Entropy generation in a porous annulus due to micropolar fluid flow with slip and convective boundary conditions. (15th September 2016)

• Record Type: Journal Article
• Authors: Srinivasacharya, D.; Bindu, K. Hima
• Is Part Of: Energy. Volume 111(2016)
• Page Start: 165
• Page End: 177
• Publication Date: 2016-09-15
• Subjects: Concentric cylinders -- Micropolar fluid -- Slip -- Convective boundary -- Magnetic field -- Entropy -- Bejan number; Power resources -- Periodicals; Power (Mechanics) -- Periodicals; Energy consumption -- Periodicals; 333.7905
• DOI: 10.1016/j.energy.2016.05.101
• Languages: English
• ISSNs: 0360-5442

Abstract

Abstract: A numerical work has been performed to study the entropy generation of micropolar fluid flow and heat transfer in an annulus with porous walls under the transverse magnetic field associated with slip and convective boundary conditions. Assume that the injection velocity at one wall is same as the suction velocity at the other wall. The governing equations of the fluid flow are linearized using quasilinearisation method and further, solved by the Chebyshev spectral collocation method. The numerical data for velocity, microrotation and temperature fields are used to evaluate entropy generation and Bejan number. It has been found that the maximum entropy generation is observed at the inner cylinder and minimum entropy generation is observed at the outer cylinder. Also entropy generation increases with increase in coupling number, Hartman number, cross flow Reynolds number, Biot number and Brinkman number. Whereas it reduces with increase in slip parameter. Highlights: Entropy generation through porous annulus with slip, convective condition is analyzed. Solutions are obtained numerically by applying spectral quasilinearization method. As microrotation parameter increases, velocity, temperature, entropy rate increase. Velocity, temperature and entropy reduces with increase in slip parameter. An increase in Brinkman number enhances the temperature, entropy and Bejan number.