Abstract
Chapter 5 introduces a new approach for books on heat exchangers, in the form of a detailed development of the boundary layer equations in laminar flow. It is argued that an understanding of the fundamental processes is essential for both the sensible utilisation and the future development of compact surfaces. The traditional Blasius and approximate power law solutions for velocity and thermal boundary layers are given, with the corresponding Prandtl number dependence for the latter. The resultant relationships for strip surfaces, in terms of length-dependent Nusselt numbers and skin friction, are then compared with the results from both direct numerical simulations (DNS) and experiments (Kays and London data). An interpretation of the latter is given, taking into account the number of ‘rows’ of offset strip fins. Analytical results are also developed for normal flow over wedges and cylinders. Finally, an outline of possible approaches to designed-in, three-dimensional flow surfaces is given.
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