Influence of nanoparticle size and gap size on nucleate boiling using HFE7100

Souza, Reinaldo Rodrigues de; Passos, Júlio César; Cardoso, Elaine Maria

doi:10.1016/j.expthermflusci.2013.11.001

Cited by 25 publications

(26 citation statements)

References 16 publications

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“…New results were obtained from tests on three kind of surfaces, a smooth heating surface, with R a = 0.02 µm, and two new nanostructures formed by the deposition of maghemite nanoparticles of two diameters, 10 and 80 nm, under confined or unconfined conditions. The values reported herein are compared with the results presented in [27], where the reference copper surface had a greater degree of roughness, R a = 0.16 µm. These results can aid the design of new equipment with space restrictions or in cases where the operational principle is based on flow boiling in microchannels.…”

Section: Nomenclaturementioning

confidence: 90%

“…The aim of this study is to complement the work of Souza et al [27], who studied the saturated nucleate boiling heat transfer of HFE 7100 on a copper surface with different roughness values due to the presence of maghemite nanoparticles of two diameters, 10 and 80 nm. New results were obtained from tests on three kind of surfaces, a smooth heating surface, with R a = 0.02 µm, and two new nanostructures formed by the deposition of maghemite nanoparticles of two diameters, 10 and 80 nm, under confined or unconfined conditions.…”

Section: Nomenclaturementioning

confidence: 95%

“…Fig. 1 shows a schematic of the experimental apparatus developed to perform the tests, see also Souza et al [27]. The boiling chamber is installed in the center of an external chamber, both assembled between two horizontal AISI 316 plates.…”

Section: Nomenclaturementioning

confidence: 99%

“…Souza et al [27] presented experimental results for HFE 7100 nucleate boiling on copper discs, nanostructured with maghemite (10 nm and 80 nm diameters) using the nanofluid evaporation technique. The surface roughness (R a ) was 0.16 µm before the nanoparticle deposition.…”

Section: Introductionmentioning

confidence: 99%

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Confined and unconfined nucleate boiling of HFE7100 in the presence of nanostructured surfaces

Souza

Cardoso

Passos

2018

Experimental Thermal and Fluid Science

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A B S T R A C TThis article presents experimental results for the confined and unconfined nucleate boiling of saturated HFE7100 (C 4 F 9 OCH 3 ) at atmospheric pressure and using nanostructured copper discs as heating surfaces. The nanostructures studied consisted of nanoparticles of maghemite (Fe 2 O 3 ) on the heating surface, comprised of a copper disc. Different values for the diameter (10 and 80 nm) and roughness (R a = 0.02 µm and 0.16 µm) were studied. The nanoparticle adhesion on the heating surface plays a more important role in the confined boiling process than the surface roughness. As an original result, it was demonstrated that for a confinement with a gap length of 0.1 mm and heat flux of 40 kW/m 2 the heat transfer coefficient (HTC) increased by 31% and 100% for the cases with the deposition of nanoparticles of 10 nm and 80 nm, respectively. However, without the nanoparticles the HTC decreased by 21% when compared with the reference case, that is, a smooth plate (R a = 0.02 µm) and unconfined boiling.

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Section: Nomenclaturementioning

confidence: 90%

Section: Nomenclaturementioning

confidence: 95%

Section: Nomenclaturementioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Confined and unconfined nucleate boiling of HFE7100 in the presence of nanostructured surfaces

Souza

Cardoso

Passos

2018

Experimental Thermal and Fluid Science

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“…8 HFE-7100 was also employed to investigate the CHF and post-CHF characteristics during the falling jets on the surface with localized electrostatic fields 9 or the heat transfer enhancement of the pool boiling on the nanoparticle-coated surface. 10 In recent years, many approaches have been reported to improve the boiling heat transfer in the microchannel. For example, Yang et al 11 developed the microchannel with nanowire-coated surfaces to enhance the flow boiling heat transfer of HFE-7000.…”

Section: Introductionmentioning

confidence: 99%

Critical heat flux enhancement of HFE-7100 flow boiling in a minichannel heat sink with saw-tooth structures

Chung

Lin

et al. 2017

Advances in Mechanical Engineering

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A heat sink with convective boiling in micro-or mini-channels is with great potential to meet the requirement of the high heat dissipation of the electronic devices. This study investigates the flow boiling of HFE-7100, having a suitable boiling temperature at atmospheric pressure and dielectric property, in the minichannel heat sink with the modified surface (namely, the saw-tooth structure). The effect of the system pressure on the boiling characteristics was also studied. The results reveal that the critical heat flux can be significantly improved by introducing the saw-tooth structures on the channel surface or boosting the system pressure as well as by increasing the mass flux. Compared to the non-modified channel, the enhancements of the critical heat flux for the parallel and counter saw-tooth channels are 44% and 36%, respectively, at the small mass flux. The boiling visualization further indicates that the minichannels with the saw-tooth structures interrupt the boundary layer and restrain the coalescence of the bubble, which may be the reason for the critical heat flux enhancement. Moreover, the degree of the critical heat flux enhancement, contributed by the saw-tooth modification of the channel, decreases with an increase in the mass flux.

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On the effect of silver nanoparticles deposition on porous copper foams on pool boiling heat transfer enhancement: an experimental visualization

et al. 2021

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Influence of nanoparticle size and gap size on nucleate boiling using HFE7100

Cited by 25 publications

References 16 publications

Confined and unconfined nucleate boiling of HFE7100 in the presence of nanostructured surfaces

Confined and unconfined nucleate boiling of HFE7100 in the presence of nanostructured surfaces

Critical heat flux enhancement of HFE-7100 flow boiling in a minichannel heat sink with saw-tooth structures

On the effect of silver nanoparticles deposition on porous copper foams on pool boiling heat transfer enhancement: an experimental visualization

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