A New Method for Liquid Viscosity Measurements: Inclined-Tube Viscometry

Abstract

In this article, a method which can be used to measure the viscosity of liquids with an inclined tube at high pressures and for low-boiling substances is described. The measurement equation was established. The measuring methods for two unknown parameters which are in the measurement equation are presented, and a viscosity measurement system was designed and constructed, which consists of an experimental cell, an inclination-angle control subsystem, a constant temperature subsystem, and a data collection and process subsystem. At atmospheric pressure, the kinematic viscosity of pure water was measured at temperatures from 273.15 K to 333.15 K to demonstrate the performance of the apparatus. The results show that the absolute average relative deviation is 0.84% in comparison with reliable literature values. The kinematic viscosity of saturated liquid R134a and R600a were also measured at temperatures from 273.15 K to 295.15 K and 273.15 K to 300.15 K, respectively, and the corresponding absolute average relative deviations are 1.04% and 1.02% in comparison with reliable literature values. These experimental results demonstrate the performance of the apparatus, while providing estimates of the uncertainty and reliability of the experimental system.

Kinematic Viscosity of R410A and R407C Refrigerant−Oil Mixtures in the Saturated Liquid Phase with Lubricant Mass Fraction in the Range of (0 to 0.0001)

“…Accordingly, the measurement equations can be depicted as follows. η = ρ g R 2 8 k 1 ν = g R 2 8 k 1 Refs and represent the measuring principle and the experimental apparatus in detail. For this measurement, the total expanded experimental uncertainties in temperature, pressure, and viscosity are estimated to be not greater than ± 0.02 K, ± 4 kPa, and ± 0.42 %, respectively.…”

A Review of the Real-Time Monitoring of Fluid-Properties in Tubular Architectures for Industrial Applications

“…Viscosity is usually measured using an off-line laboratory setup [ 138 ], such as capillary viscometer [ 139 ] and mechanical based measuring principles. One of the most reliable methods for viscosity measurements is the laboratory capillary viscometer, and it is the standard methodology used, due to its extreme accuracy [ 139 ].…”

“…Viscosity is usually measured using an off-line laboratory setup [ 138 ], such as capillary viscometer [ 139 ] and mechanical based measuring principles. One of the most reliable methods for viscosity measurements is the laboratory capillary viscometer, and it is the standard methodology used, due to its extreme accuracy [ 139 ]. Capillary viscometers work by measuring the fluid flowrate or the time it takes for a known volume of fluid to flow through a capillary with a fixed length and diameter, or by comparing the measured pressures required to keep a fluid moving with a constant flow rate through capillaries with same diameter and varied lengths [ 140 , 141 , 142 ].…”

A novel design of flow structure model for online viscosity measurement

“…Viscosity sensing methods can be categorised into offline and online methods. Popular offline methods include capillary viscometry [7,8] and falling ball viscometry [9][10][11][12] . Although the offline methods are easy to apply, the measurement accuracy depends on manual operation.…”