Effect of Surface Roughness on Pool Boiling Heat Transfer of Water on a Superhydrophilic Aluminum Surface

Kim, Jinsub; Jun, Seongchul; Lee, Jung-Ho; Godinez, Juan C.; You, Seungkwon

doi:10.1115/1.4036599

Cited by 80 publications

(15 citation statements)

References 27 publications

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“…The CHF value for either micro-patterned surface exhibits a 20% improvement over that of a plain copper surface. This increase is due to the reduced contact angle [11,36] which allows the surface to be easily and continuously wetted and delays dry-out of the surface.…”

Section: Resultsmentioning

confidence: 99%

“…Researchers have studied how CHF and HTC can be increased by fabricating porous coatings on a plain surface [1,3,4,5,6,7,8,9,10], nano-structures on a plain surface [11,12], laser-processed structures [4,13], rough surfaces [14,15], enhanced designed surfaces [16], micro-patterned structures [6,15,17,18,19,20], or combined structures with micro-patterned structures and porous coating [6,21,22]. Their results indicate significant improvements in both the CHF and HTC.…”

Section: Introductionmentioning

confidence: 99%

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Fabrication of Micro-Patterned Surface for Pool-boiling Enhancement by Using Powder Injection Molding Process

et al. 2019

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In this study, two kinds of copper micro-patterned surfaces with different heights were fabricated by using a powder injection molding (PIM) process. The micro-pattern’s size was 100 μm, and the gap size was 50 μm. The short micro-pattern’s height was 100 μm, and the height of the tall one was 380 μm. A copper powder and wax-polymer-based binder system was used to fabricate the micro-patterned surfaces. The critical heat flux (CHF) and heat transfer coefficient (HTC) during pool-boiling tests were measured with the micro-patterned surfaces and a reference plain copper surface. The CHF of short and tall micro-patterned surfaces were 1434 and 1444 kW/m2, respectively, and the plain copper surface’s CHF was 1191 kW/m2. The HTC of the plain copper surface and the PIM surface with short and tall micro-patterned surfaces were similar in value up to a heat flux 1000 kW/m2. Beyond that value, the plain surface quickly reached its CHF, while the HTC of the short micro-patterned surface achieved higher values than that of the tall micro-patterned surface. At CHF, the maximum values of HTC for the short micro-pattern, tall micro-pattern, and the plain copper surface were 68, 58, and 57 kW/m2 K.

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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Fabrication of Micro-Patterned Surface for Pool-boiling Enhancement by Using Powder Injection Molding Process

et al. 2019

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“…At low levels of heat flux, pores of the largest size play significant roles in heat transfer. The influence of surface roughness on nucleate boiling heat transfer was investigated by [12][13][14][15][16]. The major conclusion from these studies indicates that increases in the surface roughness enhance the number of active nucleation sites, hence increase the heat transfer coefficient (HTC).…”

Section: Introductionmentioning

confidence: 99%

Nucleate Pool Boiling Heat Transfer from High-Flux Tube with Dielectric Fluid HFE-7200

2020

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In the present experimental study, nucleate pool boiling heat transfer measurements of two high-flux tubes (sample A and sample B) were conducted at atmospheric pressure with HFE-7200 as the working fluid. Both high-flux tubes were made from a sintered Cu-Ni (high-flux) alloy powder. The porous high-flux surface was coated inside the test tube and it is tested within the heat flux ranging from 2.6 to 86 kW/m2. The major difference between sample A and sample B was the coating thickness, where sample B (0.6 mm) was much larger than that of sample A (0.07 mm). Both tubes showed about three times enhancement in heat transfer coefficient (HTC) when compared to plain tube. Even though sample B contained a higher HTC than sample A, it also revealed a faster level-off phenomenon regarding the HTC vs. wall superheat. The major parameter which characterizes the boiling performance of high-flux tube was the ratio of coating thickness to pore diameter which also yielded different trends upon HTC vs. wall superheat amid sample A and B. It was found that the porous based Nishikawa correlation can well predict the performance of sample A but not sample B. This is because the ratio of coating thickness to pore diameter is far outside the applicable range of the Nishikawa correlation. Hence, a modified Nishikawa correlation is proposed. The predicted capability of the proposed modified Nishikawa correlation against sample A and sample for HTC was within ±28% deviation. The standard mean deviation of the Nishikawa correlation with experimental data for sample A and sample B was 0.302 (12.48%) and 5.64 (73%), respectively.

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“…Aluminum possesses many attractive mechanical and physical properties, such as high strength-to-weight ratio, heat conductivity, electrical conductivity, and reflectivity; thus, aluminum alloys have been used for various industrial applications. Recently, wettability control on aluminum surfaces has been an important strategy for corrosion protection, heat exchange devices, and anti-icing surfaces [1,2,3,4,5,6,7,8,9,10,11,12,13]. For example, a superhydrophilic aluminum surface with a water contact angle ( θ WCA ) measuring less than 10° exhibits rapid spreading of a water droplet, and such aluminum substrates have potential as high-efficiency plate-fin heat exchangers and antifouling materials [14,15].…”

Section: Introductionmentioning

confidence: 99%

A Superhydrophilic Aluminum Surface with Fast Water Evaporation Based on Anodic Alumina Bundle Structures via Anodizing in Pyrophosphoric Acid

et al. 2019

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A superhydrophilic aluminum surface with fast water evaporation based on nanostructured aluminum oxide was fabricated via anodizing in pyrophosphoric acid. Anodizing aluminum in pyrophosphoric acid caused the successive formation of a barrier oxide film, a porous oxide film, pyramidal bundle structures with alumina nanofibers, and completely bent nanofibers. During the water contact angle measurements at 1 s after the water droplet was placed on the anodized surface, the contact angle rapidly decreased to less than 10°, and superhydrophilic behavior with the lowest contact angle measuring 2.0° was exhibited on the surface covered with the pyramidal bundle structures. As the measurement time of the contact angle decreased to 200–33 ms after the water placement, although the contact angle slightly increased in the initial stage due to the formation of porous alumina, at 33 ms after the water placement, the contact angle was 9.8°, indicating that superhydrophilicity with fast water evaporation was successfully obtained on the surface covered with the pyramidal bundle structures. We found that the shape of the pyramidal bundle structures was maintained in water without separation by in situ high-speed atomic force microscopy measurements.

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Effect of Surface Roughness on Pool Boiling Heat Transfer of Water on a Superhydrophilic Aluminum Surface

Cited by 80 publications

References 27 publications

Fabrication of Micro-Patterned Surface for Pool-boiling Enhancement by Using Powder Injection Molding Process

Fabrication of Micro-Patterned Surface for Pool-boiling Enhancement by Using Powder Injection Molding Process

Nucleate Pool Boiling Heat Transfer from High-Flux Tube with Dielectric Fluid HFE-7200

A Superhydrophilic Aluminum Surface with Fast Water Evaporation Based on Anodic Alumina Bundle Structures via Anodizing in Pyrophosphoric Acid

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