Earlier work on the pressure gradients existing in a narrow channel through which liquid helium II is flowing has been extended by observations on the flow of liquid helium II through porous metallic membranes. Using two membranes of only slightly different flow resistance in series, it has been found that almost all the pressure drop associated with the flow occurs across the membrane of higher resistance, the flow through the membrane of lower resistance taking place under almost zero pressure gradient The phenomenon is compared with a similar effect in film flow and is interpreted in terms of a critical flow rate in liquid helium II.
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Bowers et al. (1951) studied this question.
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