Features of the dynamics of development and the thermal stability of dry spots in flowing-down liquid films
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A numerical experiment for description of the critical phenomena in the case of intense heat exchange in flowing-down wave films of a cryogenic liquid on heat-releasing surfaces bounded in length has been carried out. Numerical modeling of the thermal stability of dry spots with heat-transfer conditions determined experimentally yields a satisfactory agreement with the values of the critical heat-flux density obtained in the experiments. This confirms the hypothesis that, in certain regimes of film flow, the development of a crisis is related to the upstream propagation of a temperature disturbance, when the threshold of thermal stability of the dry spots is attained. The value of the critical heat flux is much lower than that calculated from the existing hydrodynamic models.
KeywordsCritical Heat Flux Film Flow Temperature Disturbance Cryogenic Liquid Film Liquid Flow
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