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An approximate estimation of velocity profiles and turbulence factor models for air-flows along the exterior of TEFC induction motors
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A1 Alkuperäisartikkeli tieteellisessä aikakauslehdessä
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en
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13
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Thermal Science, Volume 21, issue 3, pp. 1515-1527
Abstract
Compared to a number of other existing correlations for heat transfer, the empirical correlations for forced convection from a short horizontal cylinder in axial air-flows usually do not involve the effects of changes in air-flow velocity and/or air-flow turbulence. Therefore, a common analysis of the heat transfer by using only one energy balance equation for entire outer surface of a solid is considered insufficient for induction motor applications because it fails to include aforementioned effects. This paper presents a novel, empirically-based methodology to estimate approximately the values of air-flow velocities and turbulence factors, that is, velocity profiles and turbulence factor models for stationary horizontal cylinders with and without fins (frame and two end-shields) in axial air-flows. These velocity profiles and turbulence factor models can then be used in analytical modelling of steady-state heat transfer from the exterior of totally enclosed fan-cooled induction motors.
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Klimenta, D O & Hannukainen, A 2017, 'An approximate estimation of velocity profiles and turbulence factor models for air-flows along the exterior of TEFC induction motors', Thermal Science, vol. 21, no. 3, pp. 1515-1527. https://doi.org/10.2298/TSCI150626090K