Estudo fluidodinâmico computacional da transferência de calor de uma conexão elétrica tipo H

Abstract

All energy that is generated, transmitted and distributed requires electricity to pass by electrical connections at various points. The ever-increasing demands for electricity and the shortage of new economically viable generation sources, presenting projects distant from consumers connected by long power transmission lines makes the study of power connections important. The operations, product quality, and equipment reliability, availability, and maintainability are now pushed to unprecedented levels while staying within budgetary constraints. One of the most visible ways of perceiving the state of degradation of a power connection is it high temperature. This dissertation presents the study of an "H" type compression power connection heat transfer, commonly used in power distribution systems, in order to study the heat transfer in quiescent state and in the presence of crossow. A computational uids dynamics (CFD) numerical simulation is performed and validated by comparing with obtained experimental data. Then it is studied the streamlines, the pressure variation and the local and average convection heat transfer coecient, in steady and unsteady state. Finally, local and average Nusselt number correlations for this connection are described. The temperature results obtained by numerical simulation were close to those obtained experimentally, with the maximum deviation of 6%. Themean convection heat transfer coecient met similar values when compared with the classical correlations for a cylinder of equivalent diameter, and the maximum difference found is 19%.