3 types of heat transfer worksheet
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
... Journal of Heat Mass Transfer 20 03; 30 (2): 241-250.
[17] Bhagoria J.L. and Sahu M.M. Augmentation of heat transfer coefficient by using 900 broken
transverse ribs on absorber plate of solar air heater, ... Transactions of the ASME Journal of turbo machinery 1991b; 1 13: 36 7-
37 4.
[8] Hu Z. and Shen J. Heat transfer enhancement in a conversing passage with discrete ribs. Int.
Journal Heat and Mass Transfer ... Investigation of heat transfer and friction for rib-
roughened surfaces, Int. Journal of Heat & Mass Transfer 1978; 21: 11 43- 1156.
[4] Webb R.L., Eckert E.R.G. and Goldstein R. J. Heat transfer...
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- 831
- 0
Ptinciples of heat transfer
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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 ... ft
3
) 1 Btu/(h и ft
3
) ϭ 10 .34 3 W/m
3
per unit volume
Heat transfer coefficient 1 W/(m
2
и K) ϭ 0.1761 Btu/(h и ft
2
и °F) 1 Btu/(h и ft
2
и °F) ϭ 5.678 W/(m
2
и K)
Heat transfer rate 1 W ϭ 3. 412 ... Introduction 231
4.2 Convection Heat Transfer 231
4 .3 Boundary Layer Fundamentals 233
4.4 Conservation Equations of Mass, Momentum, and Energy for Laminar Flow Over
a Flat Plate 235
4.5 Dimensionless...
- 784
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molecular dynamics simulation of heat transfer and phase change during
Ngày tải lên :
06/05/2014, 08:55
... 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., 19 93, "Superheating, ... 39 , pp. 37 5-
37 7.
5. Kotake, S., and Kuroki, M., 19 93, "Molecular Dynamics
Study of Solid Melting and Vaporization by Laser Irradiation,"
International Journal of Heat and Mass Transfer, ...
Molecular Dynamics Study on Light-to -heat Absorption
Mechanism: Two Metallic Atom System," International Journal
of Heat and Mass Transfer, 40, pp. 32 09 -32 22.
2. Shibahara, M., and Kotake,...
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molecular dynamics simulation of heat transfer and phase change during
Ngày tải lên :
06/05/2014, 08:57
... ASME
Proceedings of NHTC'01
35 th 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 ... consisting of 13 atoms or
less [1, 2]. Their work was focused on the structural change of
metallic atoms due to laser beam absorption. Häkkinen and
Landman [3] studied dynamics of superheating,...
- 10
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- 0
doe fundamentals handbook - thermodynamics, heat transfer, and fluid flow - volume 1 of 3
Ngày tải lên :
17/03/2014, 15:00
... 29
Summary 30
CHANGE OF PHASE 31
Classification of Properties 31
Saturation 33
Saturated and Subcooled Liquids 33
Quality 34
Moisture Content 35
Saturated and Superheated Vapors 35
Constant Pressure Heat ... 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 of vaporization. ... psia = 408 inches of water
ã 14.7 psia = 29.9 inches of mercury
ã 1 inch of mercury = 25.4 millimeters of mercury
ã 1 millimeter of mercury = 10
3
microns of mercury
Rev. 0 Page 13 HT-01
Thermodynamics...
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doe fundamentals handbook - thermodynamics, heat transfer, and fluid flow - volume 2 of 3
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17/03/2014, 15:00
... 1
Heat and Temperature 1
Heat and Work 2
Modes of Transferring Heat 2
Heat Flux 3
Thermal Conductivity 3
Log Mean Temperature Difference 3
Convective Heat Transfer Coefficient 4
Overall Heat Transfer ... 31
Non-Regenerative Heat Exchanger 34
Regenerative Heat Exchanger 34
Cooling Towers 35
Log Mean Temperature Difference Application to Heat Exchangers 36
Overall Heat Transfer Coefficient 37
Summary 39
BOILING HEAT ... 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...
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doe fundamentals handbook - thermodynamics, heat transfer, and fluid flow - volume 3 of 3
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17/03/2014, 15:00
... Equation 32
Minor Losses 34
Equivalent Piping Length 34
Summary 36
NATURAL CIRCULATION 37
Forced and Natural Circulation 37
Thermal Driving Head 37
Conditions Required for Natural Circulation 38
Example ... Systems 23
Restrictions on the Simplified Bernoulli Equation 25
Extended Bernoulli 25
Application of Bernoulli’s Equation to a Venturi 27
Summary 30
HEAD LOSS 31
Head Loss 31
Friction Factor 31
Darcy’s ... ˙m
outlets
˙m
12
˙m
10
˙m
8
˙m
8
˙m
12
˙m
10
(ρAv)
8
˙m
12
(ρAv)
10
v
8
˙m
12
(ρAv)
10
(ρA)
8
500
lbm
sec
62.4
lbm
ft
3
(0.545 ft
2
)
10
ft
sec
62.4
lbm
ft
3
(0 .34 9 ft
2
)
v
8
7 .3
ft
sec
Summary
The main points of this chapter are summarized on the next page.
Rev. 0 Page 15 HT- 03
...
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convective heat transfer mathematical and computational modelling of viscous fluids and porous media
Ngày tải lên :
01/04/2014, 10:51
... (x-l)]
(3. 33)
q~(~) - ~-~ [0 .35 682 + o
(~-~)]
for x >> 1 since
hi ~
0, as can be seen from the system of Equations (3. 32).
FREE AND MIXED CONVECTION FLOW 89
c3~ OV 10p (c32V 02V) ...
0.7942
0.7746
0.7559
0. 738 4
0.7219
0.7065
0.6921
0.6785
0.6657
0.6 537
0.6424
0. 631 7
1.4671
1.4268
1 .39 20
1 .36 17
1 .33 47
1 .31 06
1.2897
1.2699
1.2517
1. 234 9
1.2194
1.2050
1.1915 ...
1.1915
1.1789
1.1670
1.1558
e(o)
Series (1.65)
1. 533 5
1.4815
1. 438 0
1.4010
1 .36 90
1 .34 08
1 .31 57
1.2 932
1.2728
1.2541
1. 237 0
1.2212
1.2065
1.1929
1.1801
1.1680
1.1567
25...
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fundamentals of heat and mas transfer seventh edition
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02/04/2014, 15:51
... Boundary Layers 38 2
6.2 Local and Average Convection Coefficients 38 2
6.2.1 Heat Transfer 38 2
6.2.2 Mass Transfer 38 3
6.2 .3 The Problem of Convection 38 5
6 .3 Laminar and Turbulent Flow 38 9
6 .3. 1 Laminar ... Methods 33 0
5.10.1 Discretization of the Heat Equation: The Explicit Method 33 0
5.10.2 Discretization of the Heat Equation: The Implicit Method 33 7
5.11 Summary 34 5
References 34 6
Problems 34 6
5S.1 ... Law of Cooling 525
8.2 .3 Fully Developed Conditions 525
8 .3 The Energy Balance 529
8 .3. 1 General Considerations 529
8 .3. 2 Constant Surface Heat Flux 530
8 .3. 3 Constant Surface Temperature 533
8.4...
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fundamentals of heat and mass transfer
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02/04/2014, 15:51
... 877
13. 3.2 Radiation Exchange Between Surfaces 878
13. 3 .3 The Two-Surface Enclosure 884
13. 3.4 Radiation Shields 886
13. 3.5 The Reradiating Surface 888
13. 4 Multimode Heat Transfer 8 93
13. 5 Implications ... Law of Cooling 525
8.2 .3 Fully Developed Conditions 525
8 .3 The Energy Balance 529
8 .3. 1 General Considerations 529
8 .3. 2 Constant Surface Heat Flux 530
8 .3. 3 Constant Surface Temperature 533
8.4 ... Considerations 30 2
5.6 Radial Systems with Convection 30 3
5.6.1 Exact Solutions 30 3
5.6.2 Approximate Solutions 30 4
5.6 .3 Total Energy Transfer 30 4
5.6.4 Additional Considerations 30 5
5.7 The Semi-Infinite...
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- 1
incropera fundamentals of heat and mass transfer
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02/04/2014, 15:52
... 1 .39 (Continued)
where
()
2
A DL 0.07 m 0.15 m 0. 033 m .
s
== ì = Hence,
()() ( )
22 2824444
q 4W/m K 0. 033 m 20 C 0.8 0. 033 m 5.67 10 W/m K 31 3 2 93 K
= +ì ìì ⋅ −
$
q 2.64 W 3. 33 ... c/3q dT
1
0T
i
ρ
=∀
∫∫
()
()
33 3
990 kg/m 10gal 3. 79 10 m / gal 4180J/kg K
t 33 5 295 K 4180 s
3 500 W
ìì
==
ì
<
(b) From Eq. (1.3a), the heat rate by convection from each heater ... 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...
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mass and heat transfer analysis of mass contactors and heat exchangers (cambridge series in chemical engineering)
Ngày tải lên :
02/04/2014, 15:52
... 0 521 88670 3 March 7, 2008 11:4
x Contents
3. 3 Tank-Type Heat Exchangers 67
3. 3.1 Batch Heat Exchanger 68
3. 3.2 Semibatch Heat Exchanger 68
3. 3.2.1 Mixed–Mixed Fluid Motions 69
3. 3.2.2 Mixed–Plug ... Motions 72
3. 3 .3 Continuous-Flow Tank-Type Heat Exchangers 74
3. 3 .3. 1 Mixed–Mixed Fluid Motions 74
3. 3 .3. 2 Mixed–Plug Fluid Motions 78
3. 4 Tubular Heat Exchangers 79
3. 4.1 Cocurrent Flow 81
3. 4.2 ... K
m
Estimation 31 3
7 .3 Tubular Contactors 31 6
7 .3. 1 Cocurrent Area Estimation 31 6
7 .3. 2 Cocurrent K
m
Estimation 31 8
7 .3. 3 Countercurrent Area Estimation 31 8
7 .3. 4 Countercurrent K
m
Estimation 32 0
Nomenclature...
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