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Baffle leakage in shell-and-tube heat exchangers: Baffles in shell-and-tube heat exchangers: Baker flow regime map for horizontal gas-liquid flow, Balance equation (applied to complete equipment), Band dryer: Bandel and Schlunder correlations, for boiling in horizontal tubes, Basket-type evaporator, Barbosa, J R Jr, Bateman, G, Bayonet tube heat exchangers, constructional features of, Bayonet tube evaporators, Beaton, C F, Beer-Lambert law, Bejan, A, Bell-Delaware method for shell-side heat transfer and pressure drop in shell-and-tube heat exchangers, Bell and Ghaly method for calculation of multicomponent condensation, Benard cells in free convection in horizontal fluid layers, Bends: Benzaldehyde: Benzene: Benzoic acid: Benzonitrile: Benzophenone: Benzyl alcohol: Benzyl chloride: Berenson equation for pool film boiling from a horizontal surface, Bergles, Arthur E, Bernoulli equation, application to flow across cylinders, Bimetallic tubes: Binary mixtures: Bingham fluid (non-Newtonian), Biofouling, Biot number: Biphenyl: Bismarck A, Black liquor, in pulp and paper industry, fouling of heat exchangers by, Black surface: Blackbody radiation, Blades, in scraped surface heat exchangers, Blake-Carmen-Kozeny equation, Blasius equation for friction factor, Blenkin, R, Blunt bodies, drag coefficients for, Boilers: Boiling: Boiling curve: Boiling length: Boiling number, definition, Boiling point, normal, Boiling range (in multicomponent mixtures): Boiling surface in boiling in vertical tubes, Boiling Water Reactor (BWR), fouling problems in, Bolted channel head in shell-and-tube exchanger, Bolted cone head in shell-and-tube heat exchanger, Bolted joints, thermal contact resistance in, Bolting, Bolting of flanges in shell-and-tube heat exchangers, Boltzmann's constant, Bonnet head, in shell-and-tube heat exchanger, Borishanski, V M, Borishanski correlation for nucleate pool boiling, Bott, T R, Boundary layer: Boussinesq approximations: Boussinesq number, definition, Bowring correlations for critical heat flux, Bracket supports for heat exchangers: Brauner, N, Brazed plate exchanger, Brazing in plate fin heat exchanger construction, Bricks, drying of, Brine recirculation, in multistage flash-evaporation, Brinkman number, Brittle fracture, Bromine: Bromley equation for film boiling from horizontal cylinders, Bromobenzene: Bromoethane: Bromomethane: Bromotrifluoromethane (Refrigerant 13B1): Brush and cage system, for fouling mitigation, BS 5500 code for mechanical design of shell-and-tube heat exchangers (see also PD 5500), Bubble crowding as mechanism of critical heat flux, Bubble flow: Bubbles: Bulk viscosity, Bundle-induced convection in kettle reboilers, Bundle layout, in condensers Buoyancy effects: Buoyancy-induced flow in channels, free convective heat transfer with, Busemann-Crocco integral, application in boundary layer equations, 1,2-Butadiene: 1,3-Butadiene: Butane: 1-Butanol: 2-Butanol: Butene-1: cis-2-Butene: trans-2-Butene: Butterworth, D, Butyl acetate: t-Butyl alcohol: Butylamine: Butylbenzene: n-Butylbenzene: n-Butylcyclohexane: Butylcyclopentane: Butylene oxide: Butyr-aldehyde: Butyric acid: Butyronitrile: Bypass (shell-and-tube bundle):
C D E F G H I J K L M N O P Q R S T U V W X Y Z

Boiling of Single Component Liquids: Basic Processes

DOI 10.1615/hedhme.a.000191

2.7 BOILING AND EVAPORATION
2.7.1 Boiling of single-component liquids: Basic processes

A. Vapour formation

The authors thank the United Kingdom Atomic Energy Authority (UKAEA) for permission to use Figure 191.1, Figure 191.3 and Figure 191.4, which remain UKAEA copyright material.

Figure 1 shows diagramatically the pressure-volume isotherms for a pine single-component substance. For a constant temperature T, the pressure and volume vary along a line such as ABFG. Liquid only exists along the line AB, and vapor only exists along the line FG. Liquid and vapor coexist along the line BDF. The saturation curve is the locus of points such as B and F. Corresponding values of the pressure and temperature taken from the curve BDF are known as the saturation pressure (psat) and saturation temperature (Tsat) respectively. So far, only stable equilibrium phase states have been considered. Other metastable or unstable slates can occur. For example, it is possible with care to reduce the pressure imposed on a liquid at constant temperature along a line AB without the formation of vapor at point B. Likewise, it is possible to increase the pressure imposed on a vapor along a line GF without the formation of liquid at F. The coordinates of these metastable states lie along an extrapolation of AB to C or GF to E. Points in the metastable region may also be reached by carefully increasing the liquid temperature above the saturation temperature corresponding to the imposed static pressure; this process is referred to as superheating and the metastable liquid state is referred to as superheated liquid1.

Figure 1 Pressure-volume surface for a pure substance

Vapour and liquid phases can coexist in unstable equilibrium states along lines such : is BC or FE. In this instance the pressures in the liquid and vapor in the vicinity of the interface are no longer equal at equilibrium. If the interface is concave with the center of curvature in the vapor phase, then the vapor pressure (pg) will be greater than the liquid pressure (p) by an amount given by the relationship

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