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A B C D E F G H I J K L M N O P Q R S T U V W X Y Z
Lamella heat exchangers, Laminar flow: Laminar flow control, of boundary layers, Lancaster, J F, Langelier index for water quality, Large eddy simulation, in prediction of turbulent boundary layers, Laws for turbulent flows: Layers of fluid, free convection heat transfer in, Le Fevre equations for free convective heat transfer, Leakage between streams, in shell-and-tube heat exchangers Leakage effects, on heat transfer and pressure drop in shell-and-tube heat exchangers, Leaks, in heat exchanger, sealing by explosive welding, Lebedev, M E, Lee and Kesler equation, for vapour pressure, L-footed fins,
Extended Surfaces and Fin Efficiency
Lessing rings, characteristic of, as packings for fixed beds, Li equation, for critical temperature of mixtures, Lienhard and Dhir analysis of critical heat flux in pool boiling, Lienhard and Eichhorn criterion, for transition in critical heat flux mechanism in crossflow over single tube, Lift force: Liley, P E, Limb, D, Limpet coils: Linnhoff, B, Liquefaction, exergy analysis of, Liquid fluidized beds, Liquid fuels, properties of, Liquid hold-up, Liquid-liquid-gas flow, Liquid-liquid flow, Liquid metals: Liquid sheets, in direct contact heat transfer, Liquid-solid interfaces, fouling at, Liquids: Lister, D H, Local conditions hypothesis, for critical heat flux in flow boiling, Lockhart and Martinelli correlations: Lodge's rubberlike liquid (non-Newtonian), Logarithmic law region, Logarithmic mean temperature difference Longitudinal flow and heat transfer in tube banks, Long-tube vertical evaporator, Loss coefficient, Lost work in unit operations/exergy analysis, Louvered fins, in plate fin exchangers, Low-alloy steels: Low-finned tubes: Low-nickel steels, Lubricants, physical properties: Lucas methods

Index

HEDH
A B C D E F G H I J K L
Lamella heat exchangers, Laminar flow: Laminar flow control, of boundary layers, Lancaster, J F, Langelier index for water quality, Large eddy simulation, in prediction of turbulent boundary layers, Laws for turbulent flows: Layers of fluid, free convection heat transfer in, Le Fevre equations for free convective heat transfer, Leakage between streams, in shell-and-tube heat exchangers Leakage effects, on heat transfer and pressure drop in shell-and-tube heat exchangers, Leaks, in heat exchanger, sealing by explosive welding, Lebedev, M E, Lee and Kesler equation, for vapour pressure, L-footed fins,
Extended Surfaces and Fin Efficiency
Lessing rings, characteristic of, as packings for fixed beds, Li equation, for critical temperature of mixtures, Lienhard and Dhir analysis of critical heat flux in pool boiling, Lienhard and Eichhorn criterion, for transition in critical heat flux mechanism in crossflow over single tube, Lift force: Liley, P E, Limb, D, Limpet coils: Linnhoff, B, Liquefaction, exergy analysis of, Liquid fluidized beds, Liquid fuels, properties of, Liquid hold-up, Liquid-liquid-gas flow, Liquid-liquid flow, Liquid metals: Liquid sheets, in direct contact heat transfer, Liquid-solid interfaces, fouling at, Liquids: Lister, D H, Local conditions hypothesis, for critical heat flux in flow boiling, Lockhart and Martinelli correlations: Lodge's rubberlike liquid (non-Newtonian), Logarithmic law region, Logarithmic mean temperature difference Longitudinal flow and heat transfer in tube banks, Long-tube vertical evaporator, Loss coefficient, Lost work in unit operations/exergy analysis, Louvered fins, in plate fin exchangers, Low-alloy steels: Low-finned tubes: Low-nickel steels, Lubricants, physical properties: Lucas methods
M N O P Q R S T U V W X Y Z
L L-footed fins,
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Extended Surfaces and Fin Efficiency

DOI 10.1615/hedhme.a.000167

2.4.9 Extended Surfaces and Fin Efficiency

Jerry Taborek

A. Introduction

Extended (fumed) surfaces are used widely in heat transfer applications. Heat transfer in such systems is by conduction from the base surface along the fin with subsequent convective heat transfer from the fin into the surrounding fluid. If the material of the fin has a very high thermal conductivity, then its surface will be at nearly uniform temperature and the heat release from the finned surface will be governed only by the heat transport phenomena between the surface and the surrounding fluid (i.e. the convective heat transfer). However, for practical systems, the conduction in the fins is of significance and the fins will be less efficient in transferring heat than would those with very high conductivity. Here we will define a fin efficiency which is the ratio of the heat-transfer rate from a given fin system to that which would occur if the fin had infinite thermal conductivity.

In this present Section, the question of fin efficiency is dealt with on the assumption that the coefficient of heat transfer from the finned surface is known. Methods for the estimation of such coefficients are given in the relevant convective heat transfer sections (for instance Section 170 for heat transfer from finned tube banks in single phase flow).

In what follows, Section B describes the operating principles of extended surfaces and Section C describes examples of the various types of extended surface which have been employed. Sections D, E and F deal with the classical, simplified and weighted fin efficiencies for single phase convection from the fins. Section G deals with fin efficiency under radiation, condensation and boiling conditions and, finally, Section H gives a brief discussion of heat transfer enhancement of the finned surfaces themselves.

B. Operational principles of extended surfaces

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