scholarly journals Computational Study of Flow and Heat Transfer With Anti Cross-Flows (ACF) Jet Impingement Cooling for Different Heights of Corrugate

2017 ◽  
Author(s):  
Radheesh Dhanasegaran ◽  
Ssheshan Pugazhendhi
Keyword(s):  
Heat Transfer ◽  
Skin Friction ◽  
Heat Transfer Performance ◽  
Computational Study ◽  
Three Dimensional ◽  
Cross Flow ◽  
Transfer Performance ◽  
Three Dimensional Flow ◽  
Dimensional Flow ◽  
Plate Spacing

In the present study, a flow visualization and heat transfer investigation is carried out computationally on a flat plate with 10×1 array of impinging jets from a corrugated plate. This corrugated structure is an Anti-Cross Flow (ACF) technique which is proved to nullify the negative effects of cross-flow thus enhancing the overall cooling performance. Governing equations are solved using k-ω Shear Stress Transport (SST) turbulence model in commercial code FLUENT. The parameter variation considered for the present study are (i) three different heights of ACF corrugate (C/D = 1, 2 & 3) and (ii) two different jet-to-target plate spacing (H/D = 1 & 2). The dependence of ACF structure performance on the corrugate height (C/D) and the flow structure has been discussed in detail, therefore choosing an optimum corrugate height and visualizing the three-dimensional flow phenomena are the main objectives of the present study. The three-dimensional flow separation and heat transfer characteristics are explained with the help of skin friction lines, upwash fountains, wall eddies, counter-rotating vortex pair (CRVP), and plots of Nusselt number. It is found that the heat transfer performance is high at larger corrugate heights for both the jet-to-plate spacing. Moreover, the deterioration of the skin friction pattern corresponding to the far downstream impingement zones is greatly reduced with ACF structure, retaining more uniform heat transfer pattern even at low H/D values where the crossflow effects are more dominant in case of the conventional cooling structure. In comparison of the overall heat transfer performance the difference between C/D = 3 & C/D = 2 for H/D = 2 is significantly less, thus making the later as the optimal configuration in terms of reduced channel height.

Heat and Mass Transfer in 3D Non-Newtonian Nano and Ferro Fluids over a Bidirectional Stretching Surface

2015 ◽  
Vol 21 ◽  
pp. 33-51 ◽  
Author(s):  
Chakravarthula S.K. Raju ◽  
Naramgari Sandeep
Keyword(s):  
Heat Transfer ◽  
Differential Equations ◽  
Friction Factor ◽  
Heat Transfer Performance ◽  
Three Dimensional ◽  
Transfer Performance ◽  
Stretching Surface ◽  
Three Dimensional Flow ◽  
Source Sink ◽  
Bidirectional Stretching

An analysis has been carried out for three-dimensional flow of magneto hydrodynamic Sisko ferro and nanofluids over a bidirectional stretching surface in porous medium with non-uniform heat source/sink. The set of nonlinear governing partial differential equations are transformed in to ordinary differential equations by using self-suitable transformations, and solved numerically using Runge-Kutta and Newton’s methods. The acquired results presents the effects of various non-dimensional governing parameters on velocity and temperature profiles. Also, determined and analyzed the friction factor coefficients and local Nusselt number. We have presented dual solutions for Sisko ferro and nanofluid cases. An excellent agreement of the present results has been found with existed literature under some special limited cases. Results depict that the material parameter have tendency to boost the friction factor coefficients along with the heat transfer rate. It is also observed that the heat transfer performance of Sisko nanofluid is high while compared with the heat transfer performance of the Sisko ferro fluid.

scholarly journals HEAT TRANSFER AT THE CROSS FLOW OF A TUBE WITH AN ARTIFICIAL ASYMMETRY

2017 ◽  
Vol 39 (4) ◽  
pp. 27-32
Author(s):  
A. A. Khalatov ◽  
G. V. Kovalenko ◽  
A. J. Meyris
Keyword(s):  
Heat Transfer ◽  
Computer Modeling ◽  
Experimental Research ◽  
Outer Surface ◽  
Three Dimensional ◽  
Cross Flow ◽  
Smooth Tube ◽  
Three Dimensional Flow ◽  
Dimensional Flow ◽  
The Right

An experimental research and computer modeling airflow and heat transfer of smooth tube and pipe with interceptors, mounted alternately on the right and on the left side of the outer surface, were performed. It was shown that the arrangement of an artificial three-dimensional flow leads to an intensification of heat transfer in the investigated range of flow velocities.  

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