A wide-range (up to 1010 P) rotating cylinder viscometer

Abstract

A Wide-Range (up to 10 10 P) Rotating Cylinder Viscometer Albert Napolita no, Pedro B. Macedo, and Earl G . Hawkins (M ay 17, 1965) . 1~he ra nge of a hi g h temperature rota Ling cylinde r v iscometer has bee n extended so t hat VISCOSIty m easuremen.ts can be m ad e betwee n 10 0 to 10 10 p oises to within 2-p ercen t a ccuracy. ThiS lllvolves three different tec hniques . After a calibration consta nt has been determined for the apparatus III the stand ard oil range, the other two constants for t he hi g her viscosit ies \-v ere se lf~d etermlll e d . In ma klllg measurements at t he low viscosities, 10 0 to 10 5 poises, the o~ter e~l~nd e r J 7 S, ro t.ated at co ns tant sp ee~ a nd the torque measured on the inner cylinder ; flO~ 10 · to 10.·' pOIses the 111l1~1~ cyll11der IS rotated t hrough a n a ngle a nd timed as i t r eturns ~o Its zero pOSitIOn, and fr~m 10°. 0 to 10 10 poises the inner cy~incl er is drive n t hrough a n a ngle at co nstant to rque and tuned as It traverses t hiS a ng le. fhc Fulcher equation viscosity va lues obtall1ecl from prevIOus m~as ur e m e nts on Stan da rd Glasses No . 710 and No. 711 by t h e fiber elongat ion a nd rotatmg cylmclcr methods have been compared with the presen t results.

Analysis of low temperature viscosity data for three NBS standard glasses

“…In th e past few years three types of glasses [1][2][3][4] I have been esta bli shed as vi scosity standards in a standard refe rence material program at the National Bureau of Standards. The ch aracterization of these glasses has involved exte nsive meas ure me nts of viscosities for eac h of th ese glasses at high and low te mperatures.…”

“…717 , a borosilicate have been certified for viscosity form 10 2 to 10 12 P (poise). The viscosity determinations were made by the rotating cylinder meth od [1][2][3][4] at high temperatures, and by th e fibe r elongation [1] and beam-be nding methods [5] at the lower temperatures. Recently, a parallelplate me thod [6] was used to meas ure viscosities in th e intermediate temperature range by one of the laboratories involved in the round-robin measureme nts on th ese glasses.…”