Mathematical simulation of transient processes in a circular channel with granular layer under conditions of subcooled water boiling. Formation of pressure wave

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The process of formation and growth of vapor bubbles until the instant of their merging into a vapor film is investigated in view of actual roughness of the surface and of the dependence of activation time of the respective nucleation sites on the surface temperature under conditions of pulsed heat release in the heater wall. A microlayer model is employed in view of formation of dry spot under the bubble. Also solved is the problem on the formation of a pressure wave in a circular channel as a result of explosive boiling of superheated microlayer under the bubbles. The obtained results enable one to describe a number of experimental data and investigate unsteady-state wave processes occurring under subcooled liquid boiling in the presence of a granular layer.

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