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.
| Identifer | oai:union.ndltd.org:UPSALLA1/oai:DiVA.org:kth-48216 |
| Date | January 2011 |
| Creators | Ströder, Simon |
| Publisher | KTH, Tillämpad termodynamik och kylteknik |
| Source Sets | DiVA Archive at Upsalla University |
| Language | English |
| Detected Language | English |
| Type | Student thesis, info:eu-repo/semantics/bachelorThesis, text |
| Format | application/pdf |
| Rights | info:eu-repo/semantics/openAccess |
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