Experimental investigation of pin fin heat sink effectiveness

摘要

An experimental investigation of heat sink effectiveness is described. The heat sinks were constructed of aluminum and consisted of an array of staggered pin fins. Each of the three heat sinks had constant fm height, constant fin diameter, but the pitch was varied. The three interstitial pitches (distance from pin center to pin center measured diagonally) used were: P/d = 3/1, 9/4, 3/2. Heat generation was accomplished using cartridge heaters inserted into a copper block. The high thermal conductivity of the copper ensured that the surface beneath the heat sink would be at a constant temperature. The cooling fluid was air and the experiments were conducted with a Reynolds numbers based on a porous media type hydraulic diameter ranging from 1000 to 20000. The channel had a shroud that touches the fin tips, eliminating any flow bypass. The experimental results were compared to a numerical algorithm based on VAT (volume averaged theory) calculations. A number of data reduction parameters and procedures were developed using scaling for heterogeneous media suggested by volume averaging theory. A correlation relating heat transfer performance to Reynolds number and other important characteristic parameters is given and the results are compared to the literature.