With deionized water as working fluid

experiments on fluid flow and heat transfer enhancement characteristics were conducted in the parallel-microchannel silicon heat sink with expansion-constriction cross sections.Based on the microscale heat transfer enhancement mechanism

two parallel-microchannel silicon heat sink with expansion-constriction cross sections were designed and processed.In contrast to the corresponding conventional rectangular microchannel heat sink

the flow and heat transfer parameters of parallel-microchannel silicon heat sink with expansion-constriction cross sections were obtained in different volume flow rates and constant wall heat flux

along with simultaneous measurement of volume flow rate

pressure drop and temperature in the inlet and outlet

and wall temperature at the substrate of heat sink.It is found that the heat transfer rate of parallel-microchannel silicon heat sink with expansion-constriction cross sections is increased by 12.5%-85.1% over the rectangular straight microchannel heat sink value

but the friction factor is only increased by -9.2%-31.4%

showing that the parallel-microchannel silicon heat sink with expansion-constriction cross sections has superior heat transfer enhancement characteristics.