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Experimental setup scheme: circular cross-section microtube connected to two reservoirs, vacuum pump, heater, acquisition system, pressure gauges (CDG), three thermocouples, regulation valves, and high-pressure gas tanks.
Helium . (1) Initial pressure equilibrium stage. (2) Stationary transitional stage. (3) Nonstationary transitional stage. (4) Final pressure equilibrium stage.
Nitrogen . (a) Example of the pressure variation in time for and superposed the corresponding numerical fit. (b) Pressure variation in time fitting curves; each curve represents a different gas rarefaction condition. (c) Pressure-variation speed curves in time. (d) Pressure-variation speed curves logarithmic scale in time.
Thermomolecular pressure difference in function of the rarefaction parameter delta for three imposed temperature differences , 60, and . (a) Helium. (b) Nitrogen.
Mass flow rate for three imposed temperature differences , 60, and . (a) Helium in function of the rarefaction parameter . (b) Nitrogen in function of the rarefaction parameter . (c) Helium and nitrogen in function of the pressure.
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