A transient thermal analysis is performed to investigate thermal control of power semiconductors using phase change materials, and to compare the performance of this approach to that of copper heat sinks. Both the melting of the phase change material under a transient power spike input, as well as the resolidification process, are considered. Phase change materials of different kinds (paraffin ...

The structure and properties of , heat and moisture sources and sinks of the Asian monsoon are reviewed. Results from the First GARP Global Experiment (FGGE) have yielded important information on these sources, ranging from the planetary scale down to the scale of individual convective systems. The emerging picture is one of a complex spatial and temporal distribution of heat sources over the e...

A nonequilibrium molecular dynamics (NEMD) method using stochastic energy injection and removal as uniform heat sources and sinks is developed to calculate the thermal conductivity. The stochastic energy is generated by a Maxwell function generator and is imposed on only a few individual molecules each time step. The relaxation of the thermal perturbation is improved compared to other NEMD algo...

Flow boiling heat transfer enhancement using porous coatings in microchannels has been experimentally investigated with HFE-7200. Results of the coated microchannel sink were compared to baseline results a plain, micro-milled copper at similar operating conditions, namely inlet pressure 1 bar, mass flux 200 – 400 kg/m2 s and subcooling 10 K wall fluxes between 24.5 kW/m2 206.6 kW/m2. visualisat...