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Nanofluid flow in pipes with twisted tape does not show anomalous enhancement of heat transfer

DOI: 10.1615/ICHMT.2012.ProcSevIntSympTurbHeatTransfPal.190
pages 177-180

M. Gruschka
Technische Universitat Dresden, Institute of Fluidmechanics, Mommsenstr. 13, 01069 Dresden, Germany

Matthias H. Buschmann
Institut für Luft- und Kältetechnik gGmbH, Bertolt-Brecht-Allee 20, 01309 Dresden, Germany

Resumo

Experiments with DI-water and two nanofluids having different TiO2-concentrations have been carried out in pipe flow with inserted twisted tape. No anomalous enhancement of heat transfer was found. It is shown that heat transfer in this specific nanofluid flow is caused by the change of properties alone. With respect to scaling experimental results of nanofluid flow it is argued that evaluation based on Reynolds number alone is misleading. In any case the appropriate Prandtl number representing the actual thermophysical properties has to be considered.

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