Library Subscription: Guest
Home Archives Officers Future meetings American Society of Thermal and Fluids Engineering
First Thermal and Fluids Engineering Summer Conference

ISSN: 2379-1748


Alireza Rasekh
Department of Flow, Heat and Combustion Mechanics, Faculty of Engineering and Architecture, Ghent University, Ghent, Belgium

Peter Sergeant
Department of Electrical Energy, Systems and Automation, Ghent University, Sint-Pietersnieuwstraat 41, 9000 Ghent, Belgium; Flanders Make vzw, Celestijnenlaan 300 – bus 4027, 3000, Leuven, Belgium

Jan Vierendeels
Department of Flow, Heat and Combustion Mechanics, Faculty of Engineering and Architecture, Ghent University, Ghent, Belgium

DOI: 10.1615/TFESC1.cmd.012791
pages 529-538

KEY WORDS: Rotor-stator system, Stator surface, Convective heat transfer, disk-type electrical machines


This work describes an analytical modeling for predicting the stator heat transfer in a discoidal system of an electrical machine. The configuration consists of a rotor-stator system surrounded by a cylindrical cover. We aim to fully predict the stator heat transfer taking into account variable parameters namely the rotational Reynolds number, the gap size ratio and the surface temperatures. In the range of 4.19×104 ≤ Re ≤ 4.19×105 and 0.00333 ≤ G ≤ 0.08, CFD simulations are implemented. Unlike the studies in the literature with the ambient temperature being considered as the reference temperature to evaluate the convective heat transfer coefficient, the average bulk temperature in the air gap is considered here. In this way, the mean Nusselt number correlation becomes of the ambient temperature. After that, a linear correlation between the bulk fluid temperature in the air gap and the surface temperature of the rotor, the stator and the cover is constructed. On the other hand, CFD simulations are carried out for different ranges of the rotational Reynolds number and the gap size ratio at various surface temperature values. Subsequently, with the aid of the least squares method together with the curve fitting procedure, the appropriate formulations for the mean Nusselt number of the stator surfaces are derived. It is found that the proposed correlation is quite versatile in predicting the convective heat transfer of the stator surface in the disk type electrical machines. The results show that there is a gap size ratio for which the average convective heat transfer for the stator facing rotor in the gap reaches a minimum.

Purchase $20.00 Check subscription Publication Ethics and Malpractice Recommend to my Librarian Bookmark this Page