Enhanced boiling heat transfer from microporous surfaces: effects of a coating composition and method

Chang, Joonho; You, Seungkwon

doi:10.1016/s0017-9310(97)00057-4

Cited by 135 publications

(39 citation statements)

References 7 publications

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“…Submerged pool boiling from porous surfaces has been extensively characterized for a number of surface geometries, working fluids, and flooded porous wick structures often found in heat pipes [15][16][17][18][19][20][21][22][23][24][25][26][27][28]. The fundamental mechanism of heat transfer during boiling from a porous surface submerged in a liquid pool differs from that from a wick that is passively fed by capillary action.…”

Section: Nucleate Boiling In Porous Wick Structuresmentioning

confidence: 99%

Recent Advances in Vapor Chamber Transport Characterization for High-Heat-Flux Applications

Weibel

Garimella

2013

Advances in Heat Transfer

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Owing to their high reliability, simplicity of manufacture, passive operation, and effective heat transport, flat heat pipes and vapor chambers are used extensively in the thermal management of electronic devices. The need for concurrent size, weight, and performance improvements in high-performance electronics systems, without resort to active liquid-cooling strategies, demands passive heat spreading technologies that can dissipate extremely high heat fluxes from small hot spots. In response to these daunting application-driven trends, a number of recent investigations have focused on the design, characterization, and fabrication of ultra-thin vapor chambers for proximate heat spreading away from these hot spots. The predominant transport mechanisms and operational limits have been found to be different under these conditions relative to conventional low-power heat pipes. Noteworthy advances in the fundamental understanding of evaporation and boiling from porous microstructures fed by capillary action, and improvements in vapor chamber characterization, modeling, design, and fabrication techniques are reviewed. Characterization of evaporation and boiling from idealized and realistic wick structures, observation of vapor formation regimes as a function of operating conditions, assessment of fluid dryout limitations, design of novel multi-scale and nanostructured wicks for enhanced transport, and incorporation of these high heat flux transport phenomena into device-level models are discussed. These recent developments have successfully extended the maximum operating heat flux limits of vapor chambers.2

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Section: Nucleate Boiling In Porous Wick Structuresmentioning

confidence: 99%

Recent Advances in Vapor Chamber Transport Characterization for High-Heat-Flux Applications

Weibel

Garimella

2013

Advances in Heat Transfer

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“…HTFF 174-8 High wettability of the micro and nanostructured plates has negative effect on nucleate boiling heat transfer while they have roughness elements, which have a positive effect [23]. As a result of the interplay between these two effects, the heat transfer coefficients are close to each other for both treated and untreated surfaces.…”

Section: Boiling Curves and Heat Transfer Resultsmentioning

confidence: 99%

Nucleate Boiling Heat Transfer Investigation Using Micro and Nanostructured Plates

Nedaei¹,

Saadi²,

Karabacak³

et al. 2017

World Congress on Mechanical, Chemical, and Material Engineering

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-In this study, heat transfer performance of micro and nanostructured plates embedded into a rectangular microchannel was experimentally investigated for their potential use in cooling applications. A simple and environmentally friendly technique was proposed to provide the micro and nanostructured plates having superhydrophilic property. Aluminium alloy (Al Alloy) 4041 substrates of 1.5 × 1.5 cm were roughened by sandblasting method using medium size aluminum oxide abrasive to provide microfeatures; followed by hot water treatment (HWT) process in which nanograss structures were developed on the microstructured substrates. The micro and nanostructured plates were placed near the exit of an aluminum (Al) microchannel with a length, width, and depth of 14 cm, 1.5 cm, and 500 μm, respectively. Four cartridge heaters connected to a DC power supply were utilized to apply heat to the test section. De-ionized (DI) water was used as the working fluid and passed through the microchannel using a micro gear pump at three mass fluxes of 100, 300, and 500 kg/m 2 s. The test section dimensions and experimental parameters were selected such that fully developed flow conditions were obtained. The results from the microchannel with untreated Al alloy surfaces were considered as the baseline data. Experimental results of the micro and nanostructured plates revealed that there is no significant change in nucleate boiling heat transfer compared to the control sample. The reason is related to wettability and roughness of the micro and nanostructured plates.

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“…Uncertainty in the heat flux measurements were found using the the same method as Chang and You [11] and Kim et al [2] due to the similarities in the test heater and procedure. This uncertainty was estimated to be ± 6% for heat fluxes between 0-50 W/cm².…”

Section: Uncertainty Analysismentioning

confidence: 99%

Evaporative Cooling Performance of a Brazed Microporous Coating on an Aluminum Surface

King

Amaya

You

2012

Volume 7: Fluids and Heat Transfer, Parts A, B, C, and D

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The effect of an aluminum microporous coating on evaporative cooling performance of water was studied. The coating consisted of aluminum powder brazed to a flat aluminum substrate. Coatings of average thicknesses of 175 μm, 270 μm, 900 μm, and of average aluminum particle sizes of 27 μm, 70 μm and 114 μm were tested. A hot water treatment of the coating insured repeatability of thermal performance. Wickability was measured and compared to Washburn’s equation for capillary flow. Evaporative cooling tests were then performed on coated and plain surfaces. The test surfaces were uniformly heated while kept vertically dipped in an isothermal pool of water. All microporous coatings increased evaporative heat transfer relative to that of the plain surface by their ability to wick fluid to the entire heated area. With particle size increase from 27 μm to 70 μm both the wickability and heat transfer were significantly increased, but no further significant gains in either were obtained with increase to 114 μm. The maximum heat transfer coefficient was increased ∼11 times and the temperature limit (dry-out) heat flux increased ∼10 times with the two larger particle sizes (70 μm and 114 μm). The heat transfer coefficient and dry-out heat flux similarly increased with thickness increase.

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Enhanced boiling heat transfer from microporous surfaces: effects of a coating composition and method

Cited by 135 publications

References 7 publications

Recent Advances in Vapor Chamber Transport Characterization for High-Heat-Flux Applications

Recent Advances in Vapor Chamber Transport Characterization for High-Heat-Flux Applications

Nucleate Boiling Heat Transfer Investigation Using Micro and Nanostructured Plates

Evaporative Cooling Performance of a Brazed Microporous Coating on an Aluminum Surface

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