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Role of Particle Size to Channel Thickness Ratio on Performance of Nanofluids in Micro-Channels

[+] Author Affiliations
Sonya T. Smith, Mohsen Mosleh, Khosro A. Shirvani

Howard University, Washington, DC

Paper No. IMECE2016-66860, pp. V010T13A042; 5 pages
doi:10.1115/IMECE2016-66860
From:
  • ASME 2016 International Mechanical Engineering Congress and Exposition
  • Volume 10: Micro- and Nano-Systems Engineering and Packaging
  • Phoenix, Arizona, USA, November 11–17, 2016
  • Conference Sponsors: ASME
  • ISBN: 978-0-7918-5064-0
  • Copyright © 2016 by ASME

abstract

Experimental and numerical investigations were conducted to explore the viability of single-phase nanofluids for microchannel cooling. The experiments were conducted with water/ethylene glycol-based nanofluids to investigate the thermal conductivity enhancement. In the numerical analysis, micro-channels ranged in width from 40 μm to 90 μm with the fixed channel height were considered.

Thermal conductivity enhancements of nearly 14% at particle concentration of 0.1% by weight was observed in the experiments. Numerical predictions suggest that design variables (particle size and channel aspect ratio) and thermo-physical properties of the nanofluid have a significant effect on the thermal performance of micro-channel heat sinks. It was shown that at fixed Reynold number, reduction of channel width reduces the hydraulic pressure loss and the heat transfer coefficient, and utilizing nanofluids increases these parameters.

Copyright © 2016 by ASME

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