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Cavitation nozzle is the core component of cavitation generator. It promotes cavitation by its internal special structure, producing bubble and improving the impact force of jet. The structural characteristics directly affect the quality of the cavitation jet. Therefore, the study of internal structure of nozzle is helpful to improve the performance of nozzle. Based on CFD software, taking the Helmholtz...
The aim of this study is to find appropriate parameters of a trapping device, i.e. equilateral triangular microwell array, using a computational simulation. This simulation was divided into nine cases of microwell with various depths and widths to help analyze the effects of them on velocity and vorticity distribution induced inside the microwell. The microwells with equilateral length of 40, 60 and...
Polymetallic sulfide particle hydraulic lifting process was simulated with theoretical analysis and numerical calculation. Simulation goal was to obtain polymetallic sulfide particle hydraulic lifting conditions in vertical pipe and action rules between hydraulic lifting system parameters and hydraulic lifting performance. Mechanics analysis model of polymetallic sulfide particle hydraulic lifting...
Understanding the physics behind levitation and the flow field around suspended liquid droplets is key to enhancing the drying process of pharmaceuticals and food products. Here an acoustic levitator has been successfully integrated at the Advanced Photon Source for In-situ high-energy x-ray diffraction measurements on particles suspended in an acoustic field. It is demonstrated that acoustic levitation...
The three dimension micro-scale flow field in spiral groove dry gas seals(S-DGS) is simulated by using CFD software based on gas lubrication theory in this article. Effect of gas flow state on the Seal performance is analyzed under different gas film thickness. Laminar model and k-ε turbulent model are used separately to obtain the open force, leakage rate. The results show that gas pressure distribution...
In order to research the actuator principle of work, enhance its anti-vibration performance, the inertia channel semi-active suspension actuator is designed. The mechanical control model is established, the mathematical model is derived, seeks out the expression of dynamic stiffness? dynamic damping and force transmission rate. Carries on the dynamic characteristic simulation through the change inertia...
In order to qualify the anti-shock performance of shipboard equipment and simulation actual underwater explosion(UNDEX) environment, a novel dual-wave shock test machine is developed. This machine is based on the concept of hydraulic drive system and it can generate a dual-wave shock acceleration meeting the specification defined in BV043/85. This paper establishes the simulation model of the hydraulic-actuate...
According to the World Health Organization, 15 million people suffer stroke worldwide each year, of these, 5 million die and 5 million are permanently disabled. Stroke is therefore a major cause of mortality world-wide. The majority of strokes are caused by a blood clot that occludes an artery in the brain, and although thrombolytic agents such as Alteplase are used to dissolve clots that arise in...
We present a lumped-parameter dynamic model for a planar poly(dimethylsiloxane) (PDMS) micropump using in-contact, virtually zero-leakage check valves to provide critical insights into the dynamic characteristics of the planar micropump operation. The model features a single-plane microfluidic chamber sandwiched between two check valves, which allows for reliable operation and easy system integration...
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