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THERMAL MODEL-BASED DETERMINATION OF DISSOCIATION DEGREE OF HYDROGEN FLOWING IN A HOT TUBE

A thermal model of a cylindrical thin-walled tube heated up to a high temperature by electric current has been developed. For the current-carrying tube, the heat conduction equation is solved by taking into account the tube radiation, heat exchange with the gas surrounding and flowing inside the tube, and the gas dissociation at the tube surface. The model is verified via comparison with experimental data on the hot tube temperature and electrical resistance for argon, helium, and hydrogen up to a tube temperature of 2200◦C. To ground the heat exchange with the flowing gas used in the model, calculations of the gas flow in the tube have been performed using the direct simulation Monte Carlo method. The proposed thermal model allows determining the channels of distribution of the energy released at the tube as a result of Joule heating. The calculated heat balance makes it possible to estimate the degree of hydrogen dissociation at the outlet of the tube.