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 pressure gradient under isothermal condition and by only temperature gradient under constant pressure condition are measured in the same microchannel for five different gases: helium, neon, nitrogen, argon and krypton. The pressure driven experiments are carried out in hydrodynamic and slip flow regimes, 0.0016<Kn<0.12, while the temperature driven experiments in slip and transitional flow regimes, 0.05<Kn