Drop impact cooling enhancement on nano-textured surfaces. Part II: Results of the parabolic flight experiments [zero gravity (0g) and supergravity (1.8g)]

Sinha-Ray, Suman; Yarin, Alexander L.; Weickgenannt, Christina M.; Emmert, Johannes; Tropea, Cameron

doi:10.1016/j.ijheatmasstransfer.2013.11.008

Cited by 36 publications

(12 citation statements)

References 9 publications

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“…In particular, nanowires have been fabricated at the walls of micro-channels using a two-step electroless etching process, which resulted in stabilization of flow and boiling process and increase of removed heat flux in certain cases by about 40% [6]. Nano-texturing have been also rendered by electrospun nanofibers to enhance heat removal rate from high-power microelectronics by drop/spray cooling and in pool boiling and to prevent Leidenfrost effect when coolant droplets impact onto high-temperature surfaces [8][9][10][11][12][13][14][15][16]. These results show that heat removal at such nano-textured surfaces can be as high as 1 kW/cm 2 .…”

Section: Introductionmentioning

confidence: 99%

Trains of Taylor bubbles over hot nano-textured mini-channel surface

Freystein

Kolberg

Spiegel

et al. 2016

International Journal of Heat and Mass Transfer

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Section: Introductionmentioning

confidence: 99%

Trains of Taylor bubbles over hot nano-textured mini-channel surface

Freystein

Kolberg

Spiegel

et al. 2016

International Journal of Heat and Mass Transfer

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“…Droplet evaporation, a basic natural phenomenon encountered in daily life, has numerous crucial applications, such as in DNA extraction, 1 medical testing, 2-4 droplet cooling, [5][6][7] inkjet printing, 8,9 and painting. 10,11 The evaporation characteristics of droplets are influenced by the properties, such as roughness, 12,13 thermal conductivity, 14,15 and wettability, 16,17 of the surface on which they are dropped.…”

mentioning

confidence: 99%

Influence of surface temperature and wettability on droplet evaporation

Hsu

et al. 2015

Applied Physics Letters

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The evaporation characteristics of sessile water droplets on various wettability substrates (hydrophilic, hydrophobic, and mixed wettability surfaces) were experimentally investigated in this study. Placing droplets on a regulated superheated surface led to rapid vapor bubble formation. The droplet parameters, such as the contact angle and volume evolution over evaporation time, were experimentally measured. The results revealed that surface wettability plays a critical role not only in vapor bubble dynamics but also in evaporation. V C 2015 AIP Publishing LLC.

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“…The passive techniques rely mostly on modifying the surface conditions of the heated plate by either fabricating a thin layer of microstructures [9][10][11][12] or depositing a thin layer of nanobers. [13][14][15][16][17][18] Passive techniques, on the other hand, do not require an external force to elevate the Leidenfrost point. For instance, Kim et al 19 conducted a detailed experimental study to investigate the parameters-roughness height, wettability, and porosity-that gives rise to a higher Leidenfrost point with the presence of microstructures on the heated plate.…”

Section: Introductionmentioning

confidence: 99%

Suppression of the Leidenfrost effect via low frequency vibrations

Hung

Tan

2015

Soft Matter

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The ability to suppress the Leidenfrost effect is of significant importance in applications that require rapid and efficient cooling of surfaces with temperature higher than the Leidenfrost point TSL. The Leidenfrost effect will result in substantial reduction in cooling efficiency and hence there have been a few different approaches to suppress the Leidenfrost effect. The majority of these approaches relies on fabricating micro/nano-structures on heated surfaces, others rely on inducing an electric field between the droplets and the heated surfaces. In this paper, we present an approach that induces low frequency vibrations (f∼10(2) Hz) on a heated surface to suppress the effect. By mapping the different magnitudes of surface acceleration [greek xi with two dots above]sversus different initial surface temperatures Ts of the substrate, three regimes that represent three distinct impact dynamics are analyzed. Regime-I represents gentle film boiling ([greek xi with two dots above]s∼10(2) m s(-2) and Ts∼TSL), which is associated with the formation of thin spreading lamella around the periphery of the impinged droplet; Regime-II ([greek xi with two dots above]s∼10(2) m s(-2) and Ts>TSL) represents film boiling, which is associated with the rebound of the impinged droplet due to the presence of a thick vapor layer; Regime-III ([greek xi with two dots above]s∼10(3) m s(-2) and Ts∼TSL) represents contact boiling, which is associated with the ejection of tiny droplets due to the direct contact between the droplet and the heated surface. The estimated cooling enhancement for Regime-I is between 10% and 95%, Regime-II is between 5% and 15%, and Regime-III is between 95% and 105%. The improvement in cooling enhancement between Regime-I (strong Leidenfrost effect) and Regime-III (suppressed Leidenfrost effect) is more than 80%, demonstrating the effectiveness of using low frequency vibrations to suppress the Leidenfrost effect.

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Drop impact cooling enhancement on nano-textured surfaces. Part II: Results of the parabolic flight experiments [zero gravity (0g) and supergravity (1.8g)]

Cited by 36 publications

References 9 publications

Trains of Taylor bubbles over hot nano-textured mini-channel surface

Trains of Taylor bubbles over hot nano-textured mini-channel surface

Influence of surface temperature and wettability on droplet evaporation

Suppression of the Leidenfrost effect via low frequency vibrations

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