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Transport from higher order g-jitter effects.

Robert J Naumann1

  • 1Center for Microgravity and Materials Science, University of Alabama in Huntsville, Huntsville, Alabama 35899, USA. naumannr@email.uah.edu

Annals of the New York Academy of Sciences
|November 26, 2002
PubMed
Summary

Spacecraft vibrations can impact experiments. Second-order fluid flows, though small, can cause significant transport in microgravity environments like the International Space Station (ISS).

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Area of Science:

  • Fluid dynamics
  • Microgravity science
  • Spacecraft engineering

Background:

  • Complex spacecraft like the International Space Station (ISS) experience vibrations from crew and machinery.
  • The impact of this vibratory environment on microgravity experiments is not fully understood and is a concern for users.
  • Vibrations, arising from internal forces, typically average to zero net acceleration over time.

Purpose of the Study:

  • To investigate how spacecraft vibrations affect fluid behavior and experiment outcomes.
  • To understand the mechanisms of net transport in fluids subjected to periodic accelerations.
  • To analyze higher-order effects that may lead to significant transport despite zero-average acceleration.

Main Methods:

  • Examined first-order and second-order fluid flows driven by periodic accelerations.
  • Utilized perturbation analysis to derive approximate analytical solutions for second-order flows.
  • Validated analytical models against numerical computations.
  • Applied analytical models to predict the effects of the ISS vibratory environment on experiments.

Main Results:

  • First-order flows and associated thermal/solutal fluctuations driven by vibrations time-average to zero.
  • Second-order flows, arising from non-linear terms or asymmetric accelerations, exhibit non-zero time averages.
  • Analytical solutions for second-order flows closely match numerical results.
  • Second-order flows, despite being smaller than first-order flows, can induce significant net transport.

Conclusions:

  • Spacecraft vibrations can lead to non-negligible fluid transport through second-order effects.
  • Understanding these higher-order transport mechanisms is crucial for designing and interpreting microgravity experiments on the ISS.
  • Analytical models provide a valuable tool for predicting and mitigating the impact of vibrations on sensitive experiments.

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