Investigation on intertube falling-film heat transfer and mode transitions of aqueous-alumina nanofluids

Binglu Ruan, Anthony M. Jacobi

Research output: Contribution to journalArticlepeer-review

Abstract

Horizontal-tube falling-film heat transfer characteristics of aqueous aluminum oxide nanofluids at concentrations of 0 vol %, 0.05 vol % (0.20 wt %), 0.5 vol % (1.96 wt %), 1 vol % (3.86 wt %) (with and without sodium dodecylbenzene sulfonate), and 2 vol % (7.51 wt %) are investigated and compared with predictions developed for conventional fluids. The thermophysical properties of the nanofluids, including thermal conductivity, kinematic viscosity, and surface tension, are reported, as is the mode transition behavior of the nanofluids. The experimental results for heat transfer are in good agreement with predictions for falling-film flow and no unusual Nu enhancement was observed in the present studies. Additionally, a 20% mode transitional Reynolds number increase was recorded for transitions between sheets and jets and jet-droplet mode to droplet mode. Although the findings with water-alumina nanofluids are not encouraging with respect to heat transfer, the results extend nanofluid data to a new type of flow and may help improve our understanding of nanofluid behavior. Moreover, this work provides a basis for further work on falling-film nanofluids.

Original languageEnglish (US)
Article number051501
JournalJournal of Heat Transfer
Volume133
Issue number5
DOIs
StatePublished - 2011

Keywords

  • falling-film
  • heat transfer
  • mode transition
  • nanofluids
  • surface tension
  • thermal conductivity
  • viscosity

ASJC Scopus subject areas

  • Materials Science(all)
  • Condensed Matter Physics
  • Mechanics of Materials
  • Mechanical Engineering

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