19 Result(s)
within
S. W. Van Sciver
Chemistry
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Chapter
He II Heat Transport in Cylindrical Geometry
Temperature difference measurements are presented for two different sized radius cylindrical heaters, r = 1.6 and 4.8 mm, and at different radial positions in the fluid adjacent to the heater. Previous measure...
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Chapter
Measurement of the Pressure Distribution and Drag on a Sphere in Flowing Helium I and Helium II
We have designed and constructed an apparatus for measuring the pressure distribution around a sphere as a function of Reynolds number (mass flow rate) in both He I and He II. Liquid helium possesses kinematic...
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Chapter
Effect of Heat Transfer on Cooling of Current Leads
Current leads supply electrical current to high-field superconducting magnets, operating at low temperatures. The heat leak flowing down the current lead must be intercepted and extracted. In the present work,...
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Chapter
Liquid Level Control Using a Porous Plug in a Two-Phase He II System
This paper presents results of an experiment which decouples the liquid counterflow component from the evaporative component of heat transfer in the two-phase He II system. Two baths, partially filled with He ...
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Chapter
Bi-2212 Coils for 1 T Class Insert Coils
We present the construction and in-field testing of three insert coils using Bi-2212 conductor with pure silver and alloyed silver stabilizer. We use a stacked double pancake configuration, where double pancak...
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Chapter
Heat Transport in Saturated He II with Surface Heat Transfer in the Turbulent Counterflow Regime
Many large cryogenic systems provide refrigeration using pressurized He II that is cooled by a saturated bath heat exchanger. These heat exchangers consist of a closed-end tube or vessel filled with saturated ...
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Chapter
Finite Element Code for Quench and Stability Analysis of Superconducting Magnets Cooled by He II
The design of the protection system for the superconducting portion of the 45-T Hybrid Magnet System being constructed at the National High Magnetic Field Laboratory and the establishment of safe and reliable ...
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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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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...
