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Related Experiment Videos

Discontinuous pore fluid distribution under microgravity--KC-135 flight investigations.

Lakshmi N Reddi1, Ming Xiao, Susan L Steinberg

  • 1Dep. of Civil Engineering, Kansas State Univ., Manhattan, KS 66506, USA. reddi@ksu.edu

Soil Science Society of America Journal. Soil Science Society of America
|August 2, 2005
PubMed
Summary

Microgravity had minimal impact on pore fluid blob size in porous media. Particle rearrangement occurred, but wetting fluid distribution remained largely unchanged.

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Area of Science:

  • Space exploration
  • Materials science
  • Fluid dynamics

Background:

  • Reliable plant growth systems are crucial for space exploration.
  • Understanding fluid behavior in porous media under microgravity is essential for space agriculture.
  • Previous research has not fully characterized pore fluid distribution under reduced gravity.

Purpose of the Study:

  • To investigate particle separation and wetting fluid distribution in porous media under simulated microgravity.
  • To determine the effect of microgravity on pore fluid blob-size distributions (BSDs).
  • To assess fluid behavior relevant to in-space crop production systems.

Main Methods:

  • Experiments conducted on NASA's KC-135 reduced gravity aircraft (simulating 1, 1.8, and 0.01 g).
Keywords:
NASA Center JSCNASA Discipline Life Support Systems

Related Experiment Videos

  • Used glass beads as porous media and Hexadecane as the wetting fluid at residual saturation.
  • Employed a nitrogen freezer to solidify Hexadecane ganglia for post-flight BSD measurement.

    • Main Results:

    • Microgravity showed little effect on the size distribution of pore fluid blobs at residual saturation.
    • No significant breakup or coalescence of wetting fluid blobs was observed.
    • Particle separation led to an increase in bulk sample volume and rearrangement of particle groups encapsulating fluid blobs.

    Conclusions:

    • Microgravity does not significantly alter the blob-size distribution of residual wetting fluids in porous media.
    • Particle rearrangement under microgravity can influence the overall structure but not the intrinsic fluid blobs.
    • Findings support the potential for stable fluid management in space-based agricultural systems.