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Related Experiment Videos

Design and atomization properties for an inside-out type effervescent atomizer.

Frederik Jacob Petersen1, Ole Wørts, Torben Schaefer

  • 1Department of Pharmaceutics, The Danish University of Pharmaceutical Science, Copenhagen, Denmark. fjp@dfh.dk

Drug Development and Industrial Pharmacy
|April 28, 2004
PubMed
Summary

Controlling droplet size during pharmaceutical atomization is crucial. This study optimized an effervescent atomizer design, finding that exit orifice diameter and air injector placement significantly impact droplet size, especially at low air-to-liquid ratios.

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Area of Science:

  • Pharmaceutical Engineering
  • Fluid Dynamics
  • Materials Science

Background:

  • Atomization of polymer solutions is vital for pharmaceutical product formulation.
  • Precise droplet size control is essential for achieving desired product properties.

Purpose of the Study:

  • Investigate design parameters of an inside-out effervescent atomizer for aqueous polymer solutions.
  • Determine the influence of atomizer geometry and operating conditions on droplet size distribution.

Main Methods:

  • Tested an inside-out effervescent atomizer with water and polymer solutions (polyvinylpyrrolidone, hydroxypropyl methylcellulose).
  • Varied air-to-liquid mass ratios (0.1-0.5), feed pressure (1172 kPa), and fluid viscosities (1-47 mPa.s).
  • Analyzed effects of exit orifice dimensions, air injection hole area, injector-orifice distance, mixing chamber diameter, and flow orientations.

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Main Results:

  • Droplet size distributions were significantly affected by exit orifice diameter, air injector design, and injector-orifice distance.
  • Air-to-liquid mass ratio was a key factor influencing mean droplet size across all configurations.
  • Atomizer design had the most pronounced effect on mean droplet size at lower air-to-liquid mass ratios.

Conclusions:

  • Optimizing atomizer design is critical for achieving small droplet sizes in pharmaceutical processes.
  • Minimizing air/gas usage is important for specific applications like closed-cycle spray drying and agglomeration.
  • Effective control over droplet size through design enhances pharmaceutical product quality and process efficiency.