Alumina Nanofluid for Spray Cooling Enhancement

Bansal, Aditya; Pyrtle, Frank

doi:10.1115/ht2007-32485

Cited by 19 publications

(18 citation statements)

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“…For other liquid impingement densities a decrease in HTC up to 32%, 32%, 26% for nanofluids with 1 wt.%, 0.1 wt.%, 0.01 wt% of carbon nanotubes, respectively, and up to 22%, 18%, 23% for nanofluids with 40 wt.%, 10 wt.%, 1 wt.% of Fe nanoparticles, respectively, in comparison with pure water was observed. The decrease in HTC was also observed in the work of Bansal and Pyrtle [2] by using alumina nanoparticles in water. Contrary to this the results in Chakraborty's work [1] show an increase in HTC by adding TiO 2 nanoparticles.…”

Section: Discussionsupporting

confidence: 67%

“…There are some papers about heat transfer by spray cooling with other nanofluids. Bansal and Pyrtle [2] examined alumina nanoparticles dispersed in water in concentrations of 0.25 to 0.505 wt.%. The initial temperature of the surface was 150 °C and the surface was cooled to 75 °C.…”

Section: Spray Cooling By Nanofluidsmentioning

confidence: 99%

“…Not many works of research have been focused on the cooling intensity by nanofluids and very few on the cooling intensity during spray cooling (e.g. Chakraborty et al [1], Bansal and Pyrtle [2]).…”

Section: Introductionmentioning

confidence: 99%

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Spray cooling by multi-walled carbon nanotubes and Fe nanoparticles

Bellerová

Pohanka

2011

Computational Methods and Experimental Measurements XV

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An experimental investigation of spray cooling performed with water based nanofluid containing multi-walled carbon nanotubes and Fe nanoparticles was carried out. The concentrations of carbon nanotubes in the liquid used in the experimental program were 1 wt.%, 0.1 wt.%, 0.01 wt.%, the concentrations of Fe nanoparticles were 40 wt.%, 10 wt.%, 1 wt.%. The liquid was sprayed on the surface by a full cone nozzle from distances of 40, 100 and 160 mm with flow rates of 1 to 2 kg/min (liquid impingement densities of 1 to 40 kg/m 2 s). A steel sensor measuring temperature history was cooled by spraying from 190 °C. The heat transfer coefficient was calculated at an interval of the surface temperature from 100 °C to 50 °C by inverse modelling, and compared with the heat transfer coefficient of water cooling. Using Fe nanoparticles showed a decrease of the heat transfer coefficient on the cooled surface. The majority of experiments with carbon nanotubes also showed a decrease of the heat transfer coefficient. However, there were some conditions during which an increase was observed.

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Section: Discussionsupporting

confidence: 67%

Section: Spray Cooling By Nanofluidsmentioning

confidence: 99%

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Spray cooling by multi-walled carbon nanotubes and Fe nanoparticles

Bellerová

Pohanka

2011

Computational Methods and Experimental Measurements XV

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“…For higher particle concentration, the particles stuck on the surface and the nanoparticles with a relatively long duration time would deteriorate the heat transfer. This may explain some inconsistency results of the previous studies [9,15]. Besides, from Table 3, the Prandtl number of Ag nanofluids is also obviously greater than that of MCNT nanofluids, which also strongly indicates that more bubbles (visualized) are generated in Ag nanofluids than those in MCNT nanofluids due to the fact that Ag enhances Unauthenticated Download Date | 6/7/19 1:37 AM boiling heat transfer more significantly (e.g.…”

Section: Boiling Curves (Steady State)mentioning

confidence: 35%

Spray cooling characteristics of nanofluids for electronic power devices

Hsieh¹,

Leu²,

Liu³

2016

Nano Online

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which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly credited.The performance of a single spray for electronic power devices using deionized (DI) water and pure silver (Ag) particles as well as multi-walled carbon nanotube (MCNT) particles, respectively, is studied herein. The tests are performed with a flat horizontal heated surface using a nozzle diameter of 0.5 mm with a definite nozzle-to-target surface distance of 25 mm. The effects of nanoparticle volume fraction and mass flow rate of the liquid on the surface heat flux, including critical heat flux (CHF), are explored. Both steady state and transient data are collected for the two-phase heat transfer coefficient, boiling curve/ cooling history, and the corresponding CHF. The heat transfer removal rate can reach up to 274 W/cm2 with the corresponding CHF enhancement ratio of 2.4 for the Ag/water nanofluids present at a volume fraction of 0.0075% with a low mass flux of 11.9 × 10−4 kg/cm2s.

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“…However, there have been not many research studies on the spray cooling characteristics performed with nanofluids. Bansal (2007) used an alumina nanofluid for the spray cooling of a heated copper surface, and an increase in the heat transfer capability of nanofluids was observed at lower temperatures and heat fluxes. But at high surface temperatures and heat fluxes, the performance of nanofluids deteriorated compared to that of water due to the deposition of nanoparticles on the surface.…”

Section: Introductionmentioning

confidence: 99%

A Study of the Effect of Nanoparticle Concentration on the Characteristics of Nanofluid Sprays

Kang

Marengo

Begg

2019

JAFM

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Nanofluids are metallic or nonmetallic, nanometer-sized particles dispersed in liquid. They can be used in various fields to increase heat transfer rates, as the thermal conductivity of nanofluids can be increased significantly. Nanofluids may be used as a good alternative coolant in spray cooling applications. This study conducted experiments to compare spray characteristics, such as droplet diameters and velocities, between water and alumina nanofluid sprays. The mass ratio of alumina nanoparticles was varied from 0.2 to 0.5 weight percentages (wt.%) and the spray injection pressure was varied between 0.2 and 0.3 MPa. The local distributions of droplet sizes and velocities along the spray axial and radial directions were measured by a laser doppler instrument. Generally, the spray characteristics of nanofluid sprays is significantly different from that of water sprays. The average droplet diameters of the fluids tested increased in an approximately linear manner with the increase in the mass ratio of nanoparticles up to 0.4 wt.%, whereas the average droplet velocities decreased. In the case of the nanofluid spray of 0.5 wt.%, the increase in droplet diameters and the decrease in droplet velocities were much more marked, departing from the linear relationship. This unusual behavior could also be observed in the local distributions of droplet diameters and velocities along the axial and radial directions. Further research studies are required to reveal how the addition of nanoparticles affects the atomization mechanism of nanofluids. The difference in the spray characteristics of nanofluid sprays from that of water sprays should be taken into consideration when the cooling effectiveness of nanofluids and water in spray cooling is compared.

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Alumina Nanofluid for Spray Cooling Enhancement

Cited by 19 publications

References 0 publications

Spray cooling by multi-walled carbon nanotubes and Fe nanoparticles

Spray cooling by multi-walled carbon nanotubes and Fe nanoparticles

Spray cooling characteristics of nanofluids for electronic power devices

A Study of the Effect of Nanoparticle Concentration on the Characteristics of Nanofluid Sprays

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