Abstract: A technique of generating a flow from a gas. The technique includes the steps of selecting molecules from the gas on a nanoscopic or microscopic scale, and generating the flow from the selected molecules. The gas can be air. In one embodiment, the molecules are selected based on the direction of movement of the molecules. In another embodiment, the molecules are selected based on the velocities (i.e., direction and speed) of the molecules. Also, devices that implement the technique.
Abstract: A method and device that transfers heat to or from a gas. The method includes the steps of moving a surface with sufficient speed to disrupt a velocity boundary layer for molecules of the gas in contact with the surface, and cooling or heating the surface. The surface can be a heteroscopic structure that selects molecules from the gas. Cooling results in a transfer of energy from the molecules to the surface, whereas heating results in a transfer of energy from the surface to the molecules.