1. A device comprising:a block of material, the block of material defining:
a gas inlet;
a chamber in fluid communication with the gas inlet;
a throat in fluid communication with the chamber, the throat being configured to generate a supersonic flow of a gas when the gas flows through the throat;
a channel in fluid communication with the throat; and
a gas outlet in fluid communication with the channel, the channel including a ramp that is positioned proximate the gas outlet, the ramp being inclined at an angle with respect to a direction of a flow of the gas proximate a surface of the channel prior to the ramp at the gas outlet;
the chamber, the throat, and the channel being defined by a first, a second, a third, and a fourth surface, the first surface and the second surface being substantially flat surfaces and being substantially parallel to one another, and a distance between a third surface and a fourth surface defining the channel increasing from a region of the channel proximate the throat to a region proximate the gas outlet.