Impact dynamics and heat transfer characteristics of liquid nitrogen drops on a sapphire prism

Limbeek, Michiel A. J. van; Nes, Thomas; Vanapalli, Srinivas

doi:10.1016/j.ijheatmasstransfer.2019.118999

Cited by 13 publications

(7 citation statements)

References 42 publications

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“…Therefore, no boiling occurs and the cooling rate is not subjected to the Leidenfrost effect, which is the phenomenon that a vapor layer is formed that prevents heat transfer 18,19 . The aluminum vial covered in paper tape was not immersed in isopentane, because previously published experiments have shown that this vial was not subjected to the Leidenfrost effect in LN 2 20 . After adequate cooling, vials were transported using a LN 2 container and stored at −80°C until further use.…”

Section: Methodsmentioning

confidence: 99%

Advancing wide implementation of precision oncology: A liquid nitrogen‐free snap freezer preserves molecular profiles of biological samples

et al. 2023

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Section: Methodsmentioning

confidence: 99%

Advancing wide implementation of precision oncology: A liquid nitrogen‐free snap freezer preserves molecular profiles of biological samples

et al. 2023

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“…Albeit commercial solutions do exist, until now only little is reported in literature about the generation of droplets from cryogenic liquids. However, specifically for liquid nitrogen used in scientific studies, droplets have so far mostly been generated by letting the liquid drip out of a stationary and insulated reservoir for liquid nitrogen 9 – 12 , which is associated with a significantly reduced versatility of the approach due to its limited flexibility and controllability of the liquid.…”

Section: Introductionmentioning

confidence: 99%

Development of a lab-device for evaporation-free supply of pure liquid nitrogen for droplet- and jet-generation

Schremb

Kalter

Vanapalli

2023

Sci Rep

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Cryogenic liquids such as liquid nitrogen are of relevance for numerous processes in engineering, and the food and pharmaceutical industries. However, as a result of its strong evaporation at ambient conditions, its handling for laboratory purposes and experimentation is so far cumbersome. In the present work an original design approach for a supply device for liquid nitrogen is developed and characterized in detail. With the device pure liquid nitrogen is supplied from a pressurized dewar flask to a hypodermic needle without contamination of the liquid with its own vapor or frost, finally enabling to generate a free liquid jet or single droplets in a way comparable to the handling of non-cryogenic liquids using a syringe and a hypodermic needle. Compared to previous approaches for the generation of liquid nitrogen droplets in scientific studies which mostly rely on a reservoir for liquid nitrogen from which droplets form at a bottom outlet due to gravity, the present design allows generation of droplets and free liquid jets in a significantly better controlled and more flexible way. The device is experimentally characterized for varying operational conditions during generation of a free liquid jet, and its versatility for laboratory research purposes is further briefly demonstrated.

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“…The number of studies about the drop impact with phase change, such as boiling and solidification, have rapidly increased in the past 10 years. In the spray cooling, nucleate boiling plays a crucial role to achieve the critical heat flux, while higher substrate temperatures or lower ambient pressures result in the dynamic Leidenfrost [13][14][15][16][17][18], which should be avoided in the cooling application. Solidification of the impacting metal drop controls the characteristics of mechanical strength, and electrical and heat transfer rates of the products manufactured by metal 3D printing [19][20][21].…”

Section: Introductionmentioning

confidence: 99%

Rim Breakups of Impacting Drops on a Superhydrophobic Surface and a Superheated Surface

Shirota

Kato

Ishio

2022

Fluids

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The rim breakup of an impacting drop is experimentally investigated by comparing the impacts on superheated and superhydrophobic surfaces. The objective of the present study is to experimentally examine whether the Bo=1 criteria holds for the rim breakups of drops impacting on the surfaces. A transparent sapphire plate was heated to achieve the Leidenfrost impact, which enables us to observe with a high-speed camera from below. The characteristics of the rim breakup were evaluated quantitatively using a particle tracking velocimetry method for both the rim and the drops generated. As a result, we clarified that Bo of the rim increases in the spreading phase and marks the highest value of 0.5 on a superheated surface, which is smaller than that on a pillar, where Bo≈1. On a superhydrophobic surface, the highest Bo was 1.2, which is smaller than that on a wettable solid surface, 2.5, but close to the value on a pillar. We also revealed that diameters of generated drops collapse on a master curve when plotted as a function of pinch-off time for both the impacts on superheated and superhydrophobic surfaces.

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Impact dynamics and heat transfer characteristics of liquid nitrogen drops on a sapphire prism

Cited by 13 publications

References 42 publications

Advancing wide implementation of precision oncology: A liquid nitrogen‐free snap freezer preserves molecular profiles of biological samples

Advancing wide implementation of precision oncology: A liquid nitrogen‐free snap freezer preserves molecular profiles of biological samples

Development of a lab-device for evaporation-free supply of pure liquid nitrogen for droplet- and jet-generation

Rim Breakups of Impacting Drops on a Superhydrophobic Surface and a Superheated Surface

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