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On the design of a rotary spray former: Experimental and theoretical background
Department of Materials Processing, Royal Institute of Technology, Metals Casting Research Group, Stockholm, Sweden.ORCID iD: 0000-0002-0101-0062
1997 (English)In: Journal of Materials Processing Technology, ISSN 0924-0136, Vol. 71, no 3, 440-455 p.Article in journal (Refereed) Published
Abstract [en]

The phenomenological theory for jet stability and spray formation in centrifugal spraying is reviewed and investigated experimentally. The appropriate set of equations is then adapted to the phenomena found in the present study. The flow on the disk is treated both theoretically, as well as experimentally, leading to the possible design of a spray former. The droplet formation mechanisms are studied implicitly in the experiments, three different modes being found. A bi-modal spray is formed from the disk edge by two modes of disintegration, whilst the third mode is caused by instability at jet impact on the disk and causes a tri-modal spray. The boundary conditions for the release and flight of the droplets are treated theoretically and correlated experimentally. Water was used initially as a model material, due to the ease of direct visual observation, the knowledge acquired then being used to interpret experiments where an A17Si0.3Mg alloy is sprayed. The experimentally-obtained parameters are used in a theoretical treatment to predict the flow on the disk, i.e. the spray directions and the flight of the droplets. The general conclusion is that it is feasible to design a rotary spray former with a directed flow, the key issue being to control the jet width and the actual droplet formation at the disk edge. ©1997 Elsevier Science S.A.

Place, publisher, year, edition, pages
1997. Vol. 71, no 3, 440-455 p.
Keyword [en]
Droplets, Jet stability, Spray former, Aluminum alloys, Boundary conditions, Computational methods, Drop formation, Jets, Machine design, Powder metallurgy, Water, Rotary spray former, Spray casting, Metal casting
National Category
Materials Engineering
Identifiers
URN: urn:nbn:se:hj:diva-16660OAI: oai:DiVA.org:hj-16660DiVA: diva2:454541
Available from: 2011-11-07 Created: 2011-11-07 Last updated: 2015-06-01Bibliographically approved

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Jarfors, A. E. W.
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