Subchannel analytical formulation of the closure relationships for single and two-phase flow wall friction, heat and mass transfer

The first aim of the paper is to call attention to the suggested approach of constructing generalized relationships for subchannel wall friction, heat and mass transfer coefficients, with taking into account azimuthal substance transfer effects. The approach being based on the Reynolds flow, boundary layer and substance transfer generalized coefficient concepts. The second aim of the paper is to show the way in which the suggested relationship is used to deduce integral relationships for coefficients mentioned above. The third aim is to illustrate the validity of the 'conformity principle' for the limiting cases. The method proposed in this paper is founded on the similarity theory, boundary layer model and a phenomenological description of the regularity of the substance transfer (momentum, heat and mass) as well as on an adequate simulation of the flows structure forms by a generalized approach to build (an integrated in form and semi-empirical in maintenance structure) analytical relationships for wall friction, heat and mass transfer coefficients. (author)