MEASUREMENTS OF P.RHO.T PROPERTY AND SATURATION PROPERTIES FOR N-BUTANE AT PRESSURES TO 200MPA
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Accession number;07A0043227
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| Title;MEASUREMENTS OF P.RHO.T PROPERTY AND SATURATION PROPERTIES FOR N-BUTANE AT PRESSURES TO 200MPA |
| Author;
MIYAMOTO HIROYUKI
(Keio Univ., Faculty of Sci. and Technol., JPN)
SHIGETOYO KENJI
(Keio Univ., Faculty of Sci. and Technol., JPN)
UEMATSU MASAHIKO
(Keio Univ., Faculty of Sci. and Technol., JPN)
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Journal Title;Thermophys Prop
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Journal Code:X0031A
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ISSN:0911-1743
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VOL.27th;NO.;PAGE.74-76(2006)
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| Figure&Table&Reference;FIG.5, REF.15 |
| Pub. Country;Japan |
| Language;Japanese |
| Abstract;We have already reported the experimental P.RHO.T property data for isobutane and propane in the wide ranges of temperatures at pressures up to 200MPa by means of bellows valuable volumometer, which can obtain the absolute density of the sample fluid directly. In this study, we report new measurement results for n-butane. Figure 1 shows present metal-bellows valuable volumometer. The purity of the n-butane sample was 99.97mol%. The expanded uncertainties (k=2) in temperature, pressure, and density measurements have been estimated to be less than 3mK, 1.5kPa (p.LEQ.7MPa), 0.06% (7MPa<p.LEQ.50MPa), 0.1% (50MPa<p.LEQ.150MPa), and 0.2% (p>150MPa), and 0.09%, respectively. In region more than 100MPa at 280K and 440K, the uncertainty in density measurements rise up to 0.13% and 0.22%, respectively, due to the uncertainty in density of IAPWS-95 formulation of water used for the calibration of the inner volume of the bellows container. Figures 2 through 4 show comparisons of the present vapor pressures, saturated liquid densities, and P.RHO.T properties with calculated values from the present correlations and the available equation of state by Miyamoto and Watanabe, respectively. Throughout the present study, we observed the reproducibility of the available equations of state to the present measurements for n-butane in the ranges over the range of validity of the models, from which the necessity of the improvements for the available models can be confirmed. (author abst.) |
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