Estimation of Viscous and Inertial Resistance Coefficients for Various Heat Sink Configurations

In the presented paper a simple method was applied to calculate a viscous and inertial resistant coefficient of a porous material substituting a flared fin heat sink geometry. Based on the performed calculations plots showing the variation of the resistant coefficients with heat sink height and distance between fins were made. In addition, empirical relations that can be applied for a calculation of required resistant coefficients were proposed. Finally a comparison of a flow characteristic both for the real heat sink and its porous representation for selected cases was shown. In the analysis an air flow in room temperature was investigated. Analyses were performed for a range of Reynolds number: 8.3·103 - 1.7 104. All the necessary numerical calculations were made in ANSYS Fluent commercial code, Microsoft Excel and Matlab.