Abstract
This paper provides numerical estimation of Newtonian fluid flow past through rectangular channel fixed with screen movable from 10° to 45° by increasing the Reynolds number from 1000 to 10,000. The two-dimensional incompressible Navier Stokes equations are worked out making use of the popular software COMSOL MultiPhysics version 5.4 which implements the Galerkin’s least square scheme to discretize the governing set of equations into algebraic form. In addition, the screen boundary condition with resistance coefficient (2.2) along with resistance coefficient 0.78 is implemented along with slip boundary conditions applied on the wall. We engaged to find and observe the relationship between the optimum velocity, drag force applied by the screen, and pressure occurred in the channel with increasing Reynolds number. Because of the linear relationship between the optimum velocities and the Reynolds number, applying the linear regression method, we will estimate the linear equation so that future prediction and judgment can be done. The validity of results is doing with the asymptomatic solution for stream-wise velocity at the outlet of the channel with screens available in the literature. A nondimensional quantity, i.e., ratio from local to global Reynolds number Re x / Re , is introduced which found stable and varies from -0.5 to 0.5 for the whole problem. Thus, we are in the position to express the general pattern of the velocity of the particles as well as the pressure on the line passing through the middle of the channel and depart some final conclusion at the end.
Highlights
The screens are commonly used in the gauze machines of the air crafts and electronic elements like air conditions, air cooler, and fans, to transmit the air or turning down the heat into the medium by speeding the fluid flow
The calculations of the drag force applied by the screen and the velocity as well as the pressure on the average line at the middle of the channel have expressed in terms of the ratio from local to global Reynolds numbers are presented with graphs
For a particular Reynolds number, it is perceived via the surface plot; the velocity of the fluid particles after the screen is further increasing in magnitude and behaves not far from the down side of the outlet of the channel
Summary
The screens are commonly used in the gauze machines of the air crafts and electronic elements like air conditions, air cooler, and fans, to transmit the air or turning down the heat into the medium by speeding the fluid flow. The speed, pressure, and drag forces once the fluid of any type turns up into the area are the foremost problem in the field of engineering sciences. In order to develop the perfect design for an engineering tool, it is the best to perceive the flow distribution among the channels with screens. This problem will help the researchers or scientists to understand the mechanism of optimized velocity and pressure connected with Reynolds number while performing the experiment of flow through the screens and a general pattern of the velocity of the particles and the pressure with respect to the local to global ratio of the Reynolds numbers
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