Thermosyphon processes for engineering application: numerical modeling and its experimental verification
Gespeichert in:
| 1. Verfasser: | |
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| Format: | Abschlussarbeit Buch |
| Sprache: | English |
| Veröffentlicht: |
Düsseldorf
VDI-Verl.
1997
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| Ausgabe: | Als Ms. gedr. |
| Schriftenreihe: | Fortschritt-Berichte VDI
Reihe 3, Verfahrenstechnik ; 495 |
| Schlagworte: | |
| Online-Zugang: | Inhaltsverzeichnis |
| Beschreibung: | X, 115 S. graph. Darst. |
| ISBN: | 3183495031 |
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Datensatz im Suchindex
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| adam_text | Titel: Thermosyphon processes for engineering application
Autor: Wang, Chun
Jahr: 1997
FORTSCHRITTBERICHTE VM Dipl.-Ing. Chun Wang, Neubiberg Thermosyphon Processes for Engineering Application Numerical Modeling and its Experimental Verificatien Reihe 3: Verfahrenstechnik Nr. 495
TABLE OF CONTENTS _V TABLE OF CONTENTS NOMENCLATURE...............................................................................................................Vm 1 INTRODUCTION........................................................................................1 1.1 Summary of Prior Work............................................................................................3 1.1.1 Summary of Experimental Investigations.....................................................3 1.1.2 Summary of Theoretical Researches............................................................3 1.2 Two-Fluid Model for Two-Phase Flow.....................................................................6 1.2 .1 Researches and Applications of Two-Fluid Model for Two-Phase Flow.......7 1.2.2 Applications of Two-Fluid Model for Two-Phase Flow in Heat Pipes..........8 1.3 Objectives of the Present Work.................................................................................9 2 MODEL EQUATIONS AND NUMERICAL METHOD........................10 2.1 Appel’s and Fromm’s GHP Model..........................................................................10 2.2 Model Equations....................................................................................................11 2.2.1 Vapor Mass Equation................................................................................12 2.2.2 Liquid Mass Equation...............................................................................12 2.2.3 Vapor Motion Equation............................................................................12 2.2.4 Liquid Motion Equation............................................................................13 2.2.5 Vapor Energy Equation.............................................................................13 2.2.6 Liquid Energy Equation............................................................................13 2.2.7 Interfacial
Heat-Transfer Rate............................................................ 14 2.2.8 Wall Heat-Transfer Rate...........................................................................14 2.2.9 Wall Temperature Equation.......................................................................15 2.3 Numerical Method............................................................. 15 2.3.1 Control Volume Arrangement and Variable Storage..................................16 2.3.2 Discretization of the Mass Conservation Equation.....................................17 2.3.3 Discretization of the Momentum Equation................................................20 2.3 .4 Discretization of the Energy Equation.......................................................24 2.3.5 Discretization of the Wall Temperature Equation......................................28
VI TABLE OF CONTENTS 2.4 Stability-Enhancing Two-Step Method...................................................................33 2.4.1 Model of SETS.........................................................................................33 2.4.2 Discretization Equations of SETS.............................................................38 2.5 Constitutive Equations............................................................................................ 48 2.5.1 Heat-Transfer Coefficients Between Wall and Liquid.................................49 2.5.2 Heat-Transfer Coefficients Between Wall and Vapor.................................52 2.5.3 Interfacial Heat-Transfer Coefficients........................................................52 2.5.4 Wall Shear Stress......................................................................................53 2.5.5 Interfacial Shear Stress..............................................................................53 2.5.6 Interfacial Mass-Transfer...........................................................................54 2.5.7 Interphase Surface Area per Unit Volume.................................................55 2.5.8 Film Thickness..........................................................................................55 2.5.9 Heat-Transfer Wall Area of the GHP.........................................................56 2.6 Initial Conditions....................................................................................................56 2.6.1 Initial Velocity of Vapor............................................................................57 2.6.2 Initial Velocity of Liquid...........................................................................57 2.6.3 Initial Temperature of Vapor.....................................................................57 2.6.4 Initial Temperature of Wall......................................................................57
2.6.5 Initial Temperature of Liquid.....................................................................58 2.6.6 Initial Volume Fraction of Vapor and Liquid.............................................58 2.7 Boundary Conditions..............................................................................................58 2.8 Numerical Procedure...................................................... 59 2.9 Solution Algorithm.................................................................................................62 2.10 Convergence Criterion............................................................................................62 3 EXPERIMENTAL INVESTIGATION....................................................64 3.1 A Base Supporting a GHP Device...........................................................................64 3 .2 Construction of Heating and Cooling Zones............................................................67 3.3 Experimental Device...............................................................................................68 3.3.1 Arrangement of Thermocouples................................................................68 3.3.2 Employed GHP.........................................................................................69 3.3 .3 Survey about the Investigation Parameters Selected..................................70
______VII 4 RESULTS AND DISCUSSIONS...............................................................72 4.1 Temperature Distribution of the Working Fluid.......................................................72 4.2 Distribution of the Wall Temperature......................................................................73 4.3 Temperature Distribution of Liquid along the GHP................................................74 4.4 Relation between the Temperature of the Evaporator Wall and the Vapor Core......74 4.5 Axial Velocity Distribution of Vapor along the GHP...............................................75 4.6 Axial Velocity Distribution of Liquid along the GHP...............................................77 4.7 Comparison of Axial Velocity of Liquid and Vapor along the GHP........................78 4.8 Relation between Heat Flow Rate and Temperatures of Evaporator and Condenser 79 5 CONCLUSIONS.........................................................................................82 6 APPENDIX.................................................................................................84 7 REFERENCES.........................................................................................105
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| indexdate | 2024-07-09T18:10:45Z |
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| spelling | Wang, Chun Verfasser aut Thermosyphon processes for engineering application numerical modeling and its experimental verification Chun Wang Als Ms. gedr. Düsseldorf VDI-Verl. 1997 X, 115 S. graph. Darst. txt rdacontent n rdamedia nc rdacarrier Fortschritt-Berichte VDI : Reihe 3, Verfahrenstechnik 495 Zugl.: München, Univ. der Bundeswehr, Diss., 1997 Verfahrenstechnik (DE-588)4062781-0 gnd rswk-swf Wärmerohr (DE-588)4132614-3 gnd rswk-swf (DE-588)4113937-9 Hochschulschrift gnd-content Wärmerohr (DE-588)4132614-3 s Verfahrenstechnik (DE-588)4062781-0 s DE-604 Fortschritt-Berichte VDI Reihe 3, Verfahrenstechnik ; 495 (DE-604)BV001897067 495 HBZ Datenaustausch application/pdf http://bvbr.bib-bvb.de:8991/F?func=service&doc_library=BVB01&local_base=BVB01&doc_number=007736503&sequence=000001&line_number=0001&func_code=DB_RECORDS&service_type=MEDIA Inhaltsverzeichnis |
| spellingShingle | Wang, Chun Thermosyphon processes for engineering application numerical modeling and its experimental verification Fortschritt-Berichte VDI Verfahrenstechnik (DE-588)4062781-0 gnd Wärmerohr (DE-588)4132614-3 gnd |
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| title | Thermosyphon processes for engineering application numerical modeling and its experimental verification |
| title_auth | Thermosyphon processes for engineering application numerical modeling and its experimental verification |
| title_exact_search | Thermosyphon processes for engineering application numerical modeling and its experimental verification |
| title_full | Thermosyphon processes for engineering application numerical modeling and its experimental verification Chun Wang |
| title_fullStr | Thermosyphon processes for engineering application numerical modeling and its experimental verification Chun Wang |
| title_full_unstemmed | Thermosyphon processes for engineering application numerical modeling and its experimental verification Chun Wang |
| title_short | Thermosyphon processes for engineering application |
| title_sort | thermosyphon processes for engineering application numerical modeling and its experimental verification |
| title_sub | numerical modeling and its experimental verification |
| topic | Verfahrenstechnik (DE-588)4062781-0 gnd Wärmerohr (DE-588)4132614-3 gnd |
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