Open Access

ARTICLE

The Hydrodynamic Crisis of Nucleate Boiling in a Horizontal Thin Layer of Dielectric Liquid HFE-7100

by V. I. Zhukov^1,2,*, A. N. Pavlenko¹

1 Kutateladze Institute of Thermophysics, Siberian Branch, Russian Academy of Sciences, Novosibirsk, 630090, Russia
2 Department of Chemistry and Chemical Technology, Novosibirsk State Technical University, Novosibirsk, 630073, Russia

* Corresponding Author: V. I. Zhukov. Email:

(This article belongs to the Special Issue: Heat and Mass Transfer in Energy Equipment)

Frontiers in Heat and Mass Transfer 2024, 22(6), 1761-1775. https://doi.org/10.32604/fhmt.2024.056779

Received 30 July 2024; Accepted 16 October 2024; Issue published 19 December 2024

Abstract

The results of an experimental study on critical heat fluxes (CHF) during the nucleate boiling of the HFE-7100 dielectric liquid in horizontal layers of different heights at atmospheric pressure are presented. The existence of a critical layer height has been established. In layers above the critical layer height, a hydrodynamic boiling crisis occurs; in thinner layers, a surface drying crisis occurs. At a layer height equal to the critical value, a dry spot first appears, followed by transition boiling, which gradually spreads to the entire heating surface. In these experiments, the critical layer height was equal to 6 mm. In a layer of liquid with a critical layer height of 6 mm, a two-dimensional Taylor instability was observed in the transition boiling mode when the ratio of the diameter of the “vapor jets” to the distance between them, as well as the void fractions in the layer (~π/16), corresponded to the main provisions of the Zuber theory. The calculation of CHF using the relations of Zuber’s theory, when approaching the crisis from the transition boiling side and taking into account the real geometric dimensions, aligns well with the experimental results.

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Keywords

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