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Laboratory Drop Towers for the Experimental Simulation of Dust-aggregate Collisions in the Early Solar System
09:44

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Published on: June 5, 2014

Building designed granular towers one drop at a time.

Julien Chopin1, Arshad Kudrolli

  • 1Department of Physics, Clark University, Worcester, Massachusetts 01610, USA. jchopin@clarku.edu

Physical Review Letters
|December 21, 2011
PubMed
Summary
This summary is machine-generated.

Researchers observed the formation of stable granular towers from dripping grain-liquid mixtures onto absorbent surfaces. The study details factors influencing tower growth, height, and width, revealing diverse structures based on impact velocity and liquid flux.

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Area of Science:

  • * Fluid Dynamics: Investigating the behavior of granular suspensions and their interaction with porous media.
  • * Materials Science: Understanding the rapid solidification and structural formation of granular materials.
  • * Soft Matter Physics: Analyzing the mechanical stability and morphological characteristics of self-assembled granular structures.

Background:

  • * Granular materials, when mixed with liquids, exhibit complex behaviors upon deposition.
  • * The formation of self-supporting structures from flowing granular suspensions is a phenomenon not fully understood.
  • * Previous studies have explored granular avalanches and fluidization, but the specific mechanics of tower formation remain less characterized.

Purpose of the Study:

  • * To investigate the formation and structural characteristics of granular towers created by dripping grain-liquid mixtures.
  • * To identify the key physical parameters governing the growth, height, and width of these granular structures.
  • * To explore how variations in impact velocity and liquid flux influence the morphology of the resulting towers.

Main Methods:

  • * Experimental observation of dense granular suspensions dripping onto an imbibing (liquid-absorbing) surface.
  • * Systematic variation of key parameters: impact velocity and the rate of grain-liquid mixture flux.
  • * Quantitative analysis of tower dimensions and morphology, correlating them with fluid dynamic parameters.

Main Results:

  • * Slender, mechanically stable structures termed 'granular towers' are formed.
  • * A balance between excess liquid flux and drainage rate determines typical tower growth and height.
  • * Tower width is correlated with the Weber number, reflecting the interplay of inertia and capillary forces.
  • * Diverse structures (symmetric, corrugated, zigzag, chiral) emerge with changes in impact velocity and flux regime.

Conclusions:

  • * Granular tower formation is a robust phenomenon driven by rapid solidification on absorbent substrates.
  • * The study provides a framework for predicting granular tower dimensions based on fluid flux and impact dynamics.
  • * Morphological diversity arises from controlling the flow regime and impact energy, offering potential for structured material design.