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Water-based suspensions of Al2O3 nanoparticles and MEPCM particles on convection effectiveness in a circular tube.

Author(s) : HO C. J., HUANG J. B., TSAI P. S., et al.

Type of article: Article

Summary

This work compares experimentally the effectiveness of substituting the water-based suspensions of Al2O3 nanoparticles (nanofluid) and of micro-encapsulated phase change material particles (PCM suspension) for the pure water for laminar forced convective cooling through an iso-flux heated circular horizontal tube. Convection heat transfer experiments have been undertaken for the tube using the pure water, the PCM suspensions (?PCM = 2, 5, and 10 wt.%) and the nanofluids (?np = 2, 6, and 10 wt.%) as the working fluids under the following operating conditions: the volume flow rate Q = 25–240 cm3/min (the Reynolds number Ref = 195–1801), the heating power applied at the outer wall of the tube qo = 20, 30, 40 W, and the inlet fluid temperature Tin = 32.8–33.2°C. In addition, a scale analysis together with integral energy balance is presented concerning thermally developing heat transfer characteristics of the water-based suspension flow in the tube. The convective cooling performance of the water-based suspensions was gauged in terms of local and surface-averaged temperature control effectiveness along the tube wall compared with that obtained for the pure water. Furthermore, the water-based suspensions were compared based on the figures of merit for their heat transfer performances against the corresponding pressure drop penalty. [Reprinted with permission from Elsevier. Copyright, 2010].

Details

  • Original title: Water-based suspensions of Al2O3 nanoparticles and MEPCM particles on convection effectiveness in a circular tube.
  • Record ID : 30002653
  • Languages: English
  • Source: International Journal of thermal Sciences - vol. 50 - n. 5
  • Publication date: 2011/05
  • DOI: http://dx.doi.org/10.1016/j.ijthermalsci.2010.11.015

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