Universiti Teknologi Malaysia Institutional Repository

The unsteady boundary layer flow past a circular cylinder in micropolar fluids

Ali, Anati and Amin, Norsarahaida and Pop, Ioan (2007) The unsteady boundary layer flow past a circular cylinder in micropolar fluids. International Journal of Numerical Methods for Heat & Fluid Flow, 17 (7). pp. 692-714. ISSN 0961-5539

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Official URL: http://dx.doi.org/10.1108/09615530710777967


Purpose – The purpose of this paper is to study the unsteady boundary layer flow of a micropolar fluid past a circular cylinder which is started impulsively from rest. Design/methodology/approach – The nonlinear partial differential equations consisting of three independent variables are solved numerically using the 3D Keller-box method. Findings – Numerical solutions for the velocity profiles, wall skin friction and microrotation profiles are obtained and presented for various values of time t and material parameter K with the boundary condition for microrotation n=0 (strong concentration of microelements) and n=1/2 (weak concentration of microelements). The results are presented along the points on the cylinder surface, starting from the forward to the rear stagnation point, for small time up to the time when the boundary layer flow separates from the cylinder. Originality/value – It is believed that this is the first paper that uses the 3D Keller-box method to study the unsteady boundary layer flow of micropolar fluids. In the last four decades, there has been overhelming interest shown by researchers in micropolar fluids and still many problems are unsolved. The paper shows not only the fundamental importance of this problem, but also the implications for situations of practical interest.

Item Type:Article
Uncontrolled Keywords:Boundary layers; fluid phenomena; turbulent flow.
Subjects:Q Science > QA Mathematics
ID Code:8816
Deposited On:13 May 2009 04:31
Last Modified:13 May 2009 04:31

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