In this work\ a comparative investigation of jet impingement and microchannel cooling is presented[ The thermal performance of each technology evaluated at the respective optimal condition is compared to each other with the target dimension as a main parameter[ It is revealed that the microchannel cooling is preferable for a target dimension smaller than 9[96 by 9[96 m\ while the jet impingemen...

The heat transfer of a water spray impinging upon a surface in a very low pressure environment is of interest to cooling of space vehicles during launch and re-entry, and to industrial processes where flash evaporation occurs. At very low pressure, the process occurs near the triple point of water, and there exists a transient multiphase transport problem of ice, water and water vapor. At the i...

Active control of die-level temperature is required during production testing of high power microprocessors in order to ensure accurate performance classification, but control is becoming more difficult as the device power densities increase. With power densities approaching 100 W /cm2, the current passive control systems are no longer able to maintain the required temperature tolerance for pro...

A phenomenological modelling approach has been developed to describe the massive transformation and the formation of lamellar microstructures during cooling in binary g titanium aluminides. The modelling approach is based on a combination of nucleation and growth laws which take into account the specific mechanisms of each phase transformation. Nucleation of massive and lamellar g is described ...