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High-Power Heat Transfer in Supercritical Fluids: Microscale Times and Sizes

High-Power Heat Transfer in Supercritical Fluids: Microscale Times and Sizes

Pavel V. Skripov, Aleksandr D. Yampol'skiy, Sergey B. Rutin
Copyright: © 2021 |Pages: 27
ISBN13: 9781799857969|ISBN10: 1799857964|ISBN13 Softcover: 9781799857976|EISBN13: 9781799857983
DOI: 10.4018/978-1-7998-5796-9.ch012
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MLA

Skripov, Pavel V., et al. "High-Power Heat Transfer in Supercritical Fluids: Microscale Times and Sizes." Handbook of Research on Advancements in Supercritical Fluids Applications for Sustainable Energy Systems, edited by Lin Chen, IGI Global, 2021, pp. 424-450. https://doi.org/10.4018/978-1-7998-5796-9.ch012

APA

Skripov, P. V., Yampol'skiy, A. D., & Rutin, S. B. (2021). High-Power Heat Transfer in Supercritical Fluids: Microscale Times and Sizes. In L. Chen (Ed.), Handbook of Research on Advancements in Supercritical Fluids Applications for Sustainable Energy Systems (pp. 424-450). IGI Global. https://doi.org/10.4018/978-1-7998-5796-9.ch012

Chicago

Skripov, Pavel V., Aleksandr D. Yampol'skiy, and Sergey B. Rutin. "High-Power Heat Transfer in Supercritical Fluids: Microscale Times and Sizes." In Handbook of Research on Advancements in Supercritical Fluids Applications for Sustainable Energy Systems, edited by Lin Chen, 424-450. Hershey, PA: IGI Global, 2021. https://doi.org/10.4018/978-1-7998-5796-9.ch012

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Abstract

Non-stationary heat transfer in supercritical fluids at relatively small temporal and spatial scales was studied experimentally. The aim of the study was to clarify the peculiarities of conductive heat transfer mode at significant heat loads. An unexpected stepwise decrease in the instant heat transfer coefficient has been revealed in the course of crossing the vicinity of the critical temperature along the supercritical isobar. This means that the peaks of isobaric heat capacity and excess thermal conductivity, which are known from stationary measurements, do not affect the experimental results. It is assumed that the action of considerable gradient in temperature and the presence of heat-transfer surface in pulse heated system can serve as factors that suppress large-scale fluctuations, leading to a “smoothing” the critical enhancement of the thermophysical properties. As an important consequence, this study gives new insight into selection of the operating pressure of supercritical heat transfer agent.

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