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

C. J. Ho, J. B. Huang, P. S. Tsai, Y. M. Yang

Research output: Contribution to journalArticlepeer-review

62 Citations (Scopus)


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 (ωPCM = 2, 5, and 10 wt.%) and the nanofluids (ωnp = 2, 6, and 10 wt.%) as the working fluids under the following operating conditions: the volume flow rate Q = 25-240 cm 3/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.

Original languageEnglish
Pages (from-to)736-748
Number of pages13
JournalInternational Journal of Thermal Sciences
Issue number5
Publication statusPublished - 2011 May

All Science Journal Classification (ASJC) codes

  • Condensed Matter Physics
  • General Engineering


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