Transport properties of 1,1,1,2-tetrafluoroethane (R134a)

Krauß, R.; Luettmer-Strathmann, Jutta; Sengers, J. V.; Stephan, Karl

doi:10.1007/bf00502117

Cited by 85 publications

(82 citation statements)

References 35 publications

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“…The better solution in this sense would appear to be the ethane-R134a couple, in which the second #uid is also polar and more similar in general behaviour to the HFCs considered. The R134a viscosity equation has a narrower range of validity (Krauss et al, 1993), which thus limits the applicability range of the model between 0.7 and 1.2 for ¹ and up to 7.4 for P . For a limited choice of alkanes and HFC #uids, Table IV shows a further validation for the new reference couple, together with a comparison with the previous couple.…”

Section: Validation Of the Viscosity Model For Pure Fluidsmentioning

confidence: 98%

“…This is a consequence of the accuracy scattering of the experimental data. In dedcated equations regression, the authors usually take into account only a limited number of data sets, discarding the others because they are likely to be inaccurate (Krauss et al, 1993(Krauss et al, , 1996Hendl et al, 1994;Vogel and KuK chenmeister, 1997;Tanaka and Sotani, 1996).…”

Section: Dedicated Equations For Pure Fluid Viscositymentioning

confidence: 99%

See 1 more Smart Citation

A corresponding states predictive viscosity model based on a new scaling parameter: application to hydrocarbons, halocarbons and mixtures

Scalabrin

Cristofoli

Grigiante

2001

Int. J. Energy Res.

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SUMMARYA three-parameter corresponding states (CS) model is developed, importing methods formerly studied for the volumetric representation of #uids. The three parameters are critical temperature, pressure and a viscosity scaling factor de"ned from experimental saturated liquid viscosity data or, when these are unavailable, from a single experimental point. Two reference #uids are chosen both for their factor value and because the corresponding viscosity dedicated equations (VDE) are available. On the basis of the three-parameter CS model proposed by Teja et al. for volumetric properties, the reduced viscosity of a third #uid is obtained in reduced P, ¹ variables interpolating that of the two reference #uids, calculated at the same reduced temperature and pressure, by .Where the transport property is known along the saturation line at least, an improvement is introduced by correcting the factor with a temperature-dependent function "tted on these data. The model is then extended to mixtures using the one--uid model approach, in a completely predictive mode with respect to the mixture.The accuracy for both pure #uids and mixtures is comparable with that of the reference #uids' equations, while in the unimproved and improved mode the amount of input data is very limited. Also, comparison with a four-parameter CS model and with an ECS model con"rms the accuracy of the present technique. Considering the predictive nature of the model and the scattering of the available experimental data, the mean accuracy is good and more than satisfactory for the purposes of technical applications.

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Section: Validation Of the Viscosity Model For Pure Fluidsmentioning

confidence: 98%

Section: Dedicated Equations For Pure Fluid Viscositymentioning

confidence: 99%

A corresponding states predictive viscosity model based on a new scaling parameter: application to hydrocarbons, halocarbons and mixtures

Scalabrin

Cristofoli

Grigiante

2001

Int. J. Energy Res.

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show abstract

“…These equations have been adopted by several investigators to represent the thermal conductivity of fluids. We have used these equations to represent the transport properties of ethane [4,28,29] argon [34] and R134a [26,32]. The tables that we have prepared for the transport properties of R134a [26] will be included in the Bulletin of the International Engineering Association Annex 18, which effectively means that they will become internationally recommended tables for R134a.…”

Section: T~mentioning

confidence: 99%

Thermophysical properties of supercritical fluids and fluid mixtures. Final technical report, December 15, 1988--December 14, 1994

Sengers¹

1998

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“…1. For comparison, the viscosity correlation of Krauss et al [9] is used as the baseline in Fig. 1, even though it is not recommended for use below 290 K for viscosity (dashed baseline in figure).…”

Section: Introductionmentioning

confidence: 99%

“…1, even though it is not recommended for use below 290 K for viscosity (dashed baseline in figure). The uncertainty in the correlation [9] is estimated to be _+ 5 % as shown in Fig. 1.…”

Section: Introductionmentioning

confidence: 99%

Status of the round robin on the transport properties of R134a

et al. 1995

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The paper contains a status report on an international project coordinated by the Subcommittee on Transport Properties of Conamissiort 1.2 of the International Union of Pure and Applied Chemistry. The project has been conducted to investigate the large discrepancies between the results reported by various authors Ibr the transport properties of RI34a. The project has involved the remeasurenaent of the transport properties of a single sample of R I34a in rdne laboratories throughout the world in order to test the hypothesis that at least part of the discrepancy could be attributed to the purity of Ihe sample. This paper provides an intercomparison of the new experimental results obtained to data in this project Ibr the viscosity and the thermal conductivity in both gaseous and liquid phases. The agreclncnt between the viscosity data from the laboratories contributing to the prc, jcct was improved with several techniques, now producirtg consistent results. This suggests that the purity of the samples of R I34a used in previous work was at least partly rcponsible Ibr the discrepancies observed. For the thermal conductivity in the liquid phasc the resuhs of the measurenlents are also more cortsistenl than before, although nut Ibr all experimental techniques. Nut all of the previous measurements suffered from ~ Invited paper presented at the Twelfth Symposium on Tllermophysical Properties. significant sample impurities, so Ihe present measurements on a consistent high-purity sample can be used to detect data sets v,,hich are outliers, possibly because of impurities. Identification of laboratories and techniques with systematic differences may require the examination of data Ibr several Iluids. The implications for future measurements of the transport properties of other refrigerants are significant.

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Transport properties of 1,1,1,2-tetrafluoroethane (R134a)

Cited by 85 publications

References 35 publications

A corresponding states predictive viscosity model based on a new scaling parameter: application to hydrocarbons, halocarbons and mixtures

A corresponding states predictive viscosity model based on a new scaling parameter: application to hydrocarbons, halocarbons and mixtures

Thermophysical properties of supercritical fluids and fluid mixtures. Final technical report, December 15, 1988--December 14, 1994

Status of the round robin on the transport properties of R134a

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