Preferred Flow Rates in the Helium II Film
We wish to report on our most recent results in an extended series of experiments designed to investigate the reproducibility of helium film flow rates out of a Pyrex beaker at a temperature of 1.35°K. The experimental apparatus and procedures are described in detail elsewhere.1 The basic technique involved the use of a coaxial capacitance depth gauge and associated bridge circuit to monitor changes in the helium level in the beaker. The method allowed an accurate determination of the flow rate every 10 sec. A fountain pump in the experiment space was used to change the level in the beaker by controlled amounts.
KeywordsCritical Velocity Optical Data Experiment Space Helium Surface Height Dependence
Unable to display preview. Download preview PDF.