The entropy generation for a rotating sphere under uniform heat flux boundary condition in forced-convection flow

• Published in: International journal of numerical methods for heat & fluid flow Vol. 19; no. 3/4; pp. 396 - 410
• Main Authors: Antar, Mohamed A, El-Shaarawi, Maged A.I
• Format: Journal Article
• Language: English
• Published: Bradford Emerald Group Publishing Limited 15.05.2009
• Subjects: Boundary conditions; Boundary layer; Entropy; Friction; Heat conductivity; Heat transfer; Investigations; Navier-Stokes equations; Reynolds number; Shear stress; Spheres; Studies; Thermodynamics; Velocity; Viscosity; Thermodynamic properties; Rotational motion; Boundary layers; Heat transfer; Flow
• ISSN: 0961-5539; 1758-6585
• DOI: 10.1108/09615530910938344

Purpose - The purpose of this paper is to investigate the problem of entropy generation around a spinning non-spinning solid sphere subjected to uniform heat flux boundary condition in the forced-convection regime.Design methodology approach - The governing continuity, momentum, energy and entropy generation equations are numerically solved for a wide range of the controlling parameters; Reynolds number and the dimensionless spin number.Findings - The dimensionless overall total entropy generation increases with the dimensionless spin number. The effect of increasing the spin number on the fluid-friction component of entropy generation is more significant compared to its effect on heat transfer entropy generation.Research limitations implications - Since the boundary-layer analysis is used, the flow is presented up to only the point of external flow separation.Practical implications - Entropy generation analysis can be used to evaluate the design of many heat transfer systems and suggest design improvements.Originality value - A review in the open literature indicated that no study is available for the entropy generation in the unconfined flow case about a spinning sphere.