Drag reduction is highly dependent on the volume fraction distributions of microbubbles on the surface of the vessel. The more microbubbles are present, the more drag force will be reduced; The application of microbubbles does reduce drag force of the vessel. However, the drag reduction is not very sensitive to the change of microbubble size; The change of microbubble density can significantly influence the drag reduction. Moreover, the higher the microbubble density, the more the drag force will be reduced; Drag reduction is also sensitive to the initial velocity of microbubbles. Increasing microbubble initial velocity will increase drag reduction. However, the amount of drag reduction would be capped or even decrease when the initial velocity is very high, at which part of microbubbles is directly blown to the stern of the vessel.
展开▼
