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Flow boiling microgap heat sink is attractive due to its high heat transfer capability in compact spaces with a smaller rate of coolant flow than its single phase counterpart. Other advantages of this method are the ease of fabrication and implementation (direct cooling). Although there is general agreement that this system may be able to maintain greater temperature uniformity across the heat sink...
Experiments on flow boiling were conducted in straight and stepped fin microchannels. The test vehicles were made from copper with a footprint area of 25mm × 25mm. The microchannels were formed by wire cut Electro Discharge Machining process and have surface roughness (Ra) of about 2.0 µm. Tests were performed on channels having nominal width of 300 µm and a nominal aspect ratio of 4 over different...
Experiments on flow boiling were conducted in parallel and oblique finned microchannels. The test vehicles were made from copper with a footprint area of 2.5cm × 2.5cm. The microchannels were formed by wire cut Electro Discharge Machining process and have surface roughness (Ra) of about 2.0 μm. Tests were performed on channels having width of 500 μm and a nominal aspect ratio of 3 over different mass...
Sectional oblique fins are employed in contrast to the continuous fins in order to modulate the flow in microchannel heat sink. The breakage of continuous fin into oblique sections causes the thermal boundary layers to be re-initialized at the leading edge of each oblique fin and reduces the boundary-layer thickness. This regeneration of the entrance effect causes the flow to be always in a developing...
To develop a high effectiveness, reliable, cost-effective compact heat exchanger is one of the key issues for effective use of thermal energy. By stacking multilayered flat thin rectangular plates with a number of regular honeycomb cells etched inside, the well designed staggered fluid flow channels are formed to enhance heat transfer. For the cooling system with the new type design heat sink, experimental...
Cryoablation is a minimally invasive ablation technique for primary and metastatic hepatic tumors. Inadequate freezing around large blood vessels due to the warm blood flow can lead to local recurrence, and thus, necessitates close application of a cryoprobe to the large blood vessels. In this study, we constructed a perfusion model with an exvivo bovine liver and ablated the tissue around a large...
ldquoDevelopment for advanced thermoelectric conversion systemsrdquo supported by the new energy and industrial technology development organization (NEDO) has been successfully completed as one of the Japanese national energy conservation projects. Three types of the cascaded thermoelectric modules operating up to 850 K in high electrode temperature and two types of Bi-Te thermoelectric modules operating...
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