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International Heat Transfer Conference 13

ISBN Druckformat: 1-56700-226-9 (CD)
ISBN Online: 1-56700-225-0

HEAT TRANSFER MECHANISMS IN NANOFLUIDS
-- EXPERIMENTS AND THEORY --

DOI: 10.1615/IHTC13.p30.110
page 33

Stephan Kabelac
Leibniz University, Institute for Thermodynamics, Callinstrasse 36, 30167 Hanover,Germany

J. F. Kuhnke
Helmut-Schmidt University of the Federal Armed Forces, Hamburg, Germany

Abstrakt

Nanofluids are colloidal suspensions with nanoparticles at low volume fractions. These colloidal fluidic systems show unusually high thermal conductivity provided they are prepared in a suitable stable manner. Even though the gain in thermal conductivity is accompanied by a similar rise in viscosity, these fluids may be valuable candidates for a variety of heat transfer applications.
Experimental values on the thermal conductivity of nanofluids published in the literature show an astonishing spectrum of results. These results, separated into organic and into aqueous fluids, will be discussed thoroughly searching for systematic trends. Own measurements based on different measurement methods show a very sensitive behavior of nanofluids to the plentiful influencial parameters, specially their electro-thermal behavior. A variety of theoretical models which try to explain the various experimental results will be addressed. A model by Wang et al. (2005) based on the important electrochemical interface physics in colloidal systems is discussed. Results on viscosity measurements and on measurements of the convection heat transfer important for the technical application background will be reviewed. Similar diverging results as for the thermal conductivity are seen here as well.

IHTC-13 Digital Library

Measurement of fluid temperature with an arrangement of three thermocouples FLOW BOILING OF A HIGHLY VISCOUS POLYMER SOLUTION