Imperial College London
Alternate

Dr Konstantinos Kouloulias

Faculty of Engineering, Department of Mechanical Engineering

Academic Visitor
 
 
 
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Contact

 

k.kouloulias13

 
 
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Location

 

City and Guilds BuildingSouth Kensington Campus

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Summary

 

Publications

Citation

BibTex format

@article{Kouloulias:2019:10.1007/s10973-018-7631-y,
author = {Kouloulias, K and Sergis, A and Hardalupas, I},
doi = {10.1007/s10973-018-7631-y},
journal = {Journal of Thermal Analysis and Calorimetry: an international forum for thermal studies},
pages = {3181--3189},
title = {Assessing the flow characteristics of nanofluids during turbulent natural convection},
url = {http://dx.doi.org/10.1007/s10973-018-7631-y},
volume = {135},
year = {2019}
}
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RIS format (EndNote, RefMan)

TY  - JOUR
AB  - High-performance cooling is of vital importance for the cutting-edge technology of today, from nanoelectronic mechanical systems to nuclear reactors. Advances in nanotechnology have allowed the development of a new category of coolants, termed nanofluids that have the potential to enhance the thermal performance of conventional heat transfer fluids. At the present time, nanofluids are a controversial research theme, since there is yet no conclusive answer to explain the underlying physical mechanisms of heat transfer. The current study investigates experimentally the heat and mass transfer behaviour of dilute Al2O3–H2O nanofluids under turbulent natural convection—Rayleigh number of the order of 109—in a cubic Rayleigh–Bénard cell with optical access. Traditional heat transfer measurements were combined with a velocimetry method to obtain a deeper understanding of the impact of nanoparticles on the heat transfer performance of the base fluid. Particle image velocimetry was employed to quantify the resulting mean velocity field and flow structures in dilute nanofluids under natural convection, at three parallel planes inside the cubic cell. All the results were compared with that for the base fluid, i.e. deionised water. It was observed that the presence of a minute amount of Al2O3 nanoparticles in deionised water, φv = 0.00026 vol.%, considerably modifies the mass transfer behaviour of the fluid in the bulk region of turbulent Rayleigh–Bénard convection. Simultaneously, the general heat transport, as expressed by the Nusselt number, remained unaffected within the experimental uncertainty.
AU  - Kouloulias,K
AU  - Sergis,A
AU  - Hardalupas,I
DO  - 10.1007/s10973-018-7631-y
EP  - 3189
PY  - 2019///
SN  - 1388-6150
SP  - 3181
TI  - Assessing the flow characteristics of nanofluids during turbulent natural convection
T2  - Journal of Thermal Analysis and Calorimetry: an international forum for thermal studies
UR  - http://dx.doi.org/10.1007/s10973-018-7631-y
UR  - https://link.springer.com/article/10.1007/s10973-018-7631-y
UR  - http://hdl.handle.net/10044/1/62962
VL  - 135
ER  -
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