scholarly journals STUDY OF PROCESSES OF PRESSURE AND IMPULSE FREQUENCY INFLUENCE ON PENETRATION OF LIQUIDS IN THE SAND SAMPLES

2016 ◽  
pp. 120-125
Author(s):  
M. Ya. Habibullin ◽  
R. R. Shangareyev
Keyword(s):  
Experimental Data ◽  
Oil Recovery ◽  
Pressure Fluctuations ◽  
Experimental Studies ◽  
Regression Equations ◽  
Linear Variation ◽  
Frequency Range ◽  
Impulse Frequency ◽  
Overburden Pressure

The article deals with the issues related to the hydrocarbon reservoirs oil recovery enhancement. It describes the bench laboratory experimental studies. The results obtained during determination of fluid leakage through the rock samples and the amount of absorption of pressure fluctuations at various regime parameters are presented. Using the experimental data the regression analysis was performed on the basis of which the qualitative correlations between factorial and resultant features were identified. Using the regression equations the graphic relations were constructed. It was found that with increasing the oscillation frequency of the fluid the amount of fluid passing through the sample of porous medium increased, with the highest value of q reached at the frequency range of 600 ... 1000 Hz. With increase in the oscillations penetration depth the absorption of the amplitude of the pressure fluctuations corresponds to the linear decrease, and with the overburden pressure increase the linear variation of absorption is distorted.

VIBRATION-ISOLATING BALL-TYPE CLUTCH AS A SOURCE OF INCREASED VIBRATION ACTIVITY IN THE SYSTEM: AMORTIZED MECHANISM – SHAFT LINE

Akustika ◽  
2021 ◽  
pp. 177
Author(s):  
Irina Kudryavtseva ◽  
Sergey A. Rykov ◽  
Sergey V. Rykov
Keyword(s):  
Experimental Data ◽  
Experimental Studies ◽  
Wide Frequency Range ◽  
Test Stand ◽  
Frequency Range ◽  
Diagnostic Features ◽  
Shaft Line

The results of experimental studies of vibration activity of a vibration-insulating ball-type clutch installed on a shaft line are presented. These studies were made on the test stand. It is shown that, depending on the value of the shaft line fracture, the vibration activity of the ball-type clutch can increase in a wide frequency range up to 30 dB. The diagnostic features of the ball-type clutch which allow estimating its vibration activity have been identified on the basis of the analysis of experimental data.

Investigation of the parameters of the cooling strength of compression foam when feeding through pumping and hose systems at low temperatures

2021 ◽  
Vol 92 ◽  
pp. 8-19
Author(s):  
M. V. Aleshkov ◽  
◽  
T. G. Merkushkina ◽  
V. D. Fedyaev ◽  
A. S. Gumirov ◽  
...  
Keyword(s):  
Experimental Data ◽  
Mass Flow ◽  
Low Temperatures ◽  
Statistical Data ◽  
Experimental Studies ◽  
Ambient Temperatures ◽  
Measuring Complex ◽  
Negative Temperatures ◽  
Goals And Objectives

Introduction. The article describes a methodology and a program of experimental studies to determine the parameters of the cooling strength of compression foam when feeding through pumping and hose systems at low temperatures. The numerical values of the parameters of the cooling strength of the compression foam when feeding through the fire hose 20 m long are determined. The experimental dependences of the parameters of the cooling strength of the compression foam on the multiplicity and mass flow are obtained. Goals and objectives. A program and methodology for experimental studies to determine the parameters of the intensity of cooling of compression foam when feeding through pumping and hose systems has been developed. To carry out experimental studies, the following tasks were set: - development of a measuring complex for determining the parameters of the cooling strength of compression foam when feeding through pumping and hose systems at negative temperatures; - determination of the physical model of the movement of the compression foam when feeding through the fire hoses; - development of a program and methodology for experimental research to determine the mass flow rate of compression foam. Methods. Methods of mathematical analysis of statistical data obtained during experimental data were used to determine the parameters of the cooling strength of compression foam when feeding through the pumping and hose systems. Results and its discussion. The numerical value of the cooling of the compression foam when feeding through the pumping-hose systems at low temperatures was obtained experimentally, depending on the multiplicity along the length of the hose line. Conclusions. 1. A program and methodology for conducting experimental studies to determine the parameters of the cooling strength of compression foam when feeding through pumping and hose systems at low temperatures has been developed. 2. As a result of the experimental studies, data were obtained on the rates and parameters of the cooling strength of the compression foam when feeding through fire hoses in winter at various negative temperatures. To measure the parameters of the cooling strength of compression foam when feeding through fire hoses at negative ambient temperatures, a measuring complex was developed and assembled. 3. The data obtained will make it possible to evaluate the parameters of the compression strength of foam cooling when feeding through the pumping and hose systems at low temperatures. Keywords: intensity of cooling, compression foam, foam-air mixture, pumping-hose system, foam generating unit, a unit for generating and supplying compression foam, low temperatures

scholarly journals Determination of dry residue of drinking water by quartz crystal microbalance method

2020 ◽  
pp. 99-102
Author(s):  
A. G. Zavodovsky ◽  
Keyword(s):  
Experimental Data ◽  
Drinking Water ◽  
Tap Water ◽  
Experimental Studies ◽  
Gravimetric Method ◽  
Drinking Water Treatment ◽  
Large Mass ◽  
Experimental Conditions ◽  
Important Indicator

The dry residue of water characterizes its quality with great completeness, since it contains all impurities, including nonvolatile organic substances. Therefore, the mass of dry residue can characterize the depth of drinking water treatment and is an important indicator of its quality. Currently, this parameter is determined by the gravimetric method. The determination of the dry residue mass by this method requires considerable time for the analysis and the use of a large mass of the substance. Quartz microweights, the sensitive element of which is a quartz piezoresonator, do not have these disadvantages. The purpose of this work is to evaluate the possibility of using the piezoquartz microweighing method for rapid analysis of drinking water quality. The use of this highly mass-sensitive method (10–8–10–9 g) can significantly reduce the mass of water used for the experiment, and, accordingly, the analysis time, which is determined by the evaporation time of the substance. An experimental module based on a quartz piezoresonator is created to perform experimental studies. The mass-sensitive coefficient of microweights is determined using calibration measurements. For the given experimental conditions (temperature 20 ° C, pressure 105 Pa), it is equal to Сf = (9,50,5) 10–9 g/Hz. To assess the possibility of practical use of the piezoquartz microweighing method, various samples of drinking water are studied and the results analyzed. Based on the experimental data, the parameter X is calculated, which characterizes the mass of dry residue in a liter of water. In the course of experimental studies, it is found that the tap water used in the experiment is optimally mineralized by the value of the parameter X, and its purification using a household filter slightly reduces the amount of dry residue. When boiling water, some of the substances dissolved in it precipitates, but its mineralization remains satisfactory. During the distillation process, the amount of dry residue is significantly reduced, and the water becomes slightly mineralized. The results obtained in this work are consistent with the known experimental data. Thus, the piezoquartz microweighing method can be used to determine the dry residue of drinking water when evaluating its quality in various technological processes

Thermodiffusion motion of electrically charged nanoparticles

Open Physics ◽  
2012 ◽  
Vol 10 (4) ◽  
Author(s):  
Ansis Mezulis ◽  
Mikhail Maiorov ◽  
Oksana Petricenko
Keyword(s):  
Experimental Data ◽  
Theoretical Model ◽  
Electric Potential ◽  
Surface Charge Density ◽  
Potential Distribution ◽  
Colloidal Particles ◽  
Experimental Studies ◽  
Charged Nanoparticles ◽  
Electrically Charged

AbstractThe present work deals with experimental studies to examine the theoretical model of thermodiffusion of electrically charged nanoparticles. Three different ionic magnetic colloid samples have been synthesized and profoundly analyzed. The theoretical model is a classical one, based on the calculation of the temperature and the electric potential distribution around nanoparticles. The discrepancy between experimental data and theory turns out not to exceed 20%. We focus on applying different approximations between calculated electrical double layer in the theoretical model and experimental determination of the surface charge density of colloidal particles. We assume this is the main reason for obtained discrepancy.

scholarly journals Strength Parameters Of Masonry Walls In Modelling Historic Constructions

2015 ◽  
Vol 18 (3) ◽  
pp. 55-64 ◽  
Author(s):  
Michał Gołębiewski ◽  
Izabela Lubowiecka ◽  
Marcin Kujawa
Keyword(s):  
Experimental Data ◽  
Mechanical Properties ◽  
Material Properties ◽  
Experimental Studies ◽  
Basic Material ◽  
Masonry Walls ◽  
The Finite Element Method ◽  
Strength Parameters ◽  
Element Size

Abstract The paper presents the determination of the basic material properties of a historic brickwork. Experimental studies were used to identify the basic material properties of bricks. The mechanical properties of the masonry, as an orthotropic homogenized material, were calculated. Then, numerical simulations using the Finite Element Method (FEM) were performed to verify the experimental outcomes. Macromodels with element sizes of 40, 20, 10 and 5 mm, and a micromodel with an element size of 5 mm were applied. The results were compared with experimental data and results available in literature.

Determination of Adsorption-Retention Constants and Inaccessible Pore Volume for High-Molecular Polymers

2021 ◽  
Author(s):  
Konstantin Mikhailovich Fedorov ◽  
Tatyana Anatolyevna Pospelova ◽  
Aleksandr Vyacheslavovich Kobyashev ◽  
Aleksandr Yanovich Gilmanov ◽  
Tatyana Nikolaevna Kovalchuk ◽  
...  
Keyword(s):  
Inverse Problem ◽  
Oil Recovery ◽  
Pore Volume ◽  
Polymer Concentration ◽  
Experimental Studies ◽  
Front Propagation ◽  
Polymer Transport ◽  
Non Destructive ◽  
Inaccessible Pore Volume

Abstract The application of chemical enhanced oil recovery methods is based mainly on data from experiments. Determining the adsorption constants without destroying the sample remains a relevant problem. It is necessary for accurate data. The determination of filtration parameters of high-molecular polymers in a porous medium using special model is considered in this paper. The aim of the investigation is the solution of inverse problem of polymer transport with adsorption. The key data for this are the characteristic times of the polymer front propagation, water and rock densities, porosity, and initial polymer concentration. The solutions of the direct problem and the inverse problem from the characteristic form of equations are obtained. The algorithm of interpretation of adsorption-retention parameters and inaccessible pore volume form non-destructive experimental studies is developed. Comparison of the calculated values of the inaccessible pore volume with the results of laboratory studies leads to an error within 10%. The practical application of the algorithm was carried out using the data obtained in previously conducted experiments.

scholarly journals THE USE OF LIGHTING TECHNIQUES FOR RAPID REMOTE DETERMINATION OF MOISTURE CONTENT OF SUNFLOWER SEEDS GROWING IN THE FIELDS

2020 ◽  
Author(s):  
V.L. Litvishchenko ◽  
◽  
V.P Dimitrov ◽  
O.A Leshcheva ◽  
A.A. Karnaukh
Keyword(s):  
Electromagnetic Waves ◽  
Sunflower Seed ◽  
Experimental Studies ◽  
Sunflower Seeds ◽  
Frequency Range ◽  
Seed Moisture ◽  
Remote Determination ◽  
Reflected Signal ◽  
The Difference

The method is proposed and the possibility of instantaneous remote determination of sunflower seed moisture using millimeter – range microwave radiation is experimentally investigated. A laboratory experimental setup was created to measure the reflection coefficient of electromagnetic waves from sunflower inflorescences in the frequency range of 25.86-37.5 GHz. In order to create a mathematical model that takes into account the difference between the reflected signal from the side of the inflorescence with sunflower seeds and the reverse side, experimental studies were conducted on the value of the reflected signal from the sunflower inflorescences on both sides of the plant. Experiments were conducted for inflorescences of different degrees of maturity.

Improvement Of Curvilinear Diagrams Of Concrete Deformation

2019 ◽  
pp. 99-104
Keyword(s):  
Reinforced Concrete ◽  
Peak Load ◽  
Experimental Studies ◽  
Concrete Structures ◽  
Deformation Model ◽  
Reinforced Concrete Structures ◽  
Significant Difference ◽  
Deformation Diagrams

Problems when calculating reinforced concrete structures based on the concrete deformation under compression diagram, which is presented both in Russian and foreign regulatory documents on the design of concrete and reinforced concrete structures are considered. The correctness of their compliance for all classes of concrete remains very approximate, especially a significant difference occurs when using Euronorm due to the different shape and sizes of the samples. At present, there are no methodical recommendations for determining the ultimate relative deformations of concrete under axial compression and the construction of curvilinear deformation diagrams, which leads to limited experimental data and, as a result, does not make it possible to enter more detailed ultimate strain values into domestic standards. The results of experimental studies to determine the ultimate relative deformations of concrete under compression for different classes of concrete, which allowed to make analytical dependences for the evaluation of the ultimate relative deformations and description of curvilinear deformation diagrams, are presented. The article discusses various options for using the deformation model to assess the stress-strain state of the structure, it is concluded that it is necessary to use not only the finite values of the ultimate deformations, but also their intermediate values. This requires reliable diagrams "s–e” for all classes of concrete. The difficulties of measuring deformations in concrete subjected to peak load, corresponding to the prismatic strength, as well as main cracks that appeared under conditions of long-term step loading are highlighted. Variants of more accurate measurements are proposed. Development and implementation of the new standard GOST "Concretes. Methods for determination of complete diagrams" on the basis of the developed method for obtaining complete diagrams of concrete deformation under compression for the evaluation of ultimate deformability of concrete under compression are necessary.

Energetic properties of peat saturated with petroleum products

2020 ◽  
Vol 13 (2) ◽  
pp. 105-109
Author(s):  
E. S. Dremicheva
Keyword(s):  
Crude Oil ◽  
Diesel Fuel ◽  
Energy Use ◽  
Experimental Studies ◽  
Calorific Value ◽  
Petroleum Products ◽  
Ash Content ◽  
Motor Oil ◽  
Initial Sample

This paper presents a method of sorption using peat for elimination of emergency spills of crude oil and petroleum products and the possibility of energy use of oil-saturated peat. The results of assessment of the sorbent capacity of peat are presented, with waste motor oil and diesel fuel chosen as petroleum products. Natural peat has been found to possess sorption properties in relation to petroleum products. The sorbent capacity of peat can be observed from the first minutes of contact with motor oil and diesel fuel, and significantly depends on their viscosity. For the evaluation of thermal properties of peat saturated with petroleum products, experimental studies have been conducted on determination of moisture and ash content of as-fired fuel. It is shown that adsorbed oil increases the moisture and ash content of peat in comparison with the initial sample. Therefore, when intended for energy use, peat saturated with petroleum products is to be subjected to additional drying. Simulation of net calorific value has been performed based on the calorific values of peat and petroleum products with different ratios of petroleum product content in peat and for a saturated peat sample. The obtained results are compared with those of experiments conducted in a calorimetric bomb and recalculated for net calorific value. A satisfactory discrepancy is obtained, which amounts to about 12%. Options have been considered providing for combustion of saturated peat as fuel (burnt per se and combined with a solid fuel) and processing it to produce liquid, gaseous and solid fuels. Peat can be used to solve environmental problems of elimination of emergency spills of crude oil and petroleum products and as an additional resource in solving the problem of finding affordable energy.

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