The transport properties of carbon dioxide

Kennedy, John; Thodos, George

doi:10.1002/aic.690070419

Cited by 44 publications

(12 citation statements)

References 43 publications

(19 reference statements)

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“…Numerous viscosity measurements of CO 2 have been carried out since Graham’s first experiments in 1846, 6 but they were not assembled in one comprehensive database. In this work, references for viscosity data of CO 2 from previous analyses 7–15 as well as those included in the current versions of the AIChE DIPPR database, 16 the NIST ThermoData Engine, 17 and the Landolt-Börnstein compilations 18–20 were retrieved to combine all known literature data for the viscosity of CO 2 in one repository.…”

Section: Introductionmentioning

confidence: 99%

Reference Correlation for the Viscosity of Carbon Dioxide

Laesecke

Muzny

2017

Journal of Physical and Chemical Reference Data

111

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A comprehensive database of experimental and computed data for the viscosity of carbon dioxide (CO2) was compiled and a new reference correlation was developed. Literature results based on an ab initio potential energy surface were the foundation of the correlation of the viscosity in the limit of zero density in the temperature range from 100 K to 2000 K. Guided symbolic regression was employed to obtain a new functional form that extrapolates correctly to T → 0 K and to 10 000 K. Coordinated measurements at low density made it possible to implement the temperature dependence of the Rainwater-Friend theory in the linear-in-density viscosity term. The residual viscosity could be formulated with a scaling term ργ/T the significance of which was confirmed by symbolic regression. The final viscosity correlation covers temperatures from 100 K to 2000 K for gaseous CO2, and from 220 K to 700 K with pressures along the melting line up to 8000 MPa for compressed and supercritical liquid states. The data representation is more accurate than with the previous correlations, and the covered pressure and temperature range is significantly extended. The critical enhancement of the viscosity of CO2 is included in the new correlation.

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Section: Introductionmentioning

confidence: 99%

Reference Correlation for the Viscosity of Carbon Dioxide

Laesecke

Muzny

2017

Journal of Physical and Chemical Reference Data

111

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“…Earlier measurements of self-diffusion coefficients ( 3 ) indicated that diffusion coefficients calculated from the Chapman-Enskog theory with the Lennard-Jones ( 12-6) potential and force parameters derived from viscosity data or from low-temperature diffusion data for carbon dioxide are lower than the observed values by 30 to 40% in the range, 1,200" to 1,700"K. This is illustrated in Figure 7 where the authors' self-diffusion data are compared with values predicted by the correlation of Kennedy and Thodos (6) which is based on a combination of low temperature experimental data and kinetic theory calculations. with binary diffusivities calculated from kinetic theory.…”

Section: High Temperature Tracer Dlffuslvltlesmentioning

confidence: 76%

“…5 . CH3T was used as tracer in equimolar carbon di- 6. CH3T was used as tracer in otherwise pure carbon Case 1 gives the self-diffusion coefficient Dii of carbon dioxide.…”

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confidence: 99%

A flow method for measuring transport properties at flame temperatures

1964

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A dynamic diffusion experiment, in which the spread of a tracer material in a laminar stream is followed by appropriate sampling and analytical means, should be well suited for use at high temperatures. Compared with static methods of the Loschmidt type, which have been used at high temperatures in one investigation ( l ) , the dynamic method permits a wider choice of construction materials and shortens significantly the time period required for an experiment.The advantages of the dynamic method were pointed out by Walker and Westenberg ( 2 ) who used the technique for measurements of binary diffusion coefficients up to 1,150"K. These workers preheated the main gas stream to the temperature of the experiment and then made the stream laminar by passing it through a series of screens. They admitted tracer gas through a capillary tube pointed in the direction of flow, sampled downstream with a similar capillary, and analyzed their samples by thermal conductivity methods.Two significant modifications of this scheme are made in the work described here. The hot, laminar gas stream is composed of the combustion products from a thin, flat flame which bums at the base of the apparatus. This permits investigations at higher temperatures because materials problems involved in preheating the gas and making the flow laminar are avoided. The present method also uses radioactive tracer techniques for analysis. This makes possible the measurement of self-diffusion coefficients as well as binary diffusion coefficients and permits extensive cross checking of diffusion phenomena in multicomponent gas mixtures. A brief description of the apparatus, together with selfdiffusion data for carbon dioxide at 1,180" to 1,680"K. has been given previously ( 3 ) . The purpose of this paper is to present a fuller discussion of the construction features of the apparatus and of recent modifications of the apparatus and the method. Self-diffusion and binary diffusion data for the carbon dioxide-methane system at I TemperaturesGeorge Ember is with the American Oil Company, Whiting, Iudiana.

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“…Based on the investigation and analysis of the literature, the research on S-CO 2 Brayton cycle power generation is still in the development stage. Studies on flow and heat transfer in PCHE belong to the field of applied research, and most of them focus on the establishment of the heat transfer correlation and the design of PCHEs [26][27][28][29]. Nevertheless, most studies are based on the assumption that the flow in the PCHE channel is evenly distributed, and few studies consider the uniformity of the flow distribution in each channel of the PCHE, PCHE pressure drops, and heat transfer efficiency, mainly because the flow channel is small.…”

Section: Introductionmentioning

confidence: 99%

Design and Optimization of the Inlet Header Structure in Microchannel Heat Exchanger Based on Flow Distribution Uniformity

et al. 2022

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The flow distribution in a printed circuit heat exchanger (PCHE) is of great theoretical and practical significance in the Brayton cycle power generation system. For the straight barrel inlet header PCHE, when S-CO2 flows in the PCHE, the structural types and working parameters of the inlet header and diversion zone may lead to differences in the flow distribution in each channel of the PCHE. This flow distribution difference affects the thermal hydraulic characteristics of the PCHE. A numerical simulation method was applied to explore the flow uniformity of the PCHE and the overall performance and analyze the influence of the type of straight barrel inlet header PCHE. Within each layer, the flow showed an uneven flow distribution, and the optimized inlet header was the tapered type. The results showed that when the taper angle varies from 6° to 9°, the flow distribution in each layer is relatively uniform. The comprehensive heat transfer performance of the straight-channel PCHE can be improved by 17.3–19.7%. Finally, the response surface and a genetic algorithm were combined to optimize the inlet header. The heat transfer performance of the optimized PCHE was improved by 19.7%.

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The transport properties of carbon dioxide

Abstract: Current interest in the field of nonequilibrium processes requires that values of the transport properties of fluids be available not only at moderate conditions but also at extremes of temperature and pressure. The viscosity, thermal conductivity, and self-digusivity,

Cited by 44 publications

References 43 publications

Reference Correlation for the Viscosity of Carbon Dioxide

Reference Correlation for the Viscosity of Carbon Dioxide

A flow method for measuring transport properties at flame temperatures

Design and Optimization of the Inlet Header Structure in Microchannel Heat Exchanger Based on Flow Distribution Uniformity

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