This paper presents the results of experiments done to determine the effects of cylinder mass and flow regime on the damping and hydrodynamic mass characteristics of a cylinder vibrating in simulated two-phase air-water flows. It was found that two-phase damping varied in inverse proportion to the combined cylinder and two-phase hydrodynamic masses. This is in agreement with a postulated detuning process for damping in two-phase flow. As in earlier studies, the two-phase hydrodynamic mass was found to be less than that calculated from the mixture density, for all flow conditions.
This paper describes the results of experiments conducted to determine the damping and hydrodynamic mass characteristics of a fixed-fixed cylinder both in liquid and in simulated two-phase flows. It was observed that damping was significantly higher in two-phase flow than in single phase flow, and that, depending on the flow regime, it exhibited a maximum or maxima at void fractions of 30% to 60%. The hydrodynamic mass was observed to decrease with increasing void fraction but at a higher rate than that of the mixture density.
An experimental investigation has been undertaken to determine the oxygen transfer rate of a rotating Couette flow oxygenator for low axial annular flow rates. The purpose of this study was to determine if such a device might provide a rational basis for the subsequent design of a blood oxygenator for respiratory support in clinical situations. Using oxygen and degassed water as an analog to oxygen and blood the Sherwood number was determined as a function of the axial Reynolds number and the Taylor number. Results show that oxygen transfer rates can be enhanced by at least ten times over that of the non‐rotating situation, the flow being laminar with vortex flow superposed. The present results were correlated as Sh vs. Ta/Tac over the range of parameters studied.
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