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ISSN Print: 2150-3621
ISSN Online: 2150-363X
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SPECIFIC FEATURES OF STRONGLY SUPERHEATED STEAM CONDENSATION ON THE SURFACE OF A STRONGLY SUBCOOLED WATER JET
ABSTRACT
This work is devoted to analysis of superheated steam condensation. As shown in the paper, a physically accurate structure of the dependences for heat transfer during condensation of superheated steam on the surface of a subcooled water jet can be obtained by considering the effect of surface tension at the phase boundary and with the unsteady nature of thermal hydraulic processes. Currently there is neither the quantitative theory of heat transfer in film boiling of strongly subcooled liquid, nor convincing qualitative explanation of the high intensity of heat transfer between the superheated solid surface and the subcooled liquid under conditions when direct contact between the surface and liquid is impossible. For the case of superheated steam condensation on the surface of the jet, strongly subcooled liquid heat transfer is considered similarly to the processes of heat transfer in inverted annular flow and with quenching. It is known that the experimental heat transfer coefficients for subcooled water film boiling are of 1-2 orders of magnitude higher than those observed in film boiling of saturated liquid. Until now, a reasonable explanation for such a strong effect has not been found. It is shown that taking into account the wave nature of the process, it is possible to obtain quantitative values of heat transfer coefficients which more or less agree with experimental data.