examples of heat transfer via conduction
An experimental investigation of heat transfer and fluid flow in a rectangular duct with inclined discrete ribs
Ngày tải lên :
05/09/2013, 16:10
... value of turbulent intensity is observed at the relative gap width of 1.0 which is in the line of heat
transfer measurements. These results of PIV showed good agreement between the heat transfer ... Investigation of heat transfer and friction for rib-
roughened surfaces, Int. Journal of Heat & Mass Transfer 1978; 21: 1143-1156.
[4] Webb R.L., Eckert E.R.G. and Goldstein R. J. Heat transfer ... Journal of Heat and Mass
Transfer1 999; 42: 1597-1615.
[16] Karwa R, Experimental studies of augmented heat transfer and friction in asymmetrically heated
rectangular ducts with ribs on the heated...
- 12
- 831
- 0
Ptinciples of heat transfer
Ngày tải lên :
08/04/2014, 11:00
... Basic Modes of Heat Transfer 2
1.1 The Relation of Heat Transfer to Thermodynamics 3
1.2 Dimensions and Units 7
1.3 Heat Conduction 9
1.4 Convection 17
1.5 Radiation 21
1.6 Combined Heat Transfer ... Combined Heat Transfer Systems
In the preceding sections the three basic mechanisms of heat transfer have been
treated separately. In practice, however, heat is usually transferred by several of the
basic ... specific heat c of the
solid are all constant.
The principle of conservation of energy for the control volume, surface area A,
and thickness of Fig. 2.2 can be stated as follows:
rate of heat conduction...
- 784
- 1.2K
- 0
molecular dynamics simulation of heat transfer and phase change during
Ngày tải lên :
06/05/2014, 08:55
...
surface of the target by scaling velocities of atoms in cells on
the top surface, and the same amount of heat flux is dissipated
from the bottom of the target by scaling velocities of atoms ... Study of Light-to -heat Absorption
Mechanism in atomic Systems," International Journal of Heat
and Mass Transfer, 41, pp. 839-849.
3. Häkkinen, H., and Landman, U., 1993, "Superheating, ... with 160,000 atoms. Heat
conduction by the electron gas, which dominated heat transfer
in metal, could not be predicted by the Morse potential
function. Alternatively, heat conduction was simulated...
- 10
- 505
- 0
molecular dynamics simulation of heat transfer and phase change during
Ngày tải lên :
06/05/2014, 08:57
... ASME
Proceedings of NHTC'01
35th National Heat Transfer Conference
Anaheim, California, June 10-12, 2001
NHTC2001-20070
MOLECULAR DYNAMICS SIMULATION OF HEAT TRANSFER AND PHASE ... the distribution of
number density of atoms in space at different times, which
demonstrates the variation of solid structure during laser
heating. At the early stage of laser heating, the crystal ... with 160,000 atoms. Heat
conduction by the electron gas, which dominated heat transfer
in metal, could not be predicted by the Morse potential
function. Alternatively, heat conduction was simulated...
- 10
- 429
- 0
doe fundamentals handbook - thermodynamics, heat transfer, and fluid flow - volume 1 of 3
Ngày tải lên :
17/03/2014, 15:00
... types of latent heat. The first is the latent heat of fusion. This
is the amount of heat added or removed to change phase between solid and liquid. The second
type of latent heat is the latent heat ... ENERGY, WORK, AND HEAT
Another type of heat is called latent heat. Latent heat is the amount of heat added to or removed
from a substance to produce a change in phase. When latent heat is added, ... latent heat of vaporization. This is the amount of heat added or
removed to change phase between liquid and vapor. The latent heat of vaporization is sometimes
called the latent heat of condensation.
Different...
- 138
- 1.5K
- 0
doe fundamentals handbook - thermodynamics, heat transfer, and fluid flow - volume 2 of 3
Ngày tải lên :
17/03/2014, 15:00
... modes of heat transfer:
Conduction involves the transfer of heat by the interactions of atoms or molecules of a
material through which the heat is being transferred.
Convection involves the transfer ... or
molecules of a material through which the heat is being transferred.
Convection involves the transfer of heat by the mixing and motion of
macroscopic portions of a fluid.
Radiation, or radiant heat transfer, ... HT-02
Heat Transfer
Intentionally Left Blank
HT-02 Page x Rev. 0
Heat Transfer TABLE OF CONTENTS
TABLE OF CONTENTS
LIST OF FIGURES iii
LIST OF TABLES iv
REFERENCES v
OBJECTIVES vii
HEAT TRANSFER...
- 80
- 1.6K
- 0
doe fundamentals handbook - thermodynamics, heat transfer, and fluid flow - volume 3 of 3
Ngày tải lên :
17/03/2014, 15:00
... feet, of a column of water that a given pressure will support. Each of
the energies possessed by a fluid can be expressed in terms of head. The elevation head
represents the potential energy of ... represents the flow energy of a column of fluid whose weight is equivalent to the
pressure of the fluid.
The sum of the elevation head, velocity head, and pressure head of a fluid is called the ... Av
• The principle of conservation of mass states that all mass flow rates into a
control volume are equal to all mass flow rates out of the control volume
plus the rate of change of mass within...
- 82
- 701
- 0
convective heat transfer mathematical and computational modelling of viscous fluids and porous media
Ngày tải lên :
01/04/2014, 10:51
... boundary conditions of practi-
cal interest. The number of excellent review articles, books and monographs, which
summarise the state -of- the-art of convective heat and mass transfer, which are ... delaying the onset of the separation of the boundary-layer from the plate,
as can be seen from Figure 2.15, where the plot of the location of the separation
point,
Xs,
as a function of
Pr (xs
is ... interest and meaningful suggestions of Professor T Y. Na and Dr. D. A. S.
Rees, the reviewers of this work. Secondly, the formatting of this book and the
preparation of the figures were performed...
- 648
- 796
- 0
fundamentals of heat and mas transfer seventh edition
Ngày tải lên :
02/04/2014, 15:51
... function of current for
the range 100 Յ I Յ 5000 A. Also plot the ratio
of the heat transfer by convection to the total heat
transfer.
1.62 A small sphere of reference-grade iron with a specific
heat ... surface of the wall. The heat loss through the wall of area
is then
᭠
Comments: Note the direction of heat flow and the distinction between heat flux and
heat rate.
*This icon identifies examples ...
radiative heat flux and the heat flux by conduction
across a gap distance of L ϭ 0.2 mm. Also deter-
mine the value of (dT
w
/dt)
i
, resulting from each of
the heating modes.
(b) For gap distances of...
- 1.1K
- 1.3K
- 0
fundamentals of heat and mass transfer
Ngày tải lên :
02/04/2014, 15:51
... description of the heat
transfer between a heat engine and its surroundings further limits the actual efficiency of a
heat engine.
1.3.1 Relationship to the First Law of Thermodynamics
(Conservation of ... heater dissipates
2 kW while submerged in a water flow that is at 20ЊC
and provides a convection heat transfer coefficient of
h ϭ 5000 W/m
2
⅐ K. Neglecting heat transfer from the
ends of the heater, ... 20-mm-thick
sheet of the material is T
1
Ϫ T
2
ϭ 10ЊC.
(a) What is the heat flux through a 2 m ϫ 2 m sheet of
the insulation?
(b) What is the rate of heat transfer through the sheet
of insulation?
1.2 The heat...
- 1.1K
- 5.7K
- 1
incropera fundamentals of heat and mass transfer
Ngày tải lên :
02/04/2014, 15:52
... generally small, concurrent
heat transfer by radiation and/or conduction must often be considered. However, jet impingement is one
of the more effective means of transferring heat by convection and ... tot
q/q
′′
vs. T, note that the convection heat transfer 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 ... Electrical heater is perfectly insulated
from dryer wall, (3) Heater and switch are isothermal at T
set
, (4) Negligible heat transfer from
sides of heater or switch, (5) Switch surface, A
s
, loses heat...
- 2.1K
- 15.5K
- 1
mass and heat transfer analysis of mass contactors and heat exchangers (cambridge series in chemical engineering)
Ngày tải lên :
02/04/2014, 15:52
... 11:4
Mass and Heat Transfer
ANALYSIS OF MASS CONTACTORS
AND HEAT EXCHANGERS
T. W. FRASER RUSSELL
University of Delaware
ANNE SKAJA ROBINSON
University of Delaware
NORMAN J. WAGNER
University of Delaware
v
P1: ... 521 88670 3 December 21, 2007 23:45
68 Heat Exchanger Analysis
Batch and semibatch heat exchangers are used when the heating or cooling of a
fixed volume of fluid is required, whereas continuous ... entity. Each of these types of exchangers
is discussed next.
3.3.1 Batch Heat Exchanger
The batch heat exchanger system was discussed extensively in Subsection 3.2.3 with
the development of methods...
- 405
- 3.2K
- 0
Fundementals of heat and mass transfer kotandaraman
Ngày tải lên :
08/04/2014, 10:55
... COMBINED MODES OF HEAT TRANSFER
Previous sections treated each mode of heat transfer separately. But in practice all the three
modes of heat transfer can occur simultaneously. Additionally heat generation ... Problem model.
VED
c-4\n-demo\demo1-1.pm5
12 FUNDAMENTALS OF HEAT AND MASS TRANSFER
Solution: Refer equation 1.10
Heat convected + heat radiated = heat conducted considering 1m
2
,
h(T
1
– T
2
) + ... transfer
Example 1.2: Determine the heat transfer by convection over a surface of 0.5 m
2
area if the
surface is at 160°C and fluid is at 40°C. The value of convective heat transfer coefficient is 25
W/m
2
K....
- 729
- 733
- 0
heat transfer in femtosecond laserprocessing of metal
Ngày tải lên :
06/05/2014, 08:53
... L. Tien, Heat Transfer Mechanisms during Short-Pulse Laser Heating of
Metals, ASME J. Heat Transfer, vol. 115, pp. 835–841, 1993.
5. T. Q. Qiu and C. L. Tien, Femtosecond Laser Heating of Multi-Layer ... describes the absorpt ion of heat by the electron system from
the laser, the heat diffusion among the electrons, and transfer of heat to the lattice. S
is the laser heating source term, defined ... model looks at the heati ng mechanism as consisting of three processes:
the absorption of laser energy by the electrons, the transport of energy by the elec-
trons, and heating of the lattice by...
- 15
- 290
- 0