Numerical analysis of performance uncertainty of heat exchangers operated with nanofluids
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Mostrar el registro completo del ítemcomunitat-uji-handle:10234/9
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Título
Numerical analysis of performance uncertainty of heat exchangers operated with nanofluidsAutoría
Fecha de publicación
2022-03-07Editor
Elsevier Ltd.ISSN
2666-2027Cita bibliográfica
Kamenik, B., et al. "Numerical analysis of performance uncertainty of heat exchangers operated with nanofluids." International Journal of Thermofluids 14 (2022): 100144.Tipo de documento
info:eu-repo/semantics/articleVersión
info:eu-repo/semantics/publishedVersionPalabras clave / Materias
Resumen
In this paper, we analyse the performance of two types of heat exchangers with nanofluid as the working fluid in turbulent flow regime ( 4, 000–180, 000). Based on the experimental uncertainty of the thermophysical ... [+]
In this paper, we analyse the performance of two types of heat exchangers with nanofluid as the working fluid in turbulent flow regime ( 4, 000–180, 000). Based on the experimental uncertainty of the thermophysical properties of the nanofluids, we use the Stochastic Collocation Method in combination with a deterministic simulation programme to estimate the expected value and variance of the targeted engineering results. We find that the uncertainty in the thermal conductivity of the nanofluid has the largest impact on the uncertainty in the heat exchanger performance, while the uncertainty in the density can be neglected. The uncertainties in the Nusselt number, friction factor and several figures of merit are smaller than the change in these performance estimators due to a change in nanoparticle concentration. Predictions for heat exchanger performance agree much better with experimental data when used with empirical heat transfer correlations developed specifically for nanofluids than with the general Gnielinski correlation developed for pure fluids.
We also perform a correlation analysis of the relationships between heat exchanger performance enhancement and pressure drop to show that they are strongly correlated. We find that the relationship between the concentration of nanoparticles and the Nusselt number is statistically insignificant. The relationship is significant, indicating the importance of flow conditions. The correlation between nanoparticle concentration and friction factor is significant and strong. This result suggests that the optimisation of the thermal-hydrodynamic behaviour should be sought in a parameter other than the nanoparticle volume fraction. [-]
Publicado en
International Journal of Thermofluids, Vol. 14 (May 2022)Entidad financiadora
COST (European Cooperation in Science and Technology)
Código del proyecto o subvención
IG15119
Título del proyecto o subvención
Nanofluids for convective heat transfer devices (Nanoconvex).
Derechos de acceso
© 2022 The Authors. Published by Elsevier Ltd. This is an open access article under the CC BY-NC-ND license
info:eu-repo/semantics/openAccess
info:eu-repo/semantics/openAccess
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