Around 1980, when I joined the Heat Transfer Group at Philips CFT, my boss threw a piece of material on my desk and asked for its thermal conductivity. It took me a week digging in literature to discover that this was no easy question to answer, despite the simple mathematics behind a steady state measurement: k=q/∆T/A, with k the thermal conductivity, q the dissipation, ∆T the … [Read more...]
Calculation Corner: Thermal Interactions Between High-Power Packages and Heat Sinks, Part 2
These days, many thermal engineers face the challenge of defining effective heat sink cooling solutions for high power processors and ASICs (Application-Specific Integrated Circuits). The usual practice would be to calculate a value of ΘJA (junction-to-air thermal resistance) for the combined package/heat sink assembly and compare it to the requirements of the … [Read more...]
Ultrafast Submicron Thermoreflectance Imaging
K. Yazawa and A. Shakouri Baskin School of Engineering, University of California at Santa Cruz, California Both the miniaturization of electronic and optoelectronic devices and circuits and the increased operation speeds of electronic devices have exacerbated localized heating problems. Steady-state and transient characterization of temperature distribution in devices … [Read more...]
Thermal Challenges in Today’s Commercial and Military Aviation
For aviation platforms, the goal is to design the most high performance and lightweight systems that exceed the required reliability standards. Military aircraft often emphasize mission capability as the key objective, while commercial aircraft emphasize Specific Fuel Consumption (SFC) and overall life-cycle costs. Traditionally mechanical, hydraulic, and pneumatic drive … [Read more...]
Reasons to Use Two-Phase Refrigerant Cooling
Water-cooling at the rack appears to be the new short-term technological solution for server cooling in datacenters, with its advantages over traditional cold aisle/hot aisle air-cooling being clear, as can be seen in [1]. Bringing chilled water to the rack and then cooling the air inside the rack aids with the transport of energy across the datacenter, making the necessity for … [Read more...]
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