INTRODUCTION TO THE HEAT TRANSFER IN NANOFLUIDS
Independent thesis Advanced level (degree of Master (Two Years)), 20 credits / 30 HE creditsStudent thesis
Many industries, as vital needs, require ultrahigh cooling performance. For electronic systems especially data centres and electronic packaging the bottleneck is mostly thermal than electrical. Thus invention of any higher performance cooling fluid will open new windows to technology to have faster computing speed in data centres and more reliable electrical systems. Nanofluids seem to be an answer to this continuously increasing demand.
Nanofluids are made of two elements: normal liquids, such as water or alcoholic mixtures and some small volume fraction of suspended nanoparticles as the colloidal solutions. Markedly different transport thermo-physical properties in nanofluids than conventional fluids in case of higher heat transfer performance have caught a lot of attention from researchers in the last decade. Greater-than-expected effective thermal conductivity and heat transfer coefficient make nanofluids great candidate utilizing for heat transfer applications.
Different methods in synthesis of nanofluids, as an important process and the first step in any experiment, is shortly discussed in this report. Various mechanisms to explain anomalously higher thermal conductivity in nanofluids, which have been suggested by different researchers, are summarised. However these mechanisms are not fully understood so far. Moreover theoretical and experimental investigations for thermal conductivity, viscosity and forced convective heat transfer in different studies are explained with reasonable details and are summarised in a number of tables. Nanofluids will be state-of-the-art and this new generation of heat transfer fluids will open a new horizon to the technology to have better performance in cooling of electrical and data systems. However commercialization is still in early stages and quite a lot of works are left to be done before big companies will be fully convinced to use nanofluids in their systems.
Place, publisher, year, edition, pages
2009. , 100 p.
nanofluids thermal conductivity viscosity heat transfer performance
IdentifiersURN: urn:nbn:se:kth:diva-77698OAI: oai:DiVA.org:kth-77698DiVA: diva2:492055
Master of Science - Sustainable Energy Engineering
Khodabandeh, RahmatollahPalm, Björn