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Mathematical Simulation of Heat Transfer and Chemical Reactions in an Equilibrium Dissociating Gas

  • HYDROGASDYNAMICS IN TECHNOLOGICAL PROCESSES
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Journal of Engineering Physics and Thermophysics Aims and scope

Results of investigations of the heat exchange in the turbulent flow of nitrogen tetroxide in a cylindrical channel are presented. The equilibrium stage of the dissociation reaction N2O4 ⇄ 2NO2 was considered. It was established that an increase in the temperature of the wall of the channel leads to an intensification of the chemical reaction proceeding in the N2O4 flow and causes the absorption of the heat, transferred from the channel wall, in this flow to increase, with the result that the temperature of the near-wall layers and the thickness of the thermal boundary layer in the chemically reactive gas flow decrease to a level lower than those of a chemically inert heat-transfer agent. It is shown that the use of a dissociating heat-transfer agent in a short channel is advantageous in the case where the rate of its flow is small, and, to increase the efficiency of heat exchange in a high-velocity flow of such an agent, it is necessary to increase the length of a heat exchanger. Approximation formulas for determining the criteria of heat exchange in flows of chemically inert and reactive gases have been obtained.

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Correspondence to O. V. Matvienko.

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Translated from Inzhenerno-Fizicheskii Zhurnal, Vol. 94, No. 2, pp. 453–465, March–April, 2021.

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Matvienko, O.V., Martynov, P.S. Mathematical Simulation of Heat Transfer and Chemical Reactions in an Equilibrium Dissociating Gas. J Eng Phys Thermophy 94, 437–449 (2021). https://doi.org/10.1007/s10891-021-02314-9

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