Transitional Phenomena in Oscillating Liquid Columns

Abstract

<p>The damping of free oscillations in liquid-filled U-tube manometers was investigated. The laminar damping coefficients determined were in good agreement with those obtained in previous studies; allowances were made for the secondary flow patterns existing. Two Reynolds numbers were used to characterize the onset of turbulence for both fully-developed and boundary layer type velocity profiles occurring in the system. There is evidence that transition in oscillating liquid columns is influenced by the internal tube surface, and the transition height may well be dependent on the damping exponent for the turbulent flow prior to transition.</p>