Laminar forced convection effectiveness of Al2O3-water nanofluid flow in a circular tube at various operation temperatures: Effects of temperature-dependent properties

C. J. Ho, C. Y. Chang, C. Y. Cheng, S. J. Cheng, Y. W. Guo, S. T. Hsu, Wei Mon Yan

研究成果: Article同行評審

15 引文 斯高帕斯(Scopus)

摘要

In this paper, effects of temperature-dependent thermophysical properties on laminar forced convection effectiveness of Al2O3-water nanofluids in a circular tube imposed to a constant heat flux are investigated numerically. The numerical study is supplemented with a scale analysis based on the integral energy equation. The analysis is conducted for various inlet temperatures and considering two cases for properties including (i) constant-properties, and (ii) temperature-dependent properties. The simulated results are presented for three different concentrations of nanofluids i.e. 0%, 5%, and 9%, volume flow rates in the range of 24-180 cm3/min which correspond with Reynolds numbers between 120 and 2000, heat fluxes between 5.51 × 102 and 1.23 × 104 W/m2, and various inlet temperatures in the range of 25-50 °C. The effects of various inlet temperatures of nanofluids and different thermophysical models on the local and average Nusselt numbers in the tube have been investigated in details. It is found that with an increase in both nanofluid concentration and temperature rise in the heated section, the effects of inlet temperature and thermophysical properties on the Nusselt number are more pronounced.

原文English
頁(從 - 到)464-481
頁數18
期刊International Journal of Heat and Mass Transfer
100
DOIs
出版狀態Published - 2016 九月 1

All Science Journal Classification (ASJC) codes

  • 凝聚態物理學
  • 機械工業
  • 流體流動和轉移過程

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