Study of the Laminar Free-Convection Wake Above an Isothermal Vertical Plate

1973 ◽  
Vol 95 (3) ◽  
pp. 289-294 ◽  
Author(s):  
N. E. Hardwick ◽  
E. K. Levy
Keyword(s):  
Free Convection ◽  
Vertical Plate ◽  
Fluid Motion ◽  
Heated Plate ◽  
Two Dimensional ◽  
Wake Region ◽  
Hot Wire ◽  
Near Wake ◽  
Steady Laminar ◽  
Finite Difference Techniques

The steady, laminar, two-dimensional wake above a thin vertical isothermal heated plate cooled by free convection was investigated theoretically and experimentally. The system of partial differential equations governing the fluid motion and heat transfer in the vicinity of the plate and in the near wake region was formulated and solved using finite difference techniques. Using air, the temperature and velocity profiles in the wake region were measured experimentally using a laser holographic interferometer and a constant temperature hot wire anemometer.

The effect of base bleed on the steady separated flow past bluff objects

1969 ◽  
Vol 39 (4) ◽  
pp. 735-752 ◽  
Author(s):  
L. G. Leal ◽  
A. Acrivos
Keyword(s):  
Bluff Body ◽  
Separated Flow ◽  
Pressure Profile ◽  
Reynolds Numbers ◽  
Two Dimensional ◽  
Wake Region ◽  
Near Wake ◽  
Flow Past ◽  
Modifying Effect ◽  
Base Bleed

The modifying effect of base bleed on the steady separated flow past a two-dimensional bluff body is considered. Detailed experimental results are presented for Reynolds numbers R between 50 and 250 and for bleed coefficients b in the range 0 to 0·15. The streamline pattern near the object is found to be strongly affected by small changes in the rate of bleed, with the recirculating closed wake disappearing altogether for b > 0·15. Nevertheless, the qualitative dependence on R of the physical dimensions of the near-wake region and the associated streamwise pressure profile appear to be unaffected by base bleed.

scholarly journals A Study of Two Dimensional Unsteady MHD Free Convection Flow over a Vertical Plate

2020 ◽  
Vol 10 (04) ◽  
pp. 342-355
Author(s):  
Absana Tarammim ◽  
Mohammad Sharif Ullah ◽  
Mohammed Jahir Uddin
Keyword(s):  
Free Convection ◽  
Vertical Plate ◽  
Convection Flow ◽  
Two Dimensional ◽  
Free Convection Flow

Radiative and Porous Effects on Free Convection Flow near a Vertical Plate that Applies Shear Stress to the Fluid

2013 ◽  
Vol 68 (1-2) ◽  
pp. 130-138 ◽  
Author(s):  
Corina Fetecau ◽  
Mehwish Rana ◽  
Constantin Fetecau
Keyword(s):  
Shear Stress ◽  
Free Convection ◽  
Viscous Fluid ◽  
Thermal Radiation ◽  
Vertical Plate ◽  
Fluid Motion ◽  
Convection Flow ◽  
Free Convection Flow ◽  
Special Cases ◽  
Infinite Vertical Plate

General solutions for the unsteady free convection flow of an incompressible viscous fluid due to an infinite vertical plate that applies a shear stress f (t) to the fluid are established when thermal radiation and porous effects are taken into consideration. They satisfy all imposed initial and boundary conditions and can generate a large class of exact solutions corresponding to different motions with technical relevance. The velocity is presented as a sum of thermal and mechanical components. Finally, some special cases are brought to light, and effects of pertinent parameters on the fluid motion are graphically underlined.

Topology-induced effect in biomimetic propulsive wakes

2013 ◽  
Vol 729 ◽  
pp. 377-387 ◽  
Author(s):  
V. Raspa ◽  
R. Godoy-Diana ◽  
B. Thiria
Keyword(s):  
Cross Section ◽  
Vortex Shedding ◽  
Pressure Effect ◽  
Two Dimensional ◽  
Wake Region ◽  
Near Wake ◽  
Vortex Pairs ◽  
Spatial Ordering ◽  
Precise Experiment

AbstractIt is known that the wake pattern observed in a cross-section behind swimming or flying animals is typically characterized by the presence of periodical vortex shedding. However, depending on species, propulsive wakes can differ according to the spatial ordering of the main vortex structures. We conducted a very precise experiment to analyse the role of the topology of the wake in the generation of propulsion by comparing two prototypical cases in a quasi-two-dimensional view. One configuration is jellyfish-like, with symmetric shedding of vortex pairs, and the other is fish-like, with alternating shedding of counter-rotating vortices. Self-propulsion is achieved by the flapping motion of two identical pitching rigid foils, separated by a distance $d$. By keeping the momentum input unchanged, we compared both symmetric and asymmetric flapping modes. For the entire explored range of parameters, the symmetric jellyfish-like mode has shown to produce more thrust than the fish-like asymmetrical one. We show here that this difference is due to a pressure effect related to the ability of each wake to produce or not, strong fluctuations of transversal velocities in the near-wake region.

Laminar Free-Convection Wake Above a Heated Vertical Plate

1964 ◽  
Vol 31 (1) ◽  
pp. 131-138 ◽  
Author(s):  
Kwang-Tzu Yang
Keyword(s):  
Free Convection ◽  
Boundary Layers ◽  
Vertical Plate ◽  
Asymptotic Series ◽  
Integral Solution ◽  
Series Expansions ◽  
Temperature Profiles ◽  
Wake Region ◽  
Laminar Wake ◽  
Prandtl Numbers

The development of momentum and energy fields in the laminar-wake region above a heated finite vertical plate is studied analytically. Detailed velocity and temperature profiles in the immediate neighborhood of the trailing edge of the plate are calculated for two Prandtl numbers by means of asymptotic series expansions. These results are then continued to the rest of the wake region by an integral solution. It is found that the spreading of the boundary layers is rather gradual.

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