Journal
REVIEW OF SCIENTIFIC INSTRUMENTS
Volume 81, Issue 3, Pages -Publisher
AMER INST PHYSICS
DOI: 10.1063/1.3359856
Keywords
aluminium; coatings; convection; cooling; copper; thermal management (packaging)
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An instrument is developed to evaluate the performance of heat dissipative coatings. The instrument has features to measure the apparent emissivity of a given surface under different input power settings. The emissivity of aluminum (Al Q-panel) and copper, as measured from 60-135 degrees C, showed a value of 0.15 +/- 0.03 and 0.42 +/- 0.05, respectively, consistent with reported values in literature. The relative emissivity of a heat dissipative coating, called as molecular fan carbon nanotube MF-CNT, was found to be similar to 0.97. A simple mathematical model is built to evaluate the role of different heat transfer mechanisms (convection and radiation) on cooling performance, and it was observed that convection plays a dominant role in cooling, with more than 90% of heat transferred by convection. In presence of MF-CNT coating, radiation heat transfer increases to similar to 30% and lowers the steady state temperature by 10 degrees C. It is illustrated that radiative cooling could be a significant factor in thermal management.
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