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F-correction method:
F-factor charts and equations for various heat exchanger configurations,
F-factor method:
F-type shells:
Fabrication:
Failure modes of heat exchangers,
Falling films, direct contact heat transfer in,
Falling film evaporator:
Fanno flow,
Fans in air-cooled heat exchangers:
Fatigue as failure mode of a heat exchanger
Fatigue life, of expansion bellows,
Fawcett, R
Fedor's method, for critical temperature,
Fenghour, A
Ferritic stainless steels, as material of construction,
Fick's law for diffusion,
Film boiling:
Film model, condenser design by
Film temperature, definition of for turbulent flow over flat plate,
Films in heat exchangers,
Filmwise condensation:
Fincotherm, heat transfer medium,
Finite-difference equations:
Finite difference methods:
Finite-element methods:
Fins (see also Extended surfaces):
Fire-tube boiler,
Fired heaters,
Fires, room, radiation interaction phenomena in,
Firsova, E V,
Fixed beds:
Fixed tubesheet, shell-and-tube exchangers:
Flanges, mechanical design of in heat exchangers,
Flash evaporation
Flat absorber of thermal radiation,
Flat heads:
Flat plate:
Flat reflector of thermal radiation,
Floating head designs for shell-and-tube heat exchangers:
Flooded type evaporator, in refrigeration,
Flooding phenomena:
Flow distribution:
Flow-induced vibration,
Flow regimes:
Flow stream analysis method for segmentally baffled shell and tube heat exchangers,
Flue gases, fouling by,
Fluid elastic instability as source of flow-induced vibration,
Fluid flow, lost work in,
Fluid mechanics, Eulerian formulation for,
Fluid-to-particle heat transfer in fluidized beds,
Fluidized bed dryer:
Fluidized bed gravity conveyors,
Fluidized beds:
Fluids:
Fluorine:
Fluorobenzene:
Fluoroethane (Refrigerant 161):
Fluoromethane (Refrigerant 41):
Fluted tubes:
Flux method, for modeling radiation in furnaces,
Flux relationships in heat exchangers,
Fogging in condensation
Food processing, fouling of heat exchangers in,
Forced flow reboilers:
Formaldehyde:
Formamide:
Formic acid:
Forster and Zuber correlation for nucleate boiling,
Fouling,
Foam systems, heat transfer in,
Four phase flows, examples,
Fourier law for conduction
Fourier number (Fo):
Frames for plate heat exchangers,
France, guide to national practice for mechanical design,
Free convection:
Free-fall velocity, of particles,
Free-stream turbulence, effect on flow over cylinders,
Freeze protection of air-cooled heat exchangers,
Freezing, of condensate in condensers
Fresnel relations in reflection of radiation,
Fretting corrosion,
Friction factor:
Friction multipliers in gas-liquid flow:
Friction velocity, definition,
Friedel correlation for frictional pressure gradient in straight channels,
Froude number:
Fuels, properties of,
Fuller, R K,
Furan:
Furfural:
Furnaces:
Fusion welding, of tubes into tubesheets in shell-and-tube heat exchangers,
Index
HEDH
A
B
C
D
E
F
F-correction method:
F-factor charts and equations for various heat exchanger configurations,
F-factor method:
F-type shells:
Fabrication:
Failure modes of heat exchangers,
Falling films, direct contact heat transfer in,
Falling film evaporator:
Fanno flow,
Fans in air-cooled heat exchangers:
Fatigue as failure mode of a heat exchanger
Fatigue life, of expansion bellows,
Fawcett, R
Fedor's method, for critical temperature,
Fenghour, A
Ferritic stainless steels, as material of construction,
Fick's law for diffusion,
Film boiling:
Film model, condenser design by
Film temperature, definition of for turbulent flow over flat plate,
Films in heat exchangers,
Filmwise condensation:
Fincotherm, heat transfer medium,
Finite-difference equations:
Finite difference methods:
Finite-element methods:
Fins (see also Extended surfaces):
Fire-tube boiler,
Fired heaters,
Fires, room, radiation interaction phenomena in,
Firsova, E V,
Fixed beds:
Fixed tubesheet, shell-and-tube exchangers:
Flanges, mechanical design of in heat exchangers,
Flash evaporation
Flat absorber of thermal radiation,
Flat heads:
Flat plate:
Flat reflector of thermal radiation,
Floating head designs for shell-and-tube heat exchangers:
Flooded type evaporator, in refrigeration,
Flooding phenomena:
Flow distribution:
Flow-induced vibration,
Flow regimes:
Flow stream analysis method for segmentally baffled shell and tube heat exchangers,
Flue gases, fouling by,
Fluid elastic instability as source of flow-induced vibration,
Fluid flow, lost work in,
Fluid mechanics, Eulerian formulation for,
Fluid-to-particle heat transfer in fluidized beds,
Fluidized bed dryer:
Fluidized bed gravity conveyors,
Fluidized beds:
Fluids:
Fluorine:
Fluorobenzene:
Fluoroethane (Refrigerant 161):
Fluoromethane (Refrigerant 41):
Fluted tubes:
Flux method, for modeling radiation in furnaces,
Flux relationships in heat exchangers,
Fogging in condensation
Food processing, fouling of heat exchangers in,
Forced flow reboilers:
Formaldehyde:
Formamide:
Formic acid:
Forster and Zuber correlation for nucleate boiling,
Fouling,
Foam systems, heat transfer in,
Four phase flows, examples,
Fourier law for conduction
Fourier number (Fo):
Frames for plate heat exchangers,
France, guide to national practice for mechanical design,
Free convection:
Free-fall velocity, of particles,
Free-stream turbulence, effect on flow over cylinders,
Freeze protection of air-cooled heat exchangers,
Freezing, of condensate in condensers
Fresnel relations in reflection of radiation,
Fretting corrosion,
Friction factor:
Friction multipliers in gas-liquid flow:
Friction velocity, definition,
Friedel correlation for frictional pressure gradient in straight channels,
Froude number:
Fuels, properties of,
Fuller, R K,
Furan:
Furfural:
Furnaces:
Fusion welding, of tubes into tubesheets in shell-and-tube heat exchangers,
G
H
I
J
K
L
M
N
O
P
Q
R
S
T
U
V
W
X
Y
Z
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Solid-Gas Flow
DOI 10.1615/hedhme.a.000155
2.3.3 Solid-gas flow
M. Weber and W. Stegmaier
A. Principle of pneumatic conveyance
Pneumatic conveyance is of great importance for the transport of grained and powdered materials, especially for short distances and in connection with heat exchange and mass transfer processes.
The physical principles involved are, however, very numerous. For this reason, only a few aspects of the phenomena will be treated here. A more exhaustive treatment of this principle of conveyance may be found in certain basic books (Brauer, 1971; Weber, 1974; Boothroyd, 1971; Soo, 1967; Zenz and Othmer, 1960; Leva, 1959).
(a) Pneumatic conveyance in vertical pipes
The principle of pneumatic conveyance may best be explained by referring to Figure 1 for the case of vertically upward movement. The weight of a solid particle FW and its inertial force Ms d υs /dt have to be compensated by the drag force FD and the force due to the pressure gradient Vs dp /dl, which are both opposite to the flow direction of the particle. To bring this about, the velocity of the fluid medium υg has to be greater than the free-fall velocity of the solid particle wso.
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