Development of heat and mass transfer model for condensation

Shen, Qian; Sun, Daming; Su, Shiyue; Zhang, Ning; Jin, Tao

doi:10.1016/j.icheatmasstransfer.2017.03.009

Cited by 36 publications

(7 citation statements)

References 20 publications

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“…Indeed, many publications reported the characteristics of various electrode arrangements including point-to-plane 3 , point-to-grid 4 , point-to-ring 5 , wire-to-plate 6 , wire-to-incline wing 7 , where ion wind is generated from a thin wire/needle with high curvature, yielding high velocity of ion wind near the surface of the collector electrode. Many other developments of this method using needle-toparallel plates 8 , point-to-wire 9 , rod-to-plate 10 , point-to-parallel plate 8 , wire-to-cylinder 11 , wire-to-wire 12 , or point-to-cylinder 13 have been recently suggested. Furthermore, several geometrical improvements of electrodes have also been reported to optimise ion flows by using alternating negative/positive 14 , multi electrodes 15 .…”

mentioning

confidence: 99%

Corona based air-flow using parallel discharge electrodes

Dau

Dinh

Thanh

et al. 2016

Experimental Thermal and Fluid Science

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A novel air-flow generator based on the effect of ion wind has been developed by the simultaneous generation of both positive and negative ions using two electrodes of opposite polarity placed in parallel. Unlike the conventional unipolar-generators, this bipolar configuration creates an ion wind, which moves away from both electrodes and yields a very low net charge on the device. The electro-hydrodynamic behaviour of air-flow has been experimentally and numerically studied. The velocity of ion wind reaches values up to 1.25 m/s using low discharge current 5 μA with the kinetic conversion efficiency of 0.65% and the released net charge of -30 fA, 8 orders of magnitude smaller compared with the discharge current. Due to easy scalability and low net charge, the present configuration is beneficial to applications with space constraints and/or where neutralized discharge process is required, such as inertial fluidic units, circulatory flow heat transfer, electrospun polymer nanofiber to overcome the intrinsically instability of the process, or the formation of low charged aerosol.

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mentioning

confidence: 99%

Corona based air-flow using parallel discharge electrodes

Dau

Dinh

Thanh

et al. 2016

Experimental Thermal and Fluid Science

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“…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%

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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“…The property parameters in the unsteady term, convective term, and diffusion term are

ρ c

ρ c

, and k , respectively. They could be weighted by algebraic scheme 17‐20 or harmonic scheme 19,20

A = α A_{1} + (1 - α) A_{2},

\frac{1}{A} = \frac{α}{A_{1}} + \frac{(1 - α)}{A_{2}},

where A represents

ρ c

or k in Equation (11). The subscripts 1, 2 represent phase 1 and phase 2, respectively.…”

Section: Mathematical Modelmentioning

confidence: 99%

“…In VOF, there are mainly two kinds of weighting forms of property parameters, that is, the algebraic scheme and harmonic scheme. Those schemes have been common in VOF literature: Agarwal et al 17 and Shen et al 18 have used the algebraic scheme for all the property parameters in VOF to perform their research, Khodadadi et al 19 and Ma et al 20 have used harmonic scheme for specific heat and algebraic scheme for other property parameters in VOF to conduct the investigations. However, complete research on the weighting forms for all the property parameters is still not done.…”

Section: Introductionmentioning

confidence: 99%

Numerical method for interfacial heat transfer in an oil‐water displacement flow

et al. 2020

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A numerical study of interfacial heat transfer is performed in an oil‐water displacement flow. The process of oil‐water displacement is one of the key technologies for the underwater tank in offshore oil exploitation. There is a need to investigate the interfacial heat transfer between oil and water as the wax precipitation and solidification of high pour point crude oil at low temperature will particularly affect the flow of oil. Before the numerical simulation is performed, it is necessary to find out the optimal numerical method. For the volume of fluid method, the property parameters in the temperature equation are mixture ones weighted by each fluid. When the unsteady term, convective term, and diffusion term are considered, there are three property parameters that are the coefficient of each term. For each coefficient, whether an algebraic scheme or a harmonic scheme could be used. When the three coefficients are considered together, there would be eight combinations of weighting form. A numerical method is developed by exploring an optimal combination of the weighting form. The results are demonstrated with an analytical solution. It is found that the combination of three harmonic schemes will significantly improve the error. The maximum and total error from this combination are reduced by 62% and 79% compared to the second‐best one and by 86% and 93% compared to the worst one. Meanwhile, the clock time only increases by 1.6% and 0.4%. The combinations of three harmonic schemes will result in the largest order of accuracy which is as large as 1.60. The harmonic scheme should be used for the property parameter of all the three terms in the vertical oil‐water flow.

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Development of heat and mass transfer model for condensation

Cited by 36 publications

References 20 publications

Corona based air-flow using parallel discharge electrodes

Corona based air-flow using parallel discharge electrodes

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

Numerical method for interfacial heat transfer in an oil‐water displacement flow

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