Extended Surface Conjugate Heat Transfer

Introduction to heat transfer and extended surfaces: pioneering work of Harper and Brown/Gardner/Jacob; fundamentals of heat transfer; mathematical representation of heat flow across interfaces; concept of thermal resistances and controlling resistance leading to why the use of fins; common fin performance indicators - fin effectiveness, efficiency, surface enhancement and fin assembly augmentation; the process heat transfer design problem. One-dimensional fins and assemblies: Derivation of governing equations, boundary conditions and assumptions, isolated single fins; single fin attached to the primary surface and the introduction of the surface enhancement and the augmentation of the surface; assembly augmentation; non-uniform heat transfer co-efficient; free and mixed convection from a downward facing fin; radiation from the surfaces of fins, further consideration of the assumption with respect to one-dimensional heat flow through the assembly and fins. Two-dimensional fins and assemblies: Derivation of governing equations, boundary conditions and assumptions; various geometries; the conjugate problem; mathematical methods; augmentation of assemblies. Important physical effects associated with two-dimensional fins and assemblies: Rectangular and cylindrical fins; convection - uniform and non-uniform coefficients, Radiation from the surfaces of the fins and primary surface; convection and radiation; perfect contact; temperature dependent physical properties, conductivity, heat transfer coefficient; application of augmentation factors to specific fin assemblies; axial conduction in longitudinal finned tubes. Transient heat transfer in one-dimensional fins and assemblies: Equations, boundary conditions and assumptions; augmentation; the isolated fin; the fin assembly; general periodic heating and cooling of fin assemblies. Two-dimensional transient heat transfer in two-dimensional fins and assemblies: Equation boundary conditions and assumptions; methods of solution; augmentation; isolated fins with various periodic heating and cooling, the fin assembly, general periodic heating and cooling of the system. Aspects of design using the one-dimensional and two-dimensional analysis of fin assemblies: Optimisation of fin assemblies; discussion of augmentation devices for both sides of a primary surface; what to do next.