Heat transfer enhancement of subcooled pool boiling with self-rewetting fluid

Hu, Yi; Zhang, Suling; Li, Xuanyou; Wang, Shuangfeng

doi:10.1016/j.ijheatmasstransfer.2014.11.081

Cited by 37 publications

(19 citation statements)

References 15 publications

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“…Surfactant addition could enhance boiling heat transfer which have been demonstrated by many researchers such as Morgan et al [3], Hetsroni et al [4] and Hu et al [5]. Morgan et al found that decreasing surface tension by surfactant additives could enhance boiling heat transfer coefficient.…”

Section: Introductionmentioning

confidence: 91%

“…The experimental results implied that surfactant addition could enhance boiling heat transfer and there was a concentration for best heat transfer enhancement. Apart from surfactant addition, some researchers such as Hu et al [5] utilized fluids addition with low surface tension (dilute heptanol aqueous solution) to enhance boiling heat transfer. They found that the heat transfer coefficient was enhanced up to 12.5% and the critical heat flux (CHF) was increased up to 2.52 times of that in water.…”

Section: Introductionmentioning

confidence: 99%

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On the mechanism of boiling heat transfer enhancement by surfactant addition

Wang

2016

International Journal of Heat and Mass Transfer

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Section: Introductionmentioning

confidence: 91%

Section: Introductionmentioning

confidence: 99%

On the mechanism of boiling heat transfer enhancement by surfactant addition

Wang

2016

International Journal of Heat and Mass Transfer

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“…The thermal problem, given by (10), (17), (20), (23) and 24, decouples from the hydrodynamic problem and may be solved separately to yield simply…”

Section: Problem Solutionmentioning

confidence: 99%

“…In particular, for temperatures above T min the surface tension of such fluids is an increasing function of temperature, and as a result Marangoni effects draw fluid towards regions with higher temperature. This unusual behaviour has stimulated interest in the potential use of such fluids in various heat-transfer applications, such as pool boiling, spray boiling and heat pipes, because in these contexts it tends to reduce dry-out, and hence to enhance the overall heat transfer, by rewetting hot surfaces, and so has led to them being termed "self-rewetting" fluids (see, for example, the work of Zhang [5], Abe, Iwasaki and Tanaka [6,7], Abe [8], Savino and collaborators [9][10][11][12][13][14][15], Hu et al [16], Hu, Zhang and Wang [17], and Wu [18]).…”

Section: Introductionmentioning

confidence: 99%

Unsteady motion of a long bubble or droplet in a self-rewetting system

et al. 2018

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Motivated by the potential use of self-rewetting fluids (i.e. fluids that exhibit a non-monotonic variation of surface tension with temperature) in various heat-transfer applications, in the present work we formulate and analyse a theoretical model for the unsteady motion of a long bubble or droplet in a self-rewetting system in a non-uniformly heated tube due to a combination of Marangoni effects due to the variation of surface tension with temperature, gravitational effects due to the density difference between the two fluids, and an imposed background flow along the tube. We find that the evolution of the shape (but not of the position) of the bubble or droplet is driven entirely by Marangoni effects, and depends on the initial value of its radius in relation to a critical value. In the case in which Marangoni effects are absent the bubble or droplet always moves with constant velocity without changing shape. In the case in which only Marangoni effects are present the bubble or droplet either always moves away from or always moves towards the position of minimum surface tension; in the latter case it ultimately fills the entire cross-section of the tube at a final stationary position which is closer to the position of minimum surface tension than its original position. In the cases in which either only Marangoni effects and gravitational effects or only Marangoni effects and background-flow effects are present the competition between the two effects can lead to a nonmonotonic evolution of the position of the centre of mass of the bubble or droplet. The behaviour of a self-rewetting system described in the present work is qualitatively different from that for ordinary fluids, in which case the bubble or droplet always moves with constant velocity without changing shape.

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“…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. Furthermore, Zhou et al found that the jet phenomenon generated in the butanol aqueous solution would lead to the circulating flow between hot and cold fluids.…”

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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Heat transfer enhancement of subcooled pool boiling with self-rewetting fluid

Cited by 37 publications

References 15 publications

On the mechanism of boiling heat transfer enhancement by surfactant addition

On the mechanism of boiling heat transfer enhancement by surfactant addition

Unsteady motion of a long bubble or droplet in a self-rewetting system

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

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Heat transfer enhancement of subcooled pool boiling with self-rewetting fluid

Cited by 37 publications

References 15 publications

On the mechanism of boiling heat transfer enhancement by surfactant addition

On the mechanism of boiling heat transfer enhancement by surfactant addition

Unsteady motion of a long bubble or droplet in a self-rewetting system

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

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