Journal
POWDER TECHNOLOGY
Volume 360, Issue -, Pages 789-817Publisher
ELSEVIER
DOI: 10.1016/j.powtec.2019.10.055
Keywords
Sphere; Pulsatile flow; Frequency of pulsation; Power-law fluid; Nusselt number; Drag coefficient
Categories
Funding
- J C Bose fellowship (Science & Engineering Research Board, Department of Science and Technology, Government of India, New Delhi)
Ask authors/readers for more resources
The effect of pulsatile flow on the momentum and heat transfer characteristics for a sphere in power-law fluids is investigated numerically otherwise in the steady regime. Extensive results are presented in terms of streamlines, isotherms, pressure coefficient and local Nusselt number, drag coefficient and Nusselt number over the range of conditions as: Reynolds number (5 <= Re <= 120), Prandtl number (0.7 <= Pr <= 100), power-law index (0.3 <= n <= 1.5), frequency (pi/4 <= omega* <= pi) and amplitude of pulsations (0 <= A <= 0.8). The vortex grows during the deceleration phase of the pulsatile cycle and vice-versa. The pulsatile flow enhances heat transfer in shear-thinning fluids by 30% (at Re = 120, Pr = 100) over that of uniform flow conditions whereas the corresponding improvement is smaller than this value for shear-thickening fluids, i.e., n > 1. This is accompanied by a marginal increase in drag. (C) 2019 Elsevier B.V. All rights reserved.
Authors
I am an author on this paper
Click your name to claim this paper and add it to your profile.
Reviews
Recommended
No Data Available