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ICLASS 94<br>Proceedings of the Sixth International Conference on Liquid Atomization and Spray Systems

ISBN:
978-1-56700-019-1 (Print)
978-1-56700-445-5 (Online)

EVOLUATION OF THE PERFORMANCES OF AN AEROSOL DELIVERY EQUIPMENT SUITABLE FOR CALVES UNDER DIFFERENT CONDITIONS

B. Genicot
Faculty of Veterinary Medicine, University of Liege, Belgium

M. Peckova
University of Washington, Seattle, USA

P. Lambert
Facultu of Economics, University of Liege, Belgium

J.K. Lindsey
Facultu of Economics, University of Liege, Belgium

R. Close
Faculty of Veterinary Medicine, University of Liege, Belgium

P. Lekeux
Faculty of Veterinary Medicine, University of Liege, Belgium

Abstract

Aerosol delivery equipment, suitable for the treatment of bovine respiratory dysfunctions and including two parallelly positioned jet nebulizers, was studied in depth in order to determine the optimal working conditions in the field. Indeed, some factors might reasonably alter the performance of this equipment. Among those factors, the influence of the parallel position of the jet nebulizers (in order to accomodate the breathing requirements of the cattle and to achieve a quick treatment), of the long feed pipe delivering compressed air (in order to keep the animal away from the compressor unit), and finally of the ambient temperature were studied, this equipment being essentially used during the winter season. It has been shown that this equipment is able to accomodate the breathing needs of bovine weighing up to 225 kg if a pressure of 600 kPa is developed upstream to the nebulizers. That pressure provides the highest proportion of particles with a diameter less than 5 µm. The rate of atomization is significantly reduced when working at ambient air temperatures (272.25 K < T < 274.65 K) close to those encountered in winter. This is especially true when pressure upstream to the nebulizers does not reach 500 kPa. Finally, the residual volume is significantly decreased when the feed pipe for compressed air is immersed in hot water and the rate of atomization significantly increased when the face mask including the nebulizers is maintained so that the nebulizers are in a vertical position or at an angle not less than 60° with respect to the ground.