In the August 2003 issue, the Technical Data column was devoted to emissivity in practical temperature measurements. But what about the emissivity value that should be entered in your numerical model? Can we use the measured values as discussed in the column mentioned? Let me summarize the main points of it: Emissivity is not only a material property but also a surface … [Read more...]
Advanced Metal Diamond Composites – Love and Heat Relationship
Introduction Thermal management is a critical issue in high-power laser diode and LED packages, and microprocessor units [1, 2]. Reliability and long life time of electronic packages call not only for materials with high thermal conductivity but also a coefficient of thermal expansion (CTE) matching to that of semiconductors. The thermal expansion of the heat sink material in … [Read more...]
A Cryocooler In Your Laptop Computer? Maybe…
Introduction A review of the technical and market impediments overcome in the development and eventual acceptance of cryocoolers for space-borne applications may shine light on the prospects for the use of such mechanical refrigeration systems in more widespread commercial uses. This premise is explored by first reviewing space cooler development history, then considering some … [Read more...]
Thermal Optimization And Design For Manufacturability Of Liquid-Air Hybrid Cooling Systems
Introduction Existing technologies typically utilize air to carry the heat away from a heat sink that is thermally coupled to the microprocessor. Higher performance devices such as workstations, "gaming" PCs, or tower servers that utilize components with greater power dissipation can require more aggressive cooling technology. A high-performance alternative to heat sinks is a … [Read more...]
Simplified Correlations For Radiation Heat Transfer Rate In Plate-Fin Heat Sinks
Radiation heat transfer can be a significant portion of total heat transfer from a heat sink, particularly in natural convection flows. The enclosures for most natural-convection-cooled indoor and outdoor electronic equipments, such as pole or wall-mount base stations and radio units, include external fins to improve natural convection and radiation heat transfer rates. Early … [Read more...]
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