Welcome to the von Karman Institute for Fluid Dynamics Store

Rainbow thermometry development and application to evaporation and diffusion processes

Be the first to review this product

Availability: In stock

€25.00
OR

Quick Overview

VKI PHDT 2007-01, Rainbow thermometry development and application to evaporation and diffusion processes, ISBN 2-930389-20-6

Rainbow thermometry development and application to evaporation a

Double click on above image to view full picture

Zoom Out
Zoom In

More Views

  • Rainbow thermometry development and application to evaporation a
  • Rainbow thermometry development and application to evaporation a

Details

Rainbow thermometry development and application to evaporation and diffusion processes
By Maria Rosaria Vetrano, published in 2006, ISBN 2-930389-20-6
PhD Thesis from the von Karman Institute/ Université Libre de Bruxelles, Belgium, Octobre 2006
Abstract

Light scattering by small particles is the physical phenomenon that produces the natural rainbow in the sky. The same phenomenon can be reproduced in laboratory with monochromatic light giving rise to non-intrusive laser based techniques for the measurement of size and refractive index of particles suspended in a medium possessing lower refractive index. These techniques are commonly called ”Rainbow Thermometry” techniques and appear at the beginning of the nineties. The measurement of size and refractive index of the particles is obtained through the analysis of the interference fringe image generated in the far field by means of the interaction between the laser light and the particles themselves. The work presented in this thesis has as objective the improvement of the Rainbow Techniques both on the theoretical aspects and the application.

In this thesis the Airy theory, which is used as theoretical model for the Standard Rainbow Thermometry, has been improved to minimize the discrepancies it was presenting respect to more complex and complete theories and it has been generalized to spherical particles presenting a spherically symmetric refractive index gradient. This generalized model has been used to evaluate the size and temperature of a n-octane burning droplet in standard atmosphere with good results. The generalization of the Standard Rainbow Thermometry to multiple particles, Global Rainbow Thermometry, is presented both theoretically and experimentally and the role of the particle asphericity in the light scattered intensity is evaluated.

Two experimental application of the Global Rainbow Thermometry are reported. The first one concerns the measurement of size and refractive index of silicon oil droplets suspended in an aqueous bulk. This experiment allows the Global Rainbow Thermometry validation through the comparison with measurements simultaneously obtained with well known experimental techniques as Back-Light scattering and thermocouple measurement with satisfactory results. The second experiment concerns Global Rainbow Thermometry measurement performed on an evaporating flat-fan water spray. The results obtained, both for temperature and for size, are in satisfactory agreement with predictions already done by other authors and with numerical simulations performed by the engineering code CASIMIRE.

Additional Information

Manufacturer von Karman Institute for Fluid Dynamics

Product Tags

Use spaces to separate tags. Use single quotes (') for phrases.