Journal of Fluids Engineering

Volume: Page/CID:

Experimental Study of a Cavitating Centrifugal Pump During Fast Startups
The startup of rocket engine turbopumps is generally performed only in a few seconds. It implies that these pumps reach their nominal operating conditions after only a few rotations. During these firs...

Thermodynamic Effect on a Cavitating Inducer—Part I: Geometrical Similarity of Leading Edge Cavities and Cavitation Instabilities
The thermodynamic effect on a cavitating inducer is investigated from joint experiments in cold water and Refrigerant 114. The analysis is focused on leading edge cavitation and cavitation instabiliti...

J. Fluids Eng. / Volume 132 / Issue 2 / Research Papers / Multiphase Flows

Computational and Experimental Studies on Cavity Filling Process by Cold Gas Dynamic Spray

J. Fluids Eng. -- February 2010 -- Volume 132, Issue 2, 021302 (9 pages)
doi:10.1115/1.4000802

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ABSTRACT

REFERENCES (24)

Author(s):
Hidemasa Takana, Senior Assistant Professor
Institute of Fluid Science, Tohoku University, 2-1-1 Katahira, Aoba-ku, Sendai 980-8577, Japan

HongYang Li
Department of Mechanical Systems and Design, Graduate School of Engineering, Tohoku University, 6-6 Aoba, Aramaki, Aoba-ku, Sendai 980-8579, Japan

Kazuhiro Ogawa, Associate Professor
Fracture and Reliability Research Institute, Tohoku University, 6-6 Aoba, Aramaki, Aoba-ku, Sendai 980-8579, Japan

Tsunemoto Kuriyagawa, Professor
Department of Nanomechanics, Graduate School of Engineering, Tohoku University, 6-6 Aoba, Aramaki, Aoba-ku, Sendai 980-8579, Japan

Hideya Nishiyama, Professor, Mem. ASME
Institute of Fluid Science, Tohoku University, 2-1-1 Katahira, Aoba-ku, Sendai 980-8577, Japan

Time-dependentcomputational simulations on cavity filling process by cold gas dynamicspray and powder jet deposition process ranging from microscale tomacroscale were carried out in order to give an insightfor their advanced applications to joining, crack repair, and dentaltreatment. Shock wave appears in front of the substrate dueto underexpansion of jet and in-flight particles interact with theshock wave before their impact. The relation between shock wave,cavity configuration, and particle in-flight behavior in supersonic jet hasbeen discussed in detail. Based on numerical and experimental studies,it was found that when the shock wave covers upthe cylindrical cavity, the cavity cannot be filled at allby deposited powders. Moreover, under the condition of shock waveappearing inside the cylindrical cavity, conical deposition was formed dueto the secondary back flow jet along the cavity sidewall. By adopting conical cavity, cavity can be filled completelyresulting from the suppression of the secondary back flow jetalong the cavity side wall.