SATURATION TEMPERATURE AND HEAT TRANSFER DURING NUCLEATE BOILING ON A SUBSTRATE

The physical parameters exerting an eff ect on the density of the heat fl ux transported by vapor bubbles during nucleate boiling are considered. It is shown that this density depends on the radius of bubble departure from the substrate, the rate of formation of departing bubbles per unit area of the substrate, the thermophysical properties of the liquid, and the saturation temperature. It has been established that the density of the energy fl ux transported by bubbles increases exponentially with the saturation temperature and depends strongly on the bubble departure radius. It is shown that the thickness of the superheated liquid layer, inside which bubbles grow, does not exceed several hundred microns and depends on the total energy fl ux. In this case, if the average distance between the bubbles is comparable to the departure radius, bubble coagulation leads to a boiling crisis
The physical parameters exerting an eff ect on the density of the heat fl ux transported by vapor bubbles during nucleate boiling are considered. It is shown that this density depends on the radius of bubble departure from the substrate, the rate of formation of departing bubbles per unit area of the substrate, the thermophysical properties of the liquid, and the saturation temperature. It has been established that the density of the energy fl ux transported by bubbles increases exponentially with the saturation temperature and depends strongly on the bubble departure radius. It is shown that the thickness of the superheated liquid layer, inside which bubbles grow, does not exceed several hundred microns and depends on the total energy fl ux. In this case, if the average distance between the bubbles is comparable to the departure radius, bubble coagulation leads to a boiling crisis
Author:  I. A. Koznacheev, A. I. Malinovskii, O. S. Rabinovich, S. P. Fisenko
Keywords:  bubbles, superheating, departure radius, coagulation, energy fl ux
Page:  1862