title: Stabilized flow in capillary-type closed viscometer.
abstract: Small periodic variations in a main gas flow through a capillary are reduced from 1% to 0.1% in peak-to-peak width by a feedback circuit between a pressure gauge and a motor of a pump. The variations in flow result from nonlinear transmission of a worm mechanism in a capillary-type closed viscometer, Dynamical properties of the system are discussed by the Laplace transform method, and it has been shown that low pressure, a long guide tube, and high gain of the amplifier are responsible for the flow instability.
authors.affiliation: National Research Laboratory of Metrology, 10-4, 1-Chome, Kaga, Itabashi-ku, Tokyo, Japan.
authors.forename: H
authors.initials: H
authors.lastname: Kobayashi