Factors that Affect the Size Distribution of Nebulized Fluid
Public Deposited- Last Modified
- February 28, 2019
- Creator
-
Anthony, Theresa Renee
- Affiliation: Gillings School of Global Public Health, Department of Environmental Sciences and Engineering
- Abstract
- A test nebulizer was developed to evaluate the effect of altering nebulizer geometry and flow conditions upon the size distribution of the droplets produced. An Andersen impactor was used to collect the dried residual particles of a methylene blue dye and sodium bicarbonate solution. Residual particle mass was determined by colorimetric analysis in a spectrophotometer. Droplet size distributions were calculated from the amount of methylene blue dye collected on each impactor stage, the cut sizes of the Andersen impactor, the nebulized solution's concentration, and the residual particles' density. The effects of air velocity, liquid velocity, air nozzle diameter, and nebulizer baffle position on droplet size distribution were evaluated. Linear regression was used to develop an empirical relationship between key parameters and the mass median droplet diameter, d50, as well as d16 and d84. The model indicates that the median diameter increases from 9 to 22 μm with decreased kinetic energy loss, decreased air nozzle exit area and, surprisingly, decreased distance separating the baffle and air nozzle.
- Date of publication
- May 1992
- DOI
- Resource type
- Rights statement
- In Copyright
- Advisor
- Symons, Michael J.
- Leith, David
- Reist, Parker C.
- Degree
- Master of Science in Environmental Engineering
- Academic concentration
- Industrial Hygiene
- Degree granting institution
- University of North Carolina at Chapel Hill
- Graduation year
- 1992
- Language
- Deposit record
- c2589085-57f7-4434-bf45-a2666ba162b9
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