Effects of operational parameters on liquid nitrogen spray cooling

Ruan, Yixiao; Hou, Yu; Xue, Renyu; Luo, Gaoqiao; Zhu, Kuizhang; Liu, Xiufang; Chen, Liang

doi:10.1016/j.applthermaleng.2018.09.098

Cited by 26 publications

(8 citation statements)

References 30 publications

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“…The drops from the inlet temperature to the outlet temperature increased with the LN 2 mass flow rates, while they showed a decreasing trend with increasing velocities. The droplet distributions were recorded and can be seen in Table 1 in [21]. The near-field spray angles fluctuated around 60 • during the experimental studies, which were measured from the images recorded by the high-speed camera.…”

Section: Cooling Performancementioning

confidence: 99%

Numerical Study of the Effects of Injection Fluctuations on Liquid Nitrogen Spray Cooling

et al. 2019

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Spray cooling with liquid nitrogen is increasingly utilized as an efficient approach to achieve cryogenic cooling. Effects of injection mass flow rate fluctuations on the evaporation, temperature distribution, and droplet distribution of a spray field were examined by employing a validated Computational Fluid Dynamics (CFD) numerical model. The numerical results indicated that injection fluctuations enhanced the volume-averaging turbulent kinetic energy and promoted the evaporation of the whole spray field. The strengthened mass and heat transfer between the liquid nitrogen droplets and the surrounding vapor created by the fluctuating injection led to a lower temperature of the whole volume. A relatively smaller droplet size and a more inhomogeneous droplet distribution were obtained under the unsteady inlet. The changes of the frequency and the amplitude of the fluctuations had little effects on the overall spray development. The results could enrich the knowledge of the relation between the inevitable fluctuations and the overall spray development and the cooling performance in a practical spray cooling system with cryogenic fluids.

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Section: Cooling Performancementioning

confidence: 99%

Numerical Study of the Effects of Injection Fluctuations on Liquid Nitrogen Spray Cooling

et al. 2019

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“…The dynamic of liquid droplets impacting solid surfaces is a very popular research field thanks to a broad range of engineering applications, such as inkjet printing (Cao et al, 2020;Wijshoff, 2018;, petroleum industries (Luo, Gong, He, Zhang, & He, 2021;Raya, Saaid, Ahmed, & Umar, 2020;Verma, Alrefaee, Quraishi, Ebenso, & Hussain, 2021), and spray cooling (Benther, Pelaez-Restrepo, Stanley, & Rosengarten, 2021;H. Liu, Cai, Yan, Jia, & Yin, 2018;Ruan et al, 2019). Understanding the underlying mechanisms is instructive for these engineering applications.…”

Section: Introductionmentioning

confidence: 99%

Simulation of droplet impact dynamics on V-shaped walls

Chen

2023

Preprint

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This paper presents the morphological evolution characteristics of a droplet impacting a V-shaped wall by using the lattice Boltzmann method (LBM). Four parameters are investigated comprehensively. The parameters vary over wide ranges: surface wettability (60o ≤ θeq ≤ 120o), Weber number (102.27 ≤ We ≤ 3681.82), bending angle of the V-shaped wall (90o ≤ θ ≤ 180o), and eccentricity ratio (0 ≤ b ≤ 0.5). Two types of collision are observed: deposition and breakage. For breakage, the number of satellite droplets increases against the increment of We. The splashing occurs for a high We. And the lamella ejection is observed on the hydrophilic wall and the neutral wall. The lamella ejection will be slight against the increase of θeq, while it will become obvious against the increment of θ. In addition, the nondimensional spreading length, width, and height are measured and analyzed. A regime map is established based on We and θ.

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“…Evaporation of sessile droplets laden with nanoparticles is relevant in a wide range of practical applications, such as inkjet printing, 1-4 fabrication of DNA microarrays, 5,6 estimating the lifetime of saliva droplets, 7 coating technology, 8,9 spray and hotspot cooling, [10][11][12] microfluidics, 13 to name a few. Additionally, this subject attracted the attention of researchers due to the profound scientific curiosity to understand the underlying mechanism of the resulting deposition patterns, including the commonly observed "coffee-stain" or "coffee-ring" effect.…”

Section: Introductionmentioning

confidence: 99%

“…Evaporation of sessile droplets laden with nanoparticles is relevant in a wide range of practical applications, such as inkjet printing, − fabrication of DNA microarrays, , estimating the lifetime of saliva droplets, coating technology, , spray and hotspot cooling, − microfluidics, to name a few. Additionally, this subject attracted the attention of researchers due to the profound scientific curiosity to understand the underlying mechanism of the resulting deposition patterns, including the commonly observed “coffee-stain” or “coffee-ring” effect. − It is a prevalent belief that increasing the thermal conductivity of a liquid increases the heat transfer rate. − Thus, the addition of nanoparticles in working liquids to enhance their thermal conductivity is a common strategy that has been employed for a long time in various applications. − …”

Section: Introductionmentioning

confidence: 99%

Counter-Intuitive Evaporation in Nanofluids Droplets due to Stick-Slip Nature

et al. 2022

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We experimentally investigate the evaporation characteristics of a sessile ethanol droplet containing Al 2 O 3 and Cu nanoparticles of sizes 25 nm and 75 nm on a heated substrate using shadowgraphy and infrared imaging techniques. Our results demonstrate that the droplet contact line dynamics resulting from the presence of various nanoparticles plays a dominant role in the evaporation process. This is in contrast to the widely-held assumption that the enhanced evaporation rate observed in sessile nanofluid droplets is due to the higher thermal conductivity of the added nanoparticles. We observe that even though the thermal conductivity of Al 2 O 3 is an order of magnitude lower than that of Cu, droplets containing 25 nm-sized Al 2 O 3 exhibit pinned contact line dynamics and evaporate much more rapidly than droplets containing Cu nanoparticles of both sizes and 75 nm Al 2 O 3 nanoparticles that exhibit stick-slip behaviour. We also found that the droplets with different nanoparticles display distinct thermal patterns due to the difference in contact line behaviour, which alters the

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Effects of operational parameters on liquid nitrogen spray cooling

Cited by 26 publications

References 30 publications

Numerical Study of the Effects of Injection Fluctuations on Liquid Nitrogen Spray Cooling

Numerical Study of the Effects of Injection Fluctuations on Liquid Nitrogen Spray Cooling

Simulation of droplet impact dynamics on V-shaped walls

Counter-Intuitive Evaporation in Nanofluids Droplets due to Stick-Slip Nature

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