CPL - Chalmers Publication Library

In-line rheometry of particulate suspensions by pulsed ultrasound velocimetry combined with pressure difference method

Författare och institution:
J. Wiklund (-); B. Birkhofer (-); S. A. K. Jeelani (-); Mats Stading (Institutionen för material- och tillverkningsteknik, Polymera material och kompositer); E. J. Windhab (-)
Publicerad i:
Applied Rheology, 22 ( 4 ) s. Article Number: 42232
ISSN:
1430-6395
Publikationstyp:
Artikel, refereegranskad vetenskaplig
Publiceringsår:
2012
Språk:
engelska
Fulltextlänk:
Sammanfattning (abstract):
The in-line rheometer concept based on the combination of the ultrasonic velocity profiling (UVP) technique and pressure difference (PD) measurements was utilized for investigating the influence of particle concentration and size distribution on the rheology of particulate suspensions in pipe flow under realistic industrial process conditions. Well defined model suspensions were used, consisting of 11 mu m and 90 mu m diameter polyamide particles suspended in rapeseed oil at concentrations ranging from 1 to 25 % by volume. The variation of concentration and particle size distribution had the expected effects on the shear viscositiy of the investigated uni-modal and bimodal suspensions. The in-line results showed that the investigated suspensions exhibit Sisko flow behavior and demonstrated that the UVP+PD method can be used to determine the flow behavior of complex fluids and suspensions, even at high solid concentrations, under industrial conditions in-line. The obtained in-line results were in good agreement with measurement data obtained using a conventional rotational controlled-stress rheometer. Limitations of commercially available transducer technology were identified and other possible sources of inaccuracy of the UVP+PD method were investigated. Several improvements of the UVP+PD measurement method were proposed.
Ämne (baseras på Högskoleverkets indelning av forskningsämnen):
TEKNIK OCH TEKNOLOGIER ->
Materialteknik
Nyckelord:
in-line rheology, particulate suspensions, bimodal suspensions, velocity profiles, wall shear rate, concentrated suspensions, doppler ultrasound, rheological characterization, bimodal suspensions, velocity profiles, flow, viscosity, particle, signals
Postens nummer:
167741
Posten skapad:
2012-12-13 16:35

Visa i Endnote-format