Drag reduction methods at solid-liquid interfaces

Abstract

Friction drag is a nonnegligible matter when relative motion happens between solid and liquid phase, which brings many inconveniences in ship navigation, fluid transportation, microfluid devices, etc. Thereby various methods have been developed focusing on friction drag reduction. In this article, a review of several widely studied drag reduction methods is given, specially, their advantages and limitations in practical applications are discussed. Besides, a comparison of different methods is made and the development prospect of drag reduction is concluded.

Programming Anisotropic Functionality of 3D Microdenticles by Staggered‐Overlapped and Multilayered Microarchitectures

“…In this study, the drag reduction of our artificial sharkskin was demonstrated by the synergistic effects originating from the riblet-textured geometry of the microdenticles and the hydrophobic wetting property of the PDMS-based materials (Figure 3a-e). Hydrophobic surfaces have been studied to reduce drag by air retention, even under laminar flows [36,37] with a low Reynolds number. The drag reduction was attributed to water slipping on the surface with air, which has a lower density than that of water.…”

Multistage Gradient Bioinspired Riblets for Synergistic Drag Reduction and Efficient Antifouling

“…Therefore, it was beneficial to design the composite surface with DR and antifouling abilities . Natural creatures evolving unique structures and excellent surface functions through millions of years of natural selection could adapt to the harshest environment. − Inspired by natural creatures, scientists and engineers have obtained many innovative inspirations to address the above technical challenges. − Numerous studies have indicated that many tiny denticles embedded in the shark skin and parallel to the streamwise direction played a decisive role in reducing drag and antifouling. − …”

Facile Fabrication of High‐White and Robust Superhydrophobic Ni/Al2O3 Composite Coating on Al Alloy

“…[ 7–12 ] Therefore, the superhydrophobic films demonstrate essential practical values in aircraft flight, ship navigation, and chemical production, which also brought practical improvements in safety, economy, and convenience. [ 13–15 ]…”

“…[7][8][9][10][11][12] Therefore, the superhydrophobic films demonstrate essential practical values in aircraft flight, ship navigation, and chemical production, which also brought practical improvements in safety, economy, and convenience. [13][14][15] It is well known that the preparation of superhydrophobic surfaces can be summarized in two ways: constructing micronanostructures on the surface of materials with inherent hydrophobicity or constructing micro-nanostructures on the surface of hydrophilic materials while reducing their surface energy. [16] Most common metals and alloys in daily life are hydrophilic substances, thus it is not only necessary to construct micro-nanostructures on their surfaces but also to reduce their surface energy to obtain superhydrophobic coatings.…”