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Aseptic Zero Discharge Fluid Dynamic Gauging for Measuring the Thickness of Soft Layers on Surfaces

Accepted version
Peer-reviewed

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Type

Article

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Authors

Wang, S 
Schlüter, F 
Gottschalk, N 
Scholl, S 
Wilson, DI 

Abstract

jats:titleAbstract</jats:title>jats:pA bench‐top device that can be used to perform fluid dynamic gauging measurements of soft solid layers with zero net liquid discharge and potentially under aseptic (closed system) conditions is demonstrated. Test results are presented for Newtonian liquids with a range of viscosities: deionized water, sucrose solutions, glycerol/water solutions and paraffin oil. The experimental data for discharge coefficient jats:italicC</jats:italic>jats:subd</jats:sub> against clearance/nozzle throat diameter gave good agreement with CFD simulations and literature. The influence of surface roughness was studied by making measurements on a series of commercial sandpapers. The rough surfaces gave rise to systematic differences in jats:italicC</jats:italic>jats:subd</jats:sub> from those obtained with smooth substrates. Careful calibration is required when gauging rough surfaces.</jats:p>

Description

Keywords

Aseptic, Film thickness, Fluid dynamic gauging, Scanning, Surface roughness

Journal Title

Chemie-Ingenieur-Technik

Conference Name

Journal ISSN

0009-286X
1522-2640

Volume Title

88

Publisher

Wiley
Sponsorship
Development of the ZFDG concept was supported by the Royal Society's Paul Instrument Fund. The test rig was constructed by the technical team, in particular Karl Karrenführer, Jörg Leppelt and Sven Lorenzen, at the Institute for Chemical and Thermal Process Engineering, Technische Universität Braunschweig. Funding from Fitzwilliam College for Shiyao Wang is also gratefully acknowledged.