A New Approach to Gas Flow in Capillary Systems

1953 ◽  
Vol 57 (1) ◽  
pp. 35-40 ◽  
Author(s):  
R. M. Barrer
Keyword(s):  
Gas Flow ◽  
New Approach

A New Modeling Approach to Reacting Dispersed Flow in Smelting Cyclones

2000 ◽  
Author(s):  
M. Modigell ◽  
M. Weng
Keyword(s):  
Experimental Data ◽  
Flow Field ◽  
Gas Flow ◽  
Equilibrium Calculation ◽  
New Approach ◽  
Reaction Progress ◽  
Numeric Simulation ◽  
Thermodynamic Equilibrium Calculation ◽  
Simulation Results ◽  
Comparison With Experimental Data

Abstract The present paper proposes a new approach to analyse the conversion of complexly composed particles that are dispersed in a cyclone gas flow at high temperatures. The numeric simulation of flow field and particle trajectories is coupled with a thermodynamic equilibrium calculation which describes the particle reaction progress. First simulation results and the comparison with experimental data are shown in this paper.

Self-Oscillating Microcantilever Piezoresistive Flow Sensor

2006 ◽  
Vol 326-328 ◽  
pp. 1347-1350
Author(s):  
Jeung Sang Go ◽  
Bo Sung Shin ◽  
Jong Soo Ko
Keyword(s):  
Gas Flow ◽  
Printed Circuit Board ◽  
Fluid Velocity ◽  
Flow Sensor ◽  
Circuit Board ◽  
Flow Induced Vibration ◽  
Peak Voltage ◽  
New Approach ◽  
Inlet Velocity ◽  
Microfabrication Technology

This article presents a new approach to measure the fluid velocity using the flow-induced vibration of a microcantilever. The gas flow sensor was fabricated using the microfabrication technology and mounted on a printed circuit board for experimental evaluation. For signal processing, a Wheastone bridge circuit was prepared. The experimental measurement of the fluid velocity was performed in the wind tunnel. The flow-induced vibration of the microcantilever was firstly visualized. Based on the power spectrum analysis, the vibrating frequency was constant at 1.173 kHz, independently of the inlet velocity. It is completely different from the conventional flow-induced vibration proportional to the inlet velocity. The peak-to-peak voltage outputs corresponding to the air velocities of 3, 4, 5 and 6 m/s were measured.

Modeling Pneumatic Conveyor Duct Wear: A New Approach

2005 ◽  
Author(s):  
Prem Chand ◽  
A. C. Saha ◽  
Prafull Chand
Keyword(s):  
Heat Transfer ◽  
Mass Transfer ◽  
Material Flow ◽  
Gas Flow ◽  
Gas Mixture ◽  
New Approach ◽  
Flow Phenomenon ◽  
Transfer Processes ◽  
Flow Through ◽  
Difficult Situations

It was shown in one of our recent works [1] that, the apparently disconnected items like solid-gas flow phenomenon, duct wear and particle degradation are in fact beautifully connected involving all the three components of transfer processes — heat transfer, mass transfer and momentum transfer. This paper which basically is an extension of our work on Fluid Energy Mill [2] aims at predicting duct wear while transporting solids-gas mixture in pneumatic conveyor even in most difficult situations like flow through bends under interference situation. The paper elaborates the methodology used for wear prediction and highlights the effect of several parameters like material flow rate etc. on the nature and extent of the duct wear.

scholarly journals Green and Sustainable Manufacture of Ultrapure Engineered Nanomaterials

Nanomaterials ◽  
2020 ◽  
Vol 10 (3) ◽  
pp. 466
Author(s):  
David Ortiz de Zárate ◽  
Carlos García-Meca ◽  
Elena Pinilla-Cienfuegos ◽  
José A. Ayúcar ◽  
Amadeu Griol ◽  
...  
Keyword(s):  
Mass Production ◽  
Gas Flow ◽  
Colloidal Stability ◽  
Cost Effective ◽  
Engineered Nanomaterials ◽  
Ag Nps ◽  
Au Nanoclusters ◽  
New Approach ◽  
Technological Barrier ◽  
Shape Controlled

Nanomaterials with very specific features (purity, colloidal stability, composition, size, shape, location…) are commonly requested by cutting-edge technologic applications, and hence a sustainable process for the mass-production of tunable/engineered nanomaterials would be desirable. Despite this, tuning nano-scale features when scaling-up the production of nanoparticles/nanomaterials has been considered the main technological barrier for the development of nanotechnology. Aimed at overcoming these challenging frontier, a new gas-phase reactor design providing a shorter residence time, and thus a faster quenching of nanoclusters growth, is proposed for the green, sustainable, versatile, cost-effective, and scalable manufacture of ultrapure engineered nanomaterials (ranging from nanoclusters and nanoalloys to engineered nanostructures) with a tunable degree of agglomeration, composition, size, shape, and location. This method enables: (1) more homogeneous, non-agglomerated ultrapure Au-Ag nanoalloys under 10 nm; (2) 3-nm non-agglomerated ultrapure Au nanoclusters with lower gas flow rates; (3) shape-controlled Ag NPs; and (4) stable Au and Ag engineered nanostructures: nanodisks, nanocrosses, and 3D nanopillars. In conclusion, this new approach paves the way for the green and sustainable mass-production of ultrapure engineered nanomaterials.

A New Approach for Folding Process Modeling of Passage Airbag

2014 ◽  
Vol 635-637 ◽  
pp. 564-567
Author(s):  
Guo Qing Liu ◽  
Guo Hong Xie ◽  
Zhen Shan Cui
Keyword(s):  
Process Modeling ◽  
Process Simulation ◽  
Gas Flow ◽  
Particle Method ◽  
Test Results ◽  
Minimum Area ◽  
New Approach ◽  
Folding Process ◽  
Flattening Process ◽  
Shape And Size

A new Passage Airbag (PAB) folding method which integrates simulation folding and manual folding is presented. Determining how to get a multi-layer 2D surface is vital to PAB folding. By means of 3D PAB flattening process simulation, 2D surface with a minimum area loss is created. This method avoids the traditional measurement of real PAB to obtain 2D airbag with inaccurate shape and size. After flattening PAB simulation, the 2D surfaces are meshed with respect to the predefined folding lines. The subsequent folding steps of flat 2D airbag are carried out according to the folding requirements. Finally, the reference geometry meshing and folded airbag are obtained accurately and rapidly. The static PAB deployment test is modeled using particle method for gas flow to validate this folding method. Good correlation between simulation and test results during early deployment phase of airbag is achieved. It has proven the effectiveness and feasibility of this PAB folding method.

A new approach for chemical reaction simulation of rarefied gas flow by DSMC method

2016 ◽  
Vol 140 ◽  
pp. 111-121 ◽  
Author(s):  
Ramin Zakeri ◽  
Ramin Kamali-Moghadam ◽  
Mahmoud Mani
Keyword(s):  
Chemical Reaction ◽  
Gas Flow ◽  
Rarefied Gas ◽  
Rarefied Gas Flow ◽  
Dsmc Method ◽  
New Approach

A New Approach for a Low-Cooled Ceramic Nozzle Vane

1996 ◽  
Author(s):  
C. Gutmann ◽  
A. Schulz ◽  
S. Wittig
Keyword(s):  
Gas Flow ◽  
Systematic Approach ◽  
Ceramic Materials ◽  
Shell Structures ◽  
Structural Behaviour ◽  
Precise Description ◽  
New Approach ◽  
Thermally Induced ◽  
Hot Gas ◽  
Ceramic Components

At the Institute for Thermal Turbomachinery, University of Karlsruhe (ITS) a new methodology for designing thermally loaded ceramic components based on numerical analyses of the thermal and structural behaviour is developed. Major issues are an effective optimization of the geometry and an assessment of the load. To reduce thermally induced stresses in shell structures exposed to hot gas flow a precise description of the major influencing parameters is required. Based on these relations a thermal optimization of the component is possible. Moreover, the compensation of thermal strains and the adjustment of local stiffnesses for reducing the tensile stresses and the failure probability has to be considered. In designing a first stage vane of a stationary gas turbine the proposed guidelines are verified. The advantages of a systematic approach are demonstrated. The multi-purpose numerical procedures using the guidelines allow an adjustment of the shape to thermally and mechanically induced loads and offer new possibilities to meet the specific demands of ceramic materials.

New semi three-dimensional approach for simulation of Lamb wave clamp-on ultrasonic gas flowmeter

Sensor Review ◽  
2020 ◽  
Vol 40 (4) ◽  
pp. 465-476
Author(s):  
Seyed Foad Mousavi ◽  
Seyed Hassan Hashemabadi ◽  
Jalil Jamali
Keyword(s):  
Lamb Wave ◽  
Gas Flow ◽  
Computing Time ◽  
Three Dimensional ◽  
Dimensional Approach ◽  
Three Dimensional Model ◽  
Contact Mode ◽  
New Approach ◽  
Content Type ◽  
2D Simulation

Purpose The purpose of this study is to numerically simulate the Lamb wave propagation through a clamp-on ultrasonic gas flowmeter (UGF) in contact mode, using a new semi three-dimensional approach. Moreover, experimental and analytical modeling results for transit time difference method have been used to confirm the simulation results at different gas flow velocities from 0.3 to 2.4 m/s. Design/methodology/approach The new semi three-dimensional approach involves the simulation of the flow field of the gas in a three-dimensional model and subsequently the simulation of wave generation, propagation and reception in a two-dimensional (2D) model. Moreover, the analytical model assumes that the wave transitions occur in a 2D mode. Findings The new approach is a semi three-dimensional approach used in this work, has better accuracy than a complete 2D simulation while maintaining the computing time and costs approximately constant. It is faster and less expensive than a complete 3D simulation and more accurate than a complete 2D simulation. It was concluded that the new approach could be extended to simulate all types of ultrasonic gas and non-gas flowmeters, even under harsh conditions. Originality/value In this work, a new approach for the numerical simulation of all types of ultrasonic flowmeters is introduced. It was used for simulation of a Lamb wave ultrasonic flow meter in contact mode.

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