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Features of Supercritical Heat Transfer at Short Times and Small Sizes

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Abstract

In this article, we present new data on the non-stationary heat transfer in supercritical water at different heating regimes with characteristic times from 5 ms to 15 ms. The pressure, being the parameter of the experiment, was varied from the critical pressure pc up to 4.5 p/pc (namely, up to 1 kbar). These data serve as a significant addition to the well-known picture of supercritical heat transfer by phenomena inherent in the non-stationary case. The impetus for the study came from the discovery of an unexpected result observed in conductive heat transfer experiments under a powerful heat release—namely, the effect of a decrease in the intensity of heat transfer in the course of a rapid transition of the compressed fluid to the supercritical region of temperatures along the supercritical isobar. The observed effect, which exhibits a threshold character in the vicinity of the critical temperature, occurs up to pressures of 3–4 p/pc. The discussion is based on the hypothesis of a suppression of fluctuations by various external factors. It is assumed that under conditions of a short-term experiment, the complete thermodynamic equilibrium cannot be reached. This factor, along with the large temperature gradient and the presence of a heating surface, “cuts off” large-scale fluctuations responsible for the anomalous behaviour of thermophysical properties in the stationary conditions.

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Data Availability

The datasets of the primary experimental data are available at https://yadi.sk/d/p8TJKcl6rBsEQg.

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Acknowledgements

This article is dedicated to the memory of Professor Dmitry Yu. Ivanov (17/10/1939–06/03/2021), see Refs. [9, 17].

Funding

This study was supported by the Russian Science Foundation (Project No. 19-19-00115).

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Authors and Affiliations

  1. Institute of Thermal Physics, Ural Branch of RAS, Ekaterinburg, Russian Federation

    P. V. Skripov & S. B. Rutin

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  1. P. V. Skripov
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Correspondence to P. V. Skripov.

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Skripov, P.V., Rutin, S.B. Features of Supercritical Heat Transfer at Short Times and Small Sizes. Int J Thermophys 42, 110 (2021). https://doi.org/10.1007/s10765-021-02869-y

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