Campus Units

Chemical and Biological Engineering, Mechanical Engineering

Document Type

Article

Publication Version

Accepted Manuscript

Publication Date

2018

Journal or Book Title

Atomization and Sprays

Volume

28

Issue

11

First Page

1029

Last Page

1059

DOI

10.1615/AtomizSpr.2019028797

Abstract

Liquid sprays play a key role in many engineering processes, including, but not limited to, food processing, coating and painting, 3D printing, fire suppression, agricultural production, and combustion systems. Spray characteristics can easily be assessed in the mid- and far-field regions, well after liquid sheet breakup and droplet formation, using various optical and/or laser diagnostic techniques. The conditions in the near-field region influence mid- and far-field characteristics; however, near-field measurements are extremely challenging because the spray in this region is typically optically dense where optical and laser diagnostics are generally ineffective. This paper provides an overview of the various X-ray imaging techniques that can be used to characterize the near-field region of a spray. X-rays produced with tube sources as well as synchrotron sources will be discussed. Using tube-source X-rays, 2D radiographic videos are possible showing qualitative spray information. The 2D radiographs can also provide quantitative measurements of the optical depth (OD) in the near-field region. Tube sources can also provide X-ray computed tomography imaging that can produce time-average 3D density (mass distribution) maps of the spray. X-rays from synchrotron radiation provide a high-flux X-ray beam that can be used to provide high spatial and temporal resolution of the spray equivalent path length (EPL) as well as other characteristics, but it is more challenging to implement than using a common tube source. Various examples of these X-ray imaging techniques will be discussed.

Comments

This is a manuscript of an article published as Heindel, Theodore. "X-ray Imaging Techniques to Quantify Spray Characteristics in the Near Field." Atomization and Sprays 28, no. 11 (2018): 1029-1059. DOI: 10.1615/AtomizSpr.2019028797. Posted with permission.

Copyright Owner

Begell House, Inc.

Language

en

File Format

application/pdf

Published Version

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