heliumlambda pointlayersThe thickness of the unsaturated film and the density distribution in it have been studied. While the density distribution resembles that of the inner portion of the saturated film, the thickness turns out to be much smaller. Some reasons are given for the existence of a...
(General Physics)physicsa fluid in a state characterized by a very low viscosity, high thermal conductivity, high capillarity, etc. The only known example is that of liquid helium at temperatures close to absolute zero adj (General Physics) being or relating to a superfluid ...
Viscosity of Liquid Helium below the λ-Point THE abnormally high heat conductivity of helium II below the λ-point, as first observed by Keesom, suggested to me the possibility of an explanation in terms of convection currents. This explanation would require helium II to have an ab... ...
the vapour pressure of helium-3 was thirty-five times that of helium-4 ; helium-3 was suitable for thermometry at low temperatures down to 0·5° K. and perhaps lower ; the normal boiling point of helium-3 was 3·2°K., and by extrapolation to the critical temperature the critical ...
the vapour pressure of helium-3 was thirty-five times that of helium-4 ; helium-3 was suitable for thermometry at low temperatures down to 0·5° K. and perhaps lower ; the normal boiling point of helium-3 was 3·2°K., and by extrapolation to the critical temperature the critical ...
With increasing void fraction in the flow direction comes a point where the flow transitions from bubbly to annular, wherein the bubble nucleation is suppressed, signaling transition from nucleate boiling to convective boiling. Here, under the condition of δfilm/D << 1, conduction across the thi...
For level measurement of liquid helium, a single filament of Niobium-Titanium (NbTi) is commonly used. NbTi is chosen owing to its fairly robustness and its transition temperature (Tc = 9 K), somewhat above the normal boiling point of helium [24]. For level measurement of liquid hydr...
It was found that the deterioration in dielectric strength of liquid helium in strongly inhomogeneous field conditions is much more severe than that of well-degassed transformer oil. Also, in the case of the point-plane electrode configuration, liquid helium exhibits a strong polarity effect markedly...
This experiment is crucial, as it may decide the correctnesjrof a theory devised eleven years agoto explain the peculiar properties of the fluid into which ordinary liquid helium turns when cooled below the temperature of 2·19° abs. (about two degrees below its normal boiling point of 4·...
The flow phenomena in very thin layers and narrow capillaries are discussed; it is shown that the experiments point definitely in the direction of a slip of the liquid along the wall. The maximum slipvelocity as determined from the experiments must depend on the thickness d of the layer ...