An automatic high pressure viscometer

Evaluation of a falling sinker-type viscometer at high pressure using edible oil

“…These are related to experimental data for a variety of calibration fluids, sinker types and dimensions (Irving and Barlow, 1971;Lindgren, 1972;Fulin et al, 1994;Park and Irvine, 1995;Cristescu et al, 2002).…”

Viscosity measurements on gas expanded liquid systems—Methanol and carbon dioxide

“…The falling-weight viscometer has been used extensively in the past for the determination of viscosities in systems under high pressure [9,14,17,[19][20][21][22][26][27][28][29][30][31][32][33][34][35][36][37][38][39][40]. The falling-weight viscometer is relatively simple in construction, is easily adaptable for highpressure applications and typically exhibits high repeatability and accuracy.…”

“…It incorporated a hemispherical leading edge to provide concentric falls and the most reproducible fall times [35,36,39,43]. A fall-weight with a hemispherical leading edge also promoted a smooth and steady velocity profile in the annulus with the tube, as well as a pronounced tendency to selfcentering, as compared to a fall-weight with a flat leading edge [43].…”

“…The fall weight had a flat trailing edge that was slightly chamfered to reduce end effects [35]. The ratio of the fall-weight to fall-tube radii was determined to be >0.93, so as to reduce the occurrence of eccentric falls during operation [35,36,39]. The length of the fall-weight was 67 mm.…”

Development of an Ultrasonic Sensing Technique to Measure Lubricant Viscosity in Engine Journal Bearing In-Situ

“…This type of viscometer, however, presents some limitations such as complex flow and a limited range of viscosity that can be studied. The falling cylinder viscometer by Irving and Barlow (1971) provided considerable improvement because the sinker does not have to travel along all the length of the capillary. This is because the sinker position is detected monitoring the inductance of different coils that are positioned around the viscometer.…”