Experimental and numerical analysis of an oil-flooded air screw expander

This article describes the results of a project whose task is to research and develop a screw expander through the inversion of a screw compressor. The article summarizes aspects of the construction of an experimental device that works with an oil-flooded air screw expander. The expander was subjected to experimental and numerical analysis, the results of which are presented in the article. Numerical analysis to examine the expansion process is performed both on the basis of the analytical geometric description of the working chamber of the expander and on the basis of the geometry obtained from a 3D scan of a real machine. The results of experimental and numerical analysis will be used to integrate an oil-flooded screw expander into an energy unit for the use of low-potential heat, for example in ORC systems.

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Thermal characterization of a plate heated by a multi-jet system

Mechanics & Industry ◽

10.1051/meca/2017064 ◽

2018 ◽

Vol 19 (5) ◽

pp. 503

Author(s):

Amar Zerrout ◽

Ali Khelil ◽

Larbi Loukarfi

Keyword(s):

Temperature Distribution ◽

Numerical Analysis ◽

Flat Plate ◽

Turbulence Model ◽

Thermal Characterization ◽

Experimental Results ◽

Experimental Device ◽

Inlet Temperature ◽

Thermal Transfer

This study is an experimental and numerical analysis of the influence from changes in the conditions of inputs temperature and velocity on the behavior thermal and dynamic of a multi-jet swirling system impacting a flat plate. The experimental device comprising three diffusers arranged in line, of diameter D aloof 2D between the axes of their centers, impinging the plate perpendicularly at an impact height H = 6D. The swirl is obtained by a generator (swirl) of composed 12 fins arranged at 60° relative to the vertical placed just at the exit of the diffuser. By imposing the temperature and velocity for three input conditions with three studied configurations. The paper deals with find the configuration that optimizes the best thermal homogenization. The results show that the configuration having an equilibrated inlet temperature (T, T, T) is derived from a good temperature distribution on the baffle wall and a better thermal transfer from the plate. The system was numerically simulated by the fluent code by using the turbulence model (k–ε). This last has yielded results accorded to those experimental results.

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Numerical analysis of stent expansion process in coronary artery stenosis with the use of non-compliant balloon

Journal of Applied Biomedicine ◽

10.1016/j.bbe.2015.10.009 ◽

2016 ◽

Vol 36 (1) ◽

pp. 145-156 ◽

Cited By ~ 14

Author(s):

Jakub Bukala ◽

Piotr Kwiatkowski ◽

Jerzy Malachowski

Keyword(s):

Coronary Artery ◽

Numerical Analysis ◽

Coronary Artery Stenosis ◽

Artery Stenosis ◽

Expansion Process ◽

Stent Expansion

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Numerical Analysis on the Expanding Process of Expandable Casing and Contact Evaluation of its Threaded Connection

Applied Mechanics and Materials ◽

10.4028/www.scientific.net/amm.378.632 ◽

2013 ◽

Vol 378 ◽

pp. 632-638

Author(s):

Xin Pu Shen ◽

Guo Yang Shen

Keyword(s):

Numerical Analysis ◽

Driving Force ◽

Equivalent Plastic Strain ◽

Expansion Process ◽

Accurate Analysis ◽

Threaded Connection ◽

Sealing Capacity ◽

Maximum Value ◽

Processing Accuracy ◽

3D Finite Element Method

A detailed analysis of the expansion process will not only provide proper estimates for processing accuracy, but will also provide critical information needed to properly design the driving force required to perform the expansion process. Furthermore, accurate analysis of the contact of the threaded connection is necessary for estimating the sealing capacity of an expandable casing section after expansion. The 3D Finite Element Method has been used to numerically simulate the expansion process fora given expandable casing section. The principal results obtained from this numerical analysis include: 1) maximum value and distribution of equivalent plastic strain after expansion within the casing, 2) deformed casing shape, 3) maximum value and distribution of contact force at contact surface between pin thread and box thread, and 4) variation in values of the driving force of the mandrel cone during the expansion process.

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Numerical analysis of asymmetrical using of actuators to membrane structure

IOP Conference Series Materials Science and Engineering ◽

10.1088/1757-899x/1209/1/012048 ◽

2021 ◽

Vol 1209 (1) ◽

pp. 012048

Author(s):

L Kapolka ◽

L Stulerova

Keyword(s):

Numerical Analysis ◽

Numerical Model ◽

Membrane Structure ◽

Experimental Device ◽

The Future

Abstract This paper is focused on the numerical analysis of an adaptive membrane structure, the model of which was created on the basis of experimental device in the lab. It was researched out the effect of asymmetric use of actuators on the membrane structure without structural loads. Results of the article describe the behaviour of numerical model. The results gained from numerical model will be compared in the future with the results measured out from the experimental device.

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The Gas Flow Simulation of Tokamak’s Inflatable Pipeline

Applied Mechanics and Materials ◽

10.4028/www.scientific.net/amm.274.378 ◽

2013 ◽

Vol 274 ◽

pp. 378-382

Author(s):

Hong Wei Zhou ◽

Yong Chen ◽

Jin Cong Wang ◽

Xiao Zhou Huang

Keyword(s):

Fluid Dynamics ◽

Numerical Analysis ◽

Finite Volume Method ◽

Finite Volume ◽

Gas Flow ◽

Flow Simulation ◽

Experimental Device ◽

Inlet Pressure ◽

Increase Rate ◽

Volume Method

Inflatable pipe is an important part of the tokamak's experimental device. This paper first introduces the composition, functions and working mode of the inflatable pipe. Then it's based on the fluid dynamics to establish model of the inflatable pipeline and the nodes. Finally, using the finite volume method to complete a numerical analysis of gas flow in the tokamak's pipeline. The results show that, if it needs to get the gas flow of the H2 that is 400 Pa•m3/s at the valve in the Pipeline, it needs to set the value of the inlet pressure that is 1.5 bar. The larger diameter of the pipeline, the more increase rate of gas flow in the pipeline.

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Experimental and Numerical Analysis of Expanded Pipe using Rigid Conical Shape

Journal of Engineering ◽

10.31026/j.eng.2018.08.09 ◽

2018 ◽

Vol 24 (8) ◽

pp. 106

Author(s):

Ahmed Ibrahim Razooqi

Keyword(s):

Plastic Deformation ◽

Finite Element ◽

Numerical Analysis ◽

Expansion Ratio ◽

Large Plastic Deformation ◽

Expansion Process ◽

Finite Element Software ◽

Conical Shape ◽

Expansion Force ◽

Good Agreement

The experimental and numerical analysis was performed on pipes suffering large plastic deformation through expanding them using rigid conical shaped mandrels, with three different cone angles (15◦, 25◦, 35◦) and diameters (15, 17, 20) mm. The experimental test for the strain results investigated the expanded areas. A numerical solution of the pipes expansion process was also investigated using the commercial finite element software ANSYS. The strains were measured for each case experimentally by stamping the mesh on the pipe after expanding, then compared with Ansys results. No cracks were generated during the process with the selected angles. It can be concluded that the strain decreased with greater angles of conical shape and an increase in expansion ratio results in an increase of expansion force and a decrease in the pipe thickness and length resulting in pipe thinning and shortening. Good agreement is evident between experimental and ANSYS results within discrepancy (16.90017%) in the X direction and (27.68698%) in the Y direction. Also, the stress distribution is investigated and it can be concluded that the case of Diameter (Do cone) = 35mm and (A) = α = 15° is the optimum.

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