The Different Types of Heat Transfer During Boiling

Abstract

Whereas heat transfer during convection can be described by physical properties, such as viscosity, density, thermal conductivity, thermal coefficient of expansion, as well as by geometric parameters, for boiling processes, there are of additional significance those variables that are connected with the phase transformation. To these belong: vaporization enthalpy, boiling temperature, density of vapor, and surface tension. The microstructure and the material of the heating surface also play a role. Because of this multiplicity of variables, it is more difficult to suggest equations for the calculation of heat transfer coefficients than it is in the case of other problems of heat transfer. Also, we are far from having worked out a complete theory, because the physical phenomena are too complicated and in no way have been sufficiently studied.