Stagnation pressure

About: Stagnation pressure is a research topic. Over the lifetime, 2423 publications have been published within this topic receiving 37243 citations.

Stagnation flow towards a shrinking sheet

Abstract: The stagnation flow towards a shrinking sheet is studied. A similarity transform reduces the Navier–Stokes equations to a set of non-linear ordinary differential equations which are then integrated numerically. Both two-dimensional and axisymmetric stagnation flows are considered. It is found that solutions do not exist for larger shrinking rates and may be non-unique in the two-dimensional case. The non-alignment of the stagnation flow and the shrinking sheet complicates the flow structure. Convective heat transfer decreases with the shrinking rate due to an increase in boundary layer thickness.

Direct simulation of initial value problems for the motion of solid bodies in a Newtonian fluid. Part 2. Couette and Poiseuille flows

Abstract: This paper reports the results of a two-dimensional finite element simulation of the motion of a circular particle in a Couette and a Poiseuille flow. The size of the particle and the Reynolds number are large enough to include fully nonlinear inertial effects and wall effects. Both neutrally buoyant and non-neutrally buoyant particles are studied, and the results are compared with pertinent experimental data and perturbation theories. A neutrally buoyant particle is shown to migrate to the centreline in a Couette flow, and exhibits the Segre-Silberberg effect in a Poiseuille flow. Non-neutrally buoyant particles have more complicated patterns of migration, depending upon the density difference between the fluid and the particle. The driving forces of the migration have been identified as a wall repulsion due to lubrication, an inertial lift related to shear slip, a lift due to particle rotation and, in the case of Poiseuille flow, a lift caused by the velocity profile curvature. These forces are analysed by examining the distributions of pressure and shear stress on the particle. The stagnation pressure on the particle surface are particularly important in determining the direction of migration.

Elastico-viscous boundary-layer flows I. Two-dimensional flow near a stagnation point

Abstract: The Prandtl boundary-layer theory is extended for an idealized elastico-viscous liquid. The boundary-layer equations are solved numerically for the case of two-dimensional flow near a stagnation point. It is shown that the main effect of elasticity is to increase the velocity in the boundary layer and also to increase the stress on the solid boundary.

Experimental study of compressible turbulent mixing layers

Abstract: Compressible, turbulent mixing layers have been investigated experimentally using pressure mesurements, Schlieren photographs, and velocity measurements with a two-component laser Doppler velocimeter system. Seven mixing-layer cases were examined, with relative Mach numbers ranging from 0.40 to 1.97 which spans the region of significant compressibility effects. Both the spatial development and similarty of the mixing layers were considered.

Stagnation point flow with Cattaneo-Christov heat flux and homogeneous-heterogeneous reactions

Abstract: This article addresses the impact of Cattaneo-Christov heat flux in the stagnation point flow of rate type fluid towards a nonlinear stretching surface with variable thickness. Maxwell fluid of variable thermal conductivity is employed in the modeling and analysis. Influence of homogeneous and heterogeneous reactions is further considered. The relevant problems are formulated by employing continuity, linear momentum and energy equations. The convergent solutions of the resulting problems are constructed. The velocity, temperature and concentration distribution are examined for various pertinent variables. Contribution of thermal relaxation is explicitly pointed out. It is observed that temperature distribution decays for higher values of thermal relaxation parameter.