Abstract
Most industrial fluids such as polymers, liquid crystals, and colloids contain suspensions of rigid particles that undergo rotation. However, the classical Navier-Stokes theory normally associated with Newtonian fluids is inadequate to describe such fluids as it does not take into account the effects of these microstructures. In this paper, the unsteady mixed convection boundary layer flow of a micropolar fluid past an isothermal horizontal circular cylinder is numerically studied, where the unsteadiness is due to an impulsive motion of the free stream. Both the assisting (heated cylinder) and opposing cases (cooled cylinder) are considered. Thus, both small and large time solutions as well as the occurrence of flow separation, followed by the flow reversal are studied. The flow along the entire surface of a cylinder is solved numerically using the Keller-box scheme. The obtained results are compared with the ones from the open literature, and it is shown that the agreement is very good.
Highlights
The unsteady nature of a wide range of fluid flows of practical importance has received considerable attention in recent years
The fluid dynamic aspects of some of these problems can normally be approximated by small departures from steady behavior, and some cannot
It is worth mentioning that the problem of steady mixed convection boundary layer flow past an isothermal circular cylinder in a Newtonian fluid, when the an impulsive motion of the free stream
Summary
The unsteady nature of a wide range of fluid flows of practical importance has received considerable attention in recent years. It is worth mentioning that the problem of steady mixed convection boundary layer flow past an isothermal circular cylinder in a Newtonian fluid, when the an impulsive motion of the free stream.
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