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Experiments on low velocity cooling of high conductivity substrates

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3 Author(s)
Sikka, K.K. ; IBM Corp., Hopewell Junction, NY, USA ; Torrance, K.E. ; Fisher, Timothy S.

Experiments are reported on low velocity cooling of a heater-on-substrate geometry for high conductivity substrate materials. Four different substrate materials were studied: 1) aluminum 6061-T6; 2) aluminum nitride; 3) alumina; 4) FR-4. The effects of combined buoyancy and forced air flow, geometric orientation, substrate size, thermal conductivity, and emittance on heat transfer are evaluated. Results define the performance of the substrates and the limits of conjugate mixed convection for horizontal substrates, and of orientation effects for substrates tilted from buoyancy-opposing to buoyancy-assisting orientations. An analytical approximation is described that predicts the experimental data with good accuracy over broad parameter ranges

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Components and Packaging Technologies, IEEE Transactions on  (Volume:22 ,  Issue: 2 )