Natural convection immersion cooling of an array of heated protrusions in an enclosure filled with dielectric liquid: effects of enclosure width and fluid Prandtl number
Kelleher, Matthew D.
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An experimental investigation of natural convection immersion cooling of an array (3 by 3 horizontally-placed heated discrete protrusions) in an enclosure filled with dielectric fluids has been conducted. Each rectangular protrusion simulates a 20 pin dual-inline-package. Effects of enclosure width and fluid Prandl number were examined. Five different spacings from 42 mm to 7 mm and two dielectric fluids, FC-75 (PR=25 at 27(o) C) and FC-43 (Pr=82 at 27(o)C).were used. The top boundary of the enclosure was kept constant at 10(o)C and the bottom boundary was insulated during the experiments. Power dissipation levels per component ranged from 0.115 W to 2.9 w. Component surface temperature measurements were used to obtain the nondimensional heat transfer parameters. In the case of FC-75 and 30 and 7 mm spacings, and in the case of FC-43 and 7 mm spacing, timewise fluctuations of temperature at steady state in several locations were recorded with increasing power level.
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