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Convective Heat Transfer with Nanofluids
KTH, School of Industrial Engineering and Management (ITM), Energy Technology, Applied Thermodynamics and Refrigeration.
2011 (English)Independent thesis Advanced level (degree of Master (Two Years)), 30 credits / 45 HE creditsStudent thesis
Abstract [en]

The present Master thesis is concerned with forced convection heat transfer in laminar and turbulent flowwith nanofluids. Nanofluids are defined as a colloidal suspension of particles in a base fluid, where theparticles have a characteristic length of less than 100 nm. Experiments were conducted to determine thequalification of nanofluids for laminar and turbulent flow forced convection heat transfer. Theexperiments were conducted in two different devices: Firstly, a stainless steel pipe with an inner diameterof 3.7 mm, heated directly by a DC current in the pipe wall, and secondly, a tubular heat exchanger, whichthe fluid was cooled down in. The tested nanofluids were not only assessed considering Nu/Re, as it hasbeen found to be common in a short literature review, but also by taking into account the pressure drop indifferent ways. A way of considering pressure drop in non-dimensional quantities was introduced that hadnot been seen in literature. In some cases, an opposite assessment for the fluid could be found fromcomparing Nu/Re of base fluid and nanofluid and comparing h/Δp. Difficulties during validation of thetest rig had called for system improvement; an extensive error investigation was conducted on the test rigand the calculation. The error investigation resulted in changes concerning the calculation and the test rig.

Place, publisher, year, edition, pages
2011. , 112 p.
National Category
Energy Engineering
URN: urn:nbn:se:kth:diva-48216OAI: diva2:457011
Subject / course
Applied Thermodynamics
Educational program
Master of Science in Engineering - Mechanical Engineering
2011-10-06, ETT Kitchen, Brinellvägen 68, Stockholm, 10:30 (English)
Available from: 2011-11-16 Created: 2011-11-16 Last updated: 2011-11-16Bibliographically approved

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