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Related Experiment Video

Updated: Jul 16, 2026

$Measuring Spray Droplet Size from Agricultural Nozzles Using Laser Diffraction$

Measuring Spray Droplet Size from Agricultural Nozzles Using Laser Diffraction

Published on: September 16, 2016

Composition measurements of binary mixture droplets by rainbow refractometry.

J Wilms¹, B Weigand

¹Institut für Thermodynamik der Luft- und Raumfahrt (ITLR), Universität Stuttgart, Stuttgart, Germany. wilms@itlr.de

|March 27, 2007

Summary

Rainbow refractometry now measures the composition of evaporating binary mixture droplets. This new method, using Airy theory and Mie scattering, accurately tracks droplet changes over time.

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$Measuring Spray Droplet Size from Agricultural Nozzles Using Laser Diffraction$

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Published on: May 8, 2015

Area of Science:

Physical Chemistry
Optical Physics
Droplet Dynamics

Background:

Rainbow refractometry traditionally measures droplet temperature.
Previous methods lacked the ability to track real-time composition changes in evaporating droplets.

Purpose of the Study:

To apply rainbow refractometry for the first time to measure composition histories of evaporating binary mixture droplets.
To develop and validate a novel evaluation method for this purpose.

Main Methods:

Utilized rainbow refractometry combined with Mie scattering imaging for simultaneous size and refractive index measurements.
Employed Airy theory and an empirical correction function for data analysis.
Used an optical levitation setup for extended droplet observation and numerical simulations with Lorenz-Mie theory to assess measurement uncertainty.

Main Results:

Demonstrated the accuracy of rainbow refractometry for temperature measurements of single-component droplets.
Successfully measured the size and composition histories of two different binary mixture droplets.
Experimental results showed good agreement with predictions from a rapid-mixing model.

Conclusions:

Rainbow refractometry is a viable technique for analyzing the composition evolution of evaporating binary mixture droplets.
The presented evaluation method, incorporating Airy theory and Mie scattering, provides accurate insights into droplet dynamics.
This advancement opens new avenues for studying multiphase systems and evaporation processes.