Experimental study of saturated pool boiling from downward facing surfaces with artificial cavities

Zhong, Dawen; Jiang, Meng; Li, Zhixin; Zhang, Guo

doi:10.1016/j.expthermflusci.2015.06.003

Cited by 22 publications

(5 citation statements)

References 24 publications

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“…Based on the hydrodynamic instability model, recent studies regarding the effects of the heating surface characteristics made some modifications considering the surface wettability [10][11][12][13][14][15], contact angle [16][17][18], and capillary wicking [1λ-20]. In order to study these parameters, some optimization measures were presented, such as using surface coating [21][22][23][24][25][26][27][28] to change the surface wettability and contact angle, adopting porous structures [2λ-33] to enhance the capillary force and utilizing nano/micro grooved surfaces [34][35][36][37][38][39][40][41][42][43][44][45] to change the morphology of the heated surface.…”

Section: Introductionmentioning

confidence: 99%

Experimental study on pool boiling in a porous artery structure

Zhang

Bai

Lin

et al. 2019

Applied Thermal Engineering

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In this work, a porous artery structure is proposed to enhance the critical heat flux (CHF) of pool boiling based on the concept of "phase separation and modulation", and extensive experimental studies have been carried out for validation. In the experiment, multiple rectangular arteries were machined directly into the top surface of a copper rod to provide individual flow paths for vapor escaping. The arteries were covered by a microporous copper plate where capillary forces can be developed at the liquid/vapor interface to prevent the vapor from penetrating the porous structure and realize strong liquid suction simultaneously. The pool wall was made of transparent quartz glass to enable a visualization study where the liquid/vapor distribution and movement can be observed directly. Favorable results have been reached as expected, and a maximum heat flux up to 805 W/cm 2 was achieved with no indication of any dry-out, which successfully validated this new concept. In addition, the effects of the diameter and thickness of the porous copper plate, and the connection method between the porous copper plate and copper fin on the pool boiling heat transfer in the porous artery structure were investigated, and the inherent physical mechanisms were analyzed and discussed.

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Section: Introductionmentioning

confidence: 99%

Experimental study on pool boiling in a porous artery structure

Zhang

Bai

Lin

et al. 2019

Applied Thermal Engineering

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“…The competition between vapor escaping from the surface and liquid replenishment would decide the occurrence of CHF. For the past several decades, many measures have been proposed to intensify the nearsurface effects both theoretically [20][21] and experimentally, including surface coating [18,[22][23][24][25][26][27][28] to modify the surface wettability and contact angle, 2D or 3D porous structure [29][30][31][32][33][34][35][36][37][38][39] to enhance the capillary effect and nano/mirco channel surface [40][41][42][43][44][45][46][47][48] to change the geometrical morphology of the boiling surface.…”

Section: Introductionmentioning

confidence: 99%

A comparative study of pool boiling heat transfer in different porous artery structures

Zhang

Bai

Jin

et al. 2022

Applied Thermal Engineering

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“…The former approach, which uses additives 10 , 11 or nanoparticles 12 , has not been widely applicable as it puts constraints on fluid selection and operating conditions of the boiling system 13 . The latter approach includes either treatments to enhance surface wettability 14 , 15 , or surface morphological alteration with porous coatings 16 , 17 , artificial fins 18 – 20 and nano/microstructures 13 , 21 . Although numerous surface modification methods have been found to increase CHF, in particular those utilising nano/microstructures, the roles of surface structures at different length scales in changing the heat flux and the critical temperature remain elusive.…”

Section: Introductionmentioning

confidence: 99%

Critical heat flux enhancement in pool boiling through increased rewetting on nanopillar array surfaces

Nguyen

Liu

Kayes

et al. 2018

Sci Rep

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Boiling is a key heat transfer process for a variety of power generation and thermal management technologies. We show that nanopillar arrays fabricated on a substrate enhance both the critical heat flux (CHF) and the critical temperature at CHF of the substrate and thus, effectively increase the limit of boiling before the boiling crisis is triggered. We reveal that the enhancement in both the CHF and the critical temperature results from an intensified rewetting process which increases with the height of nanopillars. We develop a predictive model based on experimental measurements of rewetting velocity to predict the enhancement in CHF and critical temperature of the nanopillar substrates. This model is critical for understanding how to control boiling enhancement and designing various nanostructured surfaces into specific applications.

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Experimental study of saturated pool boiling from downward facing surfaces with artificial cavities

Cited by 22 publications

References 24 publications

Experimental study on pool boiling in a porous artery structure

Experimental study on pool boiling in a porous artery structure

A comparative study of pool boiling heat transfer in different porous artery structures

Critical heat flux enhancement in pool boiling through increased rewetting on nanopillar array surfaces

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