Investigation into the Characteristic of Air Pressure Field in the Melt Blowing with Dual Slots via Numerical Simulation

2012 ◽  
Vol 538-541 ◽  
pp. 804-809 ◽  
Author(s):  
San Fa Xin ◽  
Xin Hou Wang
Keyword(s):  
Numerical Simulation ◽  
Pressure Difference ◽  
Research Method ◽  
Pressure Field ◽  
Three Dimensional ◽  
Air Pressure ◽  
Melt Blowing ◽  
Main Research

The characteristic of air pressure field in melt blowing with dual slots was studied. The main research method was the numerical simulation of three dimensional. The results show that the air pressure field is symmetric. There exist two sections: the pressure difference section and the zero-pressure difference section along the whole centerline. In the pressure difference section, there also exist three sub-sections.

Research on Pressure Field of Hydrostatic Center Rest

2013 ◽  
Vol 427-429 ◽  
pp. 262-265
Author(s):  
De Fan Zhou ◽  
Qi Hui Zhou ◽  
Xiu Li Meng ◽  
Xiao Dong Yu ◽  
Zhi Qiang Wang ◽  
...  
Keyword(s):  
Fluid Dynamics ◽  
Numerical Simulation ◽  
Computational Fluid Dynamics ◽  
Pressure Distribution ◽  
Pressure Field ◽  
Rotation Speed ◽  
Three Dimensional ◽  
Mechanical Deformation ◽  
Cavity Pressure ◽  
Distribution Law

In order to solve the mechanical deformation of the hydrostatic center rest, a numerical simulation concerning pressure field of hydrostatic center rest is studied. CFX of ANSYS has been used to compute three-dimensional pressure field of gap fluid between workpiece and bearing pillow. This research analyzes the influence of rotation speed on the bearing pressure performance according to lubricating theory and computational fluid dynamics, and it has revealed its pressure distribution law of gap oil film. Results indicate that an improved characteristic will be affected by rotation speed easily, and oil cavity pressure increases by gradually with rotation speed enhancing. The reliability of a hydrostatic center rest can be predicted through this method.

The Effect of Non-Return Nalve on Micro Injection Molding Machine

2013 ◽  
Vol 753-755 ◽  
pp. 1495-1498
Author(s):  
Rui Huan Huang ◽  
Gang Zhou ◽  
Li Qun Dong ◽  
Ya Jun Zhang
Keyword(s):  
Injection Molding ◽  
Pressure Difference ◽  
Pressure Field ◽  
Structural Parameters ◽  
Three Dimensional ◽  
Molding Machine ◽  
Micro Injection Molding ◽  
Injection Molding Machine ◽  
Injection Process ◽  
Isothermal Fluid

The micro injection molding machine (MIMM) is used to produce precision plastic products. The non-return valve (NRV) on the screw head of injection machine plays the role of preventing the melt back discharge during injection process. The sensitivity of non-return valves opening and closing affects the quality of the product. In this paper, numerical simulation of three-dimensional flow field is generalized by the Newtonian isothermal fluid method. Then, five kinds of different structural parameters of NRV are designed, and the pressure field, the pressure difference is simulated by the Polyflow software. At last, the pressure field, and the pressure difference on both side of NRV are analyzed and compared. The best structure parameter of NRV is decided. The simulation results are useful for the NRV design.

scholarly journals CFD Simulation and Experimental Study of Working Process of Screw Refrigeration Compressor with R134a

Energies ◽  
2019 ◽  
Vol 12 (11) ◽  
pp. 2054 ◽  
Author(s):  
Huagen Wu ◽  
Hao Huang ◽  
Beiyu Zhang ◽  
Baoshun Xiong ◽  
Kanlong Lin
Keyword(s):  
Numerical Simulation ◽  
Temperature Field ◽  
Cfd Simulation ◽  
Pressure Field ◽  
Fluid Pressure ◽  
Three Dimensional ◽  
Thermodynamic Characteristics ◽  
Partial Load ◽  
Twin Screw ◽  
Refrigeration Compressor

Twin-screw refrigeration compressors have been widely used in many industry applications due to their unique advantages. The performance of twin-screw refrigeration compressors is generally predicted by one-dimensional numerical simulation or empirical methods; however, the above methods cannot obtain the distribution of the fluid pressure field and temperature field inside the compressor. In this paper, a three-dimensional model was established based on the experimental twin-screw refrigeration compressor. The internal flow field of the twin-screw compressor was simulated by computational fluid dynamics (CFD) software using structured dynamic grid technology. The flow and thermodynamic characteristics of the fluid inside the compressor were analyzed. The distribution of the internal pressure field, temperature field, and velocity field in the compressor were obtained. Comparing the P-θ indicator diagram and the performance parameters of the compressor with the experimental results, it was found that the results of the three-dimensional numerical simulation were consistent with the experimental data. The maximum error was up to 2.578% on the adiabatic efficiency at the partial load working condition. The accuracy of the 3D numerical simulation of the screw compressors was validated and a new method for predicting the performance of twin-screw refrigeration compressors was presented that will be helpful in their design.

The Numerical Simulation of LCM in Dual-Scale Porous Fiber Medium Flow at Constant Pressure

2014 ◽  
Vol 543-547 ◽  
pp. 41-45
Author(s):  
Xiao Jiang Chen ◽  
Wei Chen ◽  
Yi Xing Chen ◽  
Yu Hua Zhang
Keyword(s):  
Numerical Simulation ◽  
Finite Element ◽  
Pressure Field ◽  
Constant Pressure ◽  
Control Volume ◽  
Three Dimensional ◽  
Porous Fiber ◽  
Sink Term ◽  
Control Volume Finite Element ◽  
Dual Scale

In this paper, setting up a mathematical mold for LCM filling process, which contains sink term. The control volume/finite element method is used to build finite element equation for three-dimensional preforms pressure field and get the solution. Numerical simulation of pressure field that resin flowing in three-dimensional dual-scale porous medium is achieved.

Hydrodynamic Performance of Leading-Edge Tubercle Three-Dimensional Airfoil

2012 ◽  
Vol 152-154 ◽  
pp. 1509-1515 ◽  
Author(s):  
Feng Feng ◽  
Xiang Ru Cheng ◽  
Xiang Yang Qi ◽  
Xin Chang
Keyword(s):  
Numerical Simulation ◽  
Research Method ◽  
Optimization Design ◽  
Lift Coefficient ◽  
Three Dimensional ◽  
Leading Edge ◽  
Hydrodynamic Performance ◽  
Normal Model ◽  
Edge Profile ◽  
Calculation Results

Based on RANS method, this paper studied leading-edge tubercle three-dimensional airfoil, which had effect on hydrodynamic performance of three-dimensional airfoil. Both section configurations of the two three-dimensional airfoil models were NACA0020 airfoil. The research method was numerical simulation. First, the leading-edge profile of the first airfoil model was normal. To get stalling angle of the first model, it analyzed hydrodynamic performance of the first model under different angle of attacks at Re=1.35*105. Then, the second model had a sinusoidal leading-edge profile. The second model chose the same Reynolds number. By comparison the numerical calculation results between the first and the second model, the stalling angle of second model delays 3°than the normal airfoil, and the lift coefficient of the second model increases 11.92% than the normal model. The results have laid the foundation for optimization design of leading-edge tubercle three-dimensional airfoil.

3D Numerical Simulation of the Fluidized Bed’s Cold Distributor

2011 ◽  
Vol 71-78 ◽  
pp. 2112-2115 ◽  
Author(s):  
Hui Li ◽  
Xin Hui Ma
Keyword(s):  
Fluid Dynamics ◽  
Numerical Simulation ◽  
Fluidized Bed ◽  
Field Distribution ◽  
Pressure Field ◽  
Three Dimensional ◽  
3D Numerical Simulation ◽  
Excessive Pressure ◽  
Good Advice ◽  
Computational Fluid Dynamics Cfd

Because of excessive pressure loss when the gas went through distributor in fluidized bed (FB), based on the principle and method of computational fluid dynamics (CFD), using the software, FLUENT, the inner flow field in the fluidized bed with distributor was simulated. This article analyzed the three-dimensional velocity field distribution, pressure field distribution under the different arrangement of hole form. and the good advice was given on the structural optimization of the cold distributor.

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