Experimental Investigation of Microchannel Heat Sink with Modified Hexagonal Fins


1 Microwave Tube Research and Development Centre, BEL, Jalahalli, Bangalore, 560 013 India

2 PES Institute of Technology, 100 feet Ring Road, BSK III Stage, Bangalore, 560 085 India

3 University Visvesvaraya College of Engineering, KR Circle, Bangalore, 560 001 India


The concept of periodic renewal of boundary layers is a promising technique for the enhancement of heat transfer in microchannels. Extending the above concept, microchannel heatsink with modified hexagonal fins has been proposed for disrupting the flow periodically. An experimental study has been carried out to investigate the heat transfer and fluid flow characteristics of a microchannel heat sink with modified hexagonal fins and a conventional type of microchannels with plate fins. The heat transfer and fluid flow characteristics of the modified hexagonal fin microchannels have been compared with the plate fin microchannels. The heat transfer enhancement factor and pressure drop penalty factors are evaluated and compared. The modified hexagonal fin microchannel heat sink has been found to outperform the plate fin microchannel heat sinks in spite of the lesser heat transfer area.