Rolling-ball viscometer for measuring viscosity of fluids at high pressures and moderate temperatures

1968 ◽  
Vol 40 (11) ◽  
pp. 1751-1753 ◽  
Author(s):  
E. M. Stanley ◽  
R. C. Batten
Keyword(s):  
High Pressures ◽  
Rolling Ball ◽  
Rolling Ball Viscometer

Oil Film Thickness and Rolling Friction in Elastohydrodynamic Point Contact

1971 ◽  
Vol 93 (3) ◽  
pp. 371-379 ◽  
Author(s):  
R. Gohar
Keyword(s):  
Film Thickness ◽  
Tungsten Carbide ◽  
Material Properties ◽  
High Pressures ◽  
Glass Plate ◽  
Point Contact ◽  
Rolling Friction ◽  
Significant Alteration ◽  
Oil Film ◽  
Rolling Ball

The effect of material properties upon the film thickness in elastohydrodynamic point contact is demonstrated with a rolling ball and plate machine. A 220 fold range of Young’s modulus is employed and a maximum Hertzian pressure of 5 × 105 lb f/in2 is reached. The oil film, which is measured by interferometry, shows no significant alteration at such high pressures, and is also fairly insensitive to the choice of bounding materials. Using a technique similar to that employed by Crook, the rolling friction between a tungsten carbide and a glass plate is found and compared with theory. The effect of spin is investigated and found to be slight.

Rolling Ball Viscometer

1943 ◽  
Vol 15 (3) ◽  
pp. 212-218 ◽  
Author(s):  
Robert Hubbard ◽  
George Brown
Keyword(s):  
Rolling Ball ◽  
Rolling Ball Viscometer

A VISCOMETRIC METHOD FOR THE ESTIMATION OF MILK CELL COUNT

1970 ◽  
Vol 33 (8) ◽  
pp. 351-354
Author(s):  
W. G. Whittlestone ◽  
L. R. Fell ◽  
H. De Langen
Keyword(s):  
Cell Count ◽  
Correlation Coefficient ◽  
Coefficient Of Variation ◽  
Rolling Ball ◽  
Simple Apparatus ◽  
Microscopic Count ◽  
Rolling Ball Viscometer

The use of a rolling ball viscometer to estimate the cell count of milk treated with California Mastitis Reagent is described. The method compares favorably with the direct microscopic count and requires relatively simple apparatus and unskilled operators. A correlation coefficient for mean count and log viscometer time of 0.93 with a coefficient of variation of 8.1% were obtained. The repeatability of viscometer readings was 0.97.

A High Pressure Rolling-Ball Viscometer up to 1 GPa

1986 ◽  
Vol 25 (Part 1, No. 7) ◽  
pp. 1091-1096 ◽  
Author(s):  
Masaya Izuchi ◽  
Ken Nishibata
Keyword(s):  
High Pressure ◽  
Rolling Ball ◽  
Rolling Ball Viscometer

Methods to Detect Abnormal Milk – A Review

1980 ◽  
Vol 43 (1) ◽  
pp. 58-64 ◽  
Author(s):  
W. A. GORDON ◽  
H. A. MORRIS ◽  
V. PACKARD
Keyword(s):  
Somatic Cell ◽  
Cell Count ◽  
Somatic Cell Count ◽  
Detection Methods ◽  
Rolling Ball ◽  
California Mastitis Test ◽  
Mastitic Milk ◽  
Rolling Ball Viscometer

Screening and confirmatory methods for detecting abnormal milk, mastitic milk, or milk of high somatic cell count are reviewed. Those procedures reviewed in some detail include the Catalase Test. Brabant Mastitis Reaction, pH and chlorine analysis, Ruakura Rolling Ball Viscometer method. California Mastitis Test (CMT), Wisconsin Mastitis Test (WMT), Optical Somatic Cell Count (OSCC). Direct Microscopic Somatic Cell Count (DMSCC), and Electronic Somatic Cell count (ESCC). Other detection methods are tabulated.

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