Comparing wire-mesh sensor with neutron radiography for measurement of liquid fraction in foam

Abstract

The liquid fraction of foam is an important quantity in engineering process control and essential to interpret foam rheology. Established measurement tools for the liquid fraction of foam, such as optical measurement or radiography techniques as well as weighing the foam, are mostly laboratory-based, whereas conductivity-based measurements are limited to the global measurement without detailed spatial information of liquid fraction. In this work, which combines both types of measurement techniques, the conductivity-based wire-mesh sensor is compared with neutron radiography. We found a linear dependency between the liquid fraction of the foam and the wire-mesh readings with a statistical deviation less than 15%. However, the wire-mesh sensor systematically overestimates the liquid fraction, which we attribute to liquid bridge formation between the wires.

Neutron radiography of an anisotropic drainage flow

“…The wedge thickness varies over the range 0-5 mm, to emulate liquid fraction values between 0 and 5%. The relative deviation between the estimated and actual wedge thicknesses was within an acceptable range of ±10% [28].…”

70 Jahre Verfahrenstechnik an der TU Dresden

“…Ein vielversprechender Weg mit dieser Problematik umzugehen, sind hybride mechanistische und datengetriebene Modelle. [102], Leitfa ¨higkeitstomographie [103] oder KI-gestu ¨tzter Bildanalyse [104]. Damit wird das Fließverhalten, die Drainage und Stabilita ¨t von wa ¨ssrigen und partikelbeladenen Scha ¨umen untersucht [105].…”

“…Daher nutzt die Emmy‐Noether‐Gruppe von Dr.‐Ing. Sascha Heitkam innovative Messtechniken wie Neutronen‐ und Röntgenradiographie 102, Leitfähigkeitstomographie 103 oder KI‐gestützter Bildanalyse 104. Damit wird das Fließverhalten, die Drainage und Stabilität von wässrigen und partikelbeladenen Schäumen untersucht 105.…”