Local nanoflow field produced by the bladed rotor in a rotation transmission nanosystem in water environments

A rotation transmission nanosystem (RTnS) is an essential component of a nanomachine for transferring an input rotational frequency (ω_M) into an output frequency (ω_R) via a nanobearing. The ratio of ω_R to ω_M illustrates the rotation transmission efficiency (RTE) of the system. In this study, a bladed rotor in an RTnS is driven to rotate in a water box. Using the molecular dynamics simulation approach, the water-rotor interaction is investigated. The nanoflow field in the water box is traced. Some remarkable conclusions have been drawn for the design of the nanosystems potentially applied in a nanomachine. For example, the present rotor with uniformly assembled blades guarantees a stable rotation transmission when volume fraction of water V_f > 50%. RTE can be accurately controlled by adjusting the height of the blades. The average rotational frequency of the water cluster is much lower than that of the rotor. When 100% > V_f > 50%, the bubble has breathing vibration that produces the second-order basic frequency of the water cluster.