Abstract
Interfacial hydrodynamic slippage is controlled by two factors say physical structure and chemical composition. Various studies have been conducted experimentally which try to connect the physical structure of the surface and its chemical property on the interfacial wettability. One such example is the Tunable wettability in surface-modified ZnO-based hierarchical nanostructures [2]. In which vertically aligned Nanoneedles and Nanonails were employed as a platform to determine the effect of surface structure. According to which a variation in static contact angles were observed as the cap size the nanonails constantly increased. Starting with a contact angle of 104° the contact angle first increases and then decreases, which means that the slip length first increases and then decreases. The increase in slip length reduces the drag, which has immense application in the aerodynamic field. This paper investigates the relation between the chemical wettability and aerodynamic drag by performing MD simulations of couette flow with varying fluid-surface interaction.
Highlights
The fluid drag force acting on a moving solid body in the direction of the free stream flow of the fluid is termed as aerodynamic drag in aerodynamics
A further reduction in slip length was found when the asperity shape was changed from cylindrical to square by assuring the same surface area. This effect can be explained as a result of change in contact angle which can be supported by the work done by Li et
By measuring slip length for various conditions of varying contact angles the manipulation of slip was made possible
Summary
The fluid drag force acting on a moving solid body in the direction of the free stream flow of the fluid is termed as aerodynamic drag in aerodynamics. You and Moin showed that the slip velocity present in hydrophobic surfaces could result in a significant drag reduction [1]. It could be concluded from their work that higher the slip length, higher will be the reduction in drag and rms lift. Since it is clear that slip and drag are directly related, in this work we investigate methods to manipulate slip in order to reduce drag with the help of surface modifications
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