scholarly journals A Stability of Force Convection Boundary Layer Laminar flow in Diverging Chennal

2019 ◽  
Vol 8 (12) ◽  
pp. 4281-4284
Keyword(s):  
Boundary Layer ◽  
Vertical Plate ◽  
Force Convection ◽  
Convection Boundary Layer ◽  
Governing Equations ◽  
Step Size ◽  
Mass Transfer Parameter ◽  
Injection Parameter ◽  
Convection Boundary ◽  
Dimensional Boundary

The objective of this paper works is to study, a stability analysis of two dimensional boundary layer forced convection over a fixed vertical plate vary in viscosity and prandtl number with time dependent . The governing equations are transformed to non linear coupled partial differential equations with boundary conditions have been solved numerically by finite difference scheme in combination with quasi-linearization technique with suitable step size along the stream- wise direction. Results are showed different values of mass transfer parameter (A) . It was found that the solutions is stable when increases the suction/injection parameter A.

Experimental Investigation of Turbulence Transition of Natural Convection Boundary Layer Along a Vertical Plate in Water With Sub-Millimeter-Bubble Injection

2011 ◽  
Author(s):  
Atsuhide Kitagawa ◽  
Hiroki Endo ◽  
Yoshimichi Hagiwara
Keyword(s):  
Boundary Layer ◽  
Experimental Investigation ◽  
Natural Convection ◽  
Velocity Fluctuation ◽  
Vertical Plate ◽  
Liquid Velocity ◽  
Convection Boundary Layer ◽  
Layer Width ◽  
Turbulence Transition ◽  
Convection Boundary

This paper presents an experimental investigation of the turbulence transition of the natural convection boundary layer along a vertical plate in water with sub-millimeter-bubble injection. In this study, we focus on the relationship between the bubble injection position L and the turbulence transition of the boundary layer. Temperature and velocity measurements show that sub-millimeter-bubble injection for L = 1.6 mm suppresses the turbulence transition of the natural convection boundary layer, while that for L = 3.6 mm enhances the turbulence transition of the boundary layer. For L = 1.6 mm, the appearance region of the bubble-induced liquid velocity fluctuation at the upstream unheated section is restricted near the wall, though the peak value of the liquid velocity fluctuation is high. In contrast, in the case of L = 3.6 mm, the relatively large liquid velocity fluctuation induced by bubbles at the upstream unheated section distributes widely over the laminar boundary layer width. Therefore, we expect that the turbulence transition of the natural convection boundary layer for the case with bubble injection depends on the magnitude and appearance region of the bubble-induced liquid velocity fluctuation at the upstream unheated section.

scholarly journals Separation Points of Magneto-hydrodynamic Boundary Layer Flow Along a Vertical Plate with Exponentially Decreasing Free Stream Velocity

1970 ◽  
Vol 5 (1) ◽  
pp. 11-18 ◽  
Author(s):  
MA Alim ◽  
MM Rahman ◽  
MM Karim
Keyword(s):  
Magnetic Field ◽  
Boundary Layer ◽  
Vertical Plate ◽  
Free Stream ◽  
Stream Velocity ◽  
Convection Boundary Layer ◽  
Boundary Layer Equations ◽  
Box Scheme ◽  
Convection Boundary ◽  
Layer Flow

The points of separation of magneto-hydrodynamic mixed convection boundary layer flow along a vertical plate have been investigated. The free stream velocity is considered decreasing exponentially in the stream wise direction. The governing boundary layer equations are transformed into a non-dimensional form and the resulting nonlinear system of partial differential equations are reduced to local non-similar boundary layer equations, which are solved numerically by implicit finite difference method known as Keller box scheme. Here we have focused our attention to find the effects of suction, magnetic field and other relevant physical parameters on the position of boundary layer separation. The numerical results are expressed in terms of local shear stress showing the effects of suction, buoyancy, Prandlt number and magnetic field on the shear stress as well as on the points of separation. Keywords: Separation points, magneto-hydrodynamic, mixed convection, boundary layer, suction, finite difference method, Keller box scheme.   doi:10.3329/jname.v5i1.1868Journal of Naval Architecture and Marine Engineering Vol. 5, No. 1 (June, 2008) 11-18. 

Sign in / Sign up

Export Citation Format

Share Document