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Article
Apparent new phase of monolayer3He and4He films adsorbed on Grafoil as determined from heat capacity measurements
Heat capacity measurements in monolayer3He and4He films adsorbed on Grafoil at densities higher than the one corresponding to the substrate lattice registered phase show a series of sharp, narrow peaks at 1 K for...
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Chapter
Kapitza Conductance of Aluminum and Heat Transport from a Flat Surface through a Large-Diameter Tube to Saturated Helium II
Heat transport from a metal to helium II is usually determined by the thermal boundary resistance at the interface. This point is particularly noticeable if the metal is a pure low-resistivity type like alumin...
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Chapter
Boundary Resistance in Aluminum-Stabilized Conductors
The design and development of a conductor for large-scale superconductive magnetic energy storage require a unique set of specifications, which are the result of the proposed magnet design (a single-layer sole...
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Chapter
Heat Transfer to Helium-II in Cylindrical Geometries
Renewed interest in the properties of helium-II has been inspired by numerous new engineering applications for the fluid [1–3]. Of particular concern is the heat transfer behavior and its effect on the design of ...
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Chapter
Fabrication and Performance of an Aluminum-Stabilized Composite Superconductor
In a number of cases,1,2 practical superconductors have been fabricated with aluminum as the chief stabilizer. Aluminum was chosen because it is lightweight, can be readily purified to a high degree for modest co...
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Chapter
Heat Flow in He II in Microbore Channels
This paper reports measurements of the pressure and temperature differences as a function of heat flux over the length of glass microbore tubing containing He II. At low heat fluxes the fluid shows a laminar f...
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Chapter
Heat Transport in Forced Flow He II: Analytic Solution
There is considerable interest in the problem of forced flow He II particularly as it relates to the cooling of large magnet systems. The potential advantages of forced flow He II are an improved heat transpor...
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Chapter
Channel Heat Transfer in He I - Steady State Orientation Dependence
Experimental investigations of liquid helium heat transfer from a channel configuration are reported. Four model test sections are constructed each consisting of a rectangular cross section channel 127 mm in l...
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Chapter
Boiling In Saturated He II
In the present set of experiments, boiling regimes in saturated He II confined to a vertical rectangular (1 × 10 × 114 mm) channel are studied. These experiments are intended to model a cooling channel in a su...
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Chapter
Stability Measurements of a Superconductor Cooled By a Two-Dimensional Channel of Helium II
This report presents measurements on the stability of a He II cooled superconductor. The conductor is helically wound in a phenolic coil support and is cooled by a channel of He II which allows for heat transf...
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Chapter
Steady State Forced Convection Heat Transfer in He II
A study of forced convection heat transfer in superfluid helium (He II) is initiated to better understand the physical behavior of this process and to compare it with the more familiar He II heat transfer mech...
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Chapter
A Thin Film Amorphous Semiconductor Temperature Sensor
Thin film temperature sensors for use in the liquid helium temperature range have been fabricated from an amorphous semiconductor-metal alloy of germanium and copper. The amorphous material (0.5 – 1.0 µm thick...
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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...
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Chapter
Evolution of Normal Zones and Temperature in a Superconductor Cooled Internally with Helium-II
In an effort to understand the stability mechanisms of internally cooled superconductors in the He II regime, measurements are made on a hollow composite superconductor open at both ends to a bath of subcooled...
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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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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...
