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Title: Flow and evaporation in single micrometer and nanometer scale pipes

We report measurements of pressure driven flow of fluids entering vacuum through a single pipe of micrometer or nanometer scale diameter. Nanopores were fabricated by etching a single ion track in polymer or mica foils. A calibrated mass spectrometer was used to measure the flow rates of nitrogen and helium through pipes with diameter ranging from 10 μm to 31 nm. The flow of gaseous and liquid nitrogen was studied near 77 K, while the flow of helium was studied from the lambda point (2.18 K) to above the critical point (5.2 K). Flow rates were controlled by changing the pressure drop across the pipe in the range 0–31 atm. When the pressure in the pipe reached the saturated vapor pressure, an abrupt flow transition was observed. A simple viscous flow model is used to determine the position of the liquid/vapor interface in the pipe. The observed mass flow rates are consistent with no slip boundary conditions.
Authors:
; ; ;  [1] ;  [2]
  1. Department of Physics and Astronomy, University of California, Irvine 92697 (United States)
  2. Department of Materials Science, GSI Helmholtzzentrum fur Schwerionenforschung GmbH, Darmstadt (Germany)
Publication Date:
OSTI Identifier:
22311155
Resource Type:
Journal Article
Resource Relation:
Journal Name: Applied Physics Letters; Journal Volume: 105; Journal Issue: 3; Other Information: (c) 2014 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; BOUNDARY CONDITIONS; ETCHING; EVAPORATION; FLOW RATE; FOILS; INTERFACES; LAMBDA POINT; MASS; MASS SPECTROMETERS; MICROSTRUCTURE; NANOSTRUCTURES; POROUS MATERIALS; PRESSURE DROP; TEMPERATURE RANGE 0000-0013 K; TEMPERATURE RANGE 0065-0273 K; VAPOR PRESSURE; VISCOUS FLOW