A new portable field rotational viscometer for high-temperature melts - Université Clermont Auvergne Access content directly
Journal Articles Review of Scientific Instruments Year : 2023

A new portable field rotational viscometer for high-temperature melts

Abstract

Mounted on top of furnaces, laboratory viscometers can be used for the rheological characterization of high temperature melts, such as molten rocks (lava). However, there are no instruments capable of measuring the viscosity of large volumes of high temperature melts outside the laboratory at, for example, active lava flows on volcanoes or at industrial sites. In this article, we describe a new instrument designed to be easy to operate, highly mobile, and capable of measuring the viscosity of high temperature liquids and suspensions (<1350 ○ C). The device consists of a torque sensor mounted in line with a stainless-steel shear vane that is immersed in the melt and driven by a motor that rotates the shear vane. In addition, a thermocouple placed between the blades of the shear vane measures the temperature of the melt at the measurement location. An onboard microcomputer records torque, rotation rate, and temperature simultaneously and in real time, thus enabling the characterization of the rheological flow curve of the material as a function of temperature and strain rate. The instrument is calibrated using viscosity standards at low temperatures (20-60 ○ C) and over a wide range of stress (30-3870 Pa), strain rate (0.1-27.9 s −1), and viscosity (10-650 Pa s). High temperature tests were performed in large scale experiments within ∼25 l of lava at temperatures between 1000 and 1350 ○ C to validate the system's performance for future use in natural lava flows. This portable field viscometer was primarily designed to measure the viscosity of geological melts at their relevant temperatures and in their natural state on the flanks of volcanoes, but it could also be used for industrial purposes and beyond.
Fichier principal
Vignette du fichier
Chevrel_et_al_RSI_pre-print.pdf (6.2 Mo) Télécharger le fichier
Origin : Publisher files allowed on an open archive

Dates and versions

hal-04262199 , version 1 (27-10-2023)
hal-04262199 , version 2 (28-02-2024)

Identifiers

Cite

M O Chevrel, T. Latchimy, L. Batier, Romain Delpoux, M. Harris, et al.. A new portable field rotational viscometer for high-temperature melts. Review of Scientific Instruments, 2023, 94 (10), ⟨10.1063/5.0160247⟩. ⟨hal-04262199v2⟩
91 View
11 Download

Altmetric

Share

Gmail Facebook X LinkedIn More