Engineering topics
Rudnick, J.
Publications and source records attributed to Rudnick, J..
Test of a new field-theoretical crossover equation-of-state
A new field-theoretical crossover equation-of-state model provides a bridge between the asymptotic behavior close to a liquid-gas critical point and the expected mean field behavior farther away.
Crossover Behavior in the Susceptibility near the (sup 3)He Critical Point
We present high-resolution measurements of the isothermal susceptibility of pure 3He near the liquid-gas critical point.
Finite Size Effects Near the Liquid-Gas Critical Point of (sup 3)He
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Application of G-jitter Calculations to Microgravity Measurements Near the Liquid-Gas Critical Point of (sup 3)He
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Oscillational instabilities in single mode acoustics levitators
An extention of standard results for the acoustic force on an object in a single-mode resonant chamber yields predictions for the onset of oscillational instabilities when objects are levitated or positioned in these chambers. The authors' results are consistent with those of experimental investigators. The present approach accounts for the effects of time delays in the response of a cavity to the motion of an object inside of it. Quantitative features of the instabilities are investigated. The experimental conditions required for sample stability, saturation of sample oscillations, hysteretic effects, and the loss of ability to levitate are discussed.
Determining Equilibrium Position For Acoustical Levitation
Equilibrium position and orientation of acoustically-levitated weightless object determined by calibration technique on Earth. From calibration data, possible to calculate equilibrium position and orientation in presence of Earth gravitation. Sample not levitated acoustically during calibration. Technique relies on Boltzmann-Ehrenfest adiabatic-invariance principle. One converts resonant-frequency-shift data into data on normalized acoustical potential energy. Minimum of energy occurs at equilibrium point. From gradients of acoustical potential energy, one calculates acoustical restoring force or torque on objects as function of deviation from equilibrium position or orientation.