Numerical solution of the conjugated non-stationary problem of heat transfer under conditions of boiling begin in a tube

Consideration is being given to results of numerical investigation into the conjugated non-stationary problem of heat transfer during two-phase flow in a tube under conditionsof boiling beginning. Investigations were conducted on the basis of the mathematical model of homogeneous flow where two-phase medium is changed for pseudohomogeneous one with thermal-physical properties, subtituting the thermal-physical properties of each of media. The presented thermal-physical model of the gas-steam-liquid flow under bubble flow conditions enables to obtain many data on states of the flow and the channel, which makes possible the evaluation of the effect of various exchange processes, determination of relationships among main thermal processes and measured characteristics of steam-liquid flows, prediction of the following local and integral flow parameters important for applications: length distribution of the true volumetric steam content, averaged with respect to the cross-section; determination of temperature fields in the wall and in the flow at varous moments of time