The results of a study of heat transfer in the case of a liquid metal upflow in a vertical heated pipe without a magnetic field, as well as in the presence of longitudinal or transverse magnetic fields, are presented. With the use of microthermocouple probes, profiles of the averaged velocity and of temperature, distribution of local heat transfer coefficients, and fluctuation characteristics of temperature in the flow were obtained. In the absence of a magnetic field, a decrease in the heat transfer coefficients compared to a purely turbulent level was found, which agrees qualitatively with the general laws governing heat transfer in mixed convection for nonmetals. Studies carried out in a longitudinal magnetic field have shown that in the configuration of an upward flow too, one cannot avoid the influence of thermogravitational convection, which only increases in a laminarized flow, leading to an increase in instabilities and to the appearance of low-frequency velocity and temperature pulsations. In a transverse magnetic field with an upward flow, interesting effects were also revealed, associated with the action of electromagnetic forces and thermogravitational convection on the hydrodynamics of averaged flow and fluctuation characteristics of heat transfer.
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Translated from Inzhenerno-Fizicheskii Zhurnal, Vol. 95, No. 6, pp. 1577–1588, November–December, 2022.
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Luchinkin, N.A., Razuvanov, N.G., Polyanskaya, O.N. et al. Heat Transfer in a Liquid Metal Upflow in a Pipe with Mixed Turbulent Convection Complicated by the Influence of Magnetic Field. J Eng Phys Thermophy 95, 1548–1559 (2022). https://doi.org/10.1007/s10891-022-02623-7
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DOI: https://doi.org/10.1007/s10891-022-02623-7