Book description
Modern technology calls increasingly for provision of cooling at cryogenic temperatures: super-conductivity research; imaging equipment for search-and-rescue; contemporary diagnostic medicine (MRI – magnetic resonance imaging); space exploration; advanced computer hardware; military defence systems. Where it is desirable to generate the cooling effect close to the point of heat removal, electrically powered Stirling and pulse-tube machines offer advantages over traditional, passive systems (Leidenfrost and Joule-Thomson).
Until now there has been no agreed approach to the thermodynamic design of either type. In particular, the choice of regenerator packing has remained a matter for time-consuming – and thus expensive – trial-and-error development. There has been no way of knowing whether an existing 'fully developed' unit is performing to the limit of its thermodynamic potential.
Stirling and Pulse-tube Cryo-coolers addresses these problems.
Features include:
An ideal cycle for the pulse-tube yielding heat, mass-flow and work;
Previously unseen phenomena of real gas behaviour;
Pictorial reliefs of pressure wave interactions;
Multiple wave reflections in graphic perspective
First solution of the 'regenerator problem ' by a full, unsteady gas dynamics treatment;
First ever depiction of pulse-tube boundary-layer events (heat conduction, 'streaming') driven by interacting left-and right-running pressure waves
First analysis of the graded regenerator and optimisation of gas path design;
Embryonic 'cook-book' method of ab initio cooler design based on dynamic similarity and thermodynamic scaling.
Stirling and Pulse-tube Cryo-coolers raises the threshold from which first-principles design of regenerative cryo-coolers may start. Those wishing to extend their study of the subject beyond the well-trodden, ideal gas/quasi-steady-state rationalisations will require this book.
Table of contents
- Cover Page
- Title Page
- Copyright
- Contents
- Preface
- Notation
- Chapter 1: Background and scope
- Chapter 2: Ideal reference cycles
- Chapter 3: Ideal Stirling cycle — real gas
- Chapter 4: Isothermal Stirling cycle with van der Waals gas
-
Chapter 5: A first model of electro-magnetic dynamics
- 5.1 Context
- 5.2 Mechanical equations of motion
- 5.3 Discretization and normalization
- 5.4 The electro-magnetic circuit
- 5.5 Gas process model
- 5.6 Regenerator pressure drop
- 5.7 Regenerator transient thermal response
- 5.8 Preparation for solution
- 5.9 Specimen simulated performance
- 5.10 Deductions from computed performance under rated operating conditions
- 5.11 Real gas effects
- 5.12 Implications for practical cooler design - update
-
Chapter 6: Towards a cook-book method of thermodynamic design
- 6.1 Background
- 6.2 The inevitability of scaling
- 6.3 Scaling principles revisited
- 6.4 Improvements in or relating to regenerator scaling
- 6.5 Similarity of working-space NTU
- 6.6 Scaling and experiment
- 6.7 Scaling in practice
- 6.8 Some realities
- 6.9 Similarity and the Stirling prime mover
- 6.10 Extension to the regenerative cryo-cooler
- 6.11 Insights from unconventional test procedures
- 6.12 Zen and the art of scaling
- Chapter 7: The Gifford low-frequency pulse-tube
- Chapter 8: Classic regenerator problem - real gas
- Chapter 9: The ultimate regenerator?
- Chapter 10: A question of streaming
-
Chapter 11: Driving function for pulse-tube events – a gas dynamics option
- 11.1 Status quo
- 11.2 A role for unsteady gas dynamics
- 11.3 Temperature-determined gas dynamics
- 11.4 Implementation
- 11.5 Application to the cryo-cooler
- 11.6 Interim implications for design
- 11.7 The equations of temperature-determined gas dynamics
- 11.8 Extension to real gas behaviour
- 11.9 Approximate wave traverse times
- 11.10 Review
- Chapter 12: Bridging the gap
- Chapter 13: A missing link
- Chapter 14: Polytropic gas dynamics – and other potential resources
-
Chapter 15: The pulse-tube cooler with ‘inertance duct’
- 15.1 Context
- 15.2 Linear wave mechanics and flow friction
- 15.3 Extension to arbitrary number of duct elements
- 15.4 A computational consideration
- 15.5 Uniform isothermal duct with friction
- 15.6 Extension to distributed temperature and unlimited number of duct elements
- 15.7 Heat exchange intensity (unlimited NTU)
- 15.8 Linear versus non-linear
- 15.9 Matters arising
- 15.10 Extension of ideal cycle to orifice and inertance line variants
- Chapter 16: Any other business
- Appendix A: Conditions for equivalence of volume variations
- Appendix B: The Ergun equation – and beyond
- Appendix C: Modified Newton–Raphson method
- References
- Name Index
- Subject Index
Product information
- Title: Stirling and Pulse-tube Cryo-coolers
- Author(s):
- Release date: January 2005
- Publisher(s): Wiley
- ISBN: 9781860584619
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