scholarly journals Tracer Transport in a Homogeneous Porous Medium: Experimental Study and Acquisition Data with LabVIEW

2021 ◽  
Author(s):  
Sana Dardouri ◽  
Jalila Sghaier
Keyword(s):  
Electrical Conductivity ◽  
Experimental Study ◽  
Porous Medium ◽  
Real Time ◽  
Soil Column ◽  
The State ◽  
Tracer Transport ◽  
Solute Transfer ◽  
Homogeneous Porous Medium ◽  
Series Of Experiments

This work represent the incorporation of information procurement (DAQ) equipment and programming to acquire information (LabVIEW) as well as real-time transport to show parameter appraises with regard to subsurface stream and transport issues. The main objective is to understand the mechanism of water and solute transfer in a sandy medium and to study the effect of some parameters on the transport of an inert tracer. In order to achieve this objective, a series of experiments were carried out on a soil column equipped with a tensiometer to monitor the state of saturation of the medium and by two four-electrode probes for measuring the electrical conductivity in the porous medium.

A Study of Plane, Radial Miscible Displacement in a Consolidated Porous Medium

1965 ◽  
Vol 5 (01) ◽  
pp. 1-5 ◽  
Author(s):  
R.G. Bentsen ◽  
R.F. Nielsen
Keyword(s):  
Experimental Study ◽  
Porous Medium ◽  
Transition Zone ◽  
Fluid Distribution ◽  
Berea Sandstone ◽  
Circular Sector ◽  
Directional Flow ◽  
Viscous Fingers ◽  
Homogeneous Porous Medium ◽  
Liquid Displacement

Abstract This paper reports an experimental study of the transition zone in plane, radial, miscible, liquid displacement in a homogeneous porous medium. The viscosity of the displacing liquid is greater than that of the displaced liquid in most of the runs, to avoid viscous fingers. A consolidated natural medium was chosen so dispersion would be high enough for measurement. Porosity was 19.5 per cent and permeability was 310 md. The material was Berea sandstone in a circular sector 1.9 cm thick and 91.4 cm in radius. Compositions of produced fluids were determined with a chemical oscillometer in a manner similar to that described by Peffer. Fluid distribution in the plane, radial miscible displacements agreed with the mathematical theory of Raimondi, et al for favorable mobility ratios. Introduction Numerous papers have been published on theory and experiments relating to miscible fluid displacement in porous media. Some excellent reviews have appeared in the petroleum production literature, and it is not necessary to repeat the references listed in these reviews. Most previous experimental work has involved unidirectional flow, although the theory has been extended to radial and multi-directional flow. The experimental work involving multi-directional flow generally has been related to problems other than the extent of the transition zone and the fluid distribution therein, except for some cases where viscous fingering or heterogeneity of the porous media were predominant factors. This paper reports an experimental study of the transition zone in plane, radial, miscible, liquid displacement in a homogeneous porous medium. The viscosity of the displacing liquid is greater than that of the displaced liquid in most of the runs, to avoid viscous fingers. A consolidated natural medium was chosen so that the dispersion would be high enough for measurement. THEORY A solution of the plane, radial dispersion equation for the injection of a finite slug of a second fluid is (1) If injection of the second fluid is continued indefinitely (infinite slug) the second error function becomes unity, and the equation can be written (2) In the experiments to be described, the molecular diffusion constant D can be neglected in the theory. Then differentiation of Eq. 2 gives, for C= 0.5, (3) If it is assumed that, in a finite slug, the maximum concentration of slug material occurs at a time half way between the times at which the head and tail pass a given point, then Eq. l gives (4) where R is the radius of the undiluted slug just after injection. EXPERIMENTAL All runs were carried out on a slab of Berea sandstone in the shape of a circular sector, 1.9 cm thick and 91.4 cm in radius. SPEJ P. 1ˆ

Modelling Of Transport And Capture Of Particles In A Porous Medium

2019 ◽  
pp. 56-60
Keyword(s):  
Porous Medium ◽  
Asymptotic Solution ◽  
Retention Mechanism ◽  
Inverse Filtering ◽  
Underground Structures ◽  
Loose Soil ◽  
Monodisperse Suspension ◽  
Homogeneous Porous Medium ◽  
Model Equations ◽  
Pass Through

The study of the transport and capture of particles moving in a fluid flow in a porous medium is an important problem of underground hydromechanics, which occurs when strengthening loose soil and creating watertight partitions for building tunnels and underground structures. A one-dimensional mathematical model of long-term deep filtration of a monodisperse suspension in a homogeneous porous medium with a dimensional particle retention mechanism is considered. It is assumed that the particles freely pass through large pores and get stuck at the inlet of small pores whose diameter is smaller than the particle size. The model takes into account the change in the permeability of the porous medium and the permissible flow through the pores with increasing concentration of retained particles. A new spatial variable obtained by a special coordinate transformation in model equations is small at any time at each point of the porous medium. A global asymptotic solution of the model equations is constructed by the method of series expansion in a small parameter. The asymptotics found is everywhere close to a numerical solution. Global asymptotic solution can be used to solve the inverse filtering problem and when planning laboratory experiments.

AN EXPERIMENTAL STUDY OF INTERACTION BETWEEN NANOPARTICLES' DEPOSITION ON A SINTERED POROUS MEDIUM AND MIGRATORY FINES

2013 ◽  
Vol 16 (5) ◽  
pp. 459-467 ◽  
Author(s):  
Milad Ahmadi ◽  
Ali Habibi ◽  
Peyman Pourafshary ◽  
Shahab Ayatollahi
Keyword(s):  
Experimental Study ◽  
Porous Medium

EXPERIMENTAL STUDY OF REACTION OF ETHANOL WITH OXYGEN BEHIND SHOCK WAVES USING ATOMIC RESONANCE ABSORPTION SPECTROSCOPY METHOD

2020 ◽  
Author(s):  
N. S. Bystrov ◽  
◽  
A. V. Emelianov ◽  
A. V. Eremin ◽  
P. I. Yatsenko ◽  
...  
Keyword(s):  
Experimental Study ◽  
Shock Waves ◽  
Absorption Spectroscopy ◽  
Vacuum Ultraviolet ◽  
Resonance Absorption ◽  
Atomic Resonance ◽  
Quantitative Measurements ◽  
Series Of Experiments ◽  
Kinetics Of Reaction ◽  
Oxygen Atoms

The kinetics of reaction of C2H5OH with N2O behind shock waves is studied. The quantitative measurements of the time profiles of concentration of O atoms were carried out by the method of atomic resonance absorption spectroscopy (ARAS) using resonance vacuum-ultraviolet line of O-atom at 130.5 nm. For the calibration of absorption intensity of oxygen atoms depending on its concentration, the special series of experiments in the mixture containing different amounts of N2O in Ar was carried out at T = 2100 ± 50 K when molecule of N2O is completely dissociated. An experimental study of the appearance and consumption of oxygen atoms during the reaction of ethanol with oxygen in mixture 10 ppm N2O + (10 ... 0.1) ppm C2H5OH + Ar at temperatures of 16002300 K and pressures of 200-300 kPa have been carried out. A kinetic analysis of obtained data was performed using the Chemkin package.

scholarly journals Circulant Singular Spectrum Analysis to Monitor the State of the Economy in Real Time

Mathematics ◽  
2021 ◽  
Vol 9 (11) ◽  
pp. 1169
Author(s):  
Juan Bógalo ◽  
Pilar Poncela ◽  
Eva Senra
Keyword(s):  
Business Cycles ◽  
Real Time ◽  
Parametric Method ◽  
Singular Spectrum Analysis ◽  
The State ◽  
Signal Extraction ◽  
Alternative Procedure ◽  
State Of The Economy ◽  
Regular Patterns ◽  
Non Parametric

Real-time monitoring of the economy is based on activity indicators that show regular patterns such as trends, seasonality and business cycles. However, parametric and non-parametric methods for signal extraction produce revisions at the end of the sample, and the arrival of new data makes it difficult to assess the state of the economy. In this paper, we compare two signal extraction procedures: Circulant Singular Spectral Analysis, CiSSA, a non-parametric technique in which we can extract components associated with desired frequencies, and a parametric method based on ARIMA modelling. Through a set of simulations, we show that the magnitude of the revisions produced by CiSSA converges to zero quicker, and it is smaller than that of the alternative procedure.

scholarly journals Single-Satellite Integrated Navigation Algorithm Based on Broadband LEO Constellation Communication Links

2021 ◽  
Vol 13 (4) ◽  
pp. 703
Author(s):  
Lvyang Ye ◽  
Yikang Yang ◽  
Xiaolun Jing ◽  
Jiangang Ma ◽  
Lingyu Deng ◽  
...  
Keyword(s):  
Real Time ◽  
Satellite Communication ◽  
The State ◽  
Earth Orbit ◽  
Integrated Navigation ◽  
Location Services ◽  
The Real ◽  
Navigation Algorithm ◽  
Communication Links ◽  
Leo Satellite

With the rapid development of satellite technology and the need to satisfy the increasing demand for location-based services, in challenging environments such as indoors, forests, and canyons, there is an urgent need to improve the position accuracy in these environments. However, traditional algorithms obtain the position solution through time redundancy in exchange for spatial redundancy, and they require continuous observations that cannot satisfy the real-time location services. In addition, they must also consider the clock bias between the satellite and receiver. Therefore, in this paper, we provide a single-satellite integrated navigation algorithm based on the elimination of clock bias for broadband low earth orbit (LEO) satellite communication links. First, we derive the principle of LEO satellite communication link clock bias elimination; then, we give the principle and process of the algorithm. Next, we model and analyze the error of the system. Subsequently, based on the unscented Kalman filter (UKF), we model the state vector and observation vector of our algorithm and give the state and observation equations. Finally, for different scenarios, we conduct qualitative and quantitative analysis through simulations, and the results show that, whether in an altimeter scenario or non-altimeter scenario, the performance indicators of our algorithm are significantly better than the inertial navigation system (INS), which can effectively overcome the divergence problem of INS; compared with the medium earth orbit (MEO) constellation, the navigation trajectory under the LEO constellation is closer to the real trajectory of the aircraft; and compared with the traditional algorithm, the accuracy of each item is improved by more than 95%. These results show that our algorithm not only significantly improves the position error, but also effectively suppresses the divergence of INS. The algorithm is more robust and can satisfy the requirements of cm-level real-time location services in challenging environments.

Experimental Study on the Optimal Thickness of Infiltration Media of the CRI System

2011 ◽  
Vol 415-417 ◽  
pp. 1703-1707
Author(s):  
Jun Min Chen ◽  
Xiao Lin Yao
Keyword(s):  
Experimental Study ◽  
Removal Efficiency ◽  
Significant Influence ◽  
Soil Column ◽  
Experimental Results ◽  
Artificial Soil ◽  
Optimal Thickness ◽  
Effluent Quality ◽  
Anaerobic Zone

Abstract. In order to investigate the optimal thickness of infiltration media in the Constructed Rapid Infiltration System, the artificial soil column is used to simulate the Constructed Rapid Infiltration System, and the CODCr, NH3-N and TN concentrations of the effluent from all the sampling sites are monitored. The experimental results and analysis show that the thickness of infiltration media exerts a significant influence on the CODCr, NH3-N and TN concentration and removal efficiency of the effluent; the CODCr, NH3-N and TN are mainly removed in the 0-1800mm zone of the artificial soil column; the total CODCr removal efficiency increases, as the thickness of infiltration media increases, but the CODCr removal efficiency in the 1800-2200mm zone is very low; the NH3-N and TN removal efficiency reaches the maximum where the thickness of infiltration media is 1800mm; the NH3-N and TN concentration of the effluent from 1800-2200mm zone dose not decrease, but increase 5-8%, due to the assimilation denitrification and amemoniation reaction on the end of the anaerobic zone; in consideration of the effluent quality, efficient biodegradation zone, construction investment, etc. the optimal thickness of infiltration media in CRI system should be 1800mm.

scholarly journals Experimental Study of a Real-Time and Highly Sensitive Fiber-Optic Porous Silicon Temperature Sensing Probe

2018 ◽  
Vol 18 (13) ◽  
pp. 5361-5367
Author(s):  
Raffaele Caroselli ◽  
David Martin Sanchez ◽  
Salvador Ponce-Alcantara ◽  
Francisco Prats Quilez ◽  
Luis Torrijos Moran ◽  
...  
Keyword(s):  
Experimental Study ◽  
Porous Silicon ◽  
Real Time ◽  
Fiber Optic ◽  
Temperature Sensing ◽  
Highly Sensitive

The growth and collapse of cavitation bubbles near composite surfaces

1989 ◽  
Vol 203 ◽  
pp. 199-214 ◽  
Author(s):  
A. Shima ◽  
Y. Tomita ◽  
D. C. Gibson ◽  
J. R. Blake
Keyword(s):  
Experimental Study ◽  
Bubble Size ◽  
The State ◽  
Bubble Collapse ◽  
Viscoelastic Materials ◽  
Effective Parameters ◽  
Composite Surface ◽  
Surface Stiffness ◽  
Cavitation Bubbles

An experimental study has been made of the growth and collapse of a bubble near a composite surface consisting of two viscoelastic materials. The migratory characteristics of the bubble are examined by means of streak photography. The bubble migration depends not only on the properties of the composite surface but also on bubble size and distance from the surface. Both the surface stiffness and surface inertia are considered to be effective parameters contributing to the bubble migration: the former seeming to be a particularly important factor. The state of neutral bubble collapse, with no migration towards or away from a surface, can be made to occur with an appropriate combination of the surface stiffness and inertia.

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