Viscometric property

Fitzgerald, F.D., Viscometric properties of an ultra-fine coal-water suspension, Ph.D. thesis, UMIST (1990). 

If the material whose viscometric properties were determined in question 3-4 were pumped through a 25 mm diameter pipe so that the wall shear stress had the value corresponding to the last measurement in that question, what would be the volumetric average velocity and what value of pressure gradient would be required ... 

The second approach to measurement of viscometric properties, that of using a pipe of the same diameter as the heat transfer test section, has the advantage that simple and direct measurements under conditions... 

Quadrat, O. Viscometric properties of the concentrated polymer solutions. II. Dependence of the non-newtonian viscosity on the thermodynamic quality of the solvent and on its viscosity. Collection Czech. Chem. Commun. 37,3039-3041 (1972). 

Harris,E.K, Jr. Viscometric properties of polymer solutions and blends as functions of concentration and molecular weight. Ph. D. thesis, University of Wisconsin, 1970. 

Nakatsuka, R. The viscometric properties of polyesters. II, Viscosities in the range of low temperature near the glass transition point. Bull. Chem. Soc. Japan 37, 403 (1964). 

BCURA. "The Chemical Composition and the Viscometric Properties of the Slags Formed from Ashes of British Coals" British Coal Utilization Research Association Report Leatherhead, U.K., 1963. 

Kokufuta E. Electrophoretic and viscometric properties of poly(dicarboxylic acids). Polymer 1980 21 177-182. 

Miller, S.-A., Dean, D., Ganguli, S., Abdalla, M., and Bovell-Benjamin, A.C. 2003. Physicochemical and viscometric properties of a sweetpotato syrup. Paper presented at ARD 2003. Association of Research Directors, Inc., 13th Biennial Research Symposium, March 29-April 2, Atlanta, GA. 

Larson, R.G. and Fredrickson, G.H. (1987) Viscometric properties of block polymers near a critical point Macwmolecules, 20 (8), 1897-1900. 

Viscometric properties of the three polymer systems were studied under dilute (<1%) and concentrated (10%) conditions utilizing an Ubbelohde dilution viscometer for the former and a cone-plate Brookfield digital viscometer for the latter. Polymer samples were dissolved in an agpropriate salt solution. Viscosities were determined at 25 0.i C taking precautions to keep all solutions dust free. 

At present, the lack of any universal model allowing an exact evaluation of viscometric properties of pure liquids and liquid mixtures is mainly due to two unsolved questions 1) no comprehensive theory describing the interactions at the molecular level between similar and/or unlike species is known 2) deviations from ideality are not predicted neither in sign nor in intensity by the common thermodynamic liquid solution principles [14-19]. Both problems are unlikely to be solved in the very near future, even if there is much interaction information. 

A further aspect regarding the viscometric properties of liquid real systems which must be carefully considered when investigating this property—and in particular when one would expect reliable information on specific interactions between components—is represented by the choice of experimental measurement technique because it is possible to obtain two different quantities, such as kinematic viscosity (v/cSt, IcSt = Kk V) or dynamic viscosity (v/cP, IcP = lmPa s). These properties can be interconverted by the fundamental relation... 

Over the last three decades, many researchers have studied the viscometric properties of the multigrade industrial and automotive oils over a wide temperature range using various combinations of VII in different base stocks (Abou El Naga et al., 1998 Alexander et al., 1989 Coutinho et al., 1993). One of the major problems with many of the VII is their tendency to undergo permanent reduction of viscosity as a result of mechanical shearing which occur in most of the mechanical system (Bartz, 1999 Hassanean et al., 1994 Jain et al., 2000). 

These technologies are effective on a wide range of hydroprocessed stocks of varying wax content from light grades to Brightstock. Basestocks from these processes typically have superb low temperature viscometric properties. 

In the last step, the fraction above about C20 is selectively hydroisomerized into iso-paraffins, yielding basestocks with viscosities ranging from about 3 to 10 cSt 100°C (or higher, depending on the technology). Catalysts used in preliminary demonstrations are in the same family as those used today for hydrodewaxing of hydroprocessed petroleum streams. They create very stable isoparaffinic basestocks with exceptional high and low temperature viscometric properties and low volatility. 

PAO have superior viscometrics properties compared to mineral oil base stocks. 

Compared to traditional PAOs, SpectraSyn Ultra PAO have even higher VI, lower pour point and are available in higher viscosity ranges. This unique class of fluid can be used in automotive engine oil and industrial oil formulations to provide advantages in terms of shear stability, viscometrics properties, thickening power and increased lubricant film thickness. 

The most common polyols used to produce S5mthetic polyol ester base stocks are pentaerythritol (PE), trimethylolpropane (TMP) and neopentylglycol (NPG), (Figure 6). By carefully choosing the degree of branching and size of the acid functions, polyol esters with excellent viscometric properties - high VI and very low pour points - can be produced (Table 6). 

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