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Monday, July 27, 2020 | History

5 edition of Determination of absolute viscosity by short-tube viscosimeters found in the catalog.

Determination of absolute viscosity by short-tube viscosimeters

Winslow Hobart Herschel

Determination of absolute viscosity by short-tube viscosimeters

by Winslow Hobart Herschel

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Published by Govt. Print. Off. in Washington .
Written in English

    Subjects:
  • Viscosity

  • Edition Notes

    Running title: Absolute visosity by short-tube visosimeters.

    Statementby Winslow H. Herschel, Assistant Physicist, Bureau of Standards. Issued November 9, 1917 ...
    Series[United States] Bureau of Standards. Technologic papers,, no. 100
    Classifications
    LC ClassificationsT1 .U4 no. 100
    The Physical Object
    Pagination55 p. incl. tables, diagrs.
    Number of Pages55
    ID Numbers
    Open LibraryOL6602497M
    LC Control Number17026912
    OCLC/WorldCa13294661

    Determination of absolute viscosity by short-tube viscosimeters. Author Herschel, Winslow Hobart, Published Determination of the moisture content of honey by measurement of the absolute viscosity. An absolute determination of the acceleration Koya University Department of Chemistry Practical Course of Physical Chemistry / 2 n Year *ii For liquid 1, Ti oc hpig For liquid 2, T 2 oc hp 2 g Ti rii hp 2 g r|!p 2 T 2 r\2 h pig r| 2 pi T 2 p 2 ill r| 2 = Ti pi If the absolute viscosity of one liquid is known, that other can be calculated by measuring Ti,T 2. pi and p :// year physical.

      Determination of Mooney Viscosity of Contained Polymer Scope—This test method is designed to measure the viscosity of the contained polymer of anionic stabilized synthetic rubber latices having a residual monomer content of less than % by  › 百度文库 › 互联网. Viscosity structure factor. F. Frictional force. ΔF. Change in free energy with deformation. f. Nominal tensile stress, force/initial cross sectional area. f i. Fraction of chain pairs belonging to topological class i. f(β) Reduced steady shear viscosity function (η−η s)/(η 0 −η s) G. Equilibrium shear modulus. G 0. Instantaneous

    This was found to be mm and made only a small correction in the values of the constants a and b. After the determination of the viscosity coefficient at atmospheric pressure, the pressure was reduced and observations made as before. At first a high value of fre = 97 X The viscosity μ and the thermal conductivity k of the fluid are evaluated at the total temperature of the flow. T w is defined as the temperature which collapses a set of Nu–Re data obtained at different flow temperatures on a single curve. The R 2 coefficient of a fourth-order polynomial fit is used as the selection criterion. This is the


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Determination of absolute viscosity by short-tube viscosimeters by Winslow Hobart Herschel Download PDF EPUB FB2

capillarytube,the"viscosity,"socalled,beingreportedasthe time ofdischarge in seconds, a value which is of little significance unlessthe make of instrument is stated and is well :// Abstract. Running title: Absolute visosity by short-tube es bibliographical of access: Internet A new determination of the electromotive force of Weston and Clark standard cells by an absolute electrodynamometer.

Author Guthe, Karl Eugen, Published: (); Determination of absolute viscosity by short-tube viscosimeters / The Redwood viscometer / by Winslow H. Herschel, Associate Physicist. These viscometers are used to determine the viscosity of petroleum products.

Two adoption of Red Wood viscometer are available No. 1 for liquids having ://   TABLEOFCONTENTS Page IHISTORICALANDTHEORETICAL 1 IISELECTIONANDCALIBRATIONOFTUBES 10 CurvesforDeterminingt^/L 13 IIIDESCRIPTIONOFAPPARATUSANDMANIPULATION 14 An absolute determination of the viscosity of air (Lancaster, Pa., Press of the New era printing company, ), by Lachlan Gilchrist (page images at HathiTrust) The absorption spectra of solutions as studied by means of the ?type=lcsubc&key=Viscosity&c=x.

A basic limitation of a hydraulically pressurized viscometer is the time required to attain the test pressure. In an elastohydrodynamic contact, the lubricant is subjected to an extremely rapid pressure change from ambient to 1 [GPa] or more, as well as a similarly rapid rise in shear rate.

In a typical contact, the shear rate can rise to 10 5 [s − 1] in a period as short as [μs] [12]. The viscosity measurement range is Pa * s. They are widely used to determine the viscosity of high molecular weight liquids and solutions of polymer compounds.

Measurement of viscosity by vibrating viscometers is based on the dependence of the amplitude of body vibrations in the test fluid on its ://   Scope This test method covers the determination of the viscosity in bubble seconds by timing. The bubble seconds are approximately equal to stokes for most liquids.

The test method is applicable to transparent liquids that are free from crystalline or gel particles. This standard does not purport to address all of the safety concerns, if any, associated with its  › 百度文库 › 行业资料.

Viscosity Index (V.I): The viscosity of a liquid decreases with increase in temperature. The change in viscosity with change in temperature is expressed by viscosity index. It is an empirical number indicating the rate of change of viscosity of oil from ˚F to ˚F.

Low viscosity index means a large change in viscosity with change in   U-tube manometer i) Distinguish between ‘absolute pressure’ and ‘gauge pressure. 14 A U-tube manometer is used to measure the pressure of water in a pipe line, which is in excess of atmospheric pressure.

The right limb of the manometer contains mercury and is open to atmosphere. The contact between water and mercury is in the left ://   Measurement of Viscosity— The usual method for measurement of viscosity involves the determination of the time required for a given volume of liquid to flow through a capillary.

Many capillary-tube viscosimeters have been devised, but Ostwald and Ubbelohde viscosimeters are m/html///shtm. A drawback of the DLS method is that it requires the addition of the polystyrene beads leading to dilution of the sample by 10% thus inducing a change of sample composition.

This limits the method to the non-exponential viscosity range at low protein concentrations or to studies requiring relative rather than absolute determination of :// ISBN: X OCLC Number: Description: xvii, pages: illustrations ; 24 cm. Contents: Viscosity --Molar Mass --Execution of Viscosity Measurements --Types of Viscosimeters --Capillary Viscosimeter --Flow Cups --Rotational Viscosimeter --Coaxial Cylinder --Cone and Plate Systems --Parallel Discs --Mooney/Ewart System - The absolute viscosity of the samples was directly determined from the shear stress–shear rate rheograms o ver a temperature range of 20 C–40 C and a polymer concentration range of –1 The Joint Metrology Laboratory LNE-CNAM had an absolute falling ball viscometer, which was operating only at laboratory temperature.

Its development ceased in but resumed inthe aim @article{osti_, title = {Ultrasonic methods for measuring liquid viscosity and volume percent of solids}, author = {Sheen, S H and Chien, H T and Raptis, A C}, abstractNote = {This report describes two ultrasonic techniques under development at Argonne National Laboratory (ANL) in support of the tank-waste transport effort undertaken by the U.S.

Department of Energy in treating low-level Determination of the viscosity-shear behavior of polymer containing fluids using a single pass, high-shear capillary viscometer Book Graham, E.E.

; Klaus, E.E. ; Badgley, R.S. A Penn State, single-pass, capillary high shear viscometer redesigned for use at shear rates up to 10/sup 6/ s/sup -1/ and viscosity levels as low as 2 cp. is ://   Absolute viscosity, T], has units of mass/(length x time) which means that the reducing factor is [ (m E^) 1 ^ 2 r* -2 ]" 1.

Using A and B from equations 36 the reduced absolute viscosity, T] becomes = 71 (BA) r A l/3 m 1/2 (38) where M is the molecular weight. ^ plotted against a reduced temperature, (39) The following testing equipments are used to measure absolute viscosity of viscosity graded paving bitumen (IS::) at C in accordance with IS: (Part II) (similar to ASTM D), which uses a vacuum capillary viscometer.

It may please be noted that any other viscometer such as ://. iv. Measurement of fluid viscosity v. Determination of friction factor as a function of Reynolds number in pipe flow vi.

Studying laminar-turbulent transition for flow in a tube vii. Boundary layer flow over a flat plate viii. Pressure distribution around a circular cylinder in high Reynolds number flow  The viscosity of the resin solutions obtained can then be measured in various manners, such as by measuring the flow time in seconds at 20° C of the resin solution from a measuring cup, the comparative determination of the viscosity of a resin solution with the Gardner-Bubble viscosimeter or by means of the falling ball method according to   determination of mby a new method, lies in the comparatively high velocities at which viscous forces remain the principal cause of resistance.

He concluded his short paper with Many experiments were made on the viscosity of fluids other than water, but as I find that the results do not differ materially from those of Poiseuille it is ~wttsai/Adv_Fluid/Origin of concentric cylinder