...
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 of
mass
Input and output of mass ... theory and penetration-renewal theory
8.4
The
Mass
Transfer Coefficient for a Single Phase
Example 8.4-1 Calculation offluxfrom a
mass
transfer
coefficient
Exutizple 8.4-2 Masstransfer ...
and insert the appropriate limits.
54
Chapter
1:
Essentials
L
I
Similarly, for
constant
p
and
c,
using
m1A ,mtalmol =CAmolA
massA totalmass
=
massA
to;
mol vol vol
totalmass...
... Rodrigo and José J. Linares
Chapter 3 Numerical Analysis of HeatandMass
Transfer in a Fin -and- Tube Air Heat Exchanger
under Full and Partial Dehumidification Conditions 41
Riad Benelmir and ... 3 is concerned with the description and analysis of heatand
mass transfer processes in a fin -and- tube air heater. Hydrogen production by steam
reforming and the process intensification strategies ... reference for scientists and academics working in
research areas mentioned above, at least in the aspects of heat and/ or mass transfer,
analytical/numerical solutionsand optimization of the...
...
resistance
(R
Ω
)
Charge
transfer CPE
Charge transfer
resistance (R
ct
)
Mass transfer
resistance (R
mt
)
CHARGE
TRANSFER
CONTRIBUTION
MASS TRANSFER
CONTRIBUTION
Mass transfer
CPE
(a)
0.0 ...
Heat andMassTransfer – Modeling and Simulation
26
circuit constant phase element and resistance, related to the charge transfer processes
(kinetic), and another parallel ... access of the reactants,
Heat andMassTransfer – Modeling and Simulation
30
does not only have influence in terms of masstransfer limitations, but in kinetic and ohmic
ones due to an excess...
... simultaneous heatandmasstransfer on the cooling surface. Many experimental, and
few numerical, studies have been carried out to study the heatandmasstransfer
characteristics of the fin -and- tube heat ... and the fin.
This work will consider the heatandmasstransfer for a representative tube and fin
elementary unit.
Heat andMassTransfer – Modeling and Simulation
40
Prasanna, M.; Ha, ... 0013-4651.
Heat andMassTransfer – Modeling and Simulation
44
Fig. 2. Schematic of fins arranged around tubes lined up or ranked in staggered rows
The investigation of heatandmass transfer...
... with combined heatandmass
transfer, ASHRAE transactions, Part 1, 100, 367-374.
Numerical Analysis of HeatandMassTransfer in a Fin -and- Tube
Air Heat Exchanger under Full and Partial Dehumidification ... going up the inlet and outlet or the upper and
lower fin edges, and is also minimal near the tube surface.
2.4.2 Solving heatandmasstransfer equations
The heatandmasstransfer problem has ... fin -and- tube heat exchanger. Ones the airflow profile was determined, the water
vapor, air stream and fin heatandmass balance equations were solved simultaneously. It
Heat andMass Transfer...
...
WHSV and is about 250℃ in
this experiment.
Fig. 3. Effects of temperature on methanol conversion, hydrogen yield, H
2
and CO in the
products.
Heat andMassTransfer – Modeling and ... driving gas and carrying gas with an inlet pressure of 1.4
and 1.6 MPa for the heating gas and powder carrying gas separately. Heating gas temperature
range is 573 K to 773 K. Stand-off distance ... than the copper coating. Probable
Heat andMassTransfer – Modeling and Simulation
78
Morphology of the cold sprayed NiO/Al
2
O
3
coating before and after SRM is also shown in
Fig.8....
... natural and forced convective heatandmasstransfer regimes
for nanofluids flowing in semi-infinite geometries, i.e. external boundary layer flows along
Heat andMassTransfer – Modeling and ... nanofluid.
Heat andMassTransfer – Modeling and Simulation
92
8. Nomenclature
C
molar concentration, kmol/m
3
P
mixed gas pressure, Pa
p
C
Isobaric specific heat capacity,
J/(mol·K) ... velocity profiles, streamlines and boundary layer
thickness. Heattransfer characteristics are then presented by means of wall temperature
distribution and convective heattransfer coefficients.
2....
... the gravity m.s
-2
h heattransfer coefficient W.m
-2
.K
-1
Heat andMassTransfer – Modeling and Simulation
116
Wang, X Q. &, Mujumdar, A.S. (2007). Heattransfer characteristics ... Buoyancy-driven heattransfer enhancement
in a two-dimensional enclosure using nanofluids. Int. J. HeatMass Transf. Vol. 46
pp.3639-3653.
Heat andMassTransfer – Modeling and Simulation ... components and there are many references that present the
fundamentals to understand these units (Foust et al., 1979; Singham, 1983; Mills, 1999;
Kloppers & Kröger, 2005a).
The heatandmass transfer...
... heatandmass
transfer analysis of counterflow wet-cooling towers. International Journal of Heat
and Mass Transfer, Vol. 48, No. 3-4, (January 2005), pp. 765-777, ISSN 0017-9310.
Heat and ...
r makeup
Heat andMassTransfer – Modeling and Simulation
144
dependent on the completeness of the mathematical model and the relationships used to
describe heatandmasstransfer phenomena ...
Roth, M. (2001). Fundamentals of heatandmasstransfer in wet cooling towers. All well
known or are further development necessary. Proceedings of 12
th
IAHR Cooling
Tower andHeat Exchangers,...
... and dry matter of samples
Heat andMassTransfer – Modeling and Simulation
152
i. the external masstransfer resistance is negligible, but the internal masstransfer
resistance is large ... (55), and (63))
Heat andMassTransfer – Modeling and Simulation
170
(1)
2
1
Ml
O
g
iL i
i
P
nan
P
(7)
The calculation of the system composition to the balance coupled with the mass ... G. (1963). Natural Convection Mass- Transfer Measurements on Spheres and
Horizontal Cylinders by an Electrochemical Method.
International Journal of Heat
and Mass Transfer
, Vol. 6, No. 10, (October,...
... New York: VCH, (1989)
Heat andMassTransfer – Modeling and Simulation
188
[19] Chase Malcolm, NIST-JANAF, Thermochemical Tables, Fourth Edition, J. of Phys. and
Chem. Ref. Data, Monograph ...
Ti
3
O
5
, and Ti
4
O
7
.
Heat andMassTransfer – Modeling and Simulation
180
9.3 Influence of current
To study the influence of the current on the radioelement volatility, the temperature and ... energy and
(1.1)*
*
()
ij
T
is the reduced collision
integral.
For an interaction between two non-polar particles ‘i’ and ‘j’:
i
j
i
j
(34)
Heat andMassTransfer – Modeling and...
... fluctuation
Heat andMassTransfer – Modeling and Simulation
204
where
2s
cr
is the mean square height of surface fluctuation in atomic scale at the initial
state. X and Y are the x- and y-lengths ... formation.
Heat andMassTransfer – Modeling and Simulation
202
is the density, and
m
D is the diffusion coefficient.
0
B
is the magnetic flux density, L is the
electrode length, and
*
...
fluctuations of the electrochemical potentials at the double layer and the diffusion layer.
Heat andMassTransfer – Modeling and Simulation
196
*
,, ,
,, ,
0,
a
a
a
m
a
m
m
cx
y
t
RT
Hxy...
... The symbols dQ and dW represent differential heattransferand work
done, respectively. The differential operator, d, is used as both heattransferand work
are path functions and the evaluation ... 380
23.10 Radiant HeatTransfer Between Gray Surfaces 381
23.11 Radiation from Gases 388
23.12 The Radiation Heat- Transfer Coefficient 392
23.13 Closure 393
24. Fundamentals of MassTransfer 398
24.1 ... Molecular MassTransfer 399
24.2 The Diffusion Coefficient 407
24.3 Convective MassTransfer 428
24.4 Closure 429
25. Differential Equations of MassTransfer 433
25.1 The Differential Equation for Mass...
... Convection HeatandMassTransfer 457
7.5 The Sphere 465
7.6 Flow Across Banks of Tubes 468
7.7 Impinging Jets 477
7.7.1 Hydrodynamic and Geometric Considerations 477
7.7.2 Convection HeatandMassTransfer ... Introduction sets the stage for any course in heat transfer. It explains the
linkage between heattransferand thermodynamics, and it reveals the relevance and rich-
ness of the subject. It should ... the text and by practicing engineers. However, Section 8.7 HeatTransfer Enhance-
ment, and Section 8.8 Flow in Small Channels may be viewed as optional.
Buoyancy-induced flow andheat transfer...
... Electrical heater is perfectly insulated
from dryer wall, (3) Heater and switch are isothermal at T
set
, (4) Negligible heattransfer from
sides of heater or switch, (5) Switch surface, A
s
, loses heat ... Inner and outer
surface temperatures.
FIND: Heat flux through container wall and total heat load.
SCHEMATIC:
ASSUMPTIONS: (1) Steady-state conditions, (2) Negligible heattransfer ... tot
q/q
′′
vs. T, note that the convection heattransfer rate is always a
small fraction of the total heat transfer. That is, radiation is the dominant mode of heat transfer. Note
also that the convection...