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Bubble drag reduction technology is of great significance to improve the propulsion efficiency of underwater vehicle and reduce the comprehensive energy consumption during navigation. Bubble drag reduction is a highly effective method for reducing the frictional resistance encountered by large ships and underwater vehicles during navigation. It exhibits excellent stability in drag reduction, and offers advantages such as environmental friendliness, adaptability to various flow environments, and applicability to all underwater components of ships. Therefore, it is of great significance to conduct in-depth research on bubble drag reduction and its underlying mechanisms. In this paper, the flow characteristics and the boundary bubble drag reduction mechanism of gas-liquid Couette flow in parallel wall nanochannels are studied by molecular dynamics method. The study analyzes the influences of surface wettability, wall roughness, and gas concentration on boundary slip velocity and bubble drag reduction effect. The results indicate that the bubble drag reduction effect is enhanced with the increase of boundary slip velocity. In the gas-liquid two-phase flow region, with the increase of shear velocity, the lateral deformation of boundary adsorbed bubble and boundary slip velocity increase, enhancing the bubble drag reduction effect. The increase of solid-gas interaction strength and gas concentration leads to the enrichment of gas atoms near the wall, improves the bubble spreading characteristics on the wall and thus increases the slip velocity of the solid-liquid interface. The wall roughness can change the spreading characteristics of bubble, affect the boundary slip velocity, and then change the drag reduction effect of the fluid-solid interface. As the rib height increases, gas atoms accumulate in the grooves between ribs, and the adsorption amount of gas atoms on the upper surface of the rib decreases, which leads to the decrease of the boundary slip velocity of the solid-liquid interface and ultimately reduces the drag reduction effect. The research results will provide important theoretical guidance for the boundary drag reduction technology in large ships and underwater vehicles.
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Keywords:
- bubble drag reduction /
- boundary slip /
- Couette flow /
- molecular dynamics
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