Discrete rough surface intensifiers in the thermal decomposition plants: current status and future potential

Abstract

It is known that roughness affects the drop in hydraulic pressure, increasing the resistance force. The formation of a boundary layer on rough surfaces significantly affects fluid dynamics and the process of heat exchange in convective flows, causing disturbances in the velocity profile and affecting surface resistance, turbulent mixing and heat exchange. Despite the fact that there are a large number of experimental and CFD studies in the field of studying turbulent flow, there is no full-fledged review of this issue. In view of this, it is necessary to systematize studies related to the study of the influence of a rough surface during turbulent fluid flow. In most cases, roughness is quantified only using a single scaling parameter – the equivalent roughness height of a grain of sand, which can be expressed based on statistical parameters. This article presents an overview and generalization of data on the parameters and characteristics of rough surfaces. The correlation method is considered using the standard deviation in the slope of the roughness profile, as well as the effect of the secondary flow on the flow of the coolant in a closed space. The results of this study can be used in the intensification of heat transfer in thermal destruction reactors using intensifiers in the form of discretely rough surfaces. Keywords: discrete-rough surfaces; thermal contact surface;и rough surface; turbulent flow; pyrolysis reactor; thermal destruction; heat exchanger.