In this study, a cleaning device to remove micron-sized particles on a solid surface by an air jet is developed. This device has a special nozzle containing a triangular cavity to add high intensity turbulence to the air jet, and the air jet impinges on the solid surface removing the particles. Assuming that the spherical particles are removed by rotational movement, we estimated the rotational moment induced by drag force and local pressure gradient from calculated flow field by numerical simulation. This estimation for various shape of the nozzle revealed that the nozzle with 1 mm inlet width and a rectangular interspace located under the cavity gives the best removal performance