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On the effectiveness of a nanofluid cooled microchannel heat sink under non-uniform heating condition.

Author(s) : ANBUMEENAKSHI C., THANSEKHAR M. R.

Type of article: Article

Summary

This present experimental study investigates the combined effect of nanofluid and non-uniform heating on the cooling performance of a microchannel heat sink. The microchannel heat sink considered in this study has evenly spaced 30 rectangular channels with a hydraulic diameter of 0.727 mm. Three separate heaters of identical dimensions are used in the experimental study. Non-uniform heating condition is provided by switching on any two of the three heaters at a time. Al2O3/water nanofluid of volume concentration 0.1% and 0.25% and deionized water are used as working fluid. Results show that Al2O3/water nanofluid of 0.25% volume concentration exhibit lower maximum surface temperature and average surface temperature than with Al2O3/water nanofluid of 0.1% volume concentration and water in uniform and non-uniform heating condition. For a given heat transfer fluid and a given heat input, the position of heater (heat source) has a significant effect on the maximum temperature (hotspot) of the heat sink. The maximum surface temperature of the microchannel heat sink is the lowest when the heaters are placed at the upstream of the flow. The values of thermal effectiveness obtained for nanofluids encourage the use of nanofluids in microchannel heat sinks for thermal management of temperature sensitive cooling applications.

Details

  • Original title: On the effectiveness of a nanofluid cooled microchannel heat sink under non-uniform heating condition.
  • Record ID : 30021072
  • Languages: English
  • Source: Applied Thermal Engineering - vol. 113
  • Publication date: 2017/02/25
  • DOI: http://dx.doi.org/10.1016/j.applthermaleng.2016.11.144

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