Study on the atomization zones of the nozzle in the processes of material primary processing

2021 ◽  
pp. 1-8
Author(s):  
Nan Pan ◽  
Junbin Qian ◽  
Chengjun Zhao
Keyword(s):  
Axial Direction ◽  
Liquid Distribution ◽  
Primary Processing ◽  
Nozzle Injection ◽  
Injection Zone ◽  
Liquid Atomization ◽  
Whole Space ◽  
Simulation And Experiment ◽  
Jet Nozzle ◽  
Atomization Zone

It can divide the atomization effect in the direction of the nozzle axial injection into the jet area and the non-jet area by using the second crushing theory. On this basis, according to the feed liquid atomization particles discrete degree index of characteristics particle size of feed liquid atomization, it divides the injection zone into the atomization area and the diffusion area, so as to realize the axial direction of jet nozzle injection zone, atomization zone and the diffusion zone accurately. Simulation and experiment are used to verify the three zones of atomization nozzle. The division of three zones drives the study from the whole space of liquid distribution in the roller to atomization zone, clears the key zone of the roller in tobacco primary processing, and provides a basis for further work.

scholarly journals Internal Structure of a Jet Nozzle for Coalbed Methane Mining Based on Airfoil Curves

2018 ◽  
Vol 2018 ◽  
pp. 1-17
Author(s):  
Jian Chen ◽  
Liwen Guo ◽  
Yanwei Hu ◽  
Yong Chen
Keyword(s):  
Water Column ◽  
Coalbed Methane ◽  
Pressure Fluctuations ◽  
Axial Direction ◽  
Shock Pressure ◽  
Conical Nozzle ◽  
Small Pressure ◽  
Jet Nozzle ◽  
Column Pressure ◽  
Variation Rule

Based on airfoil curves that can effectively balance the rectification and drag reduction effects in flight hydrodynamics, we designed an internal streamline structure of jet nozzle for coalbed methane (CBM) mining. The three types of nozzles originating from three typical airfoil curves are compared with the conical nozzle. Results showed that the thin-type streamlined nozzle had the largest effective shock range and least radial divergence and was thus selected as the best nozzle. Moreover, the pressure distribution at the outlet of the nozzle was found to be related to the range and number of small-pressure fluctuations near the wall. A larger number of small-pressure fluctuations and a larger range caused faster pressure of the jet water column to decay along the axial direction. Rectification with a concentrated effect also slowed down the attenuation velocity of the jet-water-column pressure between the concentration point and the nozzle. The variation rule of shock pressure with range was further determined experimentally. We found that the shock pressure of jet water column initially increased within a short distance and then decreased rapidly. The effective shock range of the thin-type streamlined nozzle in air was 1.417 times that of the conical nozzle, and the effective reaming area was 1.104 times greater. Thus, the effect of reaming was effectively improved. The length of the water column at high pressure was larger than that of the conical nozzle, and the shock efficiency was relatively high.

Reactive Divided Wall Distillation Column: Simulation and Experiment of Methyl Acetate Hydrolysis

2012 ◽  
Vol 468-471 ◽  
pp. 2785-2789 ◽  
Author(s):  
Yan Wang ◽  
He Xu Ma ◽  
Huai Gong Zhu ◽  
Wei Tang
Keyword(s):  
Methyl Acetate ◽  
Distillation Column ◽  
Reactive Distillation ◽  
Molar Ratio ◽  
Reflux Ratio ◽  
Liquid Distribution ◽  
Divided Wall Column ◽  
New Process ◽  
Simulation And Experiment ◽  
Complex Technology

As a combination of divided wall column (DWC) and reactive-distillation column, the reactive divided wall distillation column is a highly complex technology that reaction and separation can occur simultaneously, which can reduce the energy consumption and decrease the costs of captial and operation. This new process was simulated with PROⅡ software and mini plant experiments were implemented. In addition, we investigated the influences of reflux ratio, liquid distribution ratio and molar ratio of ester in water on the conversion rate of methyl acetate and the purity of the product respectively. It could be seen that the trend from experiments was suitable with simulation results.

Investigation on the Bending Ratcheting Behavior of Pressurized Z2CND18.12N Stainless Steel Elbows

2013 ◽  
Vol 573 ◽  
pp. 69-75 ◽  
Author(s):  
Xiao Hui Chen ◽  
Duo Min Li ◽  
Jian Bei Zhu ◽  
Xu Chen
Keyword(s):  
Finite Element Analysis ◽  
Stainless Steel ◽  
Axial Direction ◽  
Element Analysis ◽  
Ratcheting Strain ◽  
Finite Element Analysis Simulation ◽  
Bending Load ◽  
Simulation And Experiment ◽  
Bending Loading ◽  
Hoop Direction

A series of ratcheting experiments and finite element analysis simulation under bending loading for Z2CND18.12N stainless steel elbows were carried out. Chaboche and modified Ohno-Wang model are applied to evaluate structural ratcheting response simulations. It is found that ratcheting strain initiates firstly in the hoop direction and increases in the axial direction with the increasing of loading. The Ratcheting strain rate grows with the increase of the reversed in-plane bending load or internal pressure for both specimens with different loadings. Comparison of simulation and experiment showed that modified Ohno-Wang model presented simulation more reasonably.

WRINKLING BEHAVIOR IN HYDROFORMING OF UNSYMMETRICAL TUBULAR PART

2009 ◽  
Vol 23 (06n07) ◽  
pp. 1937-1942
Author(s):  
XIAOSONG WANG ◽  
YINGXUE YAO ◽  
SHIJIAN YUAN
Keyword(s):  
Fe Simulation ◽  
Axial Stress ◽  
Tube Hydroforming ◽  
Reduction Rate ◽  
Axial Direction ◽  
Process Window ◽  
Geometrical Analysis ◽  
Tubular Part ◽  
Key Factor ◽  
Simulation And Experiment

Geometrical analysis, numerical simulation and experiment were conducted to investigate wrinkling behavior in hydroforming of unsymmetrical tubular part. The influence of wrinkle parameters on the average thickness reduction rate was demonstrated using geometrical analysis. The wrinkling process and forming results of different loading paths were analyzed especially by means of FE simulation. It is shown from the experiment and simulation results that the unsymmetrical tubular part could be formed through the method of useful wrinkles. The thickness of the sound part is not uniform along the axial direction in the forming area. The internal pressure is the key factor to form the useful wrinkle. The axial stress is near zero in the expanding zone for useful wrinkles. By the method of useful wrinkle, process window of unsymmetrical tubular part can be enlarged for tube hydroforming.

Liquid Distribution in the Axial Direction of an Inclined Triangular Micro Heat Pipe

2004 ◽  
Author(s):  
D. Sugumar ◽  
Tio Kek Kiong ◽  
B. Venkatesh ◽  
Chong Kuan Eng
Keyword(s):  
Axial Flow ◽  
Axial Direction ◽  
Maximum Point ◽  
Axial Distribution ◽  
Condenser Section ◽  
Liquid Distribution ◽  
Runge Kutta Method ◽  
Distribution Point ◽  
Use Phase ◽  
Micro Heat Pipes

Micro heat pipes (MHPs) are, essentially, miniature heat transfer devices which use phase change to transfer thermal energy. In recent years, there have been numerous proposals for their applications in cooling electronic devices. In this paper, the axial liquid distribution of a triangular MHP is investigated for the case of inclined orientation. The study is limited to the case of positive inclination, whereby the condenser section is elevated from horizontal position. In this case, the inclusion of gravity renders the governing equation unsolvable analytically, and the 4th order Runge-Kutta method has been selected to solve it numerically. The results show that for a horizontally oriented MHP, so that the effect of gravity can be neglected, the liquid distribution along the axial direction increases monotonically from the minimum value at the evaporator end to the maximum at the condenser end. However, if the MHP is positively inclined, the axial distribution of the liquid phase is changed qualitatively. While the liquid distribution still increases monotonically starting from the evaporator end, it reaches its maximum value not at the condenser end but at a certain point in the condenser section, beyond which the liquid distribution decreases monotonically. Moreover, as the angle of inclination is increased, the maximum-distribution point moves further away from the condenser end. This maximum point, where potentially flooding will first take place, results from the balance between the effects of gravity and the heat load on the MHP, the former having the propensity to move all the liquid from the condenser towards the evaporator while the latter the tendency to place more liquid in the condenser section. As the liquid distribution assumes its greatest value at the maximum point, a throat like formation appears there. This formation is detrimental to the performance of an MHP, because it hinders, and at worst may block, the axial flow of the vapor phase.

Micro Injection Molding and Strength Check of Polymer Micro-Needle

2013 ◽  
Vol 690-693 ◽  
pp. 3136-3140
Author(s):  
Ling Xue ◽  
Gang Zhou ◽  
Ya Jun Zhang ◽  
Jian Zhuang ◽  
Da Ming Wu
Keyword(s):  
Bending Strength ◽  
Flow Direction ◽  
Axial Direction ◽  
Structure Design ◽  
Simulation Software ◽  
Ansys Software ◽  
Forming Process ◽  
Ansys Analysis ◽  
Simulation And Experiment ◽  
Moldflow Simulation

A kind of medicinal polymer needle array used for skin drug delivery is proposed in this paper. The structure design, ANSYS analysis, MOLDFLOW simulation and experiment are given. The structure of the micro-needle is that the needles are distributed on a thin-walled substrate. To study the strength of the micro-needle array, ANSYS software is used to check the axial and radial stress strength. The bending strength is improved by optimizing the micro-needle geometric structure. At the same time, in view of the polymer micro-needle array forming process, MOLDFLOW simulation software is used to research the effect that melt flow direction. The results show that the needle of the polymer melts in the micro-needle the cavities flowing along the axial direction is strong. Experiments were conducted to analyze the forming of micro-needle for different polymer, and a higher accuracy polymer micro-needle array is gotten.

Simulation and Experiment on Warm Hydroforming of AZ31 Magnesium Alloy Tube

2013 ◽  
Author(s):  
Shijian Yuan ◽  
Zejun Tang ◽  
Gang Liu
Keyword(s):  
Magnesium Alloy ◽  
Internal Pressure ◽  
Axial Direction ◽  
Sine Wave ◽  
Expansion Ratio ◽  
State Graph ◽  
Alloy Tube ◽  
Different Temperatures ◽  
Simulation And Experiment ◽  
Warm Hydroforming

The wrinkling behavior of an AZ31B magnesium alloy tube was investigated by simulation at different loading paths and at different temperatures. The effects of strain rate, internal pressure and temperature on the wrinkles were studied. Stressstrain track was analyzed in the quasi-static strain state graph of the plane stress processing to explain the changing of the wrinkles’ shape, radius and wall thickness. It is shown that shape of the wrinkles wave along the axial direction keeps the sine wave character. The radius and thinning at the top zone of the wrinkles and the width of the wrinkles increased with the temperature, the internal pressure or the axial feeding. Moreover, hydro-formability of wrinkled parts was investigated and the improvement was observed. Finnally, as an application of using wrinkled parts as preform prior to the final calibration, a magnesium alloy tubular part with 50% expansion ratio was formed.

Finite Elements Analysis on the Impact Absorption Behavior of Composite Vehicle Longeron

2011 ◽  
Vol 183-185 ◽  
pp. 1913-1917
Author(s):  
Gui Fan Zhao ◽  
Zi Peng Zhang ◽  
Tso Liang Teng
Keyword(s):  
Axial Direction ◽  
Finite Elements Analysis ◽  
Composite Tube ◽  
Finite Element Software ◽  
Simulation And Experiment ◽  
New Type ◽  
Frontal Collisions ◽  
The Impact ◽  
Type Composite ◽  
Impact Absorption

In this paper, an experimental model was built in the nonlinear finite element software LS-DYNA. A metal tube wrapped fiberglass epoxy composite outside (called “composite tube” for short) was impacted in its axial direction in the simulation. The key problems about building the model were discussed later. Comparing the simulation and experiment results, we proved the validity of the model. Furthermore, we applied the material type of the composite tube to vehicle longeron, and carried on the simulation of automobile frontal collisions in LS-DYNA. The simulation results showed using the new type composite material could reduce the longeron weight to original 33.76% without lowering the safety.

Liner Material's Output Characteristics of Explosively Formed Projectiles (EFPs)

2012 ◽  
Vol 510-511 ◽  
pp. 148-155 ◽  
Author(s):  
G. Hussain ◽  
A. Hameed ◽  
P. Barton ◽  
A.Q. Malik ◽  
Mohammad Bilal Khan ◽  
...  
Keyword(s):  
Numerical Simulation ◽  
Internal Energy ◽  
Axial Direction ◽  
Shock Pressure ◽  
Maximum Difference ◽  
Liner Material ◽  
Simulation And Experiment ◽  
Output Characteristics ◽  
Velocity Pressure

The output considerations: velocity, pressure, density, internal energy, temperature and L/D ratio of explosively formed projectiles (EFPs) were investigated. The internal energy of the EFPs was inversely proportional to the density of the liner material. The shock pressure generated and its fluctuations were highest for Fe and Ta liner materials respectively. The least pressure variations were observed for Cu along its axial direction with highest length to diameter (L/D) ratio to supports deeper penetration. The maximum difference between numerical simulation and experiment was 9.7 % for Cu EFP.

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