Li Kaikai

Jun 7, 2024 | pubs.aip.org | Mineral Resources |Zengshun Chen |Hamidreza Eivazi |Li Kaikai

Numerical simulation of nuclear magnetic resonance (NMR) can simulate experimental scenarios and quantify the impact of each factor on the physical characteristics. However, general simulation methods lack authentic pore structure information and fail to accurately model the complex geometry of rocks. High-resolution digital rock cores can effectively reflect pore structure.

Jun 4, 2024 | pubs.aip.org | Zengshun Chen |Hamidreza Eivazi |Li Kaikai

Direct numerical simulations are performed to investigate the effect of the yaw angle (α) on the drag-reduction performance by riblets in a turbulent channel flow. The yaw angles of and correspond to the riblets parallel and perpendicular to the free-stream direction, respectively. It is well known that maximum drag reduction occurs at ⁠, and the drag-reduction performance by riblets is degraded with increasing α.

Jun 4, 2024 | pubs.aip.org | Zengshun Chen |Hamidreza Eivazi |Li Kaikai

The present theory of manifold design uses a tapered header cross section to control the variations of pressure with position that result from viscous flow in the limit of vanishing inertia, otherwise known as creeping flow or Stokes flow. This approach is in contrast with prior manifold design theories that accounted for the interplay between kinetic energy and viscous pressure drop at a finite Reynolds number to produce a vanishing pressure gradient (cf. Ref. 31).

May 28, 2024 | pubs.aip.org | Li Kaikai |Zengshun Chen |Hamidreza Eivazi

An asymmetric cavity will be formed during the near-water-surface skipping motion of the disk, and an asymmetric splash is formed above the water surface at a certain angle to the water surface. Based on the characteristics of cavity evolution, the deformation of the cavity wall is defined as a “saddle,” and the cavity shape is categorized into U-shape and W-shape. The W-shaped cavity predominantly occurs when the inclined angle of the disk is large.

May 24, 2024 | pubs.aip.org | Shanghai Jiao Tong |Li Kaikai |Zengshun Chen |Hamidreza Eivazi

Topics Dimensional analysis, Thermal instruments, Exchange reactions, Associative ionization, Reaction rate constants, Recombination reactions, Chemical properties, Plasma sheaths, Computational fluid dynamics, Hypersonic flows The “communications blackout” phenomenon is caused by the plasma sheath around the hypersonic vehicle, which blocks the signal between the vehicle and the command center.