The induction of electromotive forces in a moving liquid by a magnetic field, and its application to an investigation of the flow of liquids

Abstract

A magnetic field induces electromotive forces in a moving liquid, and by investigation of the e.m.fs. produced by a known magnetic field it is possible to obtain information about the distribution of velocities in the liquid. Experiments on the flow through straight tubes show that potential differences of the order of 10^-4 to 10^-3 volts, set up by a magnetic field in a moving liquid consisting of an aqueous solution of copper sulphate, can be satisfactorily measured. Observations on the flow through curved tubes have also been made.