A CFD Study of the Effect of a Surface Roughness on Heat Transfer in a Clearance and Cooling Fins of an Electric Motor

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dc.contributor Aalto-yliopisto fi
dc.contributor Aalto University en
dc.contributor.author Ala-Juusela, Juhaveikko
dc.date.accessioned 2016-12-13T10:02:42Z
dc.date.available 2016-12-13T10:02:42Z
dc.date.issued 2004
dc.identifier.uri https://aaltodoc.aalto.fi/handle/123456789/23730
dc.description MEMO No CFD/THERMO-47-2004 Date: 4th March 2004
dc.description.abstract Abstract: The effect of a surface roughness on heat transfer is studied in two electric-motor-related cases. A flow in a clearance and between the cooling fins of the ABB HXR 400L electric motor is simulated numerically. The clearance is simplified to a two dimensional slot and, therefore, the calculation is not valid in the ends of the rotor. Furthermore, the clearance is modelled utilizing symmetry and only a sector of 30◦ is modelled. The air flow around the cooling fins is modelled by calculating one fin space and its surroundings. FINFLO flow solver, developed at Helsinki University of Technology, is used in the simulations. For the turbulence modelling k-ω model is utilized. Main result: A surface sand-roughness of 46 µm is used in a case of the clearance of an electric motor. The improvement of the equivalent conductivity is 0.4 % with open key slots and 4 % with filled key slots. A surface roughness of 1.5 µm has no effect on the heat transfer coefficient in a flow around the cooling fins while a roughness of 260 µm improves heat transfer coefficient by 1.8 %. en
dc.format.extent 29
dc.format.mimetype application/pdf en
dc.language.iso en en
dc.publisher Aalto University en
dc.publisher Aalto-yliopisto fi
dc.subject.other Mechanical engineering en
dc.title A CFD Study of the Effect of a Surface Roughness on Heat Transfer in a Clearance and Cooling Fins of an Electric Motor en
dc.type J Muu elektroninen julkaisu fi
dc.contributor.school Teknillinen korkeakoulu fi
dc.contributor.school Helsinki University of Technology en
dc.contributor.department Sovelletun termodynamiikan laboratorio fi
dc.contributor.department Laboratory of Applied Thermodynamics en
dc.subject.keyword FINFLO en
dc.subject.keyword k-ω-model en
dc.subject.keyword electric motor en
dc.subject.keyword clearance en
dc.subject.keyword cooling fin en
dc.subject.keyword surface roughness en
dc.identifier.urn URN:NBN:fi:aalto-201612135911
dc.type.dcmitype text en


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