Effect of Nanoparticles Concentration on Nanofluid Sprays for Cooling Applications

Result code in IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F00216305%3A26210%2F18%3APU130281" target="_blank" >RIV/00216305:26210/18:PU130281 - isvavai.cz</a>

Result on the web

<a href="http://www.lisbon-lasersymposium.org/LXLASER2018" target="_blank" >http://www.lisbon-lasersymposium.org/LXLASER2018</a>

DOI - Digital Object Identifier

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Result language

angličtina

Original language name

Effect of Nanoparticles Concentration on Nanofluid Sprays for Cooling Applications

Original language description

This study addresses the effect of nanoparticles nature and concentration on the fluid dynamics and particularly on the atomization characteristics of the resulting nanofluids. Nanoparticles of alumina (Al2O3) and Zinc Oxide (ZnO) are mixed in water-based solutions, for concentrations varying between 0.5% and 2% wt for alumina and between 0.01% and 0.1% wt for the zinc oxide particles. FeCl2 4H2O (0.1% wt) was also used to infer on the effect of the nature (material) of the particles in the physico-chemical properties of the resulting solutions. Citric acid (0.15%) was found to work well as a surfactant, being able to assure the stability of the prepared nanofluids during the experimental campaign. Spray morphology was characterized using high-speed visualization. Droplet size and velocity distributions were then probed using a 2 component Phase Doppler Anemometer. For the range of nanoparticles concentrations covered here, the results show a mild increase in the viscosity of the nanofluids for higher nanoparticle concentrations. This slightly larger viscosity mainly affects the primary breakup region of the spray (Z<10mm), narrowing the cone angle and increasing the Integral Sauter Mean Diameter of the droplets. However, in the region where the spray is already fully developed (Z>20mm), surface tension forces become dominant and the effect of adding the nanoparticles becomes negligible. Under these conditions the spray presents size and velocity distribution characteristics, which are suitable for cooling applications. However, tests are required to actually characterize the cooling performance of the spray impinging on a surface. In this context, preliminary results suggest the occurrence of a local modification on the wettability, probably caused by the deposition of the nanoparticles, which is leading to the decrease of the equilibrium contact angle. Such effect should be investigated in future studies.

Czech name

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Czech description

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Type

D - Article in proceedings

CEP classification

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OECD FORD branch

10305 - Fluids and plasma physics (including surface physics)

Project

<a href="/en/project/GA18-15839S" target="_blank" >GA18-15839S: Characterization of internal flow and spray for new modifications of spill-return pressure-swirl atomizers</a><br>

Continuities

P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)

Publication year

2018

Confidentiality

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Article name in the collection

PROCEEDINGS OF THE 19th INTERNATIONAL SYMPOSIUM ON APPLICATION OF LASER AND IMAGING TECHNIQUES TO FLUID MECHANICS

ISBN

978-989-20-9177-8

ISSN

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e-ISSN

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Number of pages

14

Pages from-to

1-14

Publisher name

Technical University Lisboa

Place of publication

Lisboa, Portugal

Event location

Častá - Píla

Event date

Nov 6, 2001

Type of event by nationality

EUR - Evropská akce

UT code for WoS article

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