Streaming currents in turbulent flows and metal capillaries. III. Experiment (1). Aim and procedure

Abstract

With a preliminary liquid high tension generator a tension of 70 kV at a current of 0.1μA has been reached.

The measurements on the streaming current have been carried out by means of a simple compensation method which allows us to detect currents up from 3 × 10−13A. It is possible to distinguish the contributions of the pure streaming current and the exchange of charge between liquid and tube wall.

Measurements have been performed with refined gasoline flowing through a number of brass capillaries varying in length from 15 to 60 mm, in diameter from 0.5 to 3 mm, and of different cross-section shape, entrance disturbance and wall roughness.

It appeared from introductory measurements that a stationary situation may not be reached until after some minutes.