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The influence of surface roughness on the flow fields generated by an oscillating cantilever

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Show simple item record Conway, Ciaran Punch, Jeff 2018-08-01T08:58:31Z 2018-08-01T08:58:31Z 2018
dc.description peer-reviewed en_US
dc.description.abstract With the current trend of miniaturisation of electronic devices, piezoelectric fans have attracted increasing interest as a means of inducing forced convection cooling, instead of traditional rotary solutions. Although there exists an abundance of research on various piezo-actuated flapping fans in the literature, the geometries of these fans all consist of a smooth rectangular cross section with thicknesses typically of the order of 100 μm. The focus of these studies has primarily been on variables such as frequency, amplitude and, in some cases, resonance mode. It is generally noted that the induced flow dynamics are a direct consequence of the pressure differential at the fan tip as well as the pressure driven ‘over the top’ vortices generated at the upper and lower edges of the fan. Rough surfaces such as golf ball dimples or vortex generators on an aircraft wing have proven to be beneficial by tripping the boundary layer and energising the adjacent airflow. This paper aims to examine the influence of surface roughness on the airflow generation of a flapping fan, and to determine if the induced wake can be manipulated or enhanced by energising the airflow around the fan tip. Particle-Image Velocimetry (PIV) is carried out on mechanically oscillated rigid fans with surfaces consisting of protruding pillars and dimples. A smooth rigid fan surface is also investigated as a control. No significant difference was noted between the smooth and roughened fans through observation of the induced flow fields. Both fans produced results that were largely consistent with the existing literature on oscillating cantilevers. The results of this paper may be used to inform the design of piezoelectric fans and to aid in understanding the complex aerodynamics inherent in flapping wing flight. en_US
dc.language.iso eng en_US
dc.publisher EDP Sciences en_US
dc.relation.ispartofseries EPJ Web of Conferences;180, 02017
dc.subject miniaturisation of electronic devices en_US
dc.subject piezoelectric fans en_US
dc.subject inducing forced convection cooling en_US
dc.subject frequency en_US
dc.subject amplitude en_US
dc.subject surface roughness en_US
dc.subject resonance mode en_US
dc.subject flapping wing flight en_US
dc.title The influence of surface roughness on the flow fields generated by an oscillating cantilever en_US
dc.type info:eu-repo/semantics/conferenceObject en_US
dc.type.supercollection all_ul_research en_US
dc.type.supercollection ul_published_reviewed en_US
dc.identifier.doi 10.1051/epjconf/201818002017
dc.contributor.sponsor IRC en_US
dc.relation.projectid GOIP/2014/1480 en_US
dc.rights.accessrights info:eu-repo/semantics/openAccess en_US

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