The syringe in a subcutaneous auto-injector may be subjected to internal pressure transients due to the normal operation of the injection mechanism. These transients are similar to transients in fluid-filled pipelines observed during water hammer events. In this paper, the effect of an air gap in the syringe and a converging section is studied experimentally and numerically in a model system which consists of a fluid-filled metal tube that is impulsively loaded with a projectile to simulate the action of the auto-injector mechanism operation. The air between the buffer and the water results in a complex interaction between the projectile and the buffer. Also, there are tension waves inside the tube due to the presence of a free surface and the motion of the buffer, and this causes distributed cavitation which, in turn, gives rise to steepening of the pressure waves. The converging section can amplify the pressure waves if the wave front is sharp, and it can enhance the collapse of bubbles. Pressures as high as 50 MPa have been measured at the apex of the cone with impact velocities of 5.5 m/s.
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April 2019
Research-Article
Impulsive Motion in a Cylindrical Fluid-Filled Tube Terminated by a Converging Section
Jean-Christophe Veilleux,
Jean-Christophe Veilleux
Aerospace Laboratories,
California Institute of Technology,
Pasadena, CA 91125
e-mail: jc.veilleux@caltech.edu
California Institute of Technology,
Pasadena, CA 91125
e-mail: jc.veilleux@caltech.edu
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Joseph E. Shepherd
Joseph E. Shepherd
Aerospace Laboratories,
California Institute of Technology,
Pasadena, CA 91125
e-mail: joseph.e.shepherd@caltech.edu
California Institute of Technology,
Pasadena, CA 91125
e-mail: joseph.e.shepherd@caltech.edu
Search for other works by this author on:
Jean-Christophe Veilleux
Aerospace Laboratories,
California Institute of Technology,
Pasadena, CA 91125
e-mail: jc.veilleux@caltech.edu
California Institute of Technology,
Pasadena, CA 91125
e-mail: jc.veilleux@caltech.edu
Joseph E. Shepherd
Aerospace Laboratories,
California Institute of Technology,
Pasadena, CA 91125
e-mail: joseph.e.shepherd@caltech.edu
California Institute of Technology,
Pasadena, CA 91125
e-mail: joseph.e.shepherd@caltech.edu
Contributed by the Pressure Vessel and Piping Division of ASME for publication in the JOURNAL OF PRESSURE VESSEL TECHNOLOGY. Manuscript received October 19, 2018; final manuscript received February 5, 2019; published online February 25, 2019. Assoc. Editor: Marwan A. Hassan.
J. Pressure Vessel Technol. Apr 2019, 141(2): 021302 (11 pages)
Published Online: February 25, 2019
Article history
Received:
October 19, 2018
Revised:
February 5, 2019
Citation
Veilleux, J., and Shepherd, J. E. (February 25, 2019). "Impulsive Motion in a Cylindrical Fluid-Filled Tube Terminated by a Converging Section." ASME. J. Pressure Vessel Technol. April 2019; 141(2): 021302. https://doi.org/10.1115/1.4042799
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