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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...
This paper is dedicated to motion control of an unmanned water jet propelled boat. The required forces and torques to control the boat are obtained based on the 3-DOF vessel mathematic model and three typical operation modes of the boat. Then the required thrust of each water jet is determined according to desired thrust and all kinds of constraints including power limitations and mechanical constraints...
It is well known that a focus laser generate attractive and repulsive force. Focus laser induce flow of springing out droplet in water/organic solvent mixture of two-phase. We report that behavior of droplets are changed by condition of laser power focused. We observed that movement distance and initial velocity of the droplet is related to laser power. By the result of analysis, velocity which droplets...
In this paper, a novel miniature multi-mode haptic pen is developed to interact with image on mobile terminal. The haptic pen can provide two types of vibrotactile feedback by linear resonant actuator (LRAs) and piezo-ceramic actuator. It can provide passive force feedback by a miniature magnetorheological (MR) fluids damper which is designed independently. In order to obtain the features of an image,...
Electrohydrodynamic (EHD) conduction pumping technology offers an innovative way to control flow distribution in multi-scale environments. In EHD conduction, the interaction between a strong electrical field and dissociated electrolyte species generates a net body force and therefore a net flow in a dielectric fluid. EHD conduction pumps have simple designs with no moving parts, low power consumption,...
This study is focused on electroosmetic micromixer and the effects of driving force are investigated in the sense of different mixing channel width schemes. Two pairs of electrodes are mounted on the sidewalls of mixing channel to provide the required electric field. Various Numerical simulations are performed to assess the fluid flow in the presence of the electrokinetic driving force. Throughout...
This paper addresses the vibration control problem of a fuel transport system (FTS) in a nuclear power plant. The FTS transports the fuel rods in the nuclear reactor to desired locations within the fuel building. The fuel rods must be transported under water to avoid radiation leaks into the environment. It has been observed that a quick maneuver of the trolley can cause vibrations that can damage...
In this paper, we present an approach of a new surface tension formulation for Smoothed particle hydrodynamics (SPH). Our method of the surface tension formulation is decomposed into three main processes: (1) mesh smoothing, (2) surface tension computation and (3) surface tension transfer. Firstly, we exploit a Lagrangian operator to smooth an initial three-dimensional discrete interfacial surface...
Modeling of an electrically driven fluid flow system for multi-domain simulation is reported. The electrically driven actuator force is considered by an actuator component model, based on a spring-mass-damper system with force balance formulation. The fluid flow model is developed on the basis of a Kirchhoffian network which is derived from the mass transport equation. The actuator and the fluid models...
Deterministic lateral displacement (DLD) arrays containing shaped pillars have been found to be more effective in biomedical sample separation. This study aims to numerically investigate the interplay between particles and microfluidic arrays, and to find out the key factors in determining the critical size of a DLD device with shaped pillars. A new formula is thus proposed to estimate the critical...
The pectoral fin is a major source of thrust generation for fish utilizing median or paired fins (MPF) mode. Along with the pectoral fin, spanwise flexibility plays a major role in the generation of thrust. This paper investigates the effect of spanwise flexibility on propulsion performance using theoretical and experimental studies. For this study, the kinematic model of oscillating pectoral fin...
In this study, we experimentally investigated the process leading to fracture in tofu grasping by deformable fingertips filled with a fluid. In our previous papers [1, 2], we developed deformable fingertips using a rubber bag filled with a viscoelastic fluid, and presented a strategy for delicate tofu grasping without any advance knowledge about fracture. However, the predication point was close to...
A new modeling framework of an electrically driven fluid flow system for mixed-domain circuit simulation is reported. Coupling between electrical and fluidic domains is implemented by developing an organic actuator compact model. The actuator model is based on force balance spring-mass-damper system equation. Fluid compact model is derived from mass transport equation. The actuator and the fluid models...
Due to their compact and simple design, axial piston pumps are widely used in hydraulic systems. The piston/cylinder lubricating interface is one of the most critical design elements in axial piston pumps, which fulfills the bearing and sealing function simultaneously. Also it is the main source of both friction and volumetric powerloss. In order to realize the optimal design of efficient and reliable...
The isolation plugging tool is normally developed for deep water pipeline repairing. It is a mechanical structure of plugging and sealing fluid in high-pressure pipelines to make sure the pipe maintenance operation under normal transmission. In order to design control the plugging tool, the analysis of underlying flow field physics in pipeline is necessary based on the in-situ situation. The flow...
The effects of centrifugal force of oil distribution mechanism in lubrication system at high speed will impact the performance of effective flow area, and change the inflow of lubricating oil. It is needed to study the flow field characteristics inside the oil distribution mechanism. First of all, the theoretical research has been studied on it, and the theoretical flow model of oil distribution mechanism...
This paper utilizes the method of adding a mass source and a damping term into the fluid governing equation for generating and absorbing the second order stokes wave. A nonlinear mathematic model for a raft-type wave energy converter with three floaters is proposed based on the Lagrange formulation. A number of simulations are accomplished in CFD software by numerically solving the non-linear mathematical...
Deep-sea is the last part of ocean unexplored by human, which is rich not only in oil and gas resources but also in mineral and biological resources. To date, deep-sea exploration has become one of the international research focuses and frontiers. Pressure-retaining sampler is the important equipment used for collection of high-fidelity fluid samples at deep-sea, called sampler for short, which is...
For the vibration of the aero pipeline and the conveying pipeline exists universally and the vibration has effects on the pipeline life, the detection accuracy and the system stability, the research on the natural characteristic of the pipeline vibration has promising prospects. In this paper, the vibration mathematical model is built with the simple and practical Rayleigh-Ritz energy method to calculate...
Heavy forgings quality and production capacity represent an important symbol of the level of the country's industrial development. Large water press is the equipment for heavy forgings forming, and it's essential to improve the control performance of power transmission system. In this paper, the mathematical models of the key elements for fluid power transmission system, including water pump, accumulator,...
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