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Boiling of Binary and Multicomponent Mixtures: Forced Convection Boiling
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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: 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:
augmentation of, in axial flow reboilers, in evaporators, in forced convective boiling of binary and multicomponent mixtures,
Boiling of Binary and Multicomponent Mixtures: Forced Convection Boiling
in forced convective heat transfer in vertical tubes, in horizontal tubes, in kettle reboilers, in microchannels, outside tubes and tube bundles in crossflow, in pool boiling of binary and multicomponent mixtures, in pool boiling systems,
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 Nucleate boiling: in forced convective boiling of binary and multicomponent mixtures,
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Boiling of Binary and Multicomponent Mixtures: Forced Convection Boiling

DOI 10.1615/hedhme.a.000198

2.7 BOILING AND EVAPORATION
2.7.8 Boiling of binary and multicomponent mixtures: Forced convection boiling

J. G. Collier and G. F. Hewitt

The published literature on forced convection vaporization of mixtures is much more limited than that for pool boiling of mixtures. However, there is growing interest in the subject and useful reviews are given by Collier and Thome (1994), Fujita and Tsutsui (1997), Carey (1992) and Kandlbinder (1997). One of the earliest published studies is that of McAdams et al. (1942), who in 1940 carried out experiments using a four-pass horizontal-tube evaporator heated by steam. Each pass had three separate steam jackets to allow the local heat flux to be measured. The fluid was a benzene-oil mixture. Bulk fluid temperatures were found to increase throughout the saturated boiling length as the liquid became richer in oil. Thus, some of the heat transferred to the liquid was retained in the form of sensible heat to maintain the fluid at saturation conditions and was not available for evaporation. Average boiling heat transfer coefficients were calculated for each pass where boiling occurred in all three jackets. At a given vapor mass quality, the coefficient decreased as the oil content of the feed increased.

A number of workers [Bonnet and Gerster (1951); Shellene et al. (1968)] have studied the performance of complete reboilers. but such studies cannot provide information on the local conditions in the evaporating stream.

A. Saturated nucleate boiling

Saturated nucleate boiling will be influenced by the addition of a second component in the same qualitative manner as nucleate pool boiling (Section 197). Thus, where the heat transfer is dominated by nucleate boiling, reductions in the heat transfer coefficient may occur, as in the case of pool boiling, and can be estimated using the methodologies described in Section 197. Results in this category include those of Müller-Steinhagen and Jamialahmadi (1996), Fujita and Tsutsui (1996), Celata et al. (1996) and Steiner (1996). Typical results of this kind are shown in Figure 1.

Figure 1 Variation of heat transfer coefficient with composition in forced convective boiling of R134a/R123 mixtures (Fujita and Tsutsui, 1996)

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