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Nahme-Griffith number, Nakashima, CY Nanoparticles, for heat transfer augmentation, Naphthalene: Napthenes: National practice, in mechanical design, guide to, Natural convection: Natural draft cooling towers: Natural frequency of tube vibration in heat exchangers, Navier-Stokes equation, Neon: Neopentane: Net free area, in double-pipe heat exchangers, Netherlands, guide to national mechanical design practice, Networks, of heat exchangers, pinch analysis method for design of, Neumann boundary conditions, finite difference method, Nickel, thermal and mechanical properties Nickel alloys, Nickel steels, Niessen, R, Nitric oxide: Nitriles: Nitrobenzene: Nitro derivatives: Nitroethane: Nitrogen: Nitrogen dioxide: Nitrogen peroxide: Nitromethane: m-Nitrotoluene: Nitrous oxide Noise: Nonadecane: Nonadecene: Nonane: Nonene: Nonanol: Nonaqueous fluids, critical heat flux in, Non-circular microchannels: Noncondensables:
in boiling, in condensation
General Introduction Condensation of Vapour Mixtures Condensation of Vapour Mixtures Forming Immicible Liquids Dropwise Condensation
Nondestructive testing, of heat exchangers Nongray media, interaction phenomena with, Nonmetallic materials: Non-Newtonian flow: Nonparticipating media, radiation interaction in, Nonuniform heat flux, critical heat flux with, Non-wetting surfaces, in condensation augmentation, North, C, No-tubes-in-window shells, calculation of heat transfer and pressure drop in, Nozzles: Nowell, D G, Nucleate boiling: Nuclear industry, fouling problems in, Nucleation: Nucleation sites: Nuclei, formation in supersaturated vapor, Number of transfer units (NTU): Numerical methods: Nusselt: Nusselt-Graetz problem, in laminar heat transfer in ducts, Nusselt number:

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HEDH
A B C D E F G H I J K L M N
Nahme-Griffith number, Nakashima, CY Nanoparticles, for heat transfer augmentation, Naphthalene: Napthenes: National practice, in mechanical design, guide to, Natural convection: Natural draft cooling towers: Natural frequency of tube vibration in heat exchangers, Navier-Stokes equation, Neon: Neopentane: Net free area, in double-pipe heat exchangers, Netherlands, guide to national mechanical design practice, Networks, of heat exchangers, pinch analysis method for design of, Neumann boundary conditions, finite difference method, Nickel, thermal and mechanical properties Nickel alloys, Nickel steels, Niessen, R, Nitric oxide: Nitriles: Nitrobenzene: Nitro derivatives: Nitroethane: Nitrogen: Nitrogen dioxide: Nitrogen peroxide: Nitromethane: m-Nitrotoluene: Nitrous oxide Noise: Nonadecane: Nonadecene: Nonane: Nonene: Nonanol: Nonaqueous fluids, critical heat flux in, Non-circular microchannels: Noncondensables:
in boiling, in condensation
General Introduction Condensation of Vapour Mixtures Condensation of Vapour Mixtures Forming Immicible Liquids Dropwise Condensation
Nondestructive testing, of heat exchangers Nongray media, interaction phenomena with, Nonmetallic materials: Non-Newtonian flow: Nonparticipating media, radiation interaction in, Nonuniform heat flux, critical heat flux with, Non-wetting surfaces, in condensation augmentation, North, C, No-tubes-in-window shells, calculation of heat transfer and pressure drop in, Nozzles: Nowell, D G, Nucleate boiling: Nuclear industry, fouling problems in, Nucleation: Nucleation sites: Nuclei, formation in supersaturated vapor, Number of transfer units (NTU): Numerical methods: Nusselt: Nusselt-Graetz problem, in laminar heat transfer in ducts, Nusselt number:
O P Q R S T U V W X Y Z
N Noncondensables: in condensation
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Condensation of Vapour Mixtures

DOI 10.1615/hedhme.a.000186

2.6 CONDENSATION
2.6.3 Condensation of Vapour Mixtures

David R. Webb

A. Introduction

The author would like to acknowledge the frequent use he has made of the previous article by D. Butterworth in HEDH in 1983. His material has been expanded to include many important developments in the understanding of mixed vapour condensation.

Over this period ever increasing reliance has been placed on proprietary, computerised design and rating programs. This being so, it is more necessary than ever for the design engineer to have a good understanding of the condensation process and the limitations of the design methods available to him.

Mixture condensation differs from pure vapour condensation in two ways. Firstly the temperature of the condensing process changes through the condenser, and secondly, mass transfer effects are introduced in addition to those of heat transfer.

Figure 1 shows a typical condensation, or cooling curve, for a mixture of vapours. It is a plot of saturation, or dew temperature, Tg*, against specific enthalpy, h, and gives an approximation to the path followed by a condensation process through a condenser, (Section B).

, coolant temperature and pressure, , described in Section C(d). The formulation of the latter equation is outside the scope of this section but pressure drop is considered in for tubes and for shellside flow in tubular exchangers.

at = .

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