Imperial College London
Alternate

Dr Antonis Sergis

Faculty of Engineering, Department of Mechanical Engineering

Lecturer
 
 
 
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Contact

 

a.sergis09 Website

 
 
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Assistant

 

Ms Eniko Jarecsni +44 (0)20 7594 7029

 
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Location

 

619City and Guilds BuildingSouth Kensington Campus

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Summary

 

Publications

Citation

BibTex format

@article{Sergis:2017:10.1016/j.expthermflusci.2017.12.014,
author = {Sergis, A and Hardalupas, I and Barrett, T},
doi = {10.1016/j.expthermflusci.2017.12.014},
journal = {Experimental Thermal and Fluid Science},
pages = {32--44},
title = {Isothermal analysis of nanofluid flow inside HyperVapotrons using particle image velocimetry},
url = {http://dx.doi.org/10.1016/j.expthermflusci.2017.12.014},
volume = {93},
year = {2017}
}
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RIS format (EndNote, RefMan)

TY  - JOUR
AB  - Nanofluids are advanced two-phase coolants that exhibit heat transfer augmentation phenomena. Extensive research has been performed since the year 2000 onwards to understand the physical mechanisms of heat transfer in nanofluids when employed inside traditional heat exchanging geometries. The focus of this paper is to understand if and how the geometry of heat exchangers might be potentially affecting the nanofluid coolant flow boundary conditions established and how this might be hence further affecting their thermal characteristics. HyperVapotrons are highly robust and efficient heat exchangers able to transfer high heat fluxes of the order of 10–20MW/m2. They employ a complex two-phase heat transfer mechanism which is strongly linked to the hydrodynamic structures present in the coolant flow inside the devices. A cold isothermal nanofluid flow is established inside two HyperVapotron model replicas. A high spatial resolution (30μm) visualisation of the nanofluid flow fields inside each replica is measured and compared to those present during the use of a traditional coolant (water). Significant geometry specific changes are evident with the use of dilute nanofluids which is something unexpected and novel. Evidence of a shear thinning mechanism is found inside the momentum boundary layer of the nanofluid flows that might prove beneficial to the coolant pumping power losses when using nanofluids instead of water and is expected to affect their thermal performance from a hydrodynamic point of view.
AU  - Sergis,A
AU  - Hardalupas,I
AU  - Barrett,T
DO  - 10.1016/j.expthermflusci.2017.12.014
EP  - 44
PY  - 2017///
SN  - 0894-1777
SP  - 32
TI  - Isothermal analysis of nanofluid flow inside HyperVapotrons using particle image velocimetry
T2  - Experimental Thermal and Fluid Science
UR  - http://dx.doi.org/10.1016/j.expthermflusci.2017.12.014
UR  - http://hdl.handle.net/10044/1/57355
VL  - 93
ER  -
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