An approximate estimation of velocity profiles and turbulence factor models for air-flows along the exterior of TEFC induction motors

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Journal Title
Journal ISSN
Volume Title
A1 Alkuperäisartikkeli tieteellisessä aikakauslehdessä
Date
2017
Major/Subject
Mcode
Degree programme
Language
en
Pages
13
1515-1527
Series
Thermal Science, Volume 21, issue 3
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.
Description
Keywords
Air-flow velocity profile, Empirical correlation, Steady-state heat transfer, TEFC induction motor, Turbulence factor model
Other note
Citation
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