Three-dimensional analysis of the impact of wall roughness with micro-pines on thermo-hydrodynamic behavior

Abstract

Artificial roughness in the form of repeated ribs on a surface is an effective technique to improve the heat transfer rate. A numerical study on the heat transfer characteristics and flow structure of a fully developed turbulent flowing fluid in a rectangular duct having repeated transverse rib roughness. The thermo-hydrodynamic performance was obtained by varying important parameters, such as rib configurations: Six different configurations were analyzed. In this analysis, the Reynolds number of the flow is chosen in the range (40,000, 100,000). The system of equations governing the physical phenomenon is composed of nonlinear partial equations whose analytical solution is complex, and approximation methods are therefore essential. In this work, we have adopted numerical modeling based on a finite volume scheme allowing us to pass from the problem defined on a continuous study domain and governed by a system of equations with an infinite number of unknowns to the equivalent problem defined on a discrete study domain and governed by a system of equations with a finite number of unknowns. The turbulence phenomenon is modeled using the classical turbulence model (k–ɛ). The results show the relative evolution of the Nusselt number for the different cases studied. The different cases: case (1), case (2), case (3), and case (4) show better performance, respectively, by 54.12; 54.08; 69.27, and 74.89% compared to the case of a smooth channel. The results also indicate that the thermal performance improvement factor is more significant in cases (3) and (4).

Keywords

Artificial roughness / CFD / Heat exchanger / Nusselt number / Friction factor

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