Horizontal-tube falling-film heat transfer characteristics of aqueous aluminum oxide nanofluids at concentrations of , , , (with and without sodium dodecylbenzene sulfonate), and 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.
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Research Papers
Investigation on Intertube Falling-Film Heat Transfer and Mode Transitions of Aqueous-Alumina Nanofluids
Binglu Ruan,
Binglu Ruan
School of Energy and Power Engineering,
Xi’an Jiaotong University
, Xi’an 710049, PR of China; Mechanical Science and Engineering, University of Illinois
, Urbana, IL 61801bingluruan@gmail.com
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Anthony M. Jacobi
Anthony M. Jacobi
Mechanical Science and Engineering,
e-mail: a-jacobi@illinois.edu
University of Illinois
, Urbana, IL 61801
Search for other works by this author on:
Binglu Ruan
School of Energy and Power Engineering,
Xi’an Jiaotong University
, Xi’an 710049, PR of China; Mechanical Science and Engineering, University of Illinois
, Urbana, IL 61801bingluruan@gmail.com
Anthony M. Jacobi
Mechanical Science and Engineering,
University of Illinois
, Urbana, IL 61801e-mail: a-jacobi@illinois.edu
J. Heat Transfer. May 2011, 133(5): 051501 (11 pages)
Published Online: January 31, 2011
Article history
Received:
October 2, 2009
Revised:
June 22, 2010
Online:
January 31, 2011
Published:
January 31, 2011
Citation
Ruan, B., and Jacobi, A. M. (January 31, 2011). "Investigation on Intertube Falling-Film Heat Transfer and Mode Transitions of Aqueous-Alumina Nanofluids." ASME. J. Heat Transfer. May 2011; 133(5): 051501. https://doi.org/10.1115/1.4002980
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