| Article ID | Journal | Published Year | Pages | File Type |
|---|---|---|---|---|
| 237324 | Powder Technology | 2012 | 5 Pages |
This study addresses a novel concept of dense-fluidized bed coating of objects where the effectiveness of coating is promoted by the intentional and controlled establishment of shear flow around the object. The fluidized powder is sheared by the controlled oscillatory motion of the object with respect to the fluidized bed. The proof-of-concept is given with experiments carried out using a commercial powder specifically manufactured for dry coating applications in fluidized bed. Systematic analysis of the effect of different levels of shear rate on particle mobility/adhesion and effectiveness of coverage was performed. A simple model has been developed to provide a mechanistic framework for the interpretation of the results.
Graphical abstractThis study addresses the novel concept that shear-flow is a mean to improve the quality of dense-fluidized bed powder coating. Shear may be induced by oscillatory motion of objects in the bed. Systematic analysis of the effect of different shear rate levels on the effectiveness of coverage was performed. A simple model representing key features of the phenomenology was developed.Figure optionsDownload full-size imageDownload as PowerPoint slideHighlights► Shear-flow is a mean to improve the quality of dense-fluidized bed powder coating. ► Shear may be conveniently induced by oscillatory motion of the object in the bed. ► The quality of coating depends on the frequency of motion in a non-monotonic way. ► A simple model representing the key features of the phenomenology was developed.
