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Simulated microgravity in the ring-sheared drop.

Patrick M McMackin1, Shannon R Griffin1, Frank P Riley1

  • 11Mechanical, Aerospace, and Nuclear Engineering, Rensselaer Polytechnic Institute, Troy, NY 12180-3590 USA.

NPJ Microgravity
|January 8, 2020
PubMed
Summary
This summary is machine-generated.

The ring-sheared drop technique simulates microgravity to study fluid interfaces. Increased surface shear viscosity leads to greater drop deformation, impacting amyloid fibril formation studies.

Keywords:
BiophysicsFluid dynamics

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Area of Science:

  • Fluid dynamics
  • Materials science
  • Biophysics

Background:

  • The ring-sheared drop technique is utilized on the International Space Station.
  • It investigates sheared fluid interfaces and their role in amyloid fibril formation.

Purpose of the Study:

  • To simulate microgravity conditions in a laboratory setting.
  • To analyze the deformation of a fluid drop under shear stress.
  • To understand the relationship between surface shear viscosity and drop deformation.

Main Methods:

  • A density-matched liquid was used to simulate microgravity.
  • A drop was sheared using rotating rings.
  • The balance between viscous, inertial, and capillary forces was analyzed.

Main Results:

  • Drop deformation was observed to increase with higher surface shear viscosity.
  • Viscous and inertial forces were found to balance capillary forces during shearing.
  • The study provides evidence for the impact of surface shear viscosity on fluid drop shape.

Conclusions:

  • The ring-sheared drop method effectively simulates microgravity for fluid interface studies.
  • Surface shear viscosity significantly influences fluid drop deformation.
  • Findings are relevant for understanding amyloid fibril formation in microgravity.