Abstract
Natural convection flow is very important in practical applications. For example, the flow inside an electric transformer has not been investigated completely. The heat generated by electrical coils inside a transformer has to be cooled by natural or forced convection. As a practical application, the flow inside an electric transformer is simulated by using two workstations. There are many electrical coils inside it, which generate Joule's heat. To cool this heat, oil is usually forced to flow through coils. However, oil is flammable and, furthermore, forced convection needs a driving force. As an alternative, it is possible to use a nonflammable gas by using natural convection. When the flow reaches the top of the coil section, it goes into the cold section, where the heat is given to the cold wall and then the flow goes down in the cold section. The temperature rises in the upper region in both the coil and flow sections. From simulation, useful information is obtained such as the optimum arrangement of flow passages inside an electric transformer, which can be used to design it.
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