Second law analysis of Giesekus viscoelastic fluid for axial annular flow
by Mehdi Moayed Mohseni; Fariborz Rashidi
International Journal of Exergy (IJEX), Vol. 16, No. 4, 2015

Abstract: The first and second laws of thermodynamics are analysed for viscoelastic fluid obeying Giesekus constitutive equation in concentric annulus under steady, laminar flow with both thermal and hydrodynamic fully developed conditions. Two types of boundary conditions are employed in this study. (a) Uniform heat flux is imposed at outer cylinder and insulated condition is considered for inner cylinder. (b) Both cylinders are kept at different constant temperatures. Governing equations in cylindrical coordinate system are simplified and then solved to obtain analytical expressions for temperature profile (Θ), entropy generation number (NS) and Bejan number (Be). The effect of group parameter (Br/Ω), Brinkman number (Br), Deborah number (De) and mobility factor (α) are discussed. Results indicate that entropy generation decreases with increasing De and α while an increase in Br and Br/Ω cause increase in the entropy generation.

Online publication date: Tue, 28-Apr-2015

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