Convective heat transfer performance of aggregate-laden nanofluids
(2016) In International Journal of Heat and Mass Transfer 93. p.1107-1115- Abstract
- With the recent progress in nanotechnology, nanofluids are emerging as a new class of heat transfer fluids formed by adding nanometer-sized structures (e.g., particles, fibers, tubes) in conventional base fluids (e.g., water, ethylene glycol, engine oil). Due to attractive van der Waals forces, nanoparticles tend to agglomerate to form aggregates in nanofluids to form the so-called aggregate-laden nanofluids. Aggregation affects the nanofluid properties such as thermal conductivity and viscosity and further affects the heat transfer performance. The discrepancies regarding the influence of nanoparticles on thermophysical properties and heat transfer characteristics in the literature might arise due to nanoparticle aggregation. Firstly,... (More)
- With the recent progress in nanotechnology, nanofluids are emerging as a new class of heat transfer fluids formed by adding nanometer-sized structures (e.g., particles, fibers, tubes) in conventional base fluids (e.g., water, ethylene glycol, engine oil). Due to attractive van der Waals forces, nanoparticles tend to agglomerate to form aggregates in nanofluids to form the so-called aggregate-laden nanofluids. Aggregation affects the nanofluid properties such as thermal conductivity and viscosity and further affects the heat transfer performance. The discrepancies regarding the influence of nanoparticles on thermophysical properties and heat transfer characteristics in the literature might arise due to nanoparticle aggregation. Firstly, three performance comparison criteria for nanofluids were proposed for thermally developing laminar flow, fully developed laminar flow and fully developed turbulent flow to evaluate the nanofluid efficiency as coolants. Secondly, parametric effects of aggregates on nanofluid viscosity and thermal conductivity were investigated. The cooling efficiency of the aggregate-laden nanofluids depends on aggregate parameters such as aggregate ratios, interfacial thermal resistance, volume fraction of aggregates in nanofluids and volume fraction of nanoparticles in the aggregates. One method to tailor the aggregate morphology is presented by dispersing nanoparticles of different size into a base fluid. By this method, the volume fraction of nanoparticles in the aggregates might increase, which thus enhances the nanofluid effectiveness due to reduction of viscosity. (Less)
Please use this url to cite or link to this publication:
https://lup.lub.lu.se/record/8312406
- author
- Wu, Zan LU and Sundén, Bengt LU
- organization
- publishing date
- 2016
- type
- Contribution to journal
- publication status
- published
- subject
- keywords
- Aggregate, Nanofluid, Performance comparison criterion, Heat transfer, Thermal conductivity, Viscosity
- in
- International Journal of Heat and Mass Transfer
- volume
- 93
- pages
- 1107 - 1115
- publisher
- Pergamon Press Ltd.
- external identifiers
-
- wos:000367107700101
- scopus:84947996361
- ISSN
- 0017-9310
- DOI
- 10.1016/j.ijheatmasstransfer.2015.11.032
- language
- English
- LU publication?
- yes
- id
- 377bcc49-5bde-488a-bdb7-31947fc179a9 (old id 8312406)
- date added to LUP
- 2016-04-01 10:37:32
- date last changed
- 2022-04-20 03:46:34
@article{377bcc49-5bde-488a-bdb7-31947fc179a9,
abstract = {{With the recent progress in nanotechnology, nanofluids are emerging as a new class of heat transfer fluids formed by adding nanometer-sized structures (e.g., particles, fibers, tubes) in conventional base fluids (e.g., water, ethylene glycol, engine oil). Due to attractive van der Waals forces, nanoparticles tend to agglomerate to form aggregates in nanofluids to form the so-called aggregate-laden nanofluids. Aggregation affects the nanofluid properties such as thermal conductivity and viscosity and further affects the heat transfer performance. The discrepancies regarding the influence of nanoparticles on thermophysical properties and heat transfer characteristics in the literature might arise due to nanoparticle aggregation. Firstly, three performance comparison criteria for nanofluids were proposed for thermally developing laminar flow, fully developed laminar flow and fully developed turbulent flow to evaluate the nanofluid efficiency as coolants. Secondly, parametric effects of aggregates on nanofluid viscosity and thermal conductivity were investigated. The cooling efficiency of the aggregate-laden nanofluids depends on aggregate parameters such as aggregate ratios, interfacial thermal resistance, volume fraction of aggregates in nanofluids and volume fraction of nanoparticles in the aggregates. One method to tailor the aggregate morphology is presented by dispersing nanoparticles of different size into a base fluid. By this method, the volume fraction of nanoparticles in the aggregates might increase, which thus enhances the nanofluid effectiveness due to reduction of viscosity.}},
author = {{Wu, Zan and Sundén, Bengt}},
issn = {{0017-9310}},
keywords = {{Aggregate; Nanofluid; Performance comparison criterion; Heat transfer; Thermal conductivity; Viscosity}},
language = {{eng}},
pages = {{1107--1115}},
publisher = {{Pergamon Press Ltd.}},
series = {{International Journal of Heat and Mass Transfer}},
title = {{Convective heat transfer performance of aggregate-laden nanofluids}},
url = {{http://dx.doi.org/10.1016/j.ijheatmasstransfer.2015.11.032}},
doi = {{10.1016/j.ijheatmasstransfer.2015.11.032}},
volume = {{93}},
year = {{2016}},
}