On the reliable estimation of heat transfer coefficients for nanofluids in a microchannel

Ridho Irwansyah, Christian Cierpka, Christian J. Kahler

Research output: Contribution to journalConference articlepeer-review

4 Citations (Scopus)


Nanofluids (base fluid and nanoparticles) can enhance the heat transfer coefficient h in comparison to the base fluid. This open the door for the design of efficient cooling system for microelectronics component for instance. Since theoretical Nusselt number correlations for microchannels are not available, the direct method using an energy balance has to be applied to determine h. However, for low nanoparticle concentrations the absolute numbers are small and hard to measure. Therefore, the study examines the laminar convective heat transfer of Al2O3-water nanofluids in a square microchannel with a cross section of 0.5 x 0.5 mm2 and a length of 30 mm under constant wall temperature. The Al2O3 nanoparticles have a diameter size distribution of 30-60 nm. A sensitivity analysis with error propagation was done to reduce the error for a reliable heat transfer coefficient estimation. An enhancement of heat transfer coefficient with increasing nanoparticles volume concentration was confirmed. A maximum enhancement of 6.9% and 21% were realized for 0.6% Al2O3-water and 1% Al2O3-water nanofluids.

Original languageEnglish
Article number032078
JournalJournal of Physics: Conference Series
Issue number3
Publication statusPublished - 21 Oct 2016
Event7th European Thermal-Sciences Conference, Eurotherm 2016 - Krakow, Poland
Duration: 19 Jun 201623 Jun 2016


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