Emerging topics in heat transfer: enhancement and heat exchangers
Gespeichert in:
1. Verfasser: | |
---|---|
Format: | Buch |
Sprache: | English |
Veröffentlicht: |
Southampton [u.a.]
Wit Press
2014
|
Schlagworte: | |
Online-Zugang: | Inhaltsverzeichnis Klappentext |
Beschreibung: | 396 S. Ill., graph. Darst. |
ISBN: | 1845648188 9781845648183 |
Internformat
MARC
LEADER | 00000nam a2200000 c 4500 | ||
---|---|---|---|
001 | BV041294475 | ||
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020 | |a 1845648188 |9 1-8456-4818-8 | ||
020 | |a 9781845648183 |9 978-1-84564-818-3 | ||
035 | |a (OCoLC)843811567 | ||
035 | |a (DE-599)BVBBV041294475 | ||
040 | |a DE-604 |b ger |e rakwb | ||
041 | 0 | |a eng | |
049 | |a DE-703 | ||
082 | 0 | |a 621.4025 |2 23 | |
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100 | 1 | |a Wang, Qiuwang |e Verfasser |4 aut | |
245 | 1 | 0 | |a Emerging topics in heat transfer |b enhancement and heat exchangers |c Qiuwang Wang |
264 | 1 | |a Southampton [u.a.] |b Wit Press |c 2014 | |
300 | |a 396 S. |b Ill., graph. Darst. | ||
336 | |b txt |2 rdacontent | ||
337 | |b n |2 rdamedia | ||
338 | |b nc |2 rdacarrier | ||
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999 | |a oai:aleph.bib-bvb.de:BVB01-026743393 |
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adam_text | Contents
CHAPTER
1
Gas-Side Fouling of Fin Surfaces in Exhaust Gas Recirculators
..............1
D.K.
Taf ti,
N.
Krishnamurthy
&
А. К.
Viswanathan
1
introduction
.................................................................................................1
2
Dry Soot Deposition in Fin Passages
..........................................................7
2.1
Mathematical model
...........................................................................7
2.2
Geometry and computational grid
......................................................9
2.3
Simulation conditions and postprocessing
.......................................11
2.4
Relative magnitude of particle forces at EGR conditions
................12
2.5
Results
..............................................................................................15
2.6
Expressions for the correlations
.......................................................21
3
Reduced-order modeling of fouling in EGR
.............................................21
3.1
Dry soot fouling layer characterization
............................................22
3.2
Wet soot fouling layer characterization
............................................22
3.3
Fouling layer removal
......................................................................24
3.4
Conditions
........................................................................................27
3.5
Results and discussion
......................................................................28
4
Summary and Conclusions
........................................................................33
Acknowledgments
..........................................................................................34
References
......................................................................................................34
CHAPTER
2
Heat Transfer Enhancement by Turbulent Impinging Jets
and Ribbed Channel Flows
..........................................................................39
R.S.
Amano
1
Introduction
...............................................................................................39
1.1 Impinging jet
....................................................................................39
1.2
Turbulence models
...........................................................................40
2
Experimental Study
...................................................................................42
3
Mathematical and Physical Model
............................................................44
3.1
Governing equations
........................................................................44
3.2
Near-wall turbulence models for high Reynolds
..............................46
3.3
The
k
-ε
turbulence model
................................................................46
3.4
The Reynolds stress turbulence model
.............................................47
3.5
Heat transfer model
..........................................................................50
4
Numerical Solution Procedure
..................................................................50
5
Results and Discussion
..............................................................................51
5.1
Impinging jets
..................................................................................51
5.2
Ribbed-channel flows
.......................................................................56
5.3
Large eddy simulation
......................................................................58
6
Conclusion
................................................................................................61
References
......................................................................................................62
CHAPTER
3
Heat Transfer Enhancement of a Gas Turbine Blade-Tip Wall
..............67
G. Xie
&
B.
Sunden
1 Introduction
...............................................................................................67
2
Physical Models of Eight Kinds of Tip-Cooling Concepts
.......................72
3
Computational Details
...............................................................................73
3.1
Selection of turbulence model
..........................................................73
3.2
Grid dependence
..............................................................................74
3.3
Boundary conditions
........................................................................75
4
Fluid Flow and Heat Transfer Characteristics
...........................................76
4.1
Definitions of friction factor and Nusselt number
............................76
4.2
Model validation
..............................................................................76
4.3
Flow and temperature fields
.............................................................77
4.4
Pressure drop and heat transfer
........................................................78
5
Overall Comparisons of Tip-Cooling Concepts
........................................82
6
Concluding Remarks
.................................................................................84
Acknowledgments
..........................................................................................85
Nomenclature
.................................................................................................85
References
......................................................................................................85
CHAPTER
4
Shell-and-Tube Heat Exchangers with Helical Baffles
.............................89
G. Chen,
M
Zeng,
Q.
Chen,
В.
Peng
&
Q.
Wang
1
Introduction
...............................................................................................89
2
Flow and Heat Transfer Enhancement
Mechanism of Heltxchangers
...................................................................91
2.1
Flow characteristics of helixchangers
..............................................92
2.2
Heat transfer enhancement mechanism of helixchangers
.................93
3
STHXs with Discontinuous Helical Baffles
..............................................95
3.1
Structure of the discontinuous helical baffles
..................................95
3.2
Flow and heat transfer performance
.................................................96
3.3
Shell Side Design method for STHXs
..............................................99
4
Single Shell-Pass STHXs with Continuous Helical Baffles
...................108
4.1
Structure of the Continuous Helical Baffles
..................................108
4.2
Flow and heat transfer performance of continuous
helical baffled heat exchangers
....................................................109
4.3
Maximal velocity ratio design method
..........................................112
4.4
Effect of the inlet and outlet locations
...........................................113
4.5
Applications example
....................................................................114
5
Single Shell-Pass STHXs with Combined Helical Baffles
....................117
5.1
Structure of the combined helical baffles
......................................117
5.2
Flow streamlines
...........................................................................118
5.3
Flow and heat transfer performance
..............................................119
5.4
Maximal velocity ratio
..................................................................121
6
Combined Multiple Shell-Pass STHXs with Helical Baffles
.................122
6.1
Structure of the combined multiple shell-pass SHTXs with
helical baffles
...............................................................................122
6.2
Flow and heat transfer performance
..............................................123
7
Concluding Remarks
..............................................................................125
Acknowledgments
.......................................................................................125
References
...................................................................................................126
CHAPTERS
Compact Metallic High-Temperature Heat Exchangers
.......................131
T. Ma, L
Du, H.
Liang,
D.
Zhang,
Y.
Ji,
M.
Zeng,
L·
Luo
<&
Q.
Wang
1
Introduction
............................................................................................131
2
Primary
Surface
Recuperator.................................................................
134
2.1
Numerical
investigation
of heat transfer and pressure
drop performances of CW primary surface recuperator
................134
2.2
Stress and creep analysis of CW primary surface recuperator
......145
2.3
Experimental investigation of heat transfer and pressure
drop performances of primary surface recuperator
.......................152
3
Bayonet Tube Heat Exchanger with Inner and Outer Fins
.....................159
3.1
Design of Bayonet tube heat exchanger with inner and outer fins...
159
3.2
Numerical investigation of heat transfer and pressure drop
performances of bayonet tube HTHE
...........................................161
3.3
Stress analysis of bayonet tube HTHE
..........................................168
3.4
Experimental study of pressure drop and heat transfer
performances of bayonet tube HTHE
.........................................173
4
Concluding Remarks
..............................................................................178
Acknowledgments
.......................................................................................179
CHAPTER
6
Turbulent Heat Transfer Performance of Internally
Longitudinally Finned Tubes
..............................................··...................185
A/. Lin
&
Q. W.
Wang
1
Introduction
............................................................................................185
2
Physical Model
.......................................................................................186
3
Experimental Apparatus
.........................................................................187
4
Data Reduction in Experiment
...............................................................189
5
Numerical Model for Turbulence Flow
.................................................190
5.1
Turbulence Model
...........................................................................190
6
Results and Discussion
...........................................................................192
6.1
Validation of numerical model and grid independence
...................192
6.2
Optimal ratio of blocked core-tube outer diameter to
-
outer-tube inner diameter (dJD^)
...................................................193
6.3
Effect of lateral fin profiles
.............................................................195
6.4
Effect of different longitudinal fins
.................................................199
6.5
Correlations of periodic wavy channel of internally finned tube
.... 202
7
Conclusion
.............................................................................................204
Acknowledgments
.......................................................................................205
Nomenclature
..............................................................................................205
Greek symbols
.............................................................................................206
Subscripts
....................................................................................................206
References
...................................................................................................207
CHAPTER
7
Air-Side Heat Transfer and Friction Characteristics of
Fin-and-Tube Heat Exchangers with Various Fin Types
......................211
LB.
Wang, M
Zeng,
L.
Tang
&
Q.W.
Wang
1
Introduction
............................................................................................212
2
Heat Transfer
Performances
of the Fin Patterns for Circular Tube
........213
3
Heat Transfer Performances of the Fin Patterns for Flat Tube
...............219
4
Conclusion
.............................................................................................230
Acknowledgments
.......................................................................................230
Nomenclature
..............................................................................................230
Greek symbols
.............................................................................................231
Subscripts
....................................................................................................232
References
...................................................................................................232
CHAPTER
8
High-Temperature Heat Exchanger and Decomposer Design
..............237
Y. Chen
&
V. Ponyavin
1
Introduction
............................................................................................238
1.1
1HX requirements
............................................................................239
1.2
Helium gas properties
.....................................................................242
1.3
FLiNaK properties
..........................................................................244
2
Numerical Modeling of the Baseline HTHX Designs
............................244
2.1
Design including manufacturing geometrical effects
......................247
2.2
Analytical calculations
....................................................................249
2.3
Numerical simulation of the offset strip fin heat exchanger
with no gap in flow direction (Px
= 1) ..........................................251
3
Shell and Plate HTHX and Decomposer Design
and Operation Conditions
................................................. 253
3.1
Fluid flow model validation
.......................................................,.,...255
3.2
Heat transfer
mode! validation
........................................................261
3.3
Chemical
reaction
model
validation
................................................263
3.4
Improved design with hexagonal channels
.....................................265
3.5
Calculation of heat transfer and flow features
of heat exchanger and decomposer
...............................................267
4
Modeling of Flow with Chemical Reactions
..........................................277
4.1
Geometry and boundary conditions
................................................277
4.2
Material properties
..........................................................................278
4.3
Calculation results of the baseline design
.......................................279
4.4
Parametric study of the baseline design
..........................................281
4.5
Calculation results of the alternative designs and comparison
with baseline design results
............................................................288
4.6
Stress analysis
.................................................................................288
5
Conclusions
............................................................................................295
References
...................................................................................................299
CHAPTER
9
Design Optimization and Performance Prediction of Compact
Heat Exchangers
........................................................................................301
Q. Wang, G. Xie
&
Bengt Sunden
1
Introduction
............................................................................................301
2
Design Optimization of a Plate-Fin Heat Exchanger
.............................303
2.1
Physical model
................................................................................303
2.2
Brief description of GA and optimization process
..........................304
2.3
Optimization results and discussion
................................................305
3
Performance Prediction of Tube-Fin Heat Exchangers
..........................309
3.1
Physical model and experimental database
.....................................309
3.2
Brief description of ANN
................................................................3 10
3.3
Prediction of turbulent flow and heat transfer
.................................311
3.4
Prediction of laminar flow and heat transfer
...................................313
4
Concluding Remarks
..............................................................................3 14
References
...................................................................................................315
CHAPTER
10
Flow Boiling in Small to
Microdiameter
Tubes
......................................321
M.M.
Mahmoud,
TG. Karayiannis,
&
D.B.R.
Kenning
1
Introduction
............................................................................................321
2
Applications of
Microchannels
Heat Exchangers
..................................323
2.1
Refrigeration and air conditioning
..................................................323
2.2
Electronics cooling
..........................................................................324
3
Micro scale flow boiling issues
..............................................................328
4
Experimental Facility and Data Reduction
............................................331
5
Effect of Diameter on Flow Patterns
......................................................336
6
Pressure Drop Characteristics
................................................................345
7
Heat Transfer Characteristics
.................................................................348
7.1
Heat transfer mechanism(s)
............................................................348
7.2
Effect
of system pressure................................................................
351
7.3
Effect of tube diameter
....................................................................354
7.4
Effect
of surface
characteristics
......................................................360
7.5
Flow instability...............................................................................
363
7.6
Effect
of heated length
....................................................................365
8
Heat transfer prediction
..........................................................................365
8. !
Empirical correlations
.....................................................................366
8.2
Mechanistic models
........................................................................373
9
Pressure Drop Prediction
........................................................................374
9.1
Empirical correlations
.....................................................................374
9.2
Mechanistic models
........................................................................377
10
Conclusions
............................................................................................380
Acknowledgement
.......................................................................................383
Nomenclature
..............................................................................................383
Greek symbols
.............................................................................................385
Subscripts
....................................................................................................385
References
..................................................................................................387
Emerging Topics in Heat Transfer
Enhancement and Heat Exchangers
Developments in Heat Transfer, Volume
24
Presented in ten edited chapters this book encompasses important emerging
topics in heat transfer equipment, particularly heat exchangers. The chapters
have all been selected by invitation only.
Advances in high temperature equipment and small scale devices continue to be
important as the involved heat transfer and related phenomena are often complex
in nature and different mechanisms like heat conduction, convection, turbulence,
thermal radiation and phase change as well as chemical reactions may occur
simultaneously.
The book treats various operating problems, like fouling, and highlights
applications in heat exchangers and gas turbine cooling. In engineering design
and development, reliable and accurate computational methods are required to
replace or complement expensive and time consuming experimental trial and
error work. Tremendous advancements in knowledge and competence have been
achieved during recent years due to improved computational solution methods for
non-linear partial differential equations, turbulence modelling advancement and
developments of computers and computing algorithms to achieve efficient and
rapid simulations. The chapters of the book thoroughly present such advancement
in a variety of applications.
Titles of related interest:
Introduction to Heat Transfer
Editor
B. SUNDÉN
ISBN:
978-1-84564-656-1
ełSBN:
978-1-84564-657-8
Published
2012 /
Зббрр
Advanced Computational Methods in Heat Transfer
XII
Editors:
B. SUNDÉN, CA
BREBBIA and D.
POLJAK
WIT Transactions on Engineering Sciences,
Vol
75
ISBN:
978-1-84564-602-8
elSBN:
978-1-84564-603-5
Published
2012 /
376pp
|
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spelling | Wang, Qiuwang Verfasser aut Emerging topics in heat transfer enhancement and heat exchangers Qiuwang Wang Southampton [u.a.] Wit Press 2014 396 S. Ill., graph. Darst. txt rdacontent n rdamedia nc rdacarrier Wärmeübertragung (DE-588)4064211-2 gnd rswk-swf (DE-588)4143413-4 Aufsatzsammlung gnd-content Wärmeübertragung (DE-588)4064211-2 s DE-604 Erscheint auch als Online-Ausgabe 978-1-84564-819-0 Digitalisierung UB Bayreuth - ADAM Catalogue Enrichment application/pdf http://bvbr.bib-bvb.de:8991/F?func=service&doc_library=BVB01&local_base=BVB01&doc_number=026743393&sequence=000003&line_number=0001&func_code=DB_RECORDS&service_type=MEDIA Inhaltsverzeichnis Digitalisierung UB Bayreuth - ADAM Catalogue Enrichment application/pdf http://bvbr.bib-bvb.de:8991/F?func=service&doc_library=BVB01&local_base=BVB01&doc_number=026743393&sequence=000004&line_number=0002&func_code=DB_RECORDS&service_type=MEDIA Klappentext |
spellingShingle | Wang, Qiuwang Emerging topics in heat transfer enhancement and heat exchangers Wärmeübertragung (DE-588)4064211-2 gnd |
subject_GND | (DE-588)4064211-2 (DE-588)4143413-4 |
title | Emerging topics in heat transfer enhancement and heat exchangers |
title_auth | Emerging topics in heat transfer enhancement and heat exchangers |
title_exact_search | Emerging topics in heat transfer enhancement and heat exchangers |
title_full | Emerging topics in heat transfer enhancement and heat exchangers Qiuwang Wang |
title_fullStr | Emerging topics in heat transfer enhancement and heat exchangers Qiuwang Wang |
title_full_unstemmed | Emerging topics in heat transfer enhancement and heat exchangers Qiuwang Wang |
title_short | Emerging topics in heat transfer |
title_sort | emerging topics in heat transfer enhancement and heat exchangers |
title_sub | enhancement and heat exchangers |
topic | Wärmeübertragung (DE-588)4064211-2 gnd |
topic_facet | Wärmeübertragung Aufsatzsammlung |
url | http://bvbr.bib-bvb.de:8991/F?func=service&doc_library=BVB01&local_base=BVB01&doc_number=026743393&sequence=000003&line_number=0001&func_code=DB_RECORDS&service_type=MEDIA http://bvbr.bib-bvb.de:8991/F?func=service&doc_library=BVB01&local_base=BVB01&doc_number=026743393&sequence=000004&line_number=0002&func_code=DB_RECORDS&service_type=MEDIA |
work_keys_str_mv | AT wangqiuwang emergingtopicsinheattransferenhancementandheatexchangers |