Similarity solutions for two-dimensional magnetogasdynamic boundary layer flow in a transverse magnetic field

This paper is concerned with the structure of steady two–dimensional flow inside the viscous sublayer in hypersonic boundary–layer flow over a flat surface in which microscopic cavities (‘microcavities’) are embedded. Such a so–called Ultra Absorptive Coating (UAC) has been predicted theoretically [1] and demonstrated experimentally [2] to stabilize passively hypersonic boundary–layer flow. In an effort to further quantify the physical mechanism leading to flow stabilization, this paper focuses on the nature of the basic flows developing in the configuration in question. Direct numerical simulations are performed, addressing firstly steady flow inside a singe microcavity, driven by a constant shear, and secondly a model of a UAC surface in which the two–dimensional boundary layer over a flat plate and a minimum nontrivial of two microcavities embedded in the wall are solved in a coupled manner. The influence of flow– and geometric parameters on the obtained solutions is illustrated. Based on the results obtained, the limitations of currently used theoretical methodologies for the description of flow instability are identified and suggestions for the improved prediction of the instability characteristics of UAC surfaces are discussed.

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Singular perturbation and differential transform methods to two-dimensional flow of nanofluid in a porous channel with expanding/contracting walls subjected to a uniform transverse magnetic field

Thermal Science and Engineering Progress ◽

10.1016/j.tsep.2017.09.001 ◽

2017 ◽

Vol 4 ◽

pp. 71-84 ◽

Cited By ~ 4

Author(s):

M.G. Sobamowo

Keyword(s):

Magnetic Field ◽

Singular Perturbation ◽

Transverse Magnetic Field ◽

Transverse Magnetic ◽

Porous Channel ◽

Two Dimensional ◽

Transform Methods ◽

Dimensional Flow ◽

Differential Transform ◽

Two Dimensional Flow

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THERMAL RADIATION EFFECT ON MHD NATURAL CONVECTION BOUNDARY LAYER FLOW OVER A PLATE WITH SUCTION (INJECTION) AND VARIABLE VISCOSITY

International Journal of Research -GRANTHAALAYAH ◽

10.29121/granthaalayah.v5.i4rast.2017.3303 ◽

2017 ◽

Vol 5 (4RAST) ◽

pp. 52-58

Author(s):

Jalaja P ◽

Venkataramana B.S ◽

Naveen V ◽

K.R. Jayakumar

Keyword(s):

Magnetic Field ◽

Boundary Layer ◽

Natural Convection ◽

Thermal Radiation ◽

Boundary Layer Flow ◽

Variable Viscosity ◽

Convection Boundary Layer ◽

Implicit Finite Difference Scheme ◽

Convection Boundary ◽

Layer Flow

The effect of thermal radiation on steady natural convection boundary layer flow over a plate with variable viscosity and magnetic field has been studied in this paper. The effect of suction and injection is also considered in the investigation. The system of partial differential equations governing the nonsimilar flow has been solved numerically using implicit finite difference scheme along with a quasilinearization technique. The thermal radiation has significant effect on heat transfer coefficient and thermal transport in presence of viscosity variation parameter and magnetic field in case of suction and injection.

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