scholarly journals Effect of mass transfer and chemical reaction on three dimensional flow through porous medium with heat transfer and heat source

2020 ◽  
Author(s):  
N. Niranjana ◽  
M. Vidhya ◽  
A. Govindarajan ◽  
A. Mohamad Rashad
Keyword(s):  
Heat Transfer ◽  
Mass Transfer ◽  
Porous Medium ◽  
Heat Source ◽  
Chemical Reaction ◽  
Three Dimensional ◽  
Three Dimensional Flow ◽  
Dimensional Flow ◽  
Flow Through

Turbulent Transport on the Endwall in the Region Between Adjacent Turbine Blades

1988 ◽  
Vol 110 (4a) ◽  
pp. 862-869 ◽  
Author(s):  
R. J. Goldstein ◽  
R. A. Spores
Keyword(s):  
Heat Transfer ◽  
Mass Transfer ◽  
Turbine Blade ◽  
Transport Coefficients ◽  
Accurate Determination ◽  
Three Dimensional ◽  
Local Heat Transfer ◽  
Local Heat ◽  
Three Dimensional Flow ◽  
Dimensional Flow

The complex three-dimensional flow in the endwall region near the base of a turbine blade has an important impact on the local heat transfer. The initial horseshoe vortex, the passage vortex, and resulting corner vortices cause large variations in heat transfer over the entire endwall region. Due to these large surface gradients in heat transfer, conventional measurement techniques generally do not provide an accurate determination of the local heat transfer coefficients. In the present study, the heat/mass transfer analogy is used to examine the local transport coefficients for two different endwall boundary layer thicknesses and two free-stream Reynolds numbers. A linear turbine blade cascade is used in conjunction with a removable endwall plate. Naphthalene (C10H8) is cast into a mold on the plate and the rate of naphthalene sublimation is determined at 6000 + locations on the simulated endwall by employing a computer-aided data acquisition system. This technique allows one to obtain detailed contour plots of the local convection coefficient over the entire endwall. By examining the mass transfer contours, it is possible to infer information on the three-dimensional flow in the passage between the blades. Extremely high transport coefficients on the endwall indicate locations of potential overheating and failure in an actual turbine.

Soret and Dufour effects in three-dimensional flow of Maxwell fluid with chemical reaction and convective condition

2015 ◽  
Vol 25 (1) ◽  
pp. 98-120 ◽  
Author(s):  
T. Hayat ◽  
M. Bilal Ashraf ◽  
A. Alsaedi ◽  
M. S. Alhothuali
Keyword(s):  
Mass Transfer ◽  
Chemical Reaction ◽  
Sherwood Number ◽  
Three Dimensional ◽  
Maxwell Fluid ◽  
Three Dimensional Flow ◽  
Soret And Dufour Effects ◽  
Content Type ◽  
Dimensional Flow ◽  
First Order Chemical Reaction

Purpose – The purpose of this paper is to address the heat and mass transfer effects in three-dimensional flow of Maxwell fluid over a stretching surface with convective boundary conditions. Mass transfer is considered in the presence of first order chemical reaction. Conservation laws of energy and concentration are based upon the Soret and Dufour effects. Convergent series solutions to the resulting non-linear problems are developed. Effects of Biot and Deborah numbers on the Sherwood number are decreasing. Local Nusselt reduces with an increase in Eckert numbers. It is also interesting to note further that variations of Prandtl and Biot numbers on the Nusselt number are increasing while Sherwood number decreases with an increase in Prandtl number. Design/methodology/approach – The involved partial differential systems are reduced to the ordinary differential systems using appropriate transformations. Series solutions by homotopy analysis method are constructed and analyzed. Graphical results are presented and examined in detail. Findings – It is found that roles of Deborah and Biot parameters on the Nusselt number are opposite. However, the Sherwood number is qualitative similar for both Biot and Deborah numbers. It is also interesting to note further that variations of Prandtl and Biot numbers on the Nusselt and Sherwood numbers are similar. Originality/value – The purpose of present communication is to investigate the three-dimensional flow of Maxwell fluid over a stretching surface with convective condition. Analysis has been carried out in the presence of mass transfer with first order chemical reaction and Soret and Dufour effects.

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