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Thermal Design
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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,
Thermal Design
in evaporators, in forced convective boiling of binary and multicomponent mixtures, 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 axial flow reboilers,
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Thermal Design

DOI 10.1615/hedhme.a.000278

3.6.2 Thermal design

J. W. Palen

A. Kettle, internal, and horizontal thermosiphon reboilers

Kettle, internal, and horizontal thermosiphon reboilers are similar in that heat is transferred to a vaporizing two-phase mixture flowing across a tube bundle. Nucleate and convective boiling mechanisms both take part in the boiling process. For kettle reboilers, convective circulation takes place in an enlarged shell with mostly vapor going overhead. For the thermosiphon, a two-phase mixture is discharged from the reboiler and convective circulation involves the external piping and liquid reservoir. Nevertheless, the heat transfer processes are essentially the same in both types, so thermal design is covered in the same section. The following elements are important.

(a) Single-tube nucleate boiling

The nucleate boiling mechanism has considerable influence on the behavior of kettle and horizontal thermosiphon reboilers, so a correlation for nucleate boiling on single tubes is a necessary (but not sufficient) component of the design calculations For a more detailed discussion of nucleate boiling theory, refer to Section 2.7.2.

The nucleate boiling heat transfer coefficient can be described by either of the two following forms, both of which may be convenient in different types of calculations:

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