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Measurement of liquid film thickness and the determination of spin-up radius on a rotating disc using an electrical resistance technique

Lookup NU author(s): Dr John Burns, Professor Colin Ramshaw, Dr Roshan Jachuck

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Abstract

A method of rapid measurement of liquid film thickness on a spinning disc surface is presented. The concepts used are based on the analysis of the electrical resistance of the liquid film and its relationship to film thickness when high frequency voltages are applied. A comparison with the Nusselt model is made for a wide range of operating conditions. Experimental data are presented and calculations of mean radial flow velocity based on film thickness measurements are made and shown to compare well with a simplified two-dimensional model. An empirical model for the extent of the spin-up radius is developed to provide a guide to the zone at which the Nusselt model breaks down. © 2003 Elsevier Science Ltd. All rights reserved.

Publication metadata

Author(s): Burns JR, Ramshaw C, Jachuck RJ

Publication type: Article

Publication status: Published

Journal: Chemical Engineering Science

Year: 2003

Volume: 58

Issue: 11

Pages: 2245-2253

Print publication date: 01/06/2003

ISSN (print): 0009-2509

ISSN (electronic): 1873-4405

Publisher: Pergamon

URL: http://dx.doi.org/10.1016/S0009-2509(03)00091-5

DOI: 10.1016/S0009-2509(03)00091-5

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