The Effect Of Geometry On The Velocity And Drag Force Of Catalytic Micro/Nano-Rockets

The hydrodynamic behavior of synthetic self-propelled catalytic micro/nano-rocket moving in low Reynolds number flow is studied theoretically. The inclination angle of the bubble departed from the micro/nano-rocket is related to the radius of the micro/nano-rocket. A unified formula of the drag force for cylindrical, cone-frustum and double truncated cone shapes micro/nano-rocket have been derived. The effect of geometric shapes on the velocity and the drag force is identified by comparing with three circular cross-sectional types of micro/nano-rocket. The average velocity is found to be strongly dependent on semi-cone angle, length, radius of the micro/nano-rocket, the H2O2 concentration and the drag force. This model provides a proficient explanation for propulsion mechanism of a catalytic micro/nano-rocket. This work can be used to optimize catalytic micro/nano-rockets design, which may have potential applications in biomedical and environmental engineering.