Pool boiling of Novec 7300 and self-rewetting fluids on electrically-assisted supersonically solution-blown, copper-plated nanofibers

Sahu, Rakesh P.; Sinha-Ray, Sumit; Sinha-Ray, Suman; Yarin, Alexander L.

doi:10.1016/j.ijheatmasstransfer.2015.11.094

Cited by 47 publications

(24 citation statements)

References 39 publications

(42 reference statements)

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“…In recent years, saturated long carbon alcohol aqueous solutions have also exhibited a positive role in enhancing the HTC . A study from Sahu et al suggested that the wall superheat of the heptanol aqueous solution was lower than that of the distilled water under the same heat flux conditions. Hu et al reported that the small bubble separation diameter could dramatically enhance the HTC and CHF under the condition of self‐wetting solution.…”

Section: Introductionmentioning

confidence: 99%

Experimental study of nucleate pool boiling heat transfer of self‐rewetting solution by surface functionalization with TiO₂ nanostructure

Zhang

Wang

et al. 2019

Can J Chem Eng

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A titanium plate with titanium dioxide nanotube was prepared with the anodic oxidation process. The heat transfer through this plate was studied with quantitative heptanol solution as self-rewetting solution. The microstructure of this nano-structure surface was characterized by SEM and the surface tension of the self-rewetting solution on it was measured by the static contact angle. The results indicated that the heat transfer coefficient (HTC) and the critical heat flux (CHF) were significantly improved with the increasing concentration of heptanol. In the 0.1 mass% heptanol solution, the best heat transfer enhancement effect was obtained. The HTC is 22.46 kW Á m À2 Á K À1 and CHF is 536.64 kW Á m À2 , which were increased by 121 and 62.9 % more than those in the distilled water. According to the experimental phenomenon and mechanism analysis, the surface of the nanotube has a more effective vaporization core, greater roughness, and better wettability. Combined with the special double surface tension gradient characteristic of the self-wetting solution, the hot and cold liquid forms a microcirculation and the synergistic superposition of the driving force strengthens. The system can produce tiny and fine bubbles under low superheat, detach quickly, transfer heat quickly, and perform secondary wetting in time to achieve synergistic enhanced boiling heat transfer.

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Section: Introductionmentioning

confidence: 99%

Experimental study of nucleate pool boiling heat transfer of self‐rewetting solution by surface functionalization with TiO₂ nanostructure

Zhang

Wang

et al. 2019

Can J Chem Eng

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“…At the heat flux of 100 kW/m 2 , the HTC increased by 21-35%. In the paper [4], the subject of the study was pool boiling of Novec-7300 fluid and self-rewetting water-heptanol mixtures on bare copper surface and a copper surface coated with copper-plated nanofibers. Authors have found that the heat transfer coefficients were greater for surfaces with cooper-plated nanofibre.…”

Section: Introductionmentioning

confidence: 99%

Boiling of a refrigerant of low GWP on the surface with copper microchannels

Kaniowski

Pastuszko

2018

E3S Web Conf.

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The boiling curves and heat transfer coefficients between the heating surface and fluid were investigated in the paper. Copper samples with horizontal microchannels of rectangular cross-section, variable depth and width were the objects of the study. The following geometrical parameters have been used: microchannel width 0.2; 0.3 and 0.4 mm, depth between 0.2 and 0.5 mm (change every 0.1 mm). Boiling refrigerant was Novec-649 (GWP = 1), and the experiment was performed at atmospheric pressure. Geometrical parameters impact, within a given range of heat flux 3 – 130 kW/m2, on the heat transfer process was determined.

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“…Pool boiling is highly effective in heat removal since it involves significant latent heat of evaporation associated with the nucleate boiling regimes, which guarantees high heat fluxes. This is an attractive feature for cooling of high-power microelectronics in ground and space applications [3][4][5][6][7], metallurgical quenching [1], etc. The severe limitation on the heat removal in pool boiling, namely the inception of the boiling crisis or the CHF sets in in the most attractive domain of the heat flux regimes, which, unfortunately, results in a rapid, practically uncontrollable bubble merging at the heater surface and transition to film boiling.…”

Section: Introductionmentioning

confidence: 99%

“…Different methods were employed to enhance heat removal in pool boiling, e.g. deposition of nanofibers on the heater surface [4][5][6][7], nano-porous textured finishes [8], embedded arrays of low-conductive epoxy [9], modification of the surface wettability [10,11], and miniaturization [12]. Such measures were able to delay the CHF onset, but definitely not to fully eliminate it.…”

Section: Introductionmentioning

confidence: 99%

Exponential vaporization fronts and critical heat flux in pool boiling

Staszel

Yarin

2018

International Communications in Heat and Mass Transfer

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Here we study the inception and propagation of vaporization fronts and transition to the critical heat flux (CHF) and film-boiling regime triggered by a steep, almost instantaneous increase in the heat release from a strip heater submerged in Novec 7300 liquid. The propagation path of the resulting vaporization front along the strip heater is measured and shown to be exponentially increasing in time, in distinction from the previous reports in literature claiming that the increase is only linear. Since the previous experiments employed such liquids as water, refrigerants, acetone, ethanol, and alkali metals, which possess relatively high latent heat of evaporation and thus require a relatively high power to be supplied, the heater burnout at the inception of the CHF and film boiling was too fast to allow for longer-time observations. Accordingly, the previous works observed only an extremely short-time asymptotics of the propagation process, which means the short-time expansion of the exponential function, which is linear. On the other hand, in the experiments with Novec 7300 liquid, the heater burnout is delayed due to a much lower latent heat of evaporation, thus allowing for a much longer observation of the propagation path, which appears to be exponentially increasing in time. The experiments were preceded by our theoretical prediction of such a behavior, and this theory is also described in the present work. Due to the fact that this theory has been corroborated by the experimental data, the theory yields an adequate explanation and description of the CHF trigger and film boiling inception.

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Pool boiling of Novec 7300 and self-rewetting fluids on electrically-assisted supersonically solution-blown, copper-plated nanofibers

Cited by 47 publications

References 39 publications

Experimental study of nucleate pool boiling heat transfer of self‐rewetting solution by surface functionalization with TiO₂ nanostructure

Experimental study of nucleate pool boiling heat transfer of self‐rewetting solution by surface functionalization with TiO₂ nanostructure

Boiling of a refrigerant of low GWP on the surface with copper microchannels

Exponential vaporization fronts and critical heat flux in pool boiling

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Pool boiling of Novec 7300 and self-rewetting fluids on electrically-assisted supersonically solution-blown, copper-plated nanofibers

Cited by 47 publications

References 39 publications

Experimental study of nucleate pool boiling heat transfer of self‐rewetting solution by surface functionalization with TiO2 nanostructure

Experimental study of nucleate pool boiling heat transfer of self‐rewetting solution by surface functionalization with TiO2 nanostructure

Boiling of a refrigerant of low GWP on the surface with copper microchannels

Exponential vaporization fronts and critical heat flux in pool boiling

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Product

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Experimental study of nucleate pool boiling heat transfer of self‐rewetting solution by surface functionalization with TiO₂ nanostructure

Experimental study of nucleate pool boiling heat transfer of self‐rewetting solution by surface functionalization with TiO₂ nanostructure