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Opposite ReD-dependencies of nanofluid (Al2O3) thermal conductivities between heating and cooling modes
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10.1063/1.4747329
/content/aip/journal/apl/101/8/10.1063/1.4747329
http://aip.metastore.ingenta.com/content/aip/journal/apl/101/8/10.1063/1.4747329
View: Figures

Figures

Image of FIG. 1.
FIG. 1.

Size distribution of dispersed Alumina (Al2O3) nanoparticles in water and the TEM image of the Al2O3 nanoparticles.

Image of FIG. 2.
FIG. 2.

Experimental configurations to measure dynamic conductivities for nanofluids: (a) the uniform-flux heating mode using an electrical resistance wire heater and (b) the uniform-flux cooling mode using a counter-flow heat exchanger.

Image of FIG. 3.
FIG. 3.

-dependence of dynamic thermal conductivity of alumina nanofluids (particle volume fractions of 2% and 4%) flowing in uniformly heating and cooling tubes. The solid lines represent the corresponding static conductivity values, which are independent of Re D . The dashed lines show the curve fittings of the dynamic thermal conductivity data.

Image of FIG. 4.
FIG. 4.

Thermophoretic velocities of dispersed particles in convective flowing base fluids under uniform wall-heating and wall-cooling conditions. The dashed lines are the curve fittings of the thermophoretic velocities that are independent of nanoparticle loadings (see Eq. (4)).

Image of FIG. 5.
FIG. 5.

Concentration distribution of dispersed particles in radial distances of heating and cooling tube.

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/content/aip/journal/apl/101/8/10.1063/1.4747329
2012-08-22
2014-04-24
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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Opposite ReD-dependencies of nanofluid (Al2O3) thermal conductivities between heating and cooling modes
http://aip.metastore.ingenta.com/content/aip/journal/apl/101/8/10.1063/1.4747329
10.1063/1.4747329
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