Numerical Studies of Heat Transfer of Flue Gases in a Narrow Channel with an Improved Heat Exchange Surface

Abstract

This article presents the results of a study of heat transfer on surfaces with spherical depressions. It provides a rationale for the relevance of the study and a brief overview of previously conducted studies. It specifies the factors that affect the intensity of heat transfer, and explains the mechanism of flow turbulence in a channel with spherical depressions and protrusions. It displays data that determine the parameters that are directly or indirectly included in the similarity criteria, initial and boundary conditions, as well as the geometric and thermal characteristics necessary to create a mathematical model. The mathematical model of heat exchange in channels with an improved heat exchange surface with applied spherical depressions and protrusions is considered, allowing to estimate the influence of the presence of local turbulent areas on the channel surfaces on the Nusselt number in comparison with a similar channel with smooth surfaces. Also, the results of numerical studies on the influence of turbulence on heat exchange characteristics of channels with an improved heat exchange surface are presented in the form of graphs.