Thermal diffusivity is a measure of the transient thermal response of a material to a change in temperature and the term thermal diffusivity (α) is defined asα= k/(ρ x cp) where αis the thermal diffusivity (m2/sec) k is the thermal conductivity (W/m-K) ρ is the density (kg/m3) cp is the heat capacity (J/kg-K) It should be noted that each of these quantities can … [Read more...]
Thanks and Congratulations
Since the first issue of ElectronicsCooling magazine emerged in June 1995, I have had the privilege of publishing a number of feature articles in the magazine. Writing these articles came relatively easy because the topics addressed were on aspects of electronics cooling, such as liquid cooling, thermoelectrics and air cooling, that I have worked on throughout my 41 years in … [Read more...]
Developments with metallic thermal interface materials
Electronics industry needs for improved performance of thermal interface materials (TIMs) are driving continued reductions in thermal resistance. These reductions are being achieved with materials that become liquidous or near-liquidous at predictable operating temperatures, with extremely high thermal conductivity filler materials, or with both. Metallic alloys with low … [Read more...]
Compact thermal modeling in electronics design
Compact thermal modeling in electronics design Sarang Shidore Flomerics Inc Introduction The challenge of accurately predicting junction temperatures of IC components in system-level CFD simulations has engaged the engineering community for a number of years. The primary challenge has been that near-exact physical models of such components (known as detailed thermal models, or … [Read more...]
About viscosity
Table 1. Dynamic Viscosity Values for Various Gases and Liquids When we look at a fluid parcel subject to a velocity gradient in the direction perpendicular to the direction of the flow, we observe that this fluid parcel deforms. This type of deformation is called shear. The ability to withstand shear is a material property called the dynamic viscosity m. The viscosity … [Read more...]
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