过冷液体滞止区喷流沸腾临界热流密度的理论研究

new mechanistic model of critical heat flux in subcooled impingement boiling on the stagnation zone is proposed in this paper. It is based on the combination of the Helmholtz instability theory of macrolayer and the turbulent diffusion heat transfer caused by the rapid quick growth and condensation of vapor bubbles on the heating surface in subcooled impingement boiling. Theoretical correlation of the bubble deduced turbulent heat diffusion coefficient in subcooled impingement boiling on the stagnation zone is obtained. The physical properties of the heater and the working fluid, the solid-liquid contact angle, the heat flux and superheat of heater, the subcooling of fluid and the fluid velocity all have effect on the bubble deduced turbulent heat diffusion coefficient. A semi-theoretical correlation of the critical heat flux for subcooled jet impingement boiling on stagnation zone is also derived, and the theoretical analysis result is verified by the experimental result obtained on the smooth copper heating surface.