Details
| Translated title of the contribution | Migrationsverhalten von Partikeln bei isobarer und Flashverdampfung von Nanofluiden |
|---|---|
| Original language | English |
| Pages (from-to) | 101-109 |
| Number of pages | 9 |
| Journal | Forschung im Ingenieurwesen |
| Volume | 80 |
| Issue number | 3-4 |
| Early online date | 24 Aug 2016 |
| Publication status | Published - Dec 2016 |
Abstract
When nanoparticles are dispersed in a base fluid, the thermophysical properties of the resulting nanofluids can vary considerably from those of the pure basefluid. Thus, numerous applications for nanofluids have been suggested in the past, e. g. the use in solar thermal absorbers. With increasing heat fluxes and temperatures, a phase change of the absorber fluid can be desirable for instance in solar steam generators. This paper deals with the fundamental question of the nanoparticle migration behavior while the nanofluid is evaporating, as it is commonly presumed that solid particles do not migrate into the gas phase. This assumption however is, to the authors knowledge, insufficiently described in the literature as due to the extremely small size of the nanoparticles, abnormal behavior seems possible. By conducting experiments with isobaric and flash evaporation it is shown, that the classical theory of solid-liquid equilibrium actually applies at this scale and the nanoparticles are entirely separated from the gas phase by evaporation. The particles found in the gas phase can entirely be attributed to entrainment effects.
ASJC Scopus subject areas
- Engineering(all)
- General Engineering
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In: Forschung im Ingenieurwesen, Vol. 80, No. 3-4, 12.2016, p. 101-109.
Research output: Contribution to journal › Article › Research › peer review
}
TY - JOUR
T1 - Particle migration in isobaric and flash evaporation of nanofluids
AU - Eggers, Jan Rudolf
AU - Lange, Eckart Matthias
AU - Kabelac, Stephan
N1 - Publisher Copyright: © 2016, Springer-Verlag Berlin Heidelberg. Copyright: Copyright 2017 Elsevier B.V., All rights reserved.
PY - 2016/12
Y1 - 2016/12
N2 - When nanoparticles are dispersed in a base fluid, the thermophysical properties of the resulting nanofluids can vary considerably from those of the pure basefluid. Thus, numerous applications for nanofluids have been suggested in the past, e. g. the use in solar thermal absorbers. With increasing heat fluxes and temperatures, a phase change of the absorber fluid can be desirable for instance in solar steam generators. This paper deals with the fundamental question of the nanoparticle migration behavior while the nanofluid is evaporating, as it is commonly presumed that solid particles do not migrate into the gas phase. This assumption however is, to the authors knowledge, insufficiently described in the literature as due to the extremely small size of the nanoparticles, abnormal behavior seems possible. By conducting experiments with isobaric and flash evaporation it is shown, that the classical theory of solid-liquid equilibrium actually applies at this scale and the nanoparticles are entirely separated from the gas phase by evaporation. The particles found in the gas phase can entirely be attributed to entrainment effects.
AB - When nanoparticles are dispersed in a base fluid, the thermophysical properties of the resulting nanofluids can vary considerably from those of the pure basefluid. Thus, numerous applications for nanofluids have been suggested in the past, e. g. the use in solar thermal absorbers. With increasing heat fluxes and temperatures, a phase change of the absorber fluid can be desirable for instance in solar steam generators. This paper deals with the fundamental question of the nanoparticle migration behavior while the nanofluid is evaporating, as it is commonly presumed that solid particles do not migrate into the gas phase. This assumption however is, to the authors knowledge, insufficiently described in the literature as due to the extremely small size of the nanoparticles, abnormal behavior seems possible. By conducting experiments with isobaric and flash evaporation it is shown, that the classical theory of solid-liquid equilibrium actually applies at this scale and the nanoparticles are entirely separated from the gas phase by evaporation. The particles found in the gas phase can entirely be attributed to entrainment effects.
UR - http://www.scopus.com/inward/record.url?scp=84983378049&partnerID=8YFLogxK
U2 - 10.1007/s10010-016-0205-x
DO - 10.1007/s10010-016-0205-x
M3 - Article
AN - SCOPUS:84983378049
VL - 80
SP - 101
EP - 109
JO - Forschung im Ingenieurwesen
JF - Forschung im Ingenieurwesen
SN - 0015-7899
IS - 3-4
ER -