557 2009,21(4):557-563 DOI: 10.1016/S1001-6058(08)60184-5 MEASUREMENT OF SOLID SLURRY FLOW VIA CORRELATION OF ELECTROMAGNETIC FLOW METER, ELECTRICAL RESISTANCE TOMOGRAPHY AND MECHANISTIC MODELLING * XU Jing-yu, WU Ying-xiang, ZHENG Zhi-chu Institute of Mechanics, Chinese Academy of Sciences, Beijing 100190, China, E-mail: xujingyu@imech.ac.cn WANG M., MUNIR B., OLUWADAREY H. I., SCHLABERG H. I., WILLIAMS R. A. School of Process, Environmental and Materials Engineering, University of Leeds, Leeds, UK (Received April 15, 2009, Revised May 25, 2009) Abstract: The study presented here was carried out to obtain the actual solids flow rate by the combination of electrical resistance tomography and electromagnetic flow meter. A new in-situ measurement method based on measurements of the Electromagnetic Flow Meters (EFM) and Electrical Resistance Tomography (ERT) to study the flow rates of individual phases in a vertical flow was proposed. The study was based on laboratory experiments that were carried out with a 50 mm vertical flow rig for a number of sand concentrations and different mixture velocities. A range of sand slurries with median particle size from 212 ȝm to 355 ȝm was tested. The solid concentration by volume covered was 5% and 15%, and the corresponding density of 5% was 1078 kg/m 3 and of 15% was 1238 kg/m 3 . The flow velocity was between 1.5 m/s and 3.0 m/s. A total of 6 experimental tests were conducted. The equivalent liquid model was adopted to validate in-situ volumetric solids fraction and calculate the slip velocity. The results show that the ERT technique can be used in conjunction with an electromagnetic flow meter as a way of measurement of slurry flow rate in a vertical pipe flow. However it should be emphasized that the EFM results must be treated with reservation when the flow pattern at the EFM mounting position is a non-homogenous flow. The flow rate obtained by the EFM should be corrected considering the slip velocity and the flow pattern. Key words: slurry measurement, Electrical Resistance Tomography (ERT), Electromagnetic Flow Meters (EFM), in-situ mean volumetric fraction, slip velocity 1. Introduction Slurry is an essential mixture of solid and liquid, and its physical characteristics are dependent on many factors such as the size and concentration distributions of solids in the liquid phase, size of the conduit, level of turbulence, temperature, and absolute (or apparent) viscosity of the carrier. The transport of solid-liquid slurries over short and medium distances via pipelines is very important in many industrial applications [1,2] . * Project supported by the China-UK joint project of a study of multi-phase flow meter on EIT and CTA Techniques: Royal Society (Grant No. 15933). Biography: Xu Jing-yu (1975-), Male, Ph. D. Local solid hold-up is one of the most important hydrodynamic characteristics, which is needed for the design, analysis and performance estimation of liquid-solid two-phase flow and pipeline transportation systems. Electromagnetic Flow Meters (EFM) have been successfully applied to measure mean velocities of single-phase liquid in industry. Continuous efforts have been made to determine the characteristics of two-phase flow using electromagnetic flow meters, since such meters do not introduce a pressure drop and can provide a fast response to changes in the flow. Thus, there are many potential applications for electromagnetic flow meters in two-phase flows. However, due to the complexity of multiphase flow in