Heat transfer of falling film flowing around a horizontal tube with nanofluids

Binglu Ruan, Anthony M Jacobi, Liansheng Li

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

Due to its high heat transfer coefficient and low working fluid inventory, the horizontal-tube, falling-film heat exchanger finds wide application as an absorber, condenser and Evaporator. Recent advances in nanotechnology suggest the use of nanofluids in heat exchangers. Some researchers find an enhanced heat transfer with nanofluids, while others report no enhancement or a deleterious effect on heat transfer when Applying nanoparticles in the working fluids. In the current Work, the thermal conductivity and kinematic viscosity of aqueous alumina nanofluids are measured at concentrations of 0 vol%, 0.05 vol%, 0.5 vol%, 1 vol% (with and without sodium iodecylbenzene sulfonate, SDBS), and 2 vol%. For these ianofluids, the impact of nanoparticles on thermal conductivity and viscosity is small (less than 5% for thermal conductivity and 13% for viscosity). The heat transfer characteristics of fcese nanofluids are measured and compared to predictions from the literature for conventional fluids. The falling-film heat transfer for these nanofluids is in good agreement with predictions, and no unusual heat transfer enhancement is pbserved in the present studies. 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)
Title of host publicationProceedings of the ASME Micro/Nanoscale Heat and Mass Transfer International Conference 2009, MNHMT2009
Pages643-652
Number of pages10
DOIs
StatePublished - Jul 12 2010
EventASME 2009 Micro/Nanoscale Heat and Mass Transfer International Conference 2009, MNHMT2009 - Shanghai, China
Duration: Dec 18 2009Dec 21 2009

Publication series

NameProceedings of the ASME Micro/Nanoscale Heat and Mass Transfer International Conference 2009, MNHMT2009
Volume3

Other

OtherASME 2009 Micro/Nanoscale Heat and Mass Transfer International Conference 2009, MNHMT2009
CountryChina
CityShanghai
Period12/18/0912/21/09

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Keywords

  • Falling film
  • Heat transfer
  • Kinematic viscosity
  • Nanofluids
  • Thermal conductivity

ASJC Scopus subject areas

  • Fluid Flow and Transfer Processes

Cite this

Ruan, B., Jacobi, A. M., & Li, L. (2010). Heat transfer of falling film flowing around a horizontal tube with nanofluids. In Proceedings of the ASME Micro/Nanoscale Heat and Mass Transfer International Conference 2009, MNHMT2009 (pp. 643-652). (Proceedings of the ASME Micro/Nanoscale Heat and Mass Transfer International Conference 2009, MNHMT2009; Vol. 3). https://doi.org/10.1115/MNHMT2009-18553