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Benchmark Coolit Predictions for Plate Fin Array.

Courtesy of Nokia.

This experiment, carried out at Nokia Research Center in Helsinki, was designed to provide well-defined model for CFD simulations, thereby eliminating eliminate potential uncertainties. The fin array was isothermally powered to within 1C by electrical cartridge heaters.

Temperature was monitored by a combination of PT 100 platinum resistance sensors (DIN IEC 751) embedded in the cartridge heaters and thermocouples attached to the baseplate. Temperature and power dissipation were measured to within 0.2 C and 1% respectively. To permit heat transfer rate calculations, a double-sided symmetry design was employed. The enclosure walls were water cooled to ensure isothermal surfaces and permit definition of fin array adiabatic wall temperature. Fluid velocity and temperature profiles were measured at the upper and lower opening of a central u-channel passage using hot wire anemometry, and salient features of enclosure fluid flow were observed using smoke flow visualization.

Coolit simulation was run blind, i.e. without the knowledge of experimental data. The flow pattern computed by Coolit and the fin array (1/4th) are shown in the adjacent figure. A plot of heat flux from the heat sink predicted by Coolit shows excellent agreement with experimental data.

 
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