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Sampson flow is defined as fluid flow through an infinitely thin orifice in the viscous flow regime for low Reynolds number. It is derived from an analytical solution to the Navier-Stokes equations. The below equation can be used to calculate the total volumetric flowrate through such an orifice: Here, is the volumetric flowrate in , is the pressure difference in Pa, is the pore diameter in m, and is the fluid's dynamic viscosity in Pa·s. The flow can also be expressed as a molecular flux as:

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  • Sampson flow (de)
  • Sampson flow (en)
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  • Als Sampson flow, nach Ralph Allen Sampson, wird in der englischsprachigen Literatur die Strömung eines Newtonschen Fluids durch eine kreisrunde Öffnung in einer dünnen Platte bei niedrigen Reynolds-Zahlen bezeichnet. Die Stärke des Volumenstroms berechnet sich nach: Dabei ist * der Volumenstrom durch die Öffnung, * der Druckabfall über die Platte, * der Radius der Öffnung und * die dynamische Viskosität des Fluids. (de)
  • Sampson flow is defined as fluid flow through an infinitely thin orifice in the viscous flow regime for low Reynolds number. It is derived from an analytical solution to the Navier-Stokes equations. The below equation can be used to calculate the total volumetric flowrate through such an orifice: Here, is the volumetric flowrate in , is the pressure difference in Pa, is the pore diameter in m, and is the fluid's dynamic viscosity in Pa·s. The flow can also be expressed as a molecular flux as: (en)
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  • Als Sampson flow, nach Ralph Allen Sampson, wird in der englischsprachigen Literatur die Strömung eines Newtonschen Fluids durch eine kreisrunde Öffnung in einer dünnen Platte bei niedrigen Reynolds-Zahlen bezeichnet. Die Stärke des Volumenstroms berechnet sich nach: Dabei ist * der Volumenstrom durch die Öffnung, * der Druckabfall über die Platte, * der Radius der Öffnung und * die dynamische Viskosität des Fluids. Diese Beziehung wurde 1891 von Sampson in seinem Aufsatz „On Stokes’s Current Function“ veröffentlicht und 1949 von R. Roscoe in seinem Aufsatz „The flow of viscous fluids round plane obstacles“ erneut hergeleitet und um einen Rechenfehler korrigiert. Der Strömungswiderstand einer Strömung durch einen Zylinder der Länge wird durch die Hagen-Poiseuille-Gleichung beschrieben. Diese berücksichtigt den Strömungswiderstand aufgrund des Ein- und Ausströmens an den Zylinderenden nicht. In guter Näherung kann man diesen Strömungswiderstand aufgrund des Ein- und Ausströmens in einen geraden Zylinder dadurch berücksichtigen, dass man zum Strömungswiderstand nach Hagen-Poiseuille den Strömungswiderstand gemäß oben aufgeführter Gleichung addiert. (de)
  • Sampson flow is defined as fluid flow through an infinitely thin orifice in the viscous flow regime for low Reynolds number. It is derived from an analytical solution to the Navier-Stokes equations. The below equation can be used to calculate the total volumetric flowrate through such an orifice: Here, is the volumetric flowrate in , is the pressure difference in Pa, is the pore diameter in m, and is the fluid's dynamic viscosity in Pa·s. The flow can also be expressed as a molecular flux as: Here, is the molecular flux in atoms/m2·sec, is the average of the pressures on either side of the orifice, is the Boltzmann constant, ( J/K), and is the absolute temperature in K. Sampson flow is the macroscopic analog of effusion flow, which describes stochastic diffusion of molecules through an orifice much smaller than the mean-free-path of the gas molecules. For pore diameters on the order of the mean-free-path of the fluid, flow will occur with contributions from the molecular regime as well as the viscous regime, obeying the dusty gas model according to the following equation: Here, is the total volumetric flowrate and is the volumetric flowrate according to the law of effusion. As it turns out, for many gasses, we notice equal contributions from molecular and viscous regimes when the pore size is significantly larger than the mean-free-path of the fluid, for nitrogen this occurs at a pore diameter of 393 nm, 6.0× larger than the mean-free-path. (en)
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