Abstract
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Highlights
It is estimated that future satellite missions will require a heat-rejection capability measured in the 100’s of W/cm2, consistent with the general electronics trends of miniaturization and increasing power densities
A type of passive thermal system, the oscillating heat pipe (OHP), has the potential to successfully perform with high waste heat removal and minimal manufacturing cost
This paper investigates the pressure oscillations created inside the internal OHP channels due to the two-phase motion of the working fluid
Summary
It is estimated that future satellite missions will require a heat-rejection capability measured in the 100’s of W/cm, consistent with the general electronics trends of miniaturization and increasing power densities. Current generations of thermal spreaders available to deal with these large heat fluxes add significant weight, have a poor form factor, consume power, and can drastically increase the cost of manufacturing the final product. Miyazaki and Akachi (1996) varied the heat flux and charging ratio to study the pressure oscillation characteristics of an OHP. An analytical model was developed and it was determined that better heat transfer performance was achieved when frequency and amplitude of pressure oscillations was increased and decreased, respectively. Kim et al varied the heat flux and charging ratio in an effort to better understand the pressure oscillation characteristics (Kim et al, 2003). At 20 and 80% fill rates the pressure wave forms were too complicated and a fundamental frequency could not be found and heat transfer performance was reduced. A relation was developed between the effective thermal conductivity and the frequency of the temperature oscillations
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