scholarly journals Experimental Study on the Influence of Moisture Content during Gas Depressurization Extraction

2019 ◽  
Vol 2019 ◽  
pp. 1-9 ◽  
Author(s):  
Yuexia Chen ◽  
Xuexi Chen ◽  
Jiang Xu ◽  
Tingxiang Chu
Keyword(s):  
Moisture Content ◽  
Flow Rate ◽  
Gas Flow ◽  
Effective Permeability ◽  
System Analysis ◽  
Volumetric Strain ◽  
Gas Pressure ◽  
Gas Flow Rate ◽  
Coal Deformation ◽  
The Relationship

Although there are many reports about the influence of moisture in the process of gas extraction, studies about the influence of moisture on gas flow, permeability, and coal deformation by experimental system analysis are lacking. Physical simulations of gas depressurization extraction using triaxial servo-controlled seepage equipment for hot-fluid-solid coupling were conducted. The gas flow rate, permeability, and strain were analysed during gas depressurization extraction. The relationship between gas flow rate and gas pressure was a quadratic polynomial. Permeability and strain changed continuously with the decrease of gas pressure and interacted with each other during gas depressurization extraction. In the initial stage, the effective permeability decreased. With the continuous decrease of gas pressure, the permeability gradually recovered. When the gas pressure dropped to about 0.6 MPa, the permeability increased rapidly and the corresponding volumetric strain increased gradually. With the increase of moisture content, the relationship between gas flow rate and gas pressure became less significant. The experiments showed that the higher the moisture content, the lower the effective permeability and the larger the volumetric strain.

Numerical Simulation of Thermal Cycle of In-Service Welding on X70 Steel Gas Pipeline

2009 ◽  
Vol 79-82 ◽  
pp. 1169-1172 ◽  
Author(s):  
Yu Hua Chen ◽  
Yong Wang ◽  
Zheng Fang Wang
Keyword(s):  
Flow Rate ◽  
Thermal Cycle ◽  
Gas Flow ◽  
Gas Pressure ◽  
Gas Pipeline ◽  
Peak Temperature ◽  
Coarse Grain ◽  
Air Cooling ◽  
Gas Flow Rate ◽  
Oil Gas

In-service welding is a kind of important method to ensure the integrality of oil gas pipeline and the thermal cycle of which is significant for repairing. Used SYSWELD to establish model and simulate thermal cycle of in-service welding on X70 steel gas pipeline, compared thermal cycles of in-service welding and air-cooling welding, studied the influence of gas pressure and flow rate on thermal cycle. The result shows that peak temperature of the coarse grain in heat affected zone (CGHAZ) of in-service welding is similar to air cooling welding, but the cooling time of t8/5, t8/3 and t8/1 decreases at certain degree. Peak temperature of CGHAZ of in-service welding doesn’t vary match with gas pressure and flow rate either. t8/5, t8/3 and t8/1 decrease when gas pressure increases. t8/5 varies with the gas pressure linearly. When the pressure is less than 4MPa, t8/3 and t8/1 decrease rapidly while gas pressure increases. When the pressure is more than 4MPa, t8/3 and t8/1 decrease slowly while gas pressure increases. t8/5, t8/3 and t8/1 decrease when the flow rate increases. When gas flow rate is less than 10m/s, t8/5, t8/3 and t8/1 decrease rapidly while flow rate increases. When gas flow rate is more than 10m/s, t8/5, t8/3 and t8/1 decrease slowly while flow rate increases.

Wpływ warunków środowiskowych i instalacyjnych na proces wymiany ciepła w wybranych przemysłowych gazomierzach miechowych

Nafta-Gaz ◽  
2020 ◽  
Vol 76 (11) ◽  
pp. 828-836
Author(s):  
Adrian Dudek ◽  
Keyword(s):  
Heat Exchange ◽  
Ambient Temperature ◽  
Flow Rate ◽  
Gas Flow ◽  
Exchange Process ◽  
Test Results ◽  
Gas Temperature ◽  
Gas Flow Rate ◽  
Heat Exchange Process ◽  
The Relationship

Since 2016, Oil and Gas Institute – National Research Institute (INiG – PIB) has been conducting new research to determine the relationship between ambient temperature and gas temperature in industrial diaphragm gas meters during the measurement, and to develop new recommendations for billing systems using industrial diaphragm gas meters with a throughput of until 25 m3/h. In the first stage, work was carried out, in which the obtained test results confirmed that the heat exchange process in an industrial diaphragm gas meter depends on the ambient temperature, the gas temperature at the inlet to the gas meter, the flow rate of the gas flowing, as well as the casing surface and the gas volume of the gas meter. In the next stage, work was carried out to determine the relationship between ambient temperature and gas temperature at the industrial diaphragm gas meter connection during the measurement. The obtained results undermined the thesis, which indicated that the gas inlet temperature is equal to the gas temperature at the depth of the gas network. In the last stage, work was carried out to determine the course of changes in gas temperature in industrial diaphragm gas meters as a function of ambient temperature and cyclical changes of the gas flow rate, which were to reflect the work of gas meters installed at customers’ premises. The analysis of the obtained test results once again showed a strong dependence of the gas temperature inside industrial diaphragm gas meters on the ambient temperature, but also on the flow rate of gas. The obtained results of laboratory tests will be used to carry out a thermodynamic description of the heat exchange process in an industrial diaphragm gas meter, which would allow the determination of the gas billing temperature as a function of the ambient temperature, the temperature of the inflowing gas and the gas flow rate. The calculated gas temperature values could be used to determine the temperature correction factors applicable when settling gas consumers billed on the basis of measurement with the use of industrial diaphragm gas meters.

Experimental Characterization of Aerosol Production, Transport, Vaporization, and Atomization Systems. Part I: Factors Controlling Aspiration Rates

1985 ◽  
Vol 39 (6) ◽  
pp. 916-920 ◽  
Author(s):  
R. K. Skogerboe ◽  
S. J. Freeland
Keyword(s):  
Pressure Drop ◽  
Flow Rate ◽  
Gas Flow ◽  
Present Knowledge ◽  
Experimental Characterization ◽  
Gas Flow Rate ◽  
Factors Affecting ◽  
Simple Linear Equation ◽  
The Relationship

This paper describes the results of the first stage of an investigation designed to extend present knowledge of the factors affecting aerosol production, transport, vaporization, and atomization in analytical spectroscopy systems. It focuses on factors controlling aspiration of aqueous solutions. The results demonstrate that the effect of gas flow on the pressure drop induced at the tip of the solution draw tube can be described by a simple linear equation; that the relationship between gas flow rate and solution nebulization rate can also be modelled by a simple equation; and that these relationships are not adequately represented by the Hagen-Poiseulle equation, as is often claimed.

Mixing of Fluids in Tanks by Gas Bubble Plumes

1987 ◽  
Vol 109 (2) ◽  
pp. 186-193 ◽  
Author(s):  
A. M. Godon ◽  
J. H. Milgram
Keyword(s):  
Flow Rate ◽  
Gas Flow ◽  
Mixing Time ◽  
Empirical Relationship ◽  
Scale Model ◽  
Gas Bubble ◽  
Gas Flow Rate ◽  
Dimensionless Variable ◽  
Bubble Plumes ◽  
The Relationship

The need to rapidly mix treating agent into the oil of a ruptured ship tank motivated scale model experiments of mixing in square-bottomed tanks by gas bubble plumes, The mixing time is primarily governed by the gas flow rate, the plume length and the tank base dimensions; and is quite insensitive to tank height. An empirical relationship between the degree of mixing and a single dimensionless variable is developed and an explanation of the relationship in terms of the fundamentals of the flow is provided.

Three-dimensional viscoelastic numerical analysis of the effects of gas flow on L-profiled polymers in gas-assisted coextrusion

2018 ◽  
Vol 38 (5) ◽  
pp. 503-512 ◽  
Author(s):  
Xiaozhen Deng ◽  
Hesheng Liu
Keyword(s):  
Layer Thickness ◽  
Flow Rate ◽  
Gas Flow ◽  
Three Dimensional ◽  
Gas Pressure ◽  
Melt Flow ◽  
Flow Zone ◽  
Melt Flow Rate ◽  
Gas Layer ◽  
The Relationship

AbstractIn this study, polymer gas-assisted coextrusion experiments were performed. The influence of a traditional coextrusion flow zone on the gas groove and the relationship between the gas pressure and the melt flow rate were studied. To determine the effects of the gas flow on gas-assisted coextrusion, a three-dimensional simulation was developed in which the gas layer was considered as an independent flow zone. The influence of the gas pressure, gas layer thickness and melt flow rate on the melts’ profile and the deflection deformation degree (DDD) was studied, and the relationship between the gas pressure, gas layer thickness and melt flow rate was obtained. The numerical results indicated that a traditional coextrusion flow zone in front of a gas-assisted coextrusion flow zone could allow products to avoid a gas groove. The quality of the products could be improved by decreasing the gas pressure and gas layer thickness or increasing the melt flow rate. Additionally, the minimum gas pressure decreased as the gas layer thickness increased and increased as the melt flow rate increased. The numerical results were in good agreement with the experimental results, despite a slight quantitative error. Therefore, reasonably controlling the gas flow condition is key in practical applications of gas-assisted coextrusion, and the effects of the gas layer should be considered in gas-assisted coextrusion simulations.

Experimental Study of Nozzle Characteristics by Drainage Method

2014 ◽  
Vol 644-650 ◽  
pp. 1422-1425
Author(s):  
Da Wei Qu ◽  
Zhan Cai Sa ◽  
Lu Yan Fan ◽  
Jun Yan Ma
Keyword(s):  
Experimental Study ◽  
Flow Rate ◽  
Duty Cycle ◽  
Gas Flow ◽  
Gas Pressure ◽  
Gas Flow Rate ◽  
Injection Frequency ◽  
Pressure Transmitter ◽  
Nozzle Opening

The characteristic of nozzle jeting is affected by injection frequency, gas pressure in the piping and duty cycle of the control signal.The experimental study is in order to determine nozzle’s opening frequency, duty cycle and pipe pressure affect to the gas flow rate using a drainage method, nozzle opening frequency and duty cycle are controled by mototron platform and ATI Vision calibration software,while using pressure transmitter to measure the change of pipe pressure relationship with duty cycle and frequency.

Influences of sputtering gas pressure and gas flow rate on microwave characteristics of FeCoAlO thin films

2011 ◽  
Vol 519 (23) ◽  
pp. 8292-8295 ◽  
Author(s):  
Feng Xu ◽  
Qiyun Xie ◽  
Nyugen Nyugen Phuoc ◽  
Shandong Li ◽  
Chong Kim Ong
Keyword(s):  
Thin Films ◽  
Flow Rate ◽  
Gas Flow ◽  
Gas Pressure ◽  
Gas Flow Rate ◽  
Microwave Characteristics

Investigation on the Transport Characteristics of Typical Biological Slender Particles in a Pilot-Scale Rotary Dryer

2011 ◽  
Vol 396-398 ◽  
pp. 315-321
Author(s):  
Wen Kui Zhu ◽  
Bin Li ◽  
Chuan Fang Yu ◽  
Liang Yuan Chen
Keyword(s):  
Moisture Content ◽  
Flow Rate ◽  
Gas Flow ◽  
Pilot Scale ◽  
Average Residence Time ◽  
Gas Flow Rate ◽  
Rotating Speed ◽  
Rotary Dryer ◽  
Transport Velocity ◽  
Cut Tobacco

The transport characteristics of cut tobacco as a typical biological wet slender particle were investigated in a pilot-scale rotary cylinder. Effect of solids and gas flow rate, moisture content of particles and rotating speed of cylinder was analyzed. The adaptability of the classical Friedman model for predicting average residence time of these type particles was also investigated. The result shows that the gas flow rate, moisture content of particles as well as rotating speed of cylinder have a significant influence on the axis transport velocity and forward step per cycle of cut tobacco in rotary cylinder. It’s difficult for Friedman model to accurately describe influence of gas flow rate and moisture content on transport of cut tobacco, which was associated with the particle characterize and influence of moisture content on the fluidity of particles.

Research on the Relationship between the Spray Overlap Width and the Photoresist Film Thickness and Uniformity

2012 ◽  
Vol 535-537 ◽  
pp. 1308-1313
Author(s):  
De Gang Qu ◽  
Dong Xiang ◽  
Peng Mou ◽  
Han Wang ◽  
Ying Li Gong ◽  
...  
Keyword(s):  
Film Thickness ◽  
Droplet Size ◽  
Flow Rate ◽  
Gas Flow ◽  
Gas Flow Rate ◽  
Carrier Gas ◽  
Photoresist Film ◽  
Good Uniformity ◽  
Carrier Gas Flow ◽  
The Relationship

Because of its small average droplet size, low carrier gas flow rate and the droplets not easy to splash etc, the ultrasonic atomizing spray technology is particularly suitable for making photoresist films. In order to get a reasonable spray scan interval, the parabolic deposition model was used to study the relationship between the spray overlap width and the photoresist film thickness and uniformity, and it can be concluded that the thickness of the film increases and the thickness variance of the film decreases oscillatorily along with the increasing of the spray overlap width.To obtain good uniformity of the photoresist film, the dimensionless overlap width should be at least greater than 0.15.

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