Optimization of Pin-Fin Heat Sinks in Bypass Flow Using Entropy Generation Minimization Method (original) (raw)

A General Equation Based on Entropy Generation Minimization to Optimize Plate Fin Heat Sink

2018

In the present study, a new method based on entropy generation minimization was proposed to optimize plate fin heat sink. It is clear that the design of a heat sink is not straightforward and needs some secondary equations. Therefore, in the present study, dimensionless forms of equations were presented first and the effect of each dimensionless group on the entropy generation rate was studied deeply. Finally, a semi-analytical equation was proposed to relate dimensionless thickness to dimensionless fin height and Bi number as well. Interestingly, since no restricting assumption was made during derivation, this equation can be used for both natural and forced convection. Moreover, this equation is based on dimensionless parameters, so it is not limited to some specific geometries or working conditions. At the end, six examples showed benefits and ease of use of this equation. A fan curve was also used in optimizing a heat sink which is more realistic than using a specified free stream velocity.

The Role of Fin Geometry in Heat Sink Performance

Journal of Electronic Packaging, 2006

The following study will examine the effect on overall thermal/fluid performance associated with different fin geometries, including, rectangular plate fins as well as square, circular, and elliptical pin fins. The use of entropy generation minimization, EGM, allows the combined effect of thermal resistance and pressure drop to be assessed through the simultaneous interaction with the heat sink. A general dimensionless expression for the entropy generation rate is obtained by considering a control volume around the pin fin including base plate and applying the conservations equations for mass and energy with the entropy balance. The formulation for the dimensionless entropy generation rate is developed in terms of dimensionless variables, including the aspect ratio, Reynolds number, Nusselt number, and the drag coefficient. Selected fin geometries are examined for the heat transfer, fluid friction, and the minimum entropy generation rate corresponding to different parameters includi...