Investigation of second law of thermodynamics for Giesekus fluid in rotating cylinders annulus at different imposed fluxes

The second laws of thermodynamics is investigated for a nonlinear viscoelastic fluid obeyingGiesekus constitutive equation. An annulus with both rotated cylinders is considered and a pureanalytical solution is presented. The uniform heat flux imposed on the both cylinders but fluxescan be equal or unequal. The effect of viscose dissipation, elasticity, velocity ratio and ratio ofouter to inner wall heat fluxes are analysed. Results indicate the viscose dissipation increase theentropy generation but elasticity has opposite effect and also more entropy is generated whenthe inner wall heat flux is higher than the outer wall heat flux.

کلیدواژه ها:

Giesekus Model ، Entropy generation number ، Bejan number ، Heat flux ، rotated cylinders.