THERMAL SCIENCE

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Abe-El Aziz

,

M. Salem

,

Rania Fathy

EFFECT OF VARIABLE VISCOSITY AND SUCTION/INJECTION ON THERMAL BOUNDARY LAYER OF A NON-NEWTONIAN POWER-LAW FLUIDS PAST A POWER-LAW STRETCHED SURFACE

ABSTRACT
The analysis of laminar boundary layer flow and heat transfer of non-Newtonian fluids over a continuous stretched surface with suction or injection has been presented. The velocity and temperature of the sheet were assumed to vary in a power-law form, that is u = U0xm, and Tw(x)=T4+Cxb. The viscosity of the fluid is assumed to be inverse linear function of temperature. The resulting governing boundary-layer equations are highly non-linear and coupled form of partial differential equations and they have been solved numerically by using the Runge-Kutta method and Shooting technique. Velocity and temperature distributions as well as the Nusselt number where studied for two thermal boundary conditions: uniform surface temperature (b = 0) and cooled surface temperature (b = -1), for different parameters: variable viscosity parameter θ, temperature exponent b, blowing parameter d and Prandtl number. The obtained results show that the flow and heat transfer characteristics are significantly influenced by these parameters.
KEYWORDS
variable viscosity, heat transfer, non-Newtonian power-law fluids, stretching sheet
PAPER SUBMITTED: 2009-07-13
PAPER REVISED: 2009-07-24
PAPER ACCEPTED: 2009-11-19
DOI REFERENCE: https://doi.org/10.2298/TSCI1004111S
CITATION EXPORT: view in browser or download as text file
THERMAL SCIENCE YEAR 2010, VOLUME 14, ISSUE Issue 4, PAGES [1111 - 1120]
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Effect of variable viscosity and suction/injection on thermal boundary layer of a non-newtonian power-law fluids past a power-law stretched surface

© 2024 Society of Thermal Engineers of Serbia. Published by the Vinča Institute of Nuclear Sciences, National Institute of the Republic of Serbia, Belgrade, Serbia. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution-NonCommercial-NoDerivs 4.0 International licence