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International Society for Industrial Process Tomography

8th World Congress on Industrial Process Tomography

Estimating inline velocity profile of shampoo by electrical resistance tomography (ERT)

Z. Ren1, A. Kowalski2, and T.L. Rodgers1

1School of Chemical Engineering and Analytical Science, University of Manchester, Oxford Road,

Manchester, M13 9PL, United Kingdom

2Unilever R&D, Port Sunlight Laboratory, Quarry Road East, Bebington, Wirral, CH63 3JW, U.K


The rheological properties of fluid systems govern the efficiency and quality of the production process. For certain materials, the local shear rate effects the local viscosity, i.e. non-Newtonian fluids, this local viscosity means that the local conductivity can be different. This paper provides a method of measuring the local velocity of shampoo in an inline pipeline loop using Electrical Resistance Tomography (ERT). Voltage measurements between electrode pairs are taken by ITS P2000 and the data are processed into a 2D conductivity distribution in a MATLAB based ERT tool kit – EIDORS. Linear-back projection (LBP) method is used for solving inverse problem. The change in shear rate leads to a micro-structure change in the shampoo, resulting in an annular conductivity distribution in the cross-sectional view of the pipeline. By varying the flow rate, the different change in conductivity can be obtained. This means that the local velocity of shampoo in the pipeline can be calculated.

Keywords ERT, local velocity, microstructure, EIDORS

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