problems.
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Translated by T. Krasnoshchekova
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Pavlenko, A.N. On the Physics of the Development of Boiling Crisis Phenomena (Comments on the Article of E.D. Fedorovich “On the Expediency of Developing a Two-Stage Model of Boiling Crisis of a Liquid Wetting a Heating Surface”). Therm. Eng. 67, 853–859 (2020). https://doi.org/10.1134/S0040601520110099
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DOI: https://doi.org/10.1134/S0040601520110099