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An Apparatus for Studying Nonstationary Heat Exchange in Liquid Media

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Abstract

An apparatus is described for studying unsteady heat transfer in various liquid media by the method of controlled heating of a thin wire probe. The main link of the setup is a high-speed electronic regulator that controls the power dissipated by the probe depending on the control voltage at the regulator input. The main parameters of the apparatus are: the probe is a 1-cm-long 20-μm platinum wire and the controller response time is ≈1–2 μs, the accuracy of maintaining the power value is 0.05%, the heating time is 1–500 ms, and the heat flux density from the probe surface is up to 20 MW/m2. A measurement technique is presented and an example of using a setup for studying the spinodal decomposition of an aqueous solution of polypropylene glycol (PPG-425), which has a lower critical dissolution temperature, is provided.

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Funding

This study was financed by the Russian Science Foundation (project no. 19-19-00115).

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Authors and Affiliations

  1. Institute of Thermophysics, Ural Branch, Russian Academy of Sciences, 620016, Yekaterinburg, Russia

    S. B. Rutin

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  1. S. B. Rutin
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Correspondence to S. B. Rutin.

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Rutin, S.B. An Apparatus for Studying Nonstationary Heat Exchange in Liquid Media. Instrum Exp Tech 64, 781–784 (2021). https://doi.org/10.1134/S0020441221050109

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