Pool boiling heat transfer enhancement using vertically aligned carbon nanotube coatings on a copper substrate

Dharmendra, M.; Suresh, S.; Kumar, C.S. Sujith; Yang, Q.

doi:10.1016/j.applthermaleng.2015.12.081

Cited by 116 publications

(27 citation statements)

References 12 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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“…T 1 is the measured temperature by the thermocouple which has been embedded at 3 mm distance from the top of the surface of the copper test specimen. Equation (4) is used to calculate the coefficient of heat transfer for convective boundary layer with respect to heat flux and temperature difference between surface and fluid [15].…”

Section: Discussionmentioning

confidence: 99%

Investigation to Improve the Pool Boiling Heat Transfer Characteristics Using Laser-Textured Copper-Grooved Surfaces

Mani

Suresh

Ali

et al. 2020

International Journal of Photoenergy

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Improving the performance of pool boiling with critical heat flux of pool boiling and enhancing the coefficient of heat transfer through surface modification technique have gained a lot of attention. These surface modifications can be done at different scales using various techniques. However, along with the performance improvement, the durability and stability of the surface modification are very crucial. Laser machining is an attractive option in this aspect and is gaining a lot of attention. In the present experimentation research work, pool boiling attributed performance of copper-grooved surfaces obtained through picosecond laser machining method is investigated. The performance of the modified surfaces was compared with the plain surface serving as reference. In this, three square grooved patterns with the same pitch (100 μm) and width (100 μm) but different depths (30, 70, and 100 μm) were investigated. Different depths were obtained by varying the scanning speed of the laser machine. In addition to the microchannel effect, the grain structuring during the laser machining process creates additional nucleation sites which has proven its effectiveness in improving the pool boiling performance. In all aspects, the pool boiling performance of the grooved laser-textured surface has showed increased surface characterisation as compared with the surface of copper.

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“…This was accomplished by modifying the CNT growth recipe to provide strong adhesion to the substrate (see the Methods section) and by coating the CNTs with Al 2 O 3 above a certain thickness. 18 Here, two CNT micropillar arrays with the same microstructure geometry are coated with ∼2 nm (20 ALD cycles) and ∼15 nm (150 ALD cycles) Al 2 O 3 coating ( Figure S4). The sample with ∼2 nm Al 2 O 3 coating reached a CHF of 150 W cm −2 .…”

Section: Acs Applied Nano Materialsmentioning

confidence: 99%

Microstructured Ceramic-Coated Carbon Nanotube Surfaces for High Heat Flux Pool Boiling

Zhao

Dash

Dhillon

et al. 2019

ACS Appl. Nano Mater.

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Stable surfaces with high boiling heat flux are critical to many thermal and energy conversion systems, and it is well-known that the microscale texture and wettability of a surface influences its critical heat flux (CHF). We investigate pool boiling on microstructured ceramic-coated carbon nanotube (CNT) surfaces. CNT microstructures are patterned with precise dimensions over large areas, and a ceramic coating by atomic layer deposition (ALD) imparts stability in the presence of capillary forces and thermal stresses that occur during boiling, achieving a measured CHF as high as 245 W cm −2. We also show that the nanoporosity of the ceramic−CNT microstructures has a negligible influence on the CHF because surface rewetting is dominated by microscale imbibition. The high CHF values achieved on our surfaces are attributed to the micropatterning and the nanoscale surface texture of the CNTs, which accelerate liquid imbibition upon bubble departure. Our findings also suggest further enhancements in CHF can be made by optimizing the microstructure pattern and improving its wettability. Therefore, micropatterned ceramic−CNT composites are a potentially attractive substrate for industrial applications of pool boiling.

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Pool boiling heat transfer enhancement using vertically aligned carbon nanotube coatings on a copper substrate

Cited by 116 publications

References 12 publications

Experimental study on pool boiling in a porous artery structure

Experimental study on pool boiling in a porous artery structure

Investigation to Improve the Pool Boiling Heat Transfer Characteristics Using Laser-Textured Copper-Grooved Surfaces

Microstructured Ceramic-Coated Carbon Nanotube Surfaces for High Heat Flux Pool Boiling

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