Foreword

Acknowledgements

Nomenclature

1 Introduction

2 Basic equations and solution methods

3 Characteristics of EM flow meters in closed
conduits

4 Electromagnetic velocity probe

5 Effect of Two-phase flow

6 Flow reconstruction

7 Dry Calibration

A Mathematical formulae

B Special functions and their properties

C 'Alternating interaction' method

D Symmetry and uniformity of weight function

E Some computation programs by Matlab

The magnetic flowmeter uses Faraday's law of induction to measure the flow of a liquid in a pipe. It provides completely obstruction-less measurement and is insensitive to fluid type and properties such as temperature, pressure or viscosity making it one of the most flexible and universally applicable flow measurement systems. Importantly they can be used with a wide range of fluids, including those with suspended particles making such flow meters ubiquitous in industrial and municipal settings from food preparation to nuclear reactors.

This book describes of basic principles of electromagnetic induction measurements and consolidates the outcomes of recent research. It encompasses pipeline electromagnetic flow meters, electromagnetic flow meters, multiphase flow electromagnetic flowmeters and flow field of electromagnetic induction reconstruction. Though theoretical in nature it does draw on experimental data and includes new research findings, especially in the areas of multiphase flow and flow reconstruction. With a focus on theory and computation in flow measurement by electromagnetic induction including traditional flowmeters in closed conduits, velocity probe, two-phase flow, velocity reconstruction and dry calibration it will be an invaluable resource for researchers and practising engineers. The book uses MATLAB® to introduce efficient numerical methods to model and simulate flows, sensor construction and geometry, and the effect of pipe materials.

Xiao-Zhang Zhang studied at Tsinghua University from 1978 to 1983 for his first degree in engineering physics, he obtained his master's degree at Southern East University in 1986 studying insertion turbine flowmeter, and a PhD from Hohai University in 1989 studying electromagnetic induction flow measurement. After working as a lecturer in Nanjing Aeronautic and Astronautic University, he went to Cranfield University in 1991 to research electromagnetic flow measurement probes with the support of the Royal Society. He returned to China the following year and moved to Tsinghua University in 1994. He is now a professor in engineering physics, lecturing and working on machine vibration and mechanical measurement. He was previously director of the Institute of Technical Physics at Tsinghua and has been a visiting professor at Cambridge University and Cranfield Institute of Technology, as well as an editorial board member for the journal Flow Measurement and Instrumentation.