Study of Size, Shape and Nanoparticle Concentration Effect in Micro-Channel, Pillar and Flat Channel

  • Authors

    • Ass. Prof. Debashis Dey
    • . .
    2018-12-13
    https://doi.org/10.14419/ijet.v7i4.39.25666
  • Nanofluid, Micro-channel, Convective Heat Transfer, Radiative Heat Transfer.
  • In this study,thermal efficiency was calculatedbased on experimental results of micro channels, flat channel and pillars. Here constant heat flux was applied from the bottom of the test section using film heaters where DC (Direct Current) power was supplied to the heaters and a lamp was used for radiation experiments. The flow through channels and pillars were maintained at constant rate using two syringe pumps. There were eight thermocouples for heater and six thermocouple for radiation to measure the temperature continuously using DAQ (Data Acquisition) system at different locations of the test section. Pressure drop between inlet and exit was recorded using calibrated pressure sensor and the reading was fed to the DAQ system. There were different fluids like DI (De-Ionized) water, 0.05%TiO2 (Titanium di-Oxide), 0.1%TiO2 and again water was used for testing. Similar series of tests were carried out with SiO2 (Silica) as well. It has been found that nano-fluid has significant effect (it is termed as the “nanofin effectâ€) on effective convective heat transfer as it creates “Nanofin†on the substrate surface and effectively increase the area for heat transfer. However, after a certain concentration of nano-fluids, the effective area for fluid passage also decreases and thus convective heat transfer decreases. This is why water repeat case gives best result among all four cases on heat transfer.

     

  • References

    1. [1] R.Mahajan, C. Chiu, G Chrysler, Cooling a micro-processor chip, Proceedings of the IEEE, Volume 94, Issue 8,August 2006, PP 1476 – 1496.

      [2] J. Baker, New technology and possible advances in energy storage, Energy Policy, Volume 36, Issue12, December 2008, PP 4368 – 4373.

      [3] I. Hadjipaschalis, A. Poullikkas, V. Efthimiou, Overview of current and future energy storage technologies for electric power applications, Renewable and Sustainable Energy Reviews, Volume 13, Issues 6-7, August-September 2009, PP 1513 – 1522.

      [4] J. A. Eastman, S. U. S. Choi, S. Li, W. Yu, L. J. Thompson,Anomalously increased effective thermal conductivities of ethylene glycol-based nanofluids containing copper nanoparticles, Applied Physics Letters, Volume 78, Issue 6, February 2001, https://doi.org/10.1063/1.1341218.

      [5] D. Shin, D. Banerjee, Enhancement of specific heat capacity of high temperature silica nanofluids synthesized in alkali chloride salt eutectics for solar thermal energy storage applications, International Journal of Heat and Mass Transfer, Volume 54, Issues 5-6, February 2011, PP 1064 – 1070.

      [6] S. U. S.Choi, J. A. Eastman, Enhancing thermal conductivity of fluids with nanoparticles, ASME IMECE,November 12 – 17, 1995.

      [7] ]N. Singh and D. Banerjee, Nanofins: Science and Applications, New York: Springer, 2014.

      [8] S. Vafaei and D. Wen, Flow boiling heat transfer of alumina nanofluids in single microchannels and the roles of nanoparticles, Journal of Nanoparticles Research, Volume 13,Issue 3, PP 1063-1073, March 2011.

      [9] L. Xu and J. Xu, Nanofluid stabilizes and enhances convective boiling heat transfer in a single microchannel, International Journal of Heat and Mass Transfer, Volume 55, Issues 21-22, PP 5673-5686, October 2012.

      [10] S.J. Kline, F.A. McClintock, Describing uncertainities in single sample experiments, Mechanical Engineering 1, ASME, 1953.

  • Downloads

  • How to Cite

    Debashis Dey, A. P., & ., . (2018). Study of Size, Shape and Nanoparticle Concentration Effect in Micro-Channel, Pillar and Flat Channel. International Journal of Engineering & Technology, 7(4.39), 608-614. https://doi.org/10.14419/ijet.v7i4.39.25666