heat and mass transfer data book by c p kothandaraman pdf
CONVECTIVE HEAT AND MASS TRANSFER ppt
Ngày tải lên :
30/03/2014, 19:20
... C
P
/k
)
Pe
l,ma
Mass transfer Peclet number = Ul/D
Po Poiseuille number =
2τ
s
D
H
μ U
Pr Prandtl number = μ C
P
/k
P
r
Reduced pressure = P/ P
cr
Pr
tu
Turbulent Prandtl number
p
f
Wetted perimeter (m)
p
heat
Heated ... total mass flux vector (kg/m
2
s); number density
(m
−3
); dimensionless constant; polytropic exponent
P Property
P Pressure (N/m
2
); Legendre polynomial
Pe
l
Peclet number = Ul
(
ρ C
P
/k
)
Pe
l,ma
Mass ... thermal
expansion (1/K)
β
ma
Coefficient of volumetric expansion with respect to mass fraction
β
∗
ma
Coefficient of volumetric expansion with respect to concentration
(kg/m
3
)
−1
˜
β
ma
Coefficient...
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Heat and Mass Transfer in Porous Media pdf
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31/03/2014, 16:20
... pipe conductance in a VCHP is reduced or blocked by the
evaporator
adiabatic
zone
condenser
vapour
Micro channels
cross section
liquid
electronic
components
Heat output
Fig. 9 Micro heat pipe ... three decades ago for space applications,
heat pipes are now extensively and successfully applied to electronics and
microelectronics cooling (Fig. 8), bio-medical products and many others devices
[3–6]. ... a
single vapour core and a 2D capillary structure, such as metallic meshes or crossed
grooves.
1.7 Variable Conductance Heat Pipe
A variable conductance heat pipe (VCHP) is an active thermal control...
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heat and mass transfer
Ngày tải lên :
02/04/2014, 15:27
... as
convective mass transfer corresponds to convective mass transfer. Mass transfer
by diffusion and convection are the only sorts of mass transfer. Radiative heat
transfer has no corresponding mass transfer ... vari-
ables which appear, space coordinates, velocity components and temperature, are
made dimensionless by dividing respectively by a characteristic length, velocity
and temperature. The original partial ... 1.34:Ratio(kA)
co
/ (kA)
cc
= N
co
i
/N
cc
i
of the transfer capabilities in cocur-
rent (index co) and countercurrent (index cc) flows as a function of ε
i
and C
i
ϑ
i
(i =1,2) are important, cf. Fig....
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fundamentals of heat and mass transfer
Ngày tải lên :
02/04/2014, 15:51
... transferred to the air by forced
convection. Hence, for a prescribed electrical power, the
temperature of the wire depends on the convection coef-
ficient, which, in turn, depends on the velocity ... Parallel Plate Channels and Section 9.9 Combined
Free and Forced Convection. In contrast to resistances associated with free convection,
thermal resistances corresponding to liquid-vapor phase change ... Temperature-Dependent Properties 544
8.5 Convection Correlations: Turbulent Flow in Circular Tubes 544
8.6 Convection Correlations: Noncircular Tubes and the Concentric
Tube Annulus 552
8.7 Heat Transfer Enhancement...
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fundamentals of momentum, heat, and mass transfer 5th edition
Ngày tải lên :
02/04/2014, 15:51
... groups: body forces and surface
forces. Body forces are those which act witho ut physical contact, for example, gravity and
electrostatic forces. On the contrary, pressure and frictional forces ... derivation of velocity profiles is discussed in Chapter 8.
h
h
ut
Figure 7.2 Velocity and
shear stress profiles for
flow between two parallel
plates.
Ideal plastic
Real plastic
Pseudo plastic
Newtonian ... of
1ft
3
/s. Calculate the differential manometer reading in inches of
78 Chapter 6 Conservation of Energy: Control-Volume Approach
Of speci c interest in momentum transfer is the description of the point-to-point
variation...
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incropera fundamentals of heat and mass transfer
Ngày tải lên :
02/04/2014, 15:52
... 1.21
KNOWN: Upper temperature set point, T
set
, of a bimetallic switch and convection heat
transfer coefficient between clothes dryer air and exposed surface of switch.
FIND: Electrical power for heater ... to 14 C for a reference
sphere and test sphere of unknown composition suddenly immersed in a stirred water-ice mixture.
Mass and specific heat of reference sphere.
FIND:
Specific heat of ...
// Convection coefficient
hbar = 1.21 * (D^-0.25) * (Ts - Tinf)^0.25 // Compact convection coeff. correlation
// Convection vs. total heat rates
cvovertot = q'cv / (q'cv + q'rad)...
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momentum, heat, and mass transfer fundamentals
Ngày tải lên :
02/04/2014, 15:53
...
balance
Generation
of
mass
of
a
species
Accumulation of mass of a
species
Input
and
output of mass of
a
species
Example
2.1.2-1
Macroscopic species
mass
balance with
zero
-0
rde ...
of
continuum
Chapter 1 Problems
2
THE
MASS BALANCES
2.1
The
Macroscopic Mass Balances
Figure 2.1
-
1 System for
mass
balances
2.1.1 The macroscopic total
mass
balance
Accumulation ...
Figure 2.2.1-1
Air
compression by pisiston
2.2.2 The microscopic species mass balance
Diffusion
Chapter 2 Problems
3
THE ENERGY
BALANCES
3.1 The Macroscopic Energy Balances
67
69
73
73...
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Fundementals of heat and mass transfer kotandaraman
Ngày tải lên :
08/04/2014, 10:55
... are convection coefficients.
Example 1.4: A slab 0.2 m thick with thermal conductivity of 45 W/mK receives heat from a
furnace at 500 K both by convection and radiation. The convection coefficient ... interface. This
is termed as contact resistance. A
significant temperature drop develops at
the interface and this has to be taken into
account in heat transfer calculation. The
contact resistance ... which heat flow
decreases is termed as critical thickness. In the case of cylinders and spheres it is called critical
radius. An expression for the same can be obtained by finding the rate of change...
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Heat and Mass Transfer Modeling and Simulation Part 1 pptx
Ngày tải lên :
19/06/2014, 10:20
...
analytical/numerical solutions and optimization of the processes.
The first chapter deals with the description and mass transfer analysis of fixed-bed
chromatographic processes by kinetic adsorption. ... chromatographic systems as can be verified by
the typical result of the experimental curve in Fig. 4b. This characteristical aspect (“s”
profile) for the chromatographic answer is called the rupture ... second chapter focuses on the
effects of gas diffusion layer on the heat transfer process in high temperature
polymerization. Chapter 3 is concerned with the description and analysis of heat...
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Heat and Mass Transfer Modeling and Simulation Part 2 ppt
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19/06/2014, 10:20
...
temperature phosphoric acid doped PBI-based PEMFC.
CARBON SUPPORT
CATALYTIC
LAYER
Catalyst
Electrolyte
MICROPOROUS LAYER: Carbon
black + polymeric binder
Fig. 3. Schematic general structure ... dependant on the cell operation conditions (Liu et al., 2006).
Reactants
Reactants
Products
B
R
C
S
R
C
C
R
C
C
P
C
S
P
C
B
P
C
Net flux
of
reactants
Net flux
of
products
Flow
fields
Gas channels
Gas
diffusion
layer
Catalytic
layer
C
R
C
Cat
R
C
Gas
channels
in ...
Heat and Mass Transfer – Modeling and Simulation
26
circuit constant phase element and resistance, related to the charge transfer processes
(kinetic), and another parallel mini-circuit constant...
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Heat and Mass Transfer Modeling and Simulation Part 3 pot
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19/06/2014, 10:20
... E cell voltage
C
P
S
product concentration at the
external surface of the electrode
E
0
open circuit voltage
C
R
C
reactant concentration at the
catalytic layer
b Tafel slope
C
P
C
... more
carbon to the MPL. As previously commented for the Teflon percentage, part of the MPL
will penetrate inside the macroporous carbon support, and therefore, will occlude part of
the macropores. ... its protective role since it is expected that no catalytic
particle will penetrate inside the carbon support. Contrarily, the microporous region
increases with the carbon content of the MPL....
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Heat and Mass Transfer Modeling and Simulation Part 4 docx
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19/06/2014, 10:20
... SaaSv
PWPP
RH
PP W PP
(69)
Where P
a
, P
v
and P
s,v
respectively represent, air total pressure, water vapor partial pressure
and water vapor saturation pressure. If we neglect the ... study of process intensification and
optimization of SR for hydrogen production becomes important for the improvement of the
reactor performance by enhancing heat and mass transfer and this can ... gas and un-reacted liquid products was analyzed by a gas
chromatograph (GC2000) equipped with a thermal conductivity detector and two packed
columns (Poropak-Q for the separation of un-reacted...
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Heat and Mass Transfer Modeling and Simulation Part 5 pdf
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19/06/2014, 10:20
... resistance in the catalytic bed.
3. Process intensification of steam reforming by cold sprayed catalytic
coating
3.1 Experimental
Except micro-scale reactor adoption, coating catalyst can also be ... surface and/ or deposited
coating surface. Therefore, it could be concluded that the process of oxide aggregated
catalytic coating fabrication by cold spray is not like the metal coating fabrication, ... gradual increase of CO. When
WHSV became larger, it became main factor
which influenced the composition of products. And this may promote positive reaction of
RWGS and further decreasing CO content....
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Heat and Mass Transfer Modeling and Simulation Part 6 pptx
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19/06/2014, 10:20
...
C
molar concentration, kmol/m
3
P
mixed gas pressure, Pa
p
C
Isobaric specific heat capacity,
J/(mol·K)
mixed gas viscosity coefficient,
kg/(m·s)
D
effective diffusion coefficient, ... obtained by using empirical models based on experimental
data for computing viscosity and thermal conductivity of water-alumina and water-CuO
suspensions, and based on a macroscopic modelling ... the adoption of both micro-scale reactors and coating catalyst, heat and
mass transfer in the reaction channel for hydrogen production by fuel reforming can be
enhanced resulting in the improvement...
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Heat and Mass Transfer Modeling and Simulation Part 7 doc
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19/06/2014, 10:20
...
CTV CTV CTV CTV CTV CTV
YYY
s
plash fill trickle fill film fill
CC CC CC
123
CTV CTV CTV CTV
CCCC (68)
, 1, ,3
iii
CTV
Ceyi (69)
Common values for unit costs
i
e are reported ...
effectiveness-NTU approach can be used, and it is recommended to determine the fill
performance characteristics close to the tower operational conditions (Kloppers & Kröger,
2005a). Quick and accurate ... dependent of the nanoparticle volume fraction.
6. Nomenclature
Cp specific heat capacity J.kg
-1
.K
-1
g acceleration of the gravity m.s
-2
h heat transfer coefficient W.m
-2
.K
-1
Heat...
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