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.

中文翻译：

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关于沸腾危机现象发展的物理原理（ED Fedorovich的文章“关于开发加热润湿表面的液体沸腾危机的两阶段模型的权宜之计”）

摘要

本文简要介绍了现有模型方法，以描述成核沸腾过程中的临界热通量。在本期杂志的讨论中，概述了一些论点，以支持一种控制沸腾危机发展的机制，该机制是由液态微胶卷中大量蒸发过程中界面表面的朗道不稳定性引起的。要可靠地证明在开发所讨论模型时采用的假设，需要对传热表面两相层的结构及其随着接近临界热通量的阶段性演变进行更深入，系统的研究。事实证明，在这种情况下，找到润湿表面百分比（考虑工艺不稳定）与各种减压，传热表面的润湿性，热扩散率和加热器壁厚之间的热通量的相关性至关重要。 。还必须揭示结构形成的规律性，并确定传热表面大分子层中微缩薄膜的整体演化的特征空间和时间尺度。