1992 Volume 35 Issue 3 Pages 465-471
A U-bend coolant supply was applied to transformer windings in an attempt to equalize the flow rate in the horizontal coil ducts and to cool windings uniformly. The U-bend supply, which distributes, coolant equally, is used in heat exchangers. With the use of a two-dimensional winding model with ten coils, the velocity distribution in the horizontal ducts between each of two coils and the temperature rise distribution of the coils are measured for the U-bend supply and the Z-shaped supply (baffle plate type). Experiments prove that the cooling characteristics of the U-bend supply are superior to those of the Z-shaped supply at a low flow rate. Computational programs are developed for the U-bend and Z-shaped supplies to estimate flow and heat transfer characteristics in the windings. The programs accurately predict the velocity distribution in the coil ducts and the temperature rise distribution of the coils.
JSME international journal. Ser. 1, Solid mechanics, strength of materials
JSME international journal. Ser. A, Mechanics and material engineering
JSME International Journal Series C Mechanical Systems, Machine Elements and Manufacturing
JSME International Journal Series B Fluids and Thermal Engineering
JSME International Journal Series A Solid Mechanics and Material Engineering
JSME international journal. Ser. C, Dynamics, control, robotics, design and manufacturing
JSME international journal. Ser. 3, Vibration, control engineering, engineering for industry