Periodical Model of Turbulent Heat Transfer

Abstract

This chapter occupies a particular place in the book, whose title itself indicates an involvement in heat transfer problems of the conjugate convective–conductive nature. Unlike the first eight chapters, the ninth chapter is concentrated exclusively on nonconjugate periodic heat transfer. Thus, the aspect of conjugation “fluid–solid body” falls out of the topic of this chapter. The objective of the ninth chapter consists in modeling of heat transfer on the basis of an analysis of periodic internal structure of near-wall turbulence. The author deemed justifiable to make the following excursus. The model of thermohydraulic pulsations in helium flow considered in Chap. 8 means knowledge of intensity of heat transfer between the wall and turbulent flow. The thermophysical properties of helium in the area of supercritical pressures (SCP) exhibit rather complicated and even to a certain extent freakish character of variation. The second reason, which caused the author to recede from the analysis of conjugate problems, is pulsatory character of turbulent heat transfer by its very nature. The tempting possibility to undertake an approximate description of turbulent heat transfer in the area of SCP on the basis of a simple periodic model was a decisive argument to write the present chapter.