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Abstract
A numerical analysis is developed to predict friction factors and heat transfer coefficients in a pipe with irregular cross section such as that occurring in underground, pipe-type electric cable systems. The analysis employs the finite-element method, which can be easily applied to irregular geometries and nonuniform meshes. The numerical solutions substantially agree with experimental results. The value of fRe is a function of configuration. The Nusselt number is strongly dependent on the Rayleigh number and the cable configuration, both of which affect the secondary flow.