Experimental Study of Drag Resistance Using a Laboratory Scale Rotary Set-up
2003; Taylor & Francis; Volume: 19; Issue: sup1 Linguagem: Inglês
10.1080/0892701031000072118
ISSN1029-2454
AutoresClaus Erik Weinell, Kenneth Nørager Olsen, Martin W. Christoffersen, Søren Kiil,
Tópico(s)Granular flow and fluidized beds
ResumoThis work covers an experimental study of the drag resistance of different painted surfaces and simulated large-scale irregularities, viz. dry spraying, weld seams, barnacle fouling and paint remains. A laboratory scale rotary set-up was used to determine the drag resistance, and the surface roughness of the samples was determined by means of two different stylus-based methods, one having a 1.6 mm ball stylus (giving the macro-roughness) and the other having a needle type stylus (giving the micro-roughness). It is demonstrated that, in the case of ideal painted surfaces (low macro-roughness), the micro-roughness is much more important than the macro-roughness. On the other hand, the study also indicates that larger scale irregularities have a much greater influence on the drag resistance compared to measurements of the paint system alone.
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