《燃料电池内部传热传质分析》PDF下载

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  • 作  者:袁金良著
  • 出 版 社:大连:大连海事大学出版社
  • 出版年份:2004
  • ISBN:7563217584
  • 页数:148 页
图书介绍:燃料电池是一种直接将储存在燃料(如氢气、天然气)和氧化剂(如空气中的氧气)中的化学能高效地转化为电能的发电装置。采用氢气作为燃料,其转化过程的产物为水(气或液态)和热量,对环境无任何污染。在所有种类的燃料电池中,固体电解质燃料电池(SOFC)和质子交换膜燃料电池(PEMFC)具有独特的优势和特点,被公认为21世纪重要的绿色能源。

1 INTRODUCTION 1

2 FUNDAMENTALS AND DEVELOPMENTS OF FUEL CELLS 4

2.1 FUEL CELL BASICS 5

2.2 FUEL CELL DEVELOPMENTS 6

3 TRANSPORT PROCESSES IN FUEL CELLS 9

3.1 SIMILAR TRANSPORT PROCESSES IN SOFCS AND PEMFCS 11

3.1.1 Gas transport 11

3.1.2 Electrochemical reactions 12

3.1.3 Heat transfer 13

3.1.4 Various transport processes in the electrodes(porous layers) 14

3.1.5 Other processes appearing in fuel cell components 14

3.2 ON DISSIMILARITIES OF MAIN PROCESSES IN SOFCS AND PEMFCS 15

3.2.1 Water management in PEMFCs 15

3.2.2 Fuel reforming issues in SOFCs 16

4 ANALYSIS METHODS AND EQUATIONS 18

4.1 ANALYSIS AND MODELING APPROACHES 18

4.2 MODELING DEVELOPMENTS 19

4.2.1 PEMFC modeling developments 20

4.2.2 SOFC modeling developments 21

4.2.3 Other processes/phenomena modeling relevant for fuel cells 22

4.3 PROBLEM STATEMENT AND ASSUMPTIONS 24

4.3.1 Problem statement 24

4.3.2 Analysis assumptions 25

4.4 GOVERNING EQUATIONS AND ADDITIONAL EQUATIONS 26

4.4.1 Governing equations 26

4.4.2 Additional equations 29

4.5 BOUNDARY CONDITIONS AND INTERFACIAL CONDITIONS 30

5 NUMERICAL SOLUTION PROCEDURE 32

5.1 COMPUTATIONAL FLUID DYNAMICS(CFD)APPROACHES 32

5.2 CFD CODES EMPLOYED 33

5.3 Solution Method 35

6 TRANSPORT PROCESSES IN CONVENTIONAL SOFC DESIGN 37

6.1 MASS TRANSFER EFFECTS 37

6.1.1 Fully developed gas flow and heat transfer in conventional SOFCAAs 37

6.1.2 Developing gas flow and heat transfer in conventional SOFCs 50

6.2 BUOYANCY EFFECTS 52

6.2.1 Developing velocity and temperature field 54

6.2.2 Distribution of the bottom wall spanwise Nusselt numbers 62

6.2.3 Longitudional distribution of averae f and Nusselt number 64

6.3 COMBINED EFFECTS 68

7 ANALYSIS OF TRANSPORT PROCESSES IN PEMFC DUCTS 72

7.1 GAS FLOW AND HEAT TRANSFER IN PEMFC DUCTS 73

7.1.1 Code Validation 74

7.1.2 Fluid Flow and Heat Transfer in Cathode Ducts 75

7.1.3 Fluid Flow and Heat Transfer in Anode Ducts 85

7.2 GENERAL DARCY MODEL FOR POROUS MEDIA 87

7.3 TWO-PHASE FLOW AND EFFECTS ON CELL PERFORMANCE 96

8 TRANSPORT PROCESSES IN ITSOFC ANODE DUCT 113

8.1 GAS FLOW AND HEAT TRANSFER PROCESSES 116

8.2 VARIOUS PARAMETERS'EFFECTS 121

8.3 SPECIES TRANSPORT PROCESSES 129

9 CONCLUSIONS AND FINAL REMARKS 136

APPENDIX 138

REFERENCES 142