Wicking of liquid nitrogen into superheated porous structures

Grebenyuk, Yulia; Dreyer, Michael

doi:10.1016/j.cryogenics.2016.05.008

Cited by 21 publications

(5 citation statements)

References 34 publications

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“…The linear wicking behaviour does not match the classic Lucas-Washburn curve. A linear wicking curve could be observed in Grebenyuk and Dreyer [34]. They investigated the wicking behaviour of liquid nitrogen with a superheated porous structure.…”

Section: Discussionmentioning

confidence: 99%

“…Furthermore, the buoyancy force and the Wilhelmy effect have to be considered. In order to account for these effects, a correction of the weight measurement was used, which has already been used by Grebenyuk et al [30,34]. For this purpose, the weight of the completely saturated sample, but a partially submerged sample is subtracted from the weight of the completely saturated sample.…”

Section: Characterizationmentioning

confidence: 99%

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Solution based freeze cast polymer derived ceramics for isothermal wicking - relationship between pore structure and imbibition

Schumacher

Zimnik

Wilhelm

et al. 2019

Science and Technology of Advanced Materials

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Besides conventional applications for porous monoliths such as filtration, open porosity enables capillary transport. For this application, porous polymer-derived ceramic monoliths (SiOC) with different pore morphology and porosity were obtained by solution-based freeze casting. Methylpolysiloxane and (3-aminopropyl)triethoxysilane were used as a precursor and crosslinking agent, respectively. Tert-butyl alcohol and cyclohexane acted as solvents and created prismatic and dendritic pore morphology. Additionally, differences in solid loading and the addition of preceramic filler particles changed the open porosity from 62% to 79%, the mean pore window diameter from 11 µm to 21 µm and the isotropy. The lateral surface of the monoliths is mainly closed due to the use of a Si-coated film as an intermediate layer which prevents nucleation. Within the parameters characterizing the pore structure, open porosity and pore window diameter were found to be most influencing on wicking tested by the Washburn-Sorption method. The permeability was obtained by constant head experiments and from the viscous-dominated part of the wicking curve. Furthermore, predictions of wicking using the Lucas-Washburn equation with gravity effect which bases on the assumption of capillary bundles were conducted. Wicking experiments showed that describing a real porous structure by macroscopic parameters may not be sufficient for structures deviating strongly from the assumption of capillary bundles. The combination of prediction with the knowledge of main influencing factors allows for tailoring the pore structure of SiOC monoliths prepared by solution-based freeze casting for capillary transport applications.

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Section: Discussionmentioning

confidence: 99%

Section: Characterizationmentioning

confidence: 99%

Solution based freeze cast polymer derived ceramics for isothermal wicking - relationship between pore structure and imbibition

Schumacher

Zimnik

Wilhelm

et al. 2019

Science and Technology of Advanced Materials

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show abstract

“…Traditionally, wicks have been used in the burning of candles or lamps. However, they have also been used in many industrial, medical, and engineering applications 1–12 . In several of these applications, the performance of wicks has been evaluated according to different aspects related to their specific applications 13 .…”

Section: Introductionmentioning

confidence: 99%

Investigating liquid fronts during spontaneous imbibition of liquids in industrial wicks. Part I: Experimental studies

Zarandi

Pillai

2021

AIChE Journal

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A large set of industrial wicks made from sintered polymer beads and fibrous materials were studied. Three types of liquid fronts were observed: sharp, semi‐sharp, and diffuse. The bead‐like microstructure with lower porosity is found to support sharp fronts, while the aligned‐fiber microstructure with higher porosities leads to a smudging/diffusing of the fronts. The previously developed sharp‐front model is found to predict the front height as a function of time quite well in the sintered‐bead wicks and the two “semi‐sharp” fibrous wicks. The liquid‐front height calculated from the liquid mass‐gain data was validated through visual observations for all but the two fibrous wicks generating the diffuse fronts. These latter cases, observed to start off as a sharp fronts, faded with time.

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“…There are six influential factors to be considered for cryogenic screen channel LADs: bubble point pressure, flow-through-screen pressure drop, wicking rate, screen compliance, material compatibility, and pressurant gas type (Hartwig 2016). Many studies have been completed on bubble point pressure (Alexander 1970) (Burge 1973) (Camarotti et al 2019a) (Conrath 2012) (Hartwig and McQuillen 2015) ) (Hartwig et al 2015a) (Savas et al 2014) (Hartwig 2015) (Hartwig and Darr 2014) (Hartwig et al 2015b) (Hartwig and Kamotani 2016), flow-through-screen pressure drop (Burge 1973) (Armour 1968) (Camarotti et al 2019a) (Cady 1977) (Cady 1973) (Darr et al 2017) and wicking rate (Hartwig 2016) (Bingham and Tegart 1977) (Camarotti et al 2019a) (Fries et al 2007) (Symons 1974) (Hastings et al 2011) (Grebenyuk 2016) (Gerstmann and Fischer 2013). Only a minimal amount of studies have been completed for the topic of screen compliance (Camarotti et al 2019b) (Jaekle 1997) (Paynter 1973), with no publicly available data on the effects of aspect ratio on screen compliance.…”

Section: Introductionmentioning

confidence: 99%

Liquid Acquisition Device Screen Compliance Experiments with Rectangular Geometry for Microgravity Applications

Vasireddy

Camarotti

Hartwig

et al. 2021

Microgravity Sci. Technol.

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Screen channel liquid acquisition devices (LADs) are used in space as part of larger cryogenic propellant management devices (PMDs) to separate liquid and vapor phases in microgravity environments. A gallery type LAD utilizes surface tension forces in a porous screen to separate the vapor phase from the liquid phase during tank outflow. The phase separation can take place until the pressure difference across the screen overcomes a certain pressure, namely the bubble point pressure. Screen compliance is one of the influential factors to be considered while designing LADs. Screen compliance is a measure of how well the screen complies (i.e. deflects) when the liquid inside the LAD channel accelerates from rest to a steady state. In this study, the pressure difference across the screen and the effective screen deflection thickness are experimentally measured to calculate the linear screen compliance coefficient, K SC . Measurements are carried out for 14 rectangular geometry screens with 2″ × 1″, 2″ × 2″, and 4″ × 1″ aspect ratios to study the dependency of aspect ratio on the screen compliance.

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Wicking of liquid nitrogen into superheated porous structures

Cited by 21 publications

References 34 publications

Solution based freeze cast polymer derived ceramics for isothermal wicking - relationship between pore structure and imbibition

Solution based freeze cast polymer derived ceramics for isothermal wicking - relationship between pore structure and imbibition

Investigating liquid fronts during spontaneous imbibition of liquids in industrial wicks. Part I: Experimental studies

Liquid Acquisition Device Screen Compliance Experiments with Rectangular Geometry for Microgravity Applications

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