An experimental analysis of adiabatic capillary tubes

Melo, Cláudio; Ferreira, R. T. S.; Neto, C. B.; Gonçalves, Joaquim M.; Mezavila, M. M.

doi:10.1016/s1359-4311(98)00062-3

Cited by 126 publications

(77 citation statements)

References 2 publications

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“…none data set was favored during AD and SD evaluation. Bold marked results in Table 4 The majority of data taken from the open literature were those of Melo [22]. Therefore Melo's correlation (9) shows the best agreement with the experimental data of R12, R134a, and R600a.…”

Section: Comparison Of Other Mass Flow Rate Correlationsmentioning

confidence: 68%

“…Dimensional analyses of adiabatic capillary flow under choked flow conditions have been presented in detail in the literature [22,23,24,25]. The determination of the dimensionless parameters is therefore not presented in detail in this paper.…”

Section: Mass Flow Correlation Based On the Power Law Functionmentioning

confidence: 99%

“…Melo's [22] correlation was taken in account in our study at first, as it is based on regression of a very large amount of experimental data exceeding 1000 data points. The data were measured inside eight different capillary tubes with refrigerants R12, R134a…”

Section: Comparison Of Other Mass Flow Rate Correlationsmentioning

confidence: 99%

“…Melo et al [22], Kim et al [23], Choi et al [24,25] and Jabaraj et al [26] tested a set of capillary tubes with different inner diameters and lengths under varying inlet and outlet conditions. The significant amount of collected data enabled the authors to develop analytical correlations for the mass flow rate.…”

Section: Introductionmentioning

confidence: 99%

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Mass flow rate correlation for two-phase flow of R218 through a capillary tube

Vinš

Vacek

2009

Applied Thermal Engineering

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This paper presents some experimental results of refrigerant two-phase flow through a capillary tube. The data was obtained for fluorinert refrigerant R218, which is used in some special vapor cooling circuits, e.g. in various particle detectors at the CERN international research centre. An analytical correlation for mass flow rate of R218 was prepared on the bases of dimensionless parameters derived from the Buckingham π-theorem. Two approaches were compared: (a) the conventional power law function and (b) correlation determined with the use of an artificial neural network. Measured data were also correlated with other mass flow rate correlations presented in literature.

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Section: Comparison Of Other Mass Flow Rate Correlationsmentioning

confidence: 68%

Section: Mass Flow Correlation Based On the Power Law Functionmentioning

confidence: 99%

Section: Comparison Of Other Mass Flow Rate Correlationsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Mass flow rate correlation for two-phase flow of R218 through a capillary tube

Vinš

Vacek

2009

Applied Thermal Engineering

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“…Therefore, the exteral optical components of DUV lasers are always sealed in variety of optical modules which usually filled by protective gas, mostly nitrogen [1]. Optical module purification technology was presented in many patents [2][3] [4], and precise pressure control technology was studied [5]. However, the existing research was limited to the study of gas supply pressure control, and did not involve optical module internal flow study and optimization.…”

Section: Introductionmentioning

confidence: 99%

Numerical Analysis and Optimization of Internal Flow Field in Optical Module of DUV Laser

Liu¹,

Ding²,

Wang³

et al. 2017

Proceedings of the 3rd Annual International Conference on Mechanics and Mechanical Engineering (MME 2016)

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Abstract. In this paper, the internal flow field in an optical module of DUV laser was analyzed by ANSYS Fluent based on the finite volume method. The way of purging nitrogen was optimized according to the results of the analysis. After the optimization, a better nitrogen purge method was obtained, and a flow field with uniform velocity and low turbulence energy was obtained on the laser transmission path. The results of this paper can provide a reference for the design of the gas purge system of DUV laser.

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Adiabatic capillary tube flow of carbon dioxide in a transcritical heat pump cycle

Agrawal

Bhattacharyya

2007

Int. J. Energy Res.

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SUMMARYFlow characteristics of an adiabatic capillary tube in a transcritical CO 2 heat pump system have been investigated employing the homogeneous model. The model is based on fundamental equations of mass, energy and momentum which are solved simultaneously. Two friction factor empirical correlations (Churchill, Lin et al., Int. J. Multiphase Flow 1991; 17(1):95-102) and four viscosity models (Mcadams, Cicchitti, Dukler and Lin) are comparatively used to investigate the flow characteristics. Choked condition at the outlet is also investigated for maximum mass flow rate. Subcritical and supercritical thermodynamic and transport properties of CO 2 are calculated employing a precision property code. Choice of viscosity model causes minor variation in results unlike in chlorofluorocarbons (CFCs) refrigerants.Relationships between cooling capacity with capillary tube diameter, length and maximum mass flow rate are presented. A lower evaporating temperature yields a larger cooling capacity due to the unique thermodynamic properties of CO 2 . It is also observed that an optimum cooling capacity exists for a specified capillary tube.

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An experimental analysis of adiabatic capillary tubes

Cited by 126 publications

References 2 publications

Mass flow rate correlation for two-phase flow of R218 through a capillary tube

Mass flow rate correlation for two-phase flow of R218 through a capillary tube

Numerical Analysis and Optimization of Internal Flow Field in Optical Module of DUV Laser

Adiabatic capillary tube flow of carbon dioxide in a transcritical heat pump cycle

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