Numerical simulation on nitrogen condensation in high aspect ratio mini-channels

Sun, Daming; Qin, Shaocong; Shen, Qian; Su, Shiyue; Lei, Shenghui

doi:10.1016/j.ijrefrig.2020.04.012

Cited by 4 publications

(2 citation statements)

References 24 publications

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“…The performances of a hybrid cooling system are determined by the efficiency of the liquefier unit, the main part of which is a condenser cooled by a cryocooler to temperatures below the cryogen liquefaction point. One of the most common condenser's designs is based on a set of vertical fins [7,9,10,12,13] that offer a wide surface available to the heat exchange with the vapor.…”

Section: Jinst 18 P05002mentioning

confidence: 99%

“…Therefore, in the computational model, instead of the interfacial surface, on which vapor condensation occurs, there is an interfacial layer as thick as several cells. The practical basis of the VOF method application for the condensation processes simulation and the governing equations used are presented in detail, for example, in [13,22,[26][27][28][29].…”

Section: Selection Of Solvers For the Openfoam Environmentmentioning

confidence: 99%

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Numerical simulation of the nitrogen boil-off recondensation in hybrid cooling devices for HPGe detectors

Malgin

Venčels²

2023

J. Inst.

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This paper describes the results of a complex simulation of nitrogen boil-off recondensation in a hybrid cooling device for High Purity Germanium (HPGe) detectors. The OpenFOAM platform-based software was used. The proposed finite-volume axisymmetric 2D model combines cooling processes occurring in the considered three-phase medium, including a liquefier condenser (solid), nitrogen boil-off (gas) and the resulting condensate (liquid). At the beginning of the simulation condenser and gas temperatures are set above the condensation point while the end time is set such that the system reaches a quasi-steady state. For conical and hemispherical condensers, the energy consumption for the following processes occurring in the operating mode such as: condenser cooling; cooling of adjacent boil-off nitrogen vapors; their condensation; the gravity-driven flowing; condensate film subcooling and subsequent partial re-evaporation from its surface are compared. The visualizations of the temperature field of the finite-volume model and the velocity vectors of nitrogen vapors adjacent to the condenser are presented. The calculated integral mass recondensation rates were confirmed experimentally on a commercial hybrid cooling device, taking into account the actual equivalent characteristics of the liquefier on the Stirling cryocooler used.

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Section: Jinst 18 P05002mentioning

confidence: 99%

Section: Selection Of Solvers For the Openfoam Environmentmentioning

confidence: 99%

Numerical simulation of the nitrogen boil-off recondensation in hybrid cooling devices for HPGe detectors

Malgin

Venčels²

2023

J. Inst.

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Numerical scrutinization of dropwise condensation heat transfer on an inclined surface

2022

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Recently, achieving an ameliorated heat transfer rate in dropwise condensation (DWC) has attracted the attention of many researchers. Several parameters, including chemical and physical properties of the substrate, inclination, and interfacial characteristics influence DWC heat transfer rate. The variation of inclination angle is followed by the change in droplet shape and consequently, the heat transfer rate are changed. In this study, the effect of droplet shape variation on diverse inclined substrates is simulated. Moreover, three‐dimensional mass, momentum, and energy equations considering the desired boundary conditions on the unstructured grid are utilized for the scrutinization of flow behavior and heat transfer for static and sliding droplets. For the sake of validation, the outcomes obtained from the simulation were compared with existent data in the literature and a proper agreement was attained. Regarding the outcomes, it was of concern that the influence of inclination angle on the droplet shape is more distinct at higher droplet volume; while no considerable change was seen on heat flux of small droplets by increasing the inclination angle. Furthermore, a higher heat transfer rate was noted by exceeding the inclination angle beyond a definite angle. Additionally, the increased heat transfer rate was affirmed by increasing the Marangoni number ( italicMa ) $({Ma})$.

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Numerical study of condensation heat transfer performance and liquid film distribution characteristics in small-scale helium liquefiers

Wei,

Zhu,

Chen

et al. 2023

International Journal of Refrigeration

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Numerical simulation on nitrogen condensation in high aspect ratio mini-channels

Cited by 4 publications

References 24 publications

Numerical simulation of the nitrogen boil-off recondensation in hybrid cooling devices for HPGe detectors

Numerical simulation of the nitrogen boil-off recondensation in hybrid cooling devices for HPGe detectors

Numerical scrutinization of dropwise condensation heat transfer on an inclined surface

Numerical study of condensation heat transfer performance and liquid film distribution characteristics in small-scale helium liquefiers

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