Numerical prediction of capillary tube behaviour with pure and binary alternative refrigerants

Sami, Samuel M.; Tribes, Christophe

doi:10.1016/s1359-4311(97)00048-3

Cited by 36 publications

(26 citation statements)

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“…-5 -Sami and Tribes [5] or Kritsadathikarn et al [6]. An ANN correlation can be used for predicting refrigerant mass flow for both subcooled and two-phase inlet conditions.…”

Section: Accepted Manuscriptmentioning

confidence: 99%

“…Some of them have used mathematical approaches based on numerical simulations to generate a theoretical model of capillary flow. Most of these models have considered two thermodynamic equilibrium regions of subcooled liquid and a two-phase vapor-liquid mixture [4,5,6,7]. The two-phase flow has been generally simplified as a homogeneous flow with the same velocities of both phases.…”

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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“…-5 -Sami and Tribes [5] or Kritsadathikarn et al [6]. An ANN correlation can be used for predicting refrigerant mass flow for both subcooled and two-phase inlet conditions.…”

Section: Accepted Manuscriptmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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

Vinš

Vacek

2009

Applied Thermal Engineering

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“…In this way, sizing of adiabatic capillary tubes using zeotropic mixtures is a subject of particular interest. It can be pointed out some works in this area in recent years (Bittle & Pate, 1996;Chang & Ro, 1996;Bittle et al, 1998;Sami & Tribes, 1998;Fiorelli, 1998;1999;Wei et al, 1999;Jung et al, 1999;Motta et al, 2000;Fiorelli, 2000). This paper presents the experimental validation of a simulation model for refrigerant mixtures flow through capillary tubes (Fiorelli et al, 1998).…”

Section: Introductionmentioning

confidence: 99%

Experimental Validation of a Cappilary Tube Simulation Model With Refrigerant Mixtures Flow

Fiorelli

Silvares²

2004

RET

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This paper presents the experimental validation of a simulation model for refrigerant mixtures flow through capillary tubes. To perform such validation it was built an experimental apparatus using a blow-down process. It was carried out preliminary tests for characterization of experimental parameters: actual capillary tube diameters; relative roughness; and the heat losses in subcooling/quality control system. It was obtained almost 200 experimental points for R-407C (a zeotropic mixture) and R-410A (a near azeotropic mixture). Complete data set for each point consists of the measured pressure and temperature profiles, mass flow rate and mixture composition, as well as subcooling/quality control system inlet and outlet temperatures and heater electric power consumption for tests with two-phase flow capillary tube inlet conditions. Comparison of simulation and experimental data show a good agreement. Main deviations are connected with the delay of vaporization phenomenon occurrence, experimentally verified by the authors.

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“…The main concern in practical consideration is to determine the appropriate tube diameter and length at a given operating condition. The investigation on the flow characteristics in the capillary tubes has received the most attention [1][2][3][4][5][6][7][8][9] Bansal et al 1 developed a homogeneous two-phase flow model, CAPIL, to study the performance of adiabatic capillary tubes. They used the REFPROP data base to calculate the refrigerants' thermodynamic and thermophysical properties.…”

Section: Introductionmentioning

confidence: 99%

“…They used the REFPROP data base to calculate the refrigerants' thermodynamic and thermophysical properties. Sami et al 7 proposed a numerical model for predicting the capillary tube performance of pure refrigerants (R12, R22, R134a) and binary mixtures (R410A, R410B, R507, R32/R134a). Wong et al 9 developed a homogeneous two-phase flow model to simulate the flow characteristics of R12 and R134a.…”

Section: Introductionmentioning

confidence: 99%

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Kritsadathikarn¹,

Songnetichaovalit²,

Lokathada³

2002

ScienceAsia

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This paper presents the results from a numerical study on the local pressure distribution of some common traditional and alternative refrigerants flowing in adiabatic capillary tubes. The present model developed from the basic conservation law of mass, energy and momentum includes various relevant parameters. A homogeneous flow model is used in the two-phase flow region. Numerical results show that the alternative refrigerants used as examples in the present study consistently give higher pressure gradients than the traditional refrigerants.The present model can be used to simulate and compare the flow characteristics of the other refrigerants. It may be also an important tool for selecting the length of the capillary tube used in household refrigerators and freezers for given operating conditions.

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Numerical prediction of capillary tube behaviour with pure and binary alternative refrigerants

Cited by 36 publications

References 1 publication

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

Experimental Validation of a Cappilary Tube Simulation Model With Refrigerant Mixtures Flow

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