Finite Element Analysis of Heater Length in a Porous Annulus - Part B

2015 ◽  
Vol 786 ◽  
pp. 199-204
Author(s):  
Abdullah A.A.A. Al-Rashed ◽  
S.N.J. Ahmed ◽  
Ghulam Abdul Quadir ◽  
H.M.T. Khaleed ◽  
I.A. Badruddin ◽  
...  
Keyword(s):  
Finite Element ◽  
Energy Flow ◽  
Flow Behavior ◽  
Physical Parameters ◽  
Temperature Model ◽  
Element Analysis ◽  
Inner Radius ◽  
Triangular Elements ◽  
Heater Length ◽  
Two Temperature

The present study is undertaken to investigate the effect of geometrical and physical parameters on discrete heating of an annular vertical porous cylinder heated isothermally at center portion of inner radius. Finite element method is employed to convert the governing partial differential equations into matrix form of equations by employing 3 noded triangular elements. Darcy model is assumed to represent the flow behavior inside the porous medium. Two temperature model is used to describe energy flow in the medium. The study is conducted for different lengths of heater corresponding to 20%, 35% and 50% of the total height of the cylinder. It is found that the flow pattern for aspect ratio 1 is smoother than that of the 0.5.

Finite Element Analysis of Heater Length in a Porous Annulus - Part A

2015 ◽  
Vol 786 ◽  
pp. 193-198
Author(s):  
Ghulam Abdul Quadir ◽  
N.J.S Ahmed ◽  
A.A.A.A Al-Rashed ◽  
I.A. Badruddin ◽  
H.M.T. Khaleed ◽  
...  
Keyword(s):  
Finite Element ◽  
Porous Medium ◽  
Nusselt Number ◽  
Flow Behavior ◽  
Outer Radius ◽  
Element Analysis ◽  
Inner Radius ◽  
Triangular Elements ◽  
Solid Phases ◽  
Heater Length

The focus of present study is to investigate the influence of discrete heating by an isothermal heater placed at the inner radius of a vertical annular cylinder containing porous medium between its inner and the outer radius. Finite element method is used to solve the governing partial differential equations by employing 3 noded triangular elements. Darcy model is used to represent the flow behavior inside the porous medium. It is assumed that the thermal non-equilibrium condition exists between the fluid and solid phases of the porous medium. The study is conducted for different lengths of heater corresponding to 20%, 35% and 50% of the total height of the cylinder. It is found that the Nusselt number for fluid, solid phases as well as total Nusselt number initially decreases and the increases along the length of heater.

Analysis of Tribological Characteristics between Plastic and Steel Helical Gear

2011 ◽  
Vol 383-390 ◽  
pp. 2097-2102
Author(s):  
Yi Shu Hao ◽  
Bao Gang Zhang ◽  
Bei Peng
Keyword(s):  
Finite Element ◽  
Helical Gear ◽  
Low Noise ◽  
Gear Transmission ◽  
Temperature Model ◽  
Element Analysis ◽  
Vibration Absorption ◽  
Friction Heat ◽  
Element Simulation ◽  
Plastic Gears

The application of plastic gear is becoming more and more widespread due to its advantages of low noise, shock and vibration absorption and self-lubrication. Friction heat of plastic gear is an important reason for their failure, because the thermal conductivity of plastic is smaller than the metal and the heat generated by friction is an important factor for temperature rising of plastic gear. This paper established a tribology and temperature model of plastic gear transmission by the way of theoretical analysis and finite element simulation of plastic and steel helical gear transmission. The result of finite element analysis shows that friction heat of plastic gears generated during meshing is comparatively large, but the friction of plastic gear and steel gear during the process of meshing is small. The analysis conclusion, contrapose the tribological properties between plastic and steel helical gear, enriched and improved the research in this field and provided some ready-made experiences.

scholarly journals Effects of Nozzle Die Angle on Extruding Polymethylmethacrylate in Open-Source 3D Printing

2018 ◽  
Vol 15 (2) ◽  
pp. 663-665 ◽  
Author(s):  
Nor Aiman Sukindar ◽  
Mohd Khairol Anuar Mohd Ariffin ◽  
B.T. Hang Tuah Baharudin ◽  
Che Nor Aiza Jaafar ◽  
Mohd Idris Shah Ismail
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Pressure Drop ◽  
3D Printing ◽  
Open Source ◽  
Flow Behavior ◽  
Three Dimensional ◽  
3D Printer ◽  
Element Analysis ◽  
Factors Affecting

Open-source 3D printer has been widely used for fabricating three dimensional products. However, this technology has some drawbacks that need to be improved such as accuracy of the finished parts. One of the factors affecting the final product is the ability of the machine to extrude the material consistently, which is related to the flow behavior of the material inside the liquefier. This paper observes the pressure drop along the liquefier by manipulating the nozzle die angle from 80° to 170° using finite element analysis (FEA) for polymethylmethacrylate (PMMA) material. When the pressure drop along the liquefier is varied, the printed product also varies, thus providing less accuracy in the finished parts. Based on the FEA, it was found that 130° was the optimum die angle (convergent angle) for extruding PMMA material using open-source 3D printing.

Finite Element Modeling of Hybrid Friction Diffusion Welding of Tube-Tubesheet Joints

2019 ◽  
Author(s):  
Fadi Al-Badour
Keyword(s):  
Finite Element ◽  
Carbon Steel ◽  
Flow Behavior ◽  
Welding Process ◽  
Element Model ◽  
Processing Parameters ◽  
Steel Tube ◽  
Diffusion Welding ◽  
Steel Shell ◽  
Element Analysis

Abstract Hybrid Friction Diffusion Bonding (HFDB) is a solid-state welding process that proved its capability of producing sound tube-tubesheet joints, but with limitations on tube thickness (up to 1mm) and tube-tubesheet materials. In the petrochemical industry, there is a great demand for the use of carbon steel shell and tube heat exchangers. To investigate the feasibility of HFDB techniques in joining thicker tube (i.e 2.1 mm) on tubesheet joint, a three-dimensional thermo-mechanical finite element model (FEM) was developed and solved using ABAQUS (commercial finite element analysis (FEA) software). The model was used to predict the temperature distribution and developed stresses during and after welding. The model considered temperature dependent material properties while Johnson-cook model was used to govern material plastic flow behavior. In this paper,19 mm (¾ in) ASTM 179 cold-drawn carbon steel tube into an ASTM A516 Grade 70 tubesheet joints was simulated. Results are validated based on temperature measurements, which was found in good agreement with experimental results. The developed model can be used to optimize processing parameters (i.e. tool rotational speed, dwell time “holding time”, and forging force.. etc) and study their effect on material flow and developed stresses.

scholarly journals Mid Frequency Shock Response Determination by Using Energy Flow Method and Time Domain Correction

2013 ◽  
Vol 20 (5) ◽  
pp. 847-861 ◽  
Author(s):  
Sung-Hyun Woo ◽  
Jae-Hung Han
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Time Domain ◽  
Energy Flow ◽  
Practical Method ◽  
Frequency Range ◽  
Element Analysis ◽  
Flow Method ◽  
Force Signal ◽  
Structural Parts

Shock induced vibration can be more crucial in the mid frequency range where the dynamic couplings with structural parts and components play important roles. To estimate the behavior of structures in this frequency range where conventional analytical schemes, such as statistical energy analysis (SEA) and finite element analysis (FEA) methods may become inaccurate, many alternative methodologies have been tried up to date. This study presents an effective and practical method to accurately predict transient responses in the mid frequency range without having to resort to the large computational efforts. Specifically, the present study employs the more realistic frequency response functions (FRFs) from the energy flow method (EFM) which is a hybrid method combining the pseudo SEA equation (or SEA-Like equation) and modal information obtained by the finite element analysis (FEA). Furthermore, to obtain the time responses synthesized with modal characteristics, a time domain correction is practiced with the input force signal and the reference FRF on a position of the response subsystem. A numerical simulation is performed for a simple five plate model to show its suitability and effectiveness over the standard analytical schemes.

scholarly journals Changes in the stiffness of load-bearing elements of a high-rise building and inclinometer data based on finite element analysis

2021 ◽  
Vol 263 ◽  
pp. 02023
Author(s):  
Alexey Plotnikov ◽  
Mikhail Ivanov
Keyword(s):  
Finite Element Method ◽  
Finite Element ◽  
Reinforced Concrete ◽  
Automatic Monitoring ◽  
Physical Parameters ◽  
The Finite Element Method ◽  
Element Analysis ◽  
Reinforcing Bar ◽  
High Rise ◽  
Element Method

The use of monitoring techniques during the operation of a building contributes to the study of the stress-strain state of both known and newly developed structural systems. The article discusses the effect of reducing the bending stiffness of reinforced concrete crossbars of high-rise buildings on the overall deformability, which can be monitored by changing the angles of rotation at characteristic points. For the introduction into the model of the calculation based on finite elements of the physical parameters of the stiffness of reinforced concrete bending elements, the function of the change in the shoulder of a pair of forces in the section during the opening of normal cracks is given. Empirical data on changes in the stress unevenness coefficient along the length of the reinforcing bar are used. The calculation is based on the diagrammatic method. The data on the accumulated experience of measuring the angles of rotation of a building with automatic monitoring of buildings are presented. Using the finite element method, the systems were simulated with a decrease in stiffness to 0.4 from the initial one. It is shown that it is possible to select a range of sensors - angle meters - inclinometers. It has been determined that the angle of rotation can be changed up to 1.6 times. The corresponding ranges are defined for two types of frameworks: frame and frame-braced. The nature of the change in the overall stiffness of the building frame as a result of reducing the stiffness of the crossbars is shown. Calculation models based on the finite element method determined the deformation limits of the entire frame as a whole.

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