Introduction The thermal resistance of a heat sink is a convenient way of describing its performance but, unlike its electrical counterpart, the thermal resistance of a heat sink is not a constant: it changes significantly with air flow. How we "understand" heat sinks is revealed by the models we use to describe their thermal resistance. Most thermal engineers use a single-term … [Read more...]
Thermal Modeling Approaches Of GaAs Semiconductors
Introduction Predicting gallium arsenide (GaAs) semiconductor temperature is imperative since it affects the performance and reliability of the chip and the design as a whole. In many circumstances, the thermal engineer will be asked to provide expeditious and accurate answers to trade studies regarding various FET layouts and geometry, metallization schemes, and conduction … [Read more...]
A Practical Implementation Of Silicon Microchannel Coolers
Introduction More than twenty-five years ago, Tuckerman and Pease first described the use of silicon microchannel cooling for very high power densities [1]. However, the coolers could not be fabricated easily and pressure drops were very high. As chip power densities are now increasing beyond air cooling limits, a variety of liquid cooling methods are being investigated. Due to … [Read more...]
Advanced Cooling Using Meso-Scale Evaporative Cold Plates
Introduction Thermal management of servers and communications equipment has become significantly more challenging over the past several years. As is well known, processor powers have increased to 150 W or more and are projected to continue to rise, despite the move to multi-core designs (and the huge investment in software that this entails) [1]. Rack-level functional density … [Read more...]
Electronics Cooling At Higher Pressures … a Positive Displacement Pump Solution
Introduction Many liquid cooling solutions in use today employ cooling system devices that result in system pressure drops limited to <0.5 bar (7.25 psi), which allows these systems to fit within the limits of centrifugal pumps. The evolution of alternative cooling devices has brought about pressure drop requirements >1.0 bar (14.50 psi) in some cases [1]. These higher … [Read more...]
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