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Impact01:30

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Impact occurs when two bodies collide, leading to the application of impulsive forces between them. Analyzing impact mechanics involves considering two colliding particles moving along a line known as the line of impact, which passes through their centers and is perpendicular to the contact plane.
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High Throughput Analysis of Liquid Droplet Impacts
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Simulating spray droplet impaction outcomes: comparison with experimental data.

Jerzy A Zabkiewicz1, Ravindra Pethiyagoda2, W Alison Forster3

  • 1SciCon Scientific Consultants Ltd, Rotorua, New Zealand.

Pest Management Science
|January 14, 2020
PubMed
Summary
This summary is machine-generated.

Plant spray retention models simulate retention on virtual surfaces, comparing simulations with experimental data. Models show retention mainly from recaptured shattered droplets, but predictions are lower than experimental results, indicating a need for further refinement.

Keywords:
PRSmdroplet shattersimulationspray retention

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Area of Science:

  • Agricultural Engineering
  • Physical Chemistry
  • Plant Sciences

Background:

  • Developed plant retention spray models to simulate spray retention on virtual surfaces.
  • Compared model outputs with experimental data for various spray scenarios.

Purpose of the Study:

  • To estimate the proportion of theoretical impact drop diameter at shatter (f) for the first time.
  • To compare multi-plant simulations with experimentally determined spray retention on real plants.

Main Methods:

  • Used a single formulation (0.1% v/v lecithin in water) and Chenopodium album L (common lambsquarters).
  • Conducted simulations of virtual impaction events and multi-plant scenarios with varying nozzle types and droplet sizes (VMD 241–530 μm).

Main Results:

  • Simulations indicated that impaction predominantly caused shatter, producing daughter droplets.
  • Plant retention was mainly due to the re-capture of these shattered droplets.
  • Simulated retention trends matched experimental results, but predictions were 68%–79% of experimental values.

Conclusions:

  • Spray retention results from primary drop capture and predominantly by recapture of shatter droplets.
  • The factor 'f' influences droplet shatter outcomes, affecting daughter droplet energy and quantity.
  • Discrepancies between simulated and actual results suggest possible operational influences requiring further investigation.