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Heat Transfer in Nanoscale Colloids

Show simple item record 2014-04-07T08:49:39Z und 2017-10-24T12:04:49Z 2014-04-07T08:49:39Z und 2017-10-24T12:04:49Z 2014-04-07T08:49:39Z
dc.identifier.uri und
dc.title Heat Transfer in Nanoscale Colloids en
ethesis.discipline Theoretical Physics en
ethesis.discipline Teoreettinen fysiikka fi
ethesis.discipline Teoretisk fysik sv
ethesis.department Institutionen för fysik sv
ethesis.department Department of Physics en
ethesis.department Fysiikan laitos fi
ethesis.faculty Matematisk-naturvetenskapliga fakulteten sv
ethesis.faculty Matemaattis-luonnontieteellinen tiedekunta fi
ethesis.faculty Faculty of Science en
ethesis.faculty.URI Helsingfors universitet sv University of Helsinki en Helsingin yliopisto fi
dct.creator Saarinen, Sampo
dct.issued 2014
dct.language.ISO639-2 eng
dct.abstract Nanofluids are a new class of colloids that is generally classified as solid particle suspensions such that the particle diameter is less than 100 nm. In the last decade they have exhibited anomalously high thermal conductivity compared to classical models. Additionally, nanoscale emulsions have shown similar behavior but have gathered less attention than solid particle nanofluids. The optimal preparation of nanoemulsions is not straightforward. Multiple factors have an effect on the final size distribution and therefore optimization is required. Models for the anomalous behavior include effects of the Brownian motion, formation of particle clusters and ordering of liquid into a layer of high conductivity around the particles. In our measurements for nanoscale emulsions, we however observed no significant deviation from the classical models. Besides conduction, nanofluids could also be utilized in convective heat transfer applications. The research on this field is more limited but indicates that increases in heat transfer exist also in convective transport. We perform heat transfer experiments on several n-decane in water nanoemulsions and nanoscale micelle colloids in the transition and turbulent flow regime. Our results indicate that while the thermal properties of the samples were usually worse for convective applications than the reference, the heat transfer properties were similar or better especially at high Reynolds numbers. en
dct.language en
ethesis.language English en
ethesis.language englanti fi
ethesis.language engelska sv
ethesis.thesistype pro gradu-avhandlingar sv
ethesis.thesistype pro gradu -tutkielmat fi
ethesis.thesistype master's thesis en
dct.identifier.urn URN:NBN:fi-fe2017112252466
dc.type.dcmitype Text

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