The National Bureau of Standards Boulder Laboratories at Boulder, Colorado once again served as the host for the 1972 Cryogenic Engineering Conference. For the Cryogenic Engineering Conference it was like coming horne, for it was at the NBS Boulder Laboratories that the Cryogenic Engineering Conference was first conceived and held m 1954m connection with the dedication ofthe NBS Boulder Laboratories by President Dwight D. Eisenhower. The Cryogenic Engineering Conference IS grateful for the continuing support that the National Bureau of Standards has gIVen over the years, and which was expanded on July 1, 1971 when the NBS Boulder Laboratories assumed the secretariat function of the Conference from the National Academy of Sciences. Because of common interests in heat transfer, the 1972 Cryogemc Engineering Conference worked with the 13th National Heat Transfer Conference to develop a joint program m heat transfer. A majority ofthe papers presented in this cooperative effort are incIuded m V olume 18 of the Advances zn Cryogenic Engineerzng through the kmd permission ofthe 13th NatIOnal Heat Transfer Conference and are acknowl­ edged accordingly.

Inhalt

LNG Technology.- A-1 LNG-U. S. and Foreign Traffic-An Overview.- A-2 Cryogenic Technology and Scaleup Problems of Very Large LNG Plants.- A-3 Heat Transfer Problems in Liquefied Natural Gas Plants.- A-4 Explosive Boiling of Liquefied Hydrocarbon/Water Systems.- Heat Transfer.- B-1 Coiled Tubular Heat Exchangers.- B-2 Effects of Maldistribution on the Performance of Multistream, Multipassage Heat Exchangers.- B-3 Combined Buoyancy and Flow Direction Effects on Saturated Boiling Critical Heat Flux in Liquid Nitrogen.- B-4 Interpretation and Correlation of Deviations from a Hydrodynamic Channel Boiling Theory of Data on Nitrogen and Hydrogen in Forced and Free Flow Boiling.- B-5 Cryogenic Thermal Stratification and Interfacial Phenomena for Heated Tanks during Prolonged Orbital Flight.- B-6 Miniature Uranium Fuel Plates Cooled by Liquid Helium for Irradiation Damage Studies.- B-7 Development Program for a Liquid Methane Heat Pipe.- Insulation Systems.- C-1 Heat Transfer in Microsphere Cryogenic Insulation.- C-2 Analysis of Thermal Diffusivity Evaluation under Transient Conditions for Powder Insulations.- C-3 Lateral Heat Transfer in Cryogenic Multilayer Insulation.- C-4 An Analytical and Experimental Evaluation of Shadow Shields and Their Support Members.- Fluid Mechanics.- D-1 Liquid Flow Rates of Superfluid Helium II during Thermomechanical Pumping through Porous Media.- D-2 Helium Flow through Filters.- D-3 Choked Flow of Fluid Nitrogen with Emphasis on the Thermodynamic Critical Regions.- D-4 Geysering Inhibitor for Vertical Cryogenic Transfer Piping.- Mechanical Properties.- E-1 The Tensile Properties of Aluminum Alloys Formed at Cryogenic Temperatures.- E-2 Mechanical and Physical Properties of Several Advanced Metal-Matrix Composite Materials.- E-3 Tensile Properties of Polyurethane and Polystyrene Foams from 76 to 300 K.- E-4 Compressive Properties of Polyurethane and Polystyrene Foams from 76 to 300 K.- Thermodynamic Properties.- F-1 Development of a Method for Direct Determination of Dew Point Loci of Methane-Heavier Hydrocarbon Mixtures at Low Temperatures and Elevated Pressures.- F-2 Thermodynamic Properties of Propane: Vapor-Liquid Coexistence Curve.- F-3 Thermodynamic Properties of Propane: PVT Surface and Corresponding Thermodynamic Properties.- F-4 Cryogenic Thermal Properties from the UM Fluids Laboratory.- F-5 An Equation of State for Oxygen and Nitrogen.- F-6 Representation of PVT Data by Means of a Universal State Equation for Simple Pure Fluids.- F-7 Flory-Huggins Entropy - Effect of Liquid Expansion.- Thermal Properties.- G-1 Thermal Conductivity of Nylons and Apiezon Greases.- G-2 Thermal Conductivity Measurements of Liquid and Dense Gaseous Methane.- Instrumentation.- H-1 Cryogenic Instrumentation at and above Liquid Hydrogen Temperature-Present and Future.- H-2 Cryogenics below Liquid Hydrogen Temperature.- H-3 Temperature and Level Control in a Liquid Helium II Cryostat.- H-4 Continuous Liquid Level Measurements with Time-Domain Reflectometry.- H-5 The Cryobridge, an Automatic AC Potentiometer for Resistance Thermometry at Low Power Dissipation.- H-6 The Use of Difference Thermocouples in Cryogenic Systems.- Refrigeration.- I-1 A Combustion Heated, Thermally Actuated, Vuilleumier Refrigerator.- I-2 Selected Vuilleumier Refrigerator Performance Characteristics.- I-3 Refrigeration for the Livermore Superconducting Levitron.- I-4 Spacecraft Compatibility of Cryogenic Refrigerators.- Applied Superconductivity.- J-1 MIT-EEI Superconducting Synchronous Machine.- J-2 A 60-in.-Diameter, Levitated Superconducting Coil Thermally Shielded by Lead.- J-3 Vibration Simulation of a Space Probe Model Superconducting Energy Storage Coil.- J-4 Five-MVA Superconducting Generator Development.- J-5 Conductors for Superconducting Electrical Machines.- J-6 Thermal Conductivity of Braided Superconductor Systems.- J-7 Field and Current Measurements and Calculations in a Superconducting Tape-Wound Magnet.- J-8 Critical Current of a 50 at. % Nb-Ti Alloy As a Function of Temperature and Magnetic Field.- Atomic and Metallic Hydrogen.- K-1 Atomic Hydrogen Stabilization by High Magnetic Fields and Low Temperatures.- K-2 Penultimate Static Pressure Containment Considerations and Possible Applications to Metallic Hydrogen Preparation.- K-3 Prospects for Obtaining Metallic Hydrogen with Spherical Presses.- K-4 High-Density Hydrogen Research.- Cryo-Systems.- L-1 A New Thermal Means for Gas Separation.- L-2 Cryopumped, Condensed Hydrogen Jet Target for the National Accelerator Laboratory Main Accelerator.- L-3 Concentric Pulse Tube Analysis and Design.- L-4 Low-Temperature Nitrogen Ejector Performance.- L-5 Long-Term Cryogenic Space Storage System.- L-6 A Low-Heat-Leak, Temperature-Stabilized Support.- L-7 Helium Conservation Using Solid Nitrogen.- L-8 Clean Energy via Cryogenic Technology.- Indexes.- Author Index.