Abstract
This chapter discusses concentric annular ducts for laminar flow. The concentric circular annular duct is an important geometry for many fluid flow and heat transfer devices. The simplest form of a two-fluid heat exchanger is a double pipe made up of two concentric circular tubes. One fluid flows through the inside tube, while the other fluid flows through the annular passage. The chapter presents the analysis of the heat transfer and fluid friction problems for developing and developed profiles for a variety of boundary conditions for both the circular tube and concentric annular duct. Depending upon the temperature or heat flux specified at the inner and outer surfaces of the annulus, there are four possible fundamental boundary conditions. For each kind of fundamental boundary condition, there are two solutions of the energy equation, one for each of the two surfaces heated, thus totaling eight heat transfer solutions. The fundamental boundary conditions of the fourth and fifth kinds are identical for concentric annular ducts heated symmetrically around each periphery.
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