Analysis and Modeling of Micro Abrasive Air Jet Cutting Aspect Ratio

2010 ◽  
Vol 126-128 ◽  
pp. 35-40
Author(s):  
Quan Lai Li ◽  
Chuan Zhen Huang ◽  
Jun Wang ◽  
Hong Tao Zhu ◽  
Zeng Wen Liu
Keyword(s):  
Experimental Investigation ◽  
Aspect Ratio ◽  
Incidence Angle ◽  
Traverse Speed ◽  
Micro Cutting ◽  
Air Jet ◽  
Analysis Technique ◽  
Major Interest ◽  
Model Predictions ◽  
Good Agreement

Micro abrasive air jet machining technology is being increasingly used in the fields of micro cutting. Since the aspect ratio is a major interest characteristics of kerf in micro cutting, an experimental investigation is carried out to study the effect of cutting process parameters on the aspect ratio in this study. It is found that the aspect ratio increases with an increase in air pressure, abrasive flow rate and jet incidence angle, while decreases with an increase in nozzle traverse speed. Furthermore a predictive model for aspect ratio is developed using the dimensional analysis technique. It is shown that the model predictions are in good agreement with the experimental results. The research results may be meaningful to efficiently control the aspect ratio.

A Study on the Cross-Sectional Shape of Kerf Cut with Micro Abrasive Air Jet

2012 ◽  
Vol 500 ◽  
pp. 236-241 ◽  
Author(s):  
Quan Lai Li ◽  
Chuan Zhen Huang ◽  
Jun Wang ◽  
Hong Tao Zhu
Keyword(s):  
Incidence Angle ◽  
Three Dimensional ◽  
Traverse Speed ◽  
Cross Sectional ◽  
Air Jet ◽  
Analysis Technique ◽  
Hard And Brittle Materials ◽  
The Cross ◽  
Sectional Profile ◽  
Sectional Shape

Micro abrasive air jet (MAAJ) cutting is a promising technology for the fabrication of three-dimensional microstructures in hard and brittle materials. In this paper, a study on the cross-sectional shape of the kerf cut with MAAJ is presented. It shows that the machining depth and slope of the sidewall increase with an increase in air pressure, abrasive flow rate and jet incidence angle, while decrease with an increase in nozzle traverse speed. Using a dimensional analysis technique, predictive model for cross-sectional profile is developed. The research results may be meaningful to the highly precision three-dimensional micro-structural cutting.

scholarly journals Design of biomimetic fibrillar interfaces: 1. Making contact

2004 ◽  
Vol 1 (1) ◽  
pp. 23-33 ◽  
Author(s):  
N. J. Glassmaker ◽  
A. Jagota ◽  
C.-Y. Hui ◽  
J. Kim
Keyword(s):  
Simple Model ◽  
Aspect Ratio ◽  
Quantitative Model ◽  
Surface Forces ◽  
Contact Behaviour ◽  
Model Predictions ◽  
Contact Surfaces ◽  
Contact Experiments ◽  
Good Agreement

This paper explores the contact behaviour of simple fibrillar interfaces designed to mimic natural contact surfaces in lizards and insects. A simple model of bending and buckling of fibrils shows that such a structure can enhance compliance considerably. Contact experiments on poly(dimethylsiloxane) (PDMS) fibrils confirm the model predictions. Although buckling increases compliance, it also reduces adhesion by breaking contact between fibril ends and the substrate. Also, while slender fibrils are preferred from the viewpoint of enhanced compliance, their lateral collapse under the action of surface forces limits the aspect ratio achievable. We have developed a quantitative model to understand this phenomenon, which is shown to be in good agreement with experiments.

Transient Behavior of a Springless Flapper Valve: Closing Motion

1998 ◽  
Vol 120 (3) ◽  
pp. 678-684
Author(s):  
K. A. Temple ◽  
V. W. Goldschmidt ◽  
J. D. Jones
Keyword(s):  
Experimental Data ◽  
Experimental Investigation ◽  
Simultaneous Measurement ◽  
Transient Behavior ◽  
Analytical Investigation ◽  
Closing Time ◽  
Model Predictions ◽  
Good Agreement

The closing of a springless flapper valve was investigated in order to gain a better understanding of the transient behavior of the valve. An experimental investigation included simultaneous measurement of pressure and flapper velocity. An analytical investigation included the development of a model to predict the closing of the flapper valve. The flapper closing was experimentally determined to require from 18 to 24 percent of a cycle, and the model predictions were in good agreement with experimental data for the flapper closing time. The present study should be a useful contribution to future modeling of flapper valves and other springless valves.

Heat and mass transfer in wood composite panels during hot pressing: Part 4. Experimental investigation and model validation

Holzforschung ◽  
2007 ◽  
Vol 61 (1) ◽  
pp. 83-88 ◽  
Author(s):  
Chunping Dai ◽  
Changming Yu ◽  
Changyan Xu ◽  
Guangbo He
Keyword(s):  
Mass Transfer ◽  
Experimental Investigation ◽  
Heat And Mass Transfer ◽  
Core Temperature ◽  
Hot Pressing ◽  
Gas Pressure ◽  
Wood Composite ◽  
The Core ◽  
Model Predictions ◽  
Good Agreement

Abstract The effects of panel density and strand size on the temperature and gas pressure inside strand mats during hot pressing has been experimentally investigated. The results show good agreement with model predictions. Strand dimensions have a strong effect on the core temperature and gas pressure when the mat/panel density is relatively high. At lower density, the temperature and gas pressure are controlled only by the panel density. Comparison between the model predictions and experimental results also reveals the need for further characterisation of the basic mat properties, especially conductivity and permeability.

An Experimental Study on the Kerf Characteristics of Silicon Cut with Micro Abrasive Air Jet

2010 ◽  
Vol 135 ◽  
pp. 13-17 ◽  
Author(s):  
Quan Lai Li ◽  
Chuan Zhen Huang ◽  
Jun Wang ◽  
Hong Tao Zhu ◽  
Zeng Wen Liu
Keyword(s):  
Experimental Study ◽  
Incidence Angle ◽  
Three Dimensional ◽  
Cutting Parameters ◽  
Traverse Speed ◽  
Parameters Optimization ◽  
Air Jet ◽  
Hard And Brittle Materials ◽  
Definition Of ◽  
Cutting Parameters Optimization

Micro abrasive air jet (MAAJ) cutting technology is being increasingly used in the precision machining of hard and brittle materials, due to its distinct advantages of negligible heat effect zone and small cutting force. In this paper, an experimental study on the kerf characteristics, especially for the effect of cutting parameters on the top edge definition, is presented. It shows that the top kerf edge is straight but not sharp. The top edge definition of the kerf improves with a decrease in the air pressure, while the effect of abrasive flow rate and nozzle traverse speed are hardly discernible. The optimum jet incidence angle for highest top edge definition of the kerf is 60°. The results of this paper may be useful for the cutting parameters optimization in the precision three-dimensional micro-structural machining.

Experimental investigation and modelling of light scattering in a-Si:H solar cells deposited on glass/ZnO:Al substrates

2002 ◽  
Vol 715 ◽  
Author(s):  
J. Krc ◽  
M. Zeman ◽  
O. Kluth ◽  
F. Smole ◽  
M. Topic
Keyword(s):  
Surface Roughness ◽  
Experimental Investigation ◽  
Solar Cells ◽  
Angular Distribution ◽  
Light Scattering ◽  
Optical Model ◽  
Distribution Functions ◽  
Interface Roughness ◽  
Scattering Parameters ◽  
Good Agreement

AbstractThe descriptive scattering parameters, haze and angular distribution functions of textured ZnO:Al transparent conductive oxides with different surface roughness are measured. An approach to determine the scattering parameters of all internal interfaces in p-i-n a-Si:H solar cells deposited on the glass/ZnO:Al substrates is presented. Using the determined scattering parameters as the input parameters of the optical model, a good agreement between the measured and simulated quantum efficiencies of the p-i-n a-Si:H solar cells with different interface roughness is achieved.

scholarly journals Quantitative Shape-Classification of Misfitting Precipitates during Cubic to Tetragonal Transformations: Phase-Field Simulations and Experiments

Materials ◽  
2021 ◽  
Vol 14 (6) ◽  
pp. 1373
Author(s):  
Yueh-Yu Lin ◽  
Felix Schleifer ◽  
Markus Holzinger ◽  
Na Ta ◽  
Birgit Skrotzki ◽  
...  
Keyword(s):  
Aspect Ratio ◽  
Phase Field ◽  
Phase Field Model ◽  
Invariant Moments ◽  
Plane Normal ◽  
Plane Shape ◽  
Formation And Evolution ◽  
The Given ◽  
Good Agreement

The effectiveness of the mechanism of precipitation strengthening in metallic alloys depends on the shapes of the precipitates. Two different material systems are considered: tetragonal γ′′ precipitates in Ni-based alloys and tetragonal θ′ precipitates in Al-Cu-alloys. The shape formation and evolution of the tetragonally misfitting precipitates was investigated by means of experiments and phase-field simulations. We employed the method of invariant moments for the consistent shape quantification of precipitates obtained from the simulation as well as those obtained from the experiment. Two well-defined shape-quantities are proposed: (i) a generalized measure for the particles aspect ratio and (ii) the normalized λ2, as a measure for shape deviations from an ideal ellipse of the given aspect ratio. Considering the size dependence of the aspect ratio of γ′′ precipitates, we find good agreement between the simulation results and the experiment. Further, the precipitates’ in-plane shape is defined as the central 2D cut through the 3D particle in a plane normal to the tetragonal c-axes of the precipitate. The experimentally observed in-plane shapes of γ′′-precipitates can be quantitatively reproduced by the phase-field model.

Experimental investigation on tilt stabilizing effect of external toroidal field in low aspect ratio tokamak

1997 ◽  
Vol 4 (2) ◽  
pp. 315-322 ◽  
Author(s):  
A. Morita ◽  
Y. Ono ◽  
M. Katsurai ◽  
M. Yamada ◽  
S. Yoshikawa
Keyword(s):  
Experimental Investigation ◽  
Aspect Ratio ◽  
Toroidal Field ◽  
Low Aspect Ratio ◽  
Stabilizing Effect

scholarly journals Experimental Investigation of Tandem Blade Cascades With Double-Circular ARC Profiles

1985 ◽  
Author(s):  
Wu Guochuan ◽  
Zhuang Biaonan ◽  
Guo Bingheng
Keyword(s):  
Experimental Investigation ◽  
Reynolds Number ◽  
Mach Number ◽  
Total Pressure ◽  
Incidence Angle ◽  
Axial Direction ◽  
Geometrical Parameters ◽  
Optimal Conditions ◽  
Turning Angle ◽  
Circular Arc

24 double circular are tandem blade cascades of three different chord-ratios were investigated under different displacements in peripheral and axial direction. The inlet Mach number was 0.3. The Reynolds number based on blade chord was 2.7×105. The characteristics of the tandem blade cascades, such as the dependence of turning angle and coefficient of total pressure loss on incidence angle were obtained. The ranges of main geometrical parameters under optimal conditions were recommended.

Modeling of Free Vertical Turbulent Diffusion Flames

1991 ◽  
Author(s):  
M. A. Gadalla ◽  
M. A. R. Sharif
Keyword(s):  
Temperature Distribution ◽  
Turbulent Diffusion ◽  
Diffusion Flames ◽  
Turbulent Diffusion Flame ◽  
Jet Mixing ◽  
Turbulent Diffusion Flames ◽  
Air Jet ◽  
Annular Jet ◽  
Fuel Jet ◽  
Model Predictions

Abstract A mathematical/empirical model compatible with the jet mixing theory for predicting the flow field properties, flame envelope, temperature distribution, and flame heights around a free vertical axi-symmetric turbulent diffusion flame has been developed. The model considers the effects of buoyancy force and the relative angle between the reactant jets. The flames are issued from a burner which consists of a central air jet and an annular fuel (commercial butane) jet. The annular jet is issued either vertically or at an angle to the flame axis. Experiments were performed earlier to measure the temperature distribution and concentration of carbon dioxide and oxygen in such flames. Three angular positions of the annular fuel jet and nine burner geometries were investigated. The model predictions in similar configurations are found to be in fair agreement with the experimental data.

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