Engineering

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Simulation Of Turbulent Flows Through a Solar Air Heater

Conventional solar air heaters have poor thermal efficiency due to low-convective heat transfer coefficient between absorber plate and flowing air stream. It can be increased by increasing the level of turbulence by breaking laminar viscous sublayer. For this purpose artificial roughness are applied on the surface of absorber plate to enhance heat transfer by passive technique.

The enhancement in heat transfer accompanies higher pressure drop of the fluid flow. In order to keep friction losses at a low level, the turbulence must be created in the region close to the duct surface, that is, in the laminar sublayer.

 

Objective:

The objective of this study is to observe the heat transfer enhancement using Square-Sectioned artificial roughness on the absorber plate of the Solar Air Heater (SAH) and to evaluate the effect on Average Nusselt Number and Average Friction Factor.                                

 

 

Use Of Artificial Roughness

 

 Modeing Of 2 D Solar Air Heater

 

Geometry Of 2 D Solar Air Heater

 

Meshing

 

Boundary Conditions Of Solar Air Heater

 

 Velocity T.I Calculation Corresponding to Reynolds Number

 

 Turbulence Model For Solar Air Heater 2D

 

Reuslts Of 2D Solar Air Heater

 

Nusselt Number Variation Of 2D Solar Air Heater

 

Friction Fator Of 2D Solar Air Heater

 

TKE Contour Result 2D Solar Air Heater

 

Velocity Contour Result 2D Solar Air Heater

 

Pressure Contour Result 2D Solar Air Heater

 

Temperature Contour Result 2D Solar Air Heater

 

Conclusion