Progress Report on the Determination of Absolute Viscosity

Coe, J. R.

doi:10.1063/1.1745192

Cited by 3 publications

(2 citation statements)

References 1 publication

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“…Th e total delivery for a complete stroke of the piston is 109 cm 3 (1,470 g of m ercury) . The drive shaft makes 2,700 turns in dl'ivin& the piston through thi distance .…”

Section: Ma In Injectormentioning

confidence: 99%

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Absolute viscosity of water at 20-degrees-C

Swindells¹,

Coe²,

Godfrey³

1952

J. RES. NATL. BUR. STAN.

175

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An accurafu knowl edge of t he viscos it ies of liquids in absolute units is of fundamental importance in man y scient ifi c fi elds. Th e meas urement of t hese viscosities is almost universally based upon the absolute viscos ity of water at 20° C as a primary standard. During t he past 50 years t here has been an in creasing need for a more accurate d eterminat ion of t his s tandard. Consequen t ly, with t he coopera tion of t he Society of Rheology and so me financial assistance from t he Chemical Foundation , this proj ect was undert aken by t he National Bureau of Standards and has now been completed.Th e determination was made by t he method of capillary fiow. By means of a calibrated i nj ector, va riou s known constan t rates of flow were prod~c e d in capillaries of m eas ured dim ensions and obser vations were made of the co rrespondmg press ure drops through t he capillari es.' Th e eff ects of t he ends of t he capillaries were r endered negligible by t he s imu ltan eo us t reatment of da ta obt ained with pairs of capi llaries having essent ia lly t he same diam eters but differen t lengths.The value found for t he viscos ity of water is 0.010019 poise as co mpared wi th 0.01005 poise, which has generally been accepted for t he past 30 years. Th e estimated accuracy o f t he !lew determination is ± 0.000003 poise.As a r es ult of this work, begin nin g 0 11 JIIly 1, 1952, the Nat ional Bureau of Standards is plannin g to use t he value 0.01002 poise for t he absolu te v iscos ity of wa:ter at 20° C a s t he basis for the calibrat ion of viscometers and standard-sample otis. It] S r eco mm end ed t hat other laboratories adopt t his value as t he primary refere nce standard for co mparative m eas urem ents of viscosity.

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“…Th e total delivery for a complete stroke of the piston is 109 cm 3 (1,470 g of m ercury) . The drive shaft makes 2,700 turns in dl'ivin& the piston through thi distance .…”

Section: Ma In Injectormentioning

confidence: 99%

“…This work was described in a progr ess r eport in . D ecember 1932 [3]. This part of the proj ect was not completed , because it was fOlmd in 1933 tha t satisfactory capillarie wer e th en being made by the J ena Glass Works in Germany.…”

mentioning

confidence: 99%

Absolute viscosity of water at 20-degrees-C

Swindells¹,

Coe²,

Godfrey³

1952

J. RES. NATL. BUR. STAN.

175

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Viscosity of Water

Coe

Godfrey

1944

Journal of Applied Physics

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Experimental study on factors affecting the end effect in gas viscosity measurement using capillary-tube viscometer

Fang

Yue

et al. 2019

Review of Scientific Instruments

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Because of its simple principle and high adaptability to severe operational conditions, the capillary-tube viscometer has been widely used for viscosity measurement. However, difficulties in accurately correcting the end effect induced measurement deviation will result in great uncertainty for measurement results. In order to solve this problem, in this work, we studied factors affecting the end effect by conducting the high pressure nitrogen viscosity measurement at low flow velocity with an improved capillary-tube viscometer. The experimental results indicated that the influence of the end effect became less significant with the decrease in flow velocity (v) and tube inner diameter (d) and varied inversely with the length of tube (L). We defined the ratio of measured viscosity to standard viscosity obtained from the NIST database as the viscosity deviation coefficient (Ce). From the Ce vs v, Ce vs d, and Ce vs L curves, we have observed that there existed a threshold velocity (vthreshold), a threshold diameter (dthreshold), and a threshold length (Lthreshold) at which Ce got closer to 1.0. It suggested that under certain experimental conditions, the influence of the end effect on gas viscosity measurement became negligible. Based on that, we established end effect free capillary-tube viscometry and compared the nitrogen viscosity results measured by this method with the data provided by the NIST database. The results presented a good match with error within 1.2%. These insights will contribute to improving the accuracy of a capillary-tube viscometer especially under high pressure.

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Progress Report on the Determination of Absolute Viscosity

Cited by 3 publications

References 1 publication

Absolute viscosity of water at 20-degrees-C

Absolute viscosity of water at 20-degrees-C

Viscosity of Water

Experimental study on factors affecting the end effect in gas viscosity measurement using capillary-tube viscometer

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