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Chapter
New Calorimetric AC Loss Measurement Technique Involving Superfluid Heluim
We have developed a new calorimetric AC loss measurement facility involving superfluid helium (He II). At present, the Test of AC Loss (TACL) facility performs AC loss measurements on Cable-in-Conduit Conducto...
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Chapter
HTS Coil and Joint Development for a 5T NMR Insert Coil
A HTS coil fabrication and joint development project was undertaken to develop the technology necessary for the production of a 5 T HTS insert coil for NMR applications. A series of minicoils are being fabrica...
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Chapter
Design, Development and Testing of the JT Refrigerators For The 45-T Hybrid Magnet
The 45-T Hybrid Facility requires 1.8 K refrigeration for extended periods of time. The JT refrigeration system design is fully redundant to guarantee continuous cooling of the super-conducting magnet. Each re...
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Chapter
Localized Heat Transfer to Vertical Forced Flow Two-Phase Helium
Localized heat transfer measurements in vertical two-phase helium are reported. The test loop contains two short heat transfer sections made of 5 mm thick oxygen-free high conductivity (OFHC) copper discs. The...
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Chapter
A Continuously Cooled Mechanical Support for Cryogenic Equipment
A scheme is presented for interception of the heat flowing into a cryogenic environment, through its mechanical support. In the present method, the mechanical support is cooled continuously by means of a coola...
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Chapter
Design, Development and Testing of the Cryogenic System for the 45-T Hybrid
The cryogenic system for the 45-T Hybrid superconducting magnet employs an innovative design primarily driven by the requirement that it be a user-friendly, reliable facility. To achieve this requirement, the ...
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Chapter
Heat Transfer from Aluminum Surfaces to Pool Boiling He I
Heat transfer measurements between different aluminum surfaces and pool boiling He I at 4.21 K are reported. The samples are contained in a channel configuration similar to what might be found in a large bath ...
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Chapter
Thermal Hydraulic Characteristics of a Prototype CEA Cable-in-Conduit Conductor
The thermal hydraulic characteristics of a prototype CEA Cable-in-Conduit Conductor (CICC) have been studied in steady state and transient conditions. The supercritical helium velocity in the central channel w...
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Article
Experimental evidence of homogeneous superfluid turbulence in large-pore porous media
Experimental results are presented for counterflow and isothermal coflow through large-pore porous materials, with porosities greater than 90% and permeabilities of order 10−11 m2. Counterflow velocities ranging ...
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Chapter
An Investigation into the Performance of a Venturi in Two-Phase Helium Flow
The present paper discusses the use of venturi flow meters for measurement of vapor quality of helium two-phase flow. Tests were performed by connecting two identical venturis with 2.29 mm throat and 4.57 mm i...
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Chapter
Transient Heat Transfer in a Channel of Liquid or Supercritical Helium
Two thin-film sensors were used to measure temperatures on opposing (horizontal) surfaces of a rectangular channel, 1.3 cm long, with channel heights of 0.2, 0.94, and 2.54 mm and at pressures of 1, 2, and 3 b...
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Chapter
Cryogenic System for the 45 Tesla Hybrid Magnet
The 45 Tesla hybrid magnet system will consist of a 14 Tesla superconducting outsert magnet and a 31 Tesla water cooled insert. The magnet is planned for operation in early 1995 at the National High Magnetic F...
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Chapter and Conference Paper
Strain Dependence of Bi-2223 Tape Conductors for Application in High Field Magnets
We report preliminary results on the transport Jc of BiPb 2223/Ag tape conductors produced by the powder- in-tube method. Measurements include the temperature dependence of Jc between 4K and Tc on a variety of co...
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Article
Attenuation of second sound in bulk flowing He II
New measurements of second sound attenuation in bulk flowing He II are reported which extend to a region of higher Reynolds number. An expression for the attenuation explicitly containing the quantum vortex li...
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Chapter
Design and Performance of Forced-Flow HeII Heat Exchangers
HeII heat exchangers are used in systems requiring near absolute-zero temperatures. A unique characteristic of superfluid helium is its strong internal convection, which prevents the existence of pronounced te...
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Chapter
A Thin Film Flowmeter for use in Liquid Helium II
A novel flowmeter design has been investigated for the metering of liquid He II bulk flows in small channels. The flowmeter consists of a thin film heater with thin film temperature sensors located upstream an...
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Chapter
Pressure Drop of He II Flow Through a Porous Media
The behavior of liquid helium in porous materials continues to be of interest for the purpose of helium fluid management in a weightless environment. The present paper reports on measurements of He II pressure...
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Chapter
Characterization of a Centrifugal Pump in He II
As part of an effort to determine the feasibility of helium transfer in space a centrifugal pump was tested in He II at a variety of flow rates, pump speeds and fluid temperatures. The pump which has a straigh...
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Chapter
Application of a Square Function Heat Pulse to Forced Flow He II
The present is the third report on a series of experiments involving forced convection heat transfer in He II. A square function heat pulse is applied to the middle of a copper flow tube, 3 mm in diameter and ...
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Chapter
Metastable Heat Flow Phenomena and Droo** Pressure Differences in He II Using Multiple Channel Configurations
Superheating of liquid helium from the He II phase up to 3.0 K is demonstrated in one dimensional multiple channel configurations at pressures below the lamda point pressure. The individual channels have diame...
