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Hagen-Poiseuille law
Hagen-Rubens relation, between electrical and optical constants,
Hall Taylor, N S,
Halogenated hydrocarbons:
Handley and Heggs equation for fixed bed pressure drop,
Hankinson and Thomson method, for liquid density:
Hardening (precipative) of stainless steels,
Hardwick, R,
Harris, D,
Hausen equation for developing laminar flow,
Hays, G F
Headers in shell-and-tube heat exchangers,
Heads, in heat exchangers:
Heat and mass transfer:
Heat exchanger design, introduction,
Heat exchangers:
Heat of vaporisation (see Enthalpy of vaporisation), of pure substances
Heat pipes:
axial heat transfer and operational envelope for,
characteristics of wicks for,
circulation and axial heat transfer in,
introduction to
two-phase loop with capillary pump,
selection of working fluid for,
start-up and control of,
temperature distribution and radial heat flux in,
Heat pumping, relation to heat exchanger network design,
Heat storage (see Regenerators and thermal energy storage) entropy generation in,
Heat transfer:
Heat transfer coefficient:
Heat transfer media,
Heat transfer salt,
Heat transfer regimes:
Heat of vaporization,
Heated cavity reflectometer,
Heating media, for reboilers,
Heavy water, physical properties of,
Heggs, P J,
Helical coils of circular cross section:
Helical coils of rectangular cross section,
Helical inserts, for enhancement of heat transfer in boiling,
Helium:
Helmholtz reciprocity principle, in radiative heat transfer,
Henry, J A R,
Henry-Fauske model, for critical two-phase flow,
Henry's law, for partial pressure,
Heptadecane:
Heptadecene:
Heptane:
1-Heptanol:
1-Heptene:
Herman, K W,
Hermes, C L L,
Heterogeneous conveyance in horizontal pipes,
Heterogeneous nucleation in boiling,
Hewitt, G F
Hexachloroethane (Refrigerant 116):
Hexacyclopentane, superheated vapor properties,
Hexadecane:
Hexadecene:
1,5-Hexadiene:
Hexagonal cells, in free convection,
Hexamethylbenzene:
Hexane:
Hexanoic acid:
1-Hexanol:
1-Hexene:
Hexylbenzene:
Hexylcyclohexane:
Hexylcyclopentane,
Hicks equation, for fixed-bed pressure drop,
High pressure closures, ASME VIII code guidance for,
High-chrome steels, thermal and mechanical properties,
High-finned tubes, correlations for single-phase heat transfer in flow over,
Hills, P D
Hohlraum cavity,
Holdup, in liquid-liquid flow,
Holland, guide to national practice for mechanical design of heat exchangers,
Homogeneous condensation (fog formation),
Homogeneous model:
Homogeneous nucleation:
Honeycombs:
Hopkins, D,
Horizontal condensers:
Horizontal cylinders:
Horizontal layers, of fluid, free convection heat transfer in,
Horizontal pipes:
Horizontal shell-side evaporator,
Horizontal surfaces:
Horizontal thermosiphon reboilers:
Horizontal tube-side evaporator,
Horizontal tubes:
Hottel's rule, in absorption of radiation by gases,
Hsu criterion, for onset of nucleate boiling,
Hybrid cooling towers,
Hydraulic conveyance:
Hydraulic expansion, of tubes into tube sheets in shell-and-tube heat exchangers,
Hydraulic turbine, lost work in,
Hydraulic resistance, in flow of supercritical fluids,
Hydraulically smooth surface,
Hydrazine:
Hydrocarbons:
Hydrodynamic entrance length, in single-phase flow in ducts,
Hydrogen:
Hydrogen bromide:
Hydrogen chloride:
Hydrogen cyanide:
Hydrogen fluoride:
Hydrogen iodide:
Hydrogen peroxide:
Hydrogen sulfide:
Hydrostatic testing of shell-and-tube heat exchangers,
Hysteresis:
Index
HEDH
A
B
C
D
E
F
G
H
Hagen-Poiseuille law
Hagen-Rubens relation, between electrical and optical constants,
Hall Taylor, N S,
Halogenated hydrocarbons:
Handley and Heggs equation for fixed bed pressure drop,
Hankinson and Thomson method, for liquid density:
Hardening (precipative) of stainless steels,
Hardwick, R,
Harris, D,
Hausen equation for developing laminar flow,
Hays, G F
Headers in shell-and-tube heat exchangers,
Heads, in heat exchangers:
Heat and mass transfer:
Heat exchanger design, introduction,
Heat exchangers:
Heat of vaporisation (see Enthalpy of vaporisation), of pure substances
Heat pipes:
I
J
K
L
M
N
O
P
Q
R
S
T
U
V
W
X
Y
Z
axial heat transfer and operational envelope for,
characteristics of wicks for,
circulation and axial heat transfer in,
introduction to
two-phase loop with capillary pump,
selection of working fluid for,
start-up and control of,
temperature distribution and radial heat flux in,
Heat pumping, relation to heat exchanger network design,
Heat storage (see Regenerators and thermal energy storage) entropy generation in,
Heat transfer:
Heat transfer coefficient:
Heat transfer media,
Heat transfer salt,
Heat transfer regimes:
Heat of vaporization,
Heated cavity reflectometer,
Heating media, for reboilers,
Heavy water, physical properties of,
Heggs, P J,
Helical coils of circular cross section:
Helical coils of rectangular cross section,
Helical inserts, for enhancement of heat transfer in boiling,
Helium:
Helmholtz reciprocity principle, in radiative heat transfer,
Henry, J A R,
Henry-Fauske model, for critical two-phase flow,
Henry's law, for partial pressure,
Heptadecane:
Heptadecene:
Heptane:
1-Heptanol:
1-Heptene:
Herman, K W,
Hermes, C L L,
Heterogeneous conveyance in horizontal pipes,
Heterogeneous nucleation in boiling,
Hewitt, G F
Hexachloroethane (Refrigerant 116):
Hexacyclopentane, superheated vapor properties,
Hexadecane:
Hexadecene:
1,5-Hexadiene:
Hexagonal cells, in free convection,
Hexamethylbenzene:
Hexane:
Hexanoic acid:
1-Hexanol:
1-Hexene:
Hexylbenzene:
Hexylcyclohexane:
Hexylcyclopentane,
Hicks equation, for fixed-bed pressure drop,
High pressure closures, ASME VIII code guidance for,
High-chrome steels, thermal and mechanical properties,
High-finned tubes, correlations for single-phase heat transfer in flow over,
Hills, P D
Hohlraum cavity,
Holdup, in liquid-liquid flow,
Holland, guide to national practice for mechanical design of heat exchangers,
Homogeneous condensation (fog formation),
Homogeneous model:
Homogeneous nucleation:
Honeycombs:
Hopkins, D,
Horizontal condensers:
Horizontal cylinders:
Horizontal layers, of fluid, free convection heat transfer in,
Horizontal pipes:
Horizontal shell-side evaporator,
Horizontal surfaces:
Horizontal thermosiphon reboilers:
Horizontal tube-side evaporator,
Horizontal tubes:
Hottel's rule, in absorption of radiation by gases,
Hsu criterion, for onset of nucleate boiling,
Hybrid cooling towers,
Hydraulic conveyance:
Hydraulic expansion, of tubes into tube sheets in shell-and-tube heat exchangers,
Hydraulic turbine, lost work in,
Hydraulic resistance, in flow of supercritical fluids,
Hydraulically smooth surface,
Hydrazine:
Hydrocarbons:
Hydrodynamic entrance length, in single-phase flow in ducts,
Hydrogen:
Hydrogen bromide:
Hydrogen chloride:
Hydrogen cyanide:
Hydrogen fluoride:
Hydrogen iodide:
Hydrogen peroxide:
Hydrogen sulfide:
Hydrostatic testing of shell-and-tube heat exchangers,
Hysteresis:
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Circulation and axial heat transfer
DOI 10.1615/hedhme.a.000311
3.10.2 Circulation and axial heat transfer
D. Chisholm and D. Mishkinis
At all points along the length of the heat pipe, at the interface between the vapor and the liquid, the difference in the static pressures of the phases is balanced by the local capillary pressure difference. The equilibrium condition is expressed as
\[\label{eq1}p_v-p_l=\frac{2\sigma\cos\alpha}{r}\tag{1}\]
The interface adjusts its location within the wick pore structure such that there is an equilibrium condition: the interface finds the pore radius r, which satisfies Equation 1.
Figure 1 illustrates the variation of pressure and mass flow rate along the heat pipe and also the associated interfaced distribution. Maximum circulation will occur when there is no pressure difference between the phase at one point (in the case illustrated at the end of the condenser), whereas at the end of the evaporator the liquid interface is at the plane where the pore radius is smallest. The capillary pressure difference over the heat pipe length is then
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