Study on Tribological Mechanism for Multi-layer Porous Structure of Diatom Frustule

Abstract

Tribological mechanism of the diatom frustule with multi-layers of pores is studied with the liquid-solid interaction (FSI) method. Based on the reconstructed representative Coscinodiscus sp. frustule with two-layer porous structure, the tribological performances for the diatom frustule at its different pore diameter ratios, pore depth ratios, and velocities are solved through governing equations involved with FSI method. The numerical result shows that the existence of the two-layer porous structure of the diatom helps to reduce the friction between it and ambient water, and to increase its ability to resist the ambient water pressure. The two-layer porous structure effectively improve the tribological performances for the diatom frustule due to the change in the frustule velocity.

Influences of operation parameters on noise of journal bearing with compound texture considering lubricant thermal effect

“…Recently, the first author of the present paper and co-workers pointed out that the compound texture with two-layer pores can more effectively improve the frictional behaviors of the tribological pair, compared with the single-layer texture. 13,14…”

“…Recently, the first author of the present paper and co-workers pointed out that the compound texture with two-layer pores can more effectively improve the frictional behaviors of the tribological pair, compared with the singlelayer texture. 13,14 Under the high speed or heavy-duty condition, frictional noise occurs in the journal bearing. Although there exist some researches on the friction noise of the journal bearing caused by the surface roughness, wear debris, etc., [15][16][17] only little work about the noise of the compound textured bearing was studied.…”

Comparative study of spherical dimple and bump effects on the tribological performances of journal bearing

“…Besides, Meng et al. 14–16 also found that the compound dimple, characterized by two-layer pores, can better improve the load-carrying capacity and reduce the friction of parallel surfaces in comparison to the simple dimple with only one-layer pore. Further, dimple effects on the tribological performances of journal bearings are also studied by researchers.…”

“…[9][10][11] By applying surface texturing to the piston ring of an engine, Meng et al 12,13 found that surface texturing can reduce the friction force and wear of the piston-ring system. Besides, Meng et al [14][15][16] also found that the compound dimple, characterized by two-layer pores, can better improve the load-carrying capacity and reduce the friction of parallel surfaces in comparison to the simple dimple with only one-layer pore. Further, dimple effects on the tribological performances of journal bearings are also studied by researchers.…”

Numerical and experimental investigation on influence of compound dimple on tribological performances for rough parallel surfaces

“…In early 2015, the first author of the present work conducted some preliminary studies on tribological performance for surfaces with cylindrical-cylindrical and rectangular-spherical dimples. The author's result showed that the two types of dimples on the inner surface of the journal bearing can generate a larger load-carrying capacity and smaller friction coefficient in comparison with the one-layer dimple (Meng et al, 2015a(Meng et al, , 2015b. However, these research works are conducted for smooth bearing surfaces.…”