ABSTRACT
The program CONDUCT can be used for the analysis of fully developed flow and heat transfer in ducts. This chapter discusses the main concepts and the governing equations for duct flows. In many practical applications, the length of the duct is very large in comparison with the cross-sectional dimensions. The length of the entrance region then represents only small fraction of the total duct length. The computation of the axial velocity field is mathematically identical to solving a heat conduction problem with a uniform heat generation rate. The problem reduces to a simple steady heat conduction problem in the cross section without any heat sources. The analysis of heat transfer in a duct can be treated as conduction-like problem if the streamwise convection is formally considered as a source term. If the duct wall has a high thermal conductivity, there will be peripheral conduction of heat so as to make the wall temperature uniform in a given cross section.
