THERMAL SCIENCE

International Scientific Journal

Zia Ullah

,

Muhammad Ashraf

,

Saqib Zia

,

Ishtiaq Ali

SURFACE TEMPERATURE AND FREE-STREAM VELOCITY OSCILLATION EFFECTS ON MIXED CONVENTION SLIP FLOW FROM SURFACE OF A HORIZONTAL CIRCULAR CYLINDER

ABSTRACT
The present phenomena address the slip velocity effects on mixed convection flow of electrically conducting fluid with surface temperature and free stream velocity oscillation over a non-conducting horizontal cylinder. To remove the difficulties in illustrating the coupled PDE, the primitive variable formulation for finite dif­ference technique is proposed to transform dimensionless equations into primitive form. The numerical simulations of coupled non-dimensional equations are exam­ined in terms of fluid slip velocity, temperature, and magnetic velocity which are used to calculate the oscillating components of skin friction, heat transfer, and cur­rent density for various emerging parameters magnetic force parameter, ξ, mixed convection parameter, λ, magnetic Prandtl number, γ, Prandtl number, and slip factor, SL. It is observed that the effect of slip flow on the non-conducting cylinder is reduced the fluid motion. A minimum oscillating behavior is noted in skin friction at each position but maximum amplitude of oscillation in heat transfer is observed at each position α = π/4 and 2π/3. It is further noticed that a fluid velocity increas­es sharply with the impact of slip factor on the fluid-flow mechanism. Moreover, due to frictional forces with lower magnitude between viscous layers, the rise in Prandtl number leads to decrease in skin fiction and heat transfer which is physi­cally in good agreement.
KEYWORDS
mixed-convection, oscillatory slip-flow, non-conducting cylinder, slip velocity, current density
PAPER SUBMITTED: 2020-04-10
PAPER REVISED: 2020-05-17
PAPER ACCEPTED: 2020-05-25
PUBLISHED ONLINE: 2020-10-25
DOI REFERENCE: https://doi.org/10.2298/TSCI20S1013U
CITATION EXPORT: view in browser or download as text file
THERMAL SCIENCE YEAR 2020, VOLUME 24, ISSUE Supplement 1, PAGES [S13 - S23]
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Surface temperature and free-stream velocity oscillation effects on mixed convention slip flow from surface of a horizontal circular cylinder

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