Foam concentrates: Viscosity and flow characteristics

A method to describe and measure the flow characteristics of non-Newtonian foam concentrates is presented. Comparative test with the cone and plate viscometer and flow tests in pipes show that it is possible to determine the so-called rheological constants that fit an empirical model, called the Her...

Full description

Saved in:
Bibliographic Details
Published in:Fire technology 1997-12, Vol.33 (4), p.336-355
Main Authors: Bobert, Magnus, Persson, Henry, Persson, Bror
Format: Article
Language:English
Subjects:
Flow characteristics
Orifices
Pipes
Rheology
Shear stress
Steel pipes
Viscosity
Working conditions
Citations: Items that cite this one
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary:A method to describe and measure the flow characteristics of non-Newtonian foam concentrates is presented. Comparative test with the cone and plate viscometer and flow tests in pipes show that it is possible to determine the so-called rheological constants that fit an empirical model, called the Herschel-Bulkley model, in order to define the viscosity characteristics. The correlation between pressure drop calculations based on viscosity data from cone and plate measurements and actual measured pressure drops in the pipes was very good. Flow tests through orifices showed that test results with non-Newtonian liquids differ from tests with water, especially by a lower loss coefficient. Similar flow tests through various components showed a difference between non-Newtonian liquids and water but, in this case, the loss coefficient was higher. Pressure drop calculations for practical applications based on data obtained from the cone and plate viscometer indicate the need for viscosity and flow characteristics for foam concentrates.
ISSN:0015-2684
1572-8099
DOI:10.1023/A:1015388210489