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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
Vacuum equipment, operational problems of, Vacuum operation, of reboilers, Valle, A, Valves: Vaned bends, single-phase flow and pressure drop in, Vapor blanketing, as mechanism of critical heat flux, Vapor injection, effect of on boiling heat transfer in tube bundles, Vapor-liquid disengagement, in kettle reboilers,
Thermal Design
Vapor-liquid separation, for evaporators, Vapor mixtures, condensation of, Vapor pressure, Vapor recompression, in evaporation, Vaporization, choice of evaporator type for, Vaporizer, double bundle, constructional features, Vapors, saturation properties of, Vapors, properties of superheated, Vasiliev, L, Vassilicos, J C, Velocity defect law: Velocity distribution: Velocity fluctuations, in turbulent pipe flow, Velocity ratio (slip ratio): Venting of condensers Vertical condensers: Vertical cylindrical fired heater, Vertical pipes: Vertical surfaces: Vertical thermosiphon reboilers: Vessels of non-circular cross section, design to ASME VIII code, Vessels of rectangular cross section, EN13445 guidance for, Vetere method, for enthalpy of vaporisation, Vibrated beds, heat transfer to, Vibration: Vinyl acetate: Vinyl benzene: Vinyl chloride: Virial equation: Virk equation for maximum drag reduction, Visco-elastic fluids, flow of, Viscometric functions (non-Newtonian flow), methods of determining, Viscosity: Viscosity number (Vi), Viscous dissipation, influence on heat transfer in non-Newtonian flows, Viscous heat generation, in scraped sauce heat exchangers, Viscous sublayer, in duct flow, Void fraction, Voidage, in fixed beds, definition, Volumetric heat transfer coefficient, Volumetric mass transfer coefficient, von Karman friction factor equation for fully rough surface, von Karman velocity defect law, Vortex flow, in helical coils of rectangular cross section, Vortex flow model, for twisted tube heat exchangers, Vortex shedding:

Index

HEDH
A B C D E F G H I J K L M N O P Q R S T U V
Vacuum equipment, operational problems of, Vacuum operation, of reboilers, Valle, A, Valves: Vaned bends, single-phase flow and pressure drop in, Vapor blanketing, as mechanism of critical heat flux, Vapor injection, effect of on boiling heat transfer in tube bundles, Vapor-liquid disengagement, in kettle reboilers,
Thermal Design
Vapor-liquid separation, for evaporators, Vapor mixtures, condensation of, Vapor pressure, Vapor recompression, in evaporation, Vaporization, choice of evaporator type for, Vaporizer, double bundle, constructional features, Vapors, saturation properties of, Vapors, properties of superheated, Vasiliev, L, Vassilicos, J C, Velocity defect law: Velocity distribution: Velocity fluctuations, in turbulent pipe flow, Velocity ratio (slip ratio): Venting of condensers Vertical condensers: Vertical cylindrical fired heater, Vertical pipes: Vertical surfaces: Vertical thermosiphon reboilers: Vessels of non-circular cross section, design to ASME VIII code, Vessels of rectangular cross section, EN13445 guidance for, Vetere method, for enthalpy of vaporisation, Vibrated beds, heat transfer to, Vibration: Vinyl acetate: Vinyl benzene: Vinyl chloride: Virial equation: Virk equation for maximum drag reduction, Visco-elastic fluids, flow of, Viscometric functions (non-Newtonian flow), methods of determining, Viscosity: Viscosity number (Vi), Viscous dissipation, influence on heat transfer in non-Newtonian flows, Viscous heat generation, in scraped sauce heat exchangers, Viscous sublayer, in duct flow, Void fraction, Voidage, in fixed beds, definition, Volumetric heat transfer coefficient, Volumetric mass transfer coefficient, von Karman friction factor equation for fully rough surface, von Karman velocity defect law, Vortex flow, in helical coils of rectangular cross section, Vortex flow model, for twisted tube heat exchangers, Vortex shedding:
W X Y Z
V Vapor-liquid disengagement, in kettle 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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