Numerical Simulation of the Intensification of the Heat Exchange in a Plane-Parallel Channel with a Cylindrical Shallow Dimple on the Heated Wall

• Published in: Journal of engineering physics and thermophysics Vol. 89; no. 5; pp. 1186 - 1201
• Main Authors: Isaev, S. A., Leontiev, A. I., Baranov, P. A., Popov, I. A., Shchelchkov, A. V., Gabdrakhmanov, I. P.
• Format: Journal Article
• Language: English
• Published: New York Springer US 01-09-2016; Springer
• Subjects: Amplification; Analysis; Channels; Classical Mechanics; Complex Systems; Computational fluid dynamics; Dimpling; Engineering; Engineering Thermodynamics; Heat and Mass Transfer; Heat exchange; Hydrogasdynamics in Technological Processes; Industrial Chemistry/Chemical Engineering; Numerical analysis; Thermodynamics; Turbulence; Turbulent flow; Walls; intensification of heat exchange; cylindrical and spherical dimples; intersecting structured meshes; narrow plane-parallel channel; multiblock computational technologies
• ISSN: 1062-0125; 1573-871X
• DOI: 10.1007/s10891-016-1482-9

A comparison of the results of numerical calculations of the convective heat exchange in narrow plane-parallel channels with shallow cylindrical and spherical dimples on their wall heated by a constant heat flow under the conditions of low-velocity turbulent water flow in a channel at Re = 20,000 has been performed. Hydrodynamic features of the vortex intensification of the heat exchange in the indicated channels as a result of the interaction of the swirling flows in them with the side walls of a dimple were determined. The thermal and thermohydraulic efficiencies of a shallow cylindrical dimple were estimated. It is shown that this dimple offers substantial advantages over a spherical dimple of the same depth.