Measurements of pressure gradient and temperature gradient driven flows in a rectangular channel

The objective of this experimental investigation is to characterize the gas–surface interaction under different flow conditions. Therefore, the mass flow rates driven by a pressure gradient under isothermal conditions and by only a temperature gradient under constant pressure conditions are measured in the same microchannel for five different gases: helium, neon, nitrogen, argon and krypton. The pressure driven experiments are carried out in the hydrodynamic and slip flow regimes, 0.0016<Knudsen number (Kn)<0.12, while the temperature driven experiments in the slip and transitional flow regimes have 0.05<Kn