An Experimental Study to Determine the Optimal Sizes for Ball-Valve Micropump Channel

2012 ◽  
Vol 163 ◽  
pp. 100-106 ◽  
Author(s):  
Ming Hsun Wu ◽  
Chien Mu Lai
Keyword(s):  
Experimental Study ◽  
Great Influence ◽  
Ball Valve ◽  
Back Pressure ◽  
Optimal Size ◽  
Piezoelectric Film ◽  
Inlet Channel ◽  
Outlet Channel ◽  
Optimal Angle

The geometrical configurations of ball-valve micropumps have great influence on its efficiency. In particular, the ball valve channels have great influence on the efficiency of ball-valve micropumps because the prevention of backflow directly affects the performance of ball-valve micropumps.This study used water to investigate the optimal size of channels for piezoelectric ball-valve micropumps. The results show that the optimal angle for micro ball valve seats is 30°. The piezoelectric film vibrates rapidly and the back pressure in the water outlet channel is higher than it in the water inlet channel . This phenomenon indicates that channels are optimal sizes for a distance of 0 mm in the water inlet channel and 0.3mm in the water outlet channel.

Experimental Study of Rotating Detonation Combustor Performance under Preheat and Back Pressure Operation

2017 ◽  
Author(s):  
Arnab Roy ◽  
Donald H. Ferguson ◽  
Todd Sidwell ◽  
Bridget O'Meara ◽  
Peter Strakey ◽  
...  
Keyword(s):  
Experimental Study ◽  
Back Pressure ◽  
Rotating Detonation

Experimental Study of Noise and Back Pressure for Silencer Design Characteristics

2005 ◽  
Vol 5 (7) ◽  
pp. 1292-1298 ◽  
Author(s):  
A.K.M. Mohiuddin ◽  
Mohd Rashidin Ideres ◽  
Shukri Mohd Hashim
Keyword(s):  
Experimental Study ◽  
Back Pressure ◽  
Design Characteristics

Formation of Hexagonal Monolayers by Flow of Bead Suspensions Into Flat Microchambers

2003 ◽  
Author(s):  
Markus Grumann ◽  
Patric Schippers ◽  
Michael Dobmeier ◽  
Stefan Ha¨berle ◽  
Andreas Geipel ◽  
...  
Keyword(s):  
Hydrodynamic Resistance ◽  
Inlet Channel ◽  
Cfd Simulations ◽  
Outlet Channel ◽  
Bead Diameter ◽  
Flow Through ◽  
Bioanalytical Assays ◽  
Pressure Driven Flow ◽  
Complete Process ◽  
Microfluidic Structure

To realize a highly parallel optical detection in bead-based bioanalytical assays, we investigate the hydrodynamic aggregation of bead suspensions in a hexagonally periodical monolayer by a pressure-driven flow through a microfluidic structure. This device consists of one inlet channel connected to a shallow chamber with a depth that only slightly exceeds the diameter of the beads. To enforce the aggregation of the beads, the flow leaves the chamber via outlet channels possessing a depth smaller than a bead diameter. This way the outlets act as barriers to the beads and force them to accumulate in the chamber. Benchmarking different chamber and outlet designs we found an optimum filing behavior for a rhombus-like aggregation chamber connected to a single outlet channel at the same width as the chamber. Here, the aperture angle of 60° fosters hexagonal aggregation patterns which leads to the highest packaging density. Reproducible filling ratios of more than 94% have been achieved. The rhombus-like chamber also shows the shows the smallest increase of the hydrodynamic resistance during filling and the best rinsing behavior which allows to minimize the volume of washing detergents used for a bioassay. Zones of accumulated beads redistribute the hydrodynamic flow through the device during the filling process. CFD-simulations, embedded in an iterative master-routine, are carried out to describe the complete process of filling and to assist the process of design optimization.

scholarly journals Coal Anisotropic Sorption and Permeability: An Experimental Study

Processes ◽  
2018 ◽  
Vol 6 (8) ◽  
pp. 104 ◽  
Author(s):  
Yulong Chen ◽  
Xuelong Li ◽  
Bo Li
Keyword(s):  
Experimental Study ◽  
Gas Adsorption ◽  
Great Influence ◽  
Flow Characteristics ◽  
Volumetric Strain ◽  
Bedding Plane ◽  
Gas Production ◽  
Desorption Process ◽  
Bedding Angle ◽  
Adsorption Desorption

Knowledge of the bedding plane properties of coal seams is essential for the coalbed gas production because of their great influence on the inner flow characteristics and sorption features of gas and water. In this study, an experimental study on the anisotropic gas adsorption–desorption and permeability of coal is presented. The results show that during the adsorption–desorption process, an increase in the bedding plane angle of the specimen expands the length and area of the contact surface, thereby increasing the speed and quantity of adsorption and desorption. With an increase in the bedding angle, the number of pores and cracks was found to increase together with the volumetric strain. The evolution of permeability of coal heavily depended on stress–strain stages. The permeability decreased with the increase of stress at the initial compaction and elastic deformation stages, while it increased with the increase of stress at the stages of strain-hardening, softening and residual strength. Initial permeability increased with increasing bedding angle.

Experimental Investigation of Mixing in a T-Channel for Asymmetric Inlet Conditions

2012 ◽  
Author(s):  
Manjunath Basavarajappa ◽  
John Elsnab ◽  
Susan Thomas ◽  
Timothy A. Ameel
Keyword(s):  
Experimental Investigation ◽  
Volumetric Flow Rate ◽  
Flow Regimes ◽  
Laser Induced Fluorescence ◽  
Flow Conditions ◽  
Inlet Channel ◽  
Outlet Channel ◽  
Channel Geometry ◽  
Planar Laser ◽  
Inlet Conditions

An experimental investigation of water flow in a rectangular T-channel with inner dimensions of 20 × 20 mm (inlet channel) and 20 × 40 mm (outlet mixing channel) has been conducted. The inlet Reynolds number Re, based on inlet hydraulic diameter, ranged from Re1 = 90 to 775. Inlet flow conditions were asymmetric, and inlet Re ratios of Re1/Re2 = 1.24, 1.65 and 2.45 were obtained by varying volumetric flow rate. Dynamical conditions and T-channel geometry are directly applicable to microscale mixing. Planar laser induced fluorescence (LIF) was used to characterize flow regimes and behaviors, including periodicity, in the inlet and outlet channels. Two distinct flow regimes were identified and characterized for asymmetric inlet Re. For low inlet Re, Re1 ≤ 150, and all Re1/Re2, flows were steady. For higher Re and all Re1/Re2, a jet flow regime, characterized by two counter rotating vortices and increasingly turbulent at higher Re dominated the flow in the junction. Qualitative mixing characteristics for all flow regimes, based on LIF visualizations in the outlet channel, are also presented.

Experimental Study on Delamination during Trimming of CFRP

2015 ◽  
Vol 1089 ◽  
pp. 331-336 ◽  
Author(s):  
Qing Liang Chen ◽  
Jing Wen Zhou ◽  
Xue Mei Chen ◽  
Yan Chen ◽  
Yu Can Fu
Keyword(s):  
Experimental Study ◽  
Carbon Fiber ◽  
Great Influence ◽  
Fiber Direction ◽  
Type I ◽  
Cfrp Laminates ◽  
Carbon Fiber Reinforced Plastics ◽  
Reinforced Plastics ◽  
Fiber Reinforced Plastics ◽  
Inclined Angle

Carbon fiber reinforced plastics (CFRP) laminates with different top/bottom fiber direction angle (stacking sequences of each ply) are trimmed at various workpiece inclined angles. Four types of delamination are studied and discussed. The results indicate that fiber direction has great influence on the type of delamination and the workpiece inclined angle determines the proportion of each type of delamination expect a special cast that the delamination form turns into type I/II when the workpiece inclined angle is 58.6o. Stacking sequences of each ply have great influence on the numbers of damaged plies and the 0o fiber direction ply has the ability to prevent the development of damaged ply.

Experimental Study on a Piezoelectric Energy Generator Excited by Rotating Magnets under Different Holding Conditions

2014 ◽  
Vol 620 ◽  
pp. 160-165
Author(s):  
Xian Fang Jin ◽  
Shu Yun Wang ◽  
Jun Wu Kan ◽  
Fang Sheng Huang ◽  
Jie Yu ◽  
...  
Keyword(s):  
Experimental Study ◽  
Monitoring System ◽  
Great Influence ◽  
Magnetic Coupling ◽  
Peak Voltage ◽  
Rotating Speed ◽  
Piezoelectric Energy ◽  
Speed Range ◽  
Coupling Force ◽  
Self Powered

To meet the demand of rotating mechanism for self-powered monitoring system, piezoelectric energy generator (PEG) excited by the magnetic coupling force between rotating magnet fixed on a rotator and one magnet fixed on piezo-beam under different holding condition was presented. The influence of holding conditions (both sides holding, free holding, right side holding and left side holding) and rotating speed on energy generation of the PEG was investigated experimentally. The research results show that the holding condition exerts great influence on the peak voltage and the relative optimal rotating speeds at speed range of 0 to 1200 r/min under one magnet fixed on the end of the piezo-beam and one rotating magnet. Taking a example, when the configuration mode of rotating magnet and the fixed magnet is attract, under free holding the achieved peek voltages from the PEG are 23.6/49.6/69.2V at 300/336/456 r/min respectively. When rotating magnet and the fixed magnet attracting, under left side holding the achieved peek voltages from the PEG are 32.4/33.6/29.2V and under both sides holding the achieved peek voltages from the PEG are 16.4/16.4/16.8V at 300/336/456 r/min respectively.

scholarly journals Experimental Study on Atomization of Plain Jet Injector Under High Pressure Co-Axial Air Flow

1987 ◽  
Author(s):  
Gui Xiang Yang ◽  
J. S. Chin
Keyword(s):  
Experimental Study ◽  
High Velocity ◽  
Drop Size ◽  
Air Flow ◽  
Test Chamber ◽  
Back Pressure ◽  
Air Pressure ◽  
Working Fluid ◽  
Air Velocity ◽  
Pressure Drops

An experimental study has been conducted on the effect of high back pressure on the spray characteristics of a plain jet injector under coaxial high velocity air flow. The air pressures tested range from 1 to 16 atm, the range of air velocity is 60–120 m/s, the pressure drops of injector tested are 200–2000 kpa. Working fluid is water. Injector hole diameter is 0.5 mm. The key feature of the experiment is using a convergent-divergent nozzle to maintain a high air pressure inthe test chamber and at the same time to maintain a high velocity air flow in the atomization zone. Such an experimental arrangement totally eliminates air and droplets recirculation in the test chamber and problem related to slow droplet settling in a commonly used pressurized vessel for high back pressure atomization research. The results show that SMD decreases monotonicly with the increase of back pressure or air velocity, at different air velocities, the effect of air pressure is different. The drop size distribution parameter N in Rosin-Rammler distribution decreases slightly with increase of back pressure or air velocity.

Sign in / Sign up

Export Citation Format

Share Document