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WAVES AT THE INTERFACE WITH COUNTERCURRENT FLOW OF A THIN LIQUID FILM AND TURBULENT GAS IN A NARROW VERTICAL CHANNEL
IF 0.5 4区 工程技术
Journal of Applied Mechanics and Technical Physics Pub Date : 2024-12-09 DOI: 10.1134/S0021894424030039
O. Yu. Tsvelodub
{"title":"WAVES AT THE INTERFACE WITH COUNTERCURRENT FLOW OF A THIN LIQUID FILM AND TURBULENT GAS IN A NARROW VERTICAL CHANNEL","authors":"O. Yu. Tsvelodub","doi":"10.1134/S0021894424030039","DOIUrl":"10.1134/S0021894424030039","url":null,"abstract":"<p>A countercurrent flow of a liquid film and a turbulent gas in a narrow vertical channel is considered. In the case of small Reynolds numbers and under certain conditions of the flow parameters, the problem is reduced to studying one evolutionary integrodifferential equation for the deviation of film thickness from an unperturbed level. Evolution of periodic disturbances is numerically studied. Several solutions to the model equation are presented.</p>","PeriodicalId":608,"journal":{"name":"Journal of Applied Mechanics and Technical Physics","volume":"65 3","pages":"414 - 426"},"PeriodicalIF":0.5,"publicationDate":"2024-12-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142798390","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
EQUILIBRIUM MODEL OF THE MIXING LAYER IN SHEAR FLOW OF A STRATIFIED FLUID
IF 0.5 4区 工程技术
Journal of Applied Mechanics and Technical Physics Pub Date : 2024-12-09 DOI: 10.1134/S0021894424030040
V. Yu. Liapidevskii, A. A. Chesnokov
{"title":"EQUILIBRIUM MODEL OF THE MIXING LAYER IN SHEAR FLOW OF A STRATIFIED FLUID","authors":"V. Yu. Liapidevskii,&nbsp;A. A. Chesnokov","doi":"10.1134/S0021894424030040","DOIUrl":"10.1134/S0021894424030040","url":null,"abstract":"<p>A mathematical model is proposed that describes the formation of internal hydraulic jumps and the mixing of codirectional flows of an ideal stratified fluid in the Boussinesq approximation. The model is based on a three-layer representation of the flow taking into account the entrainment of fluid from the outer layers into the intermediate vortex layer and is represented as a system of inhomogeneous conservation laws. The rate of entrainment is given by the equilibrium condition within the framework of a more general model for the evolution of the mixing layer. The velocity of propagation of disturbances and the concepts of subcritical and supercritical flows are formulated. It is shown that the model is suitable for describing flow mixing and splitting in deep-sea currents. Solutions were constructed that correspond to the flow around an obstacle with the formation of an internal hydraulic jump and a region of intense mixing. The results of numerical simulation were shown to be in good agreement with experimental data.</p>","PeriodicalId":608,"journal":{"name":"Journal of Applied Mechanics and Technical Physics","volume":"65 3","pages":"427 - 438"},"PeriodicalIF":0.5,"publicationDate":"2024-12-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142798246","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
DETERMINATION OF THE EFFECTIVE DYNAMIC YIELD STRENGTH OF HETEROGENEOUS MATERIALS
IF 0.5 4区 工程技术
Journal of Applied Mechanics and Technical Physics Pub Date : 2024-12-09 DOI: 10.1134/S0021894424030131
A. E. Buzyurkin, A. E. Kraus, E. I. Kraus, I. I. Shabalin
{"title":"DETERMINATION OF THE EFFECTIVE DYNAMIC YIELD STRENGTH OF HETEROGENEOUS MATERIALS","authors":"A. E. Buzyurkin,&nbsp;A. E. Kraus,&nbsp;E. I. Kraus,&nbsp;I. I. Shabalin","doi":"10.1134/S0021894424030131","DOIUrl":"10.1134/S0021894424030131","url":null,"abstract":"<p>A method of determining the dynamic yield strength of heterogeneous materials is proposed, based on comparisons of the processes of cavity formation in the reference and examined materials. A series of computations is performed for penetration of an elongated rod into homogeneous and heterogeneous massive targets. A nonmonotonic dependence of the penetration depth on the motion velocity is derived. The yield strength limit of a heterogeneous medium is obtained from the analysis of computation results in the coordinates of the specific kinetic energy of the rod and the work of stresses on plastic strains.</p>","PeriodicalId":608,"journal":{"name":"Journal of Applied Mechanics and Technical Physics","volume":"65 3","pages":"519 - 527"},"PeriodicalIF":0.5,"publicationDate":"2024-12-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142798399","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
VORTEX STRUCTURES IN SUPERSONIC JETS EXHAUSTING INTO A SUBMERGED SPACE
IF 0.5 4区 工程技术
Journal of Applied Mechanics and Technical Physics Pub Date : 2024-12-09 DOI: 10.1134/S0021894424030052
V. N. Zaikovskii, V. P. Kiselev, S. P. Kiselev, O. V. Belai, G. V. Trubacheev
{"title":"VORTEX STRUCTURES IN SUPERSONIC JETS EXHAUSTING INTO A SUBMERGED SPACE","authors":"V. N. Zaikovskii,&nbsp;V. P. Kiselev,&nbsp;S. P. Kiselev,&nbsp;O. V. Belai,&nbsp;G. V. Trubacheev","doi":"10.1134/S0021894424030052","DOIUrl":"10.1134/S0021894424030052","url":null,"abstract":"<p>Results of studying gas flows in a setup used for cold gas-dynamic spraying are reported. The setup consists of a cylindrical input channel with a central rod connected at a right angle with a rectangular slotted channel. Injection of a high-pressure gas through the input channel leads to gas acceleration. It is shown that there are velocity and pressure disturbances in a supersonic overexpanded jet exhausting from the channel, which arise due to the presence of compression and expansion waves, as well as streamwise vortices. The contribution of streamwise vortices to pressure and velocity disturbances is approximately 30%. Streamwise vortices are formed at the entrance of the slotted channel owing to the curvature of streamlines.</p>","PeriodicalId":608,"journal":{"name":"Journal of Applied Mechanics and Technical Physics","volume":"65 3","pages":"439 - 450"},"PeriodicalIF":0.5,"publicationDate":"2024-12-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142798245","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
HEART RATE EFFECT ON BLOOD FLOW HEMODYNAMICS IN A PATIENT WITH A THORACIC AORTIC ANEURYSM: NUMERICAL STUDY
IF 0.5 4区 工程技术
Journal of Applied Mechanics and Technical Physics Pub Date : 2024-12-09 DOI: 10.1134/S0021894424030088
A. Faraji, M. Sahebi, S. S. Dezfouli
{"title":"HEART RATE EFFECT ON BLOOD FLOW HEMODYNAMICS IN A PATIENT WITH A THORACIC AORTIC ANEURYSM: NUMERICAL STUDY","authors":"A. Faraji,&nbsp;M. Sahebi,&nbsp;S. S. Dezfouli","doi":"10.1134/S0021894424030088","DOIUrl":"10.1134/S0021894424030088","url":null,"abstract":"<p>In this study, the effect of patient’s physical activity in terms of the heart rate on the growth of the thoracic aortic aneurysm (TAA) is studied. Using medical images of the patient, a patient-specific geometry model is constructed. Then the hemodynamic parameters of the blood flow are numerically analyzed for different heart rate conditions. The simulation results show that the maximum wall shear stress, the maximum velocity, and the maximum pressure during a cardiac cycle increase by 19.1, 12.7, and 50%, respectively, as the heart rate increases from 60 to 174 beats per minute. Results also indicate that an increase in the heart rate leads to reduction of the time-averaged wall shear stress and simultaneously to an increase in the wall shear stress oscillations. According to the literature, these hemodynamic conditions are undesirable and can increase the likelihood of aneurysm development and aortic rupture.</p>","PeriodicalId":608,"journal":{"name":"Journal of Applied Mechanics and Technical Physics","volume":"65 3","pages":"465 - 475"},"PeriodicalIF":0.5,"publicationDate":"2024-12-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142798397","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
RESIDUAL WATER SATURATION OF AN OIL RESERVOIR REDUCED USING GBA-F MULTIFUNCTIONAL COMPOSITION
IF 0.5 4区 工程技术
Journal of Applied Mechanics and Technical Physics Pub Date : 2024-12-09 DOI: 10.1134/S0021894424030064
V. I. Pen’kovskii, N. K. Korsakova, L. K. Altunina, V. A. Kuvshinov
{"title":"RESIDUAL WATER SATURATION OF AN OIL RESERVOIR REDUCED USING GBA-F MULTIFUNCTIONAL COMPOSITION","authors":"V. I. Pen’kovskii,&nbsp;N. K. Korsakova,&nbsp;L. K. Altunina,&nbsp;V. A. Kuvshinov","doi":"10.1134/S0021894424030064","DOIUrl":"10.1134/S0021894424030064","url":null,"abstract":"<p>This paper describes the study of a method for controlling the physical and chemical properties of an oil reservoir in order to increase its oil recovery by injecting a GBA-F acid composition into the reservoir. An experimental testbed is developed to physically simulate the effect of the acid composition on the oil reservoir. Experiments are carried out using the flat model with a single injection of the reagent into the central wellbore. Experimental results confirm the effectiveness of the acid composition.</p>","PeriodicalId":608,"journal":{"name":"Journal of Applied Mechanics and Technical Physics","volume":"65 3","pages":"451 - 455"},"PeriodicalIF":0.5,"publicationDate":"2024-12-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142798247","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
ALGORITHM FOR 3D QUANTIFICATION OF ABDOMINAL AORTIC SHAGGINESS BASED ON LUMEN MORPHOLOGY ANALYSIS USING CTA IMAGES
IF 0.5 4区 工程技术
Journal of Applied Mechanics and Technical Physics Pub Date : 2024-12-09 DOI: 10.1134/S0021894424030192
Ya. V. Fedotova, E. V. Amelina, R. I. Mullyadzhanov, A. A. Karpenko
{"title":"ALGORITHM FOR 3D QUANTIFICATION OF ABDOMINAL AORTIC SHAGGINESS BASED ON LUMEN MORPHOLOGY ANALYSIS USING CTA IMAGES","authors":"Ya. V. Fedotova,&nbsp;E. V. Amelina,&nbsp;R. I. Mullyadzhanov,&nbsp;A. A. Karpenko","doi":"10.1134/S0021894424030192","DOIUrl":"10.1134/S0021894424030192","url":null,"abstract":"<p>A method is proposed for three-dimensional quantification of the shagginess of a pathologically altered aorta with account for a three-dimensional lumen morphology. An algorithm for assessing local shagginess is developed and implemented, and an integral criterion for shagginess in the anatomical region is proposed. The algorithm is tested on data from two patients with a shaggy and a smooth lumen. The results obtained in this study are in good agreement with visual assessment performed by expert surgeons and are also confirmed by clinical outcomes during surgery.</p>","PeriodicalId":608,"journal":{"name":"Journal of Applied Mechanics and Technical Physics","volume":"65 3","pages":"573 - 581"},"PeriodicalIF":0.5,"publicationDate":"2024-12-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142798404","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
SPECIFIC FEATURES OF FLAME FORMATION IN A COLLISION OF TWO HYDROGEN JETS
IF 0.5 4区 工程技术
Journal of Applied Mechanics and Technical Physics Pub Date : 2024-12-09 DOI: 10.1134/S0021894424030015
A. S. Tambovtsev, V. V. Kozlov, Yu. A. Litvinenko, M. V. Litvinenko, A. G. Shmakov
{"title":"SPECIFIC FEATURES OF FLAME FORMATION IN A COLLISION OF TWO HYDROGEN JETS","authors":"A. S. Tambovtsev,&nbsp;V. V. Kozlov,&nbsp;Yu. A. Litvinenko,&nbsp;M. V. Litvinenko,&nbsp;A. G. Shmakov","doi":"10.1134/S0021894424030015","DOIUrl":"10.1134/S0021894424030015","url":null,"abstract":"<p>Results of studying interaction of two colliding axisymmetric laminar microjets of hydrogen in the course of their diffusion combustion are reported. Gas exhaustion occurs with identical velocities through pairs of micronozzles, which are thin-walled cylindrical tubes with an inner diameter of 200 <span>(mu)</span>m. The transverse positions of the tubes with respect to each other are changed during the experiment. Specific features of flame formation from two interacting microjets are found for different transverse positions of the tubes, and the results are compared with flames of single microjets with the same exhaustion velocity.</p>","PeriodicalId":608,"journal":{"name":"Journal of Applied Mechanics and Technical Physics","volume":"65 3","pages":"393 - 400"},"PeriodicalIF":0.5,"publicationDate":"2024-12-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142798243","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
NUMERICAL INVESTIGATION ON CHARACTERISTICS OF THE SHOCK WAVE GENERATED BY AN ANNULAR NESTED CHARGE
IF 0.5 4区 工程技术
Journal of Applied Mechanics and Technical Physics Pub Date : 2024-12-09 DOI: 10.1134/S0021894424030027
Jun-bao Li, Wei-bing Li, Xiao-ming Wang
{"title":"NUMERICAL INVESTIGATION ON CHARACTERISTICS OF THE SHOCK WAVE GENERATED BY AN ANNULAR NESTED CHARGE","authors":"Jun-bao Li,&nbsp;Wei-bing Li,&nbsp;Xiao-ming Wang","doi":"10.1134/S0021894424030027","DOIUrl":"10.1134/S0021894424030027","url":null,"abstract":"<p>This study is aimed at understanding some characteristics of the shock wave generated by a novel composite charge consisting of an inner high explosive, a medium non-detonating layer, and an outer aluminized explosive. The influence of the shell restraints and initiation modes on the peak overpressure and impulse of the charge is investigated. Numerical models are developed based on the mapping function of AUTODYN for determining the spatial distribution of the shock wave overpressure. By means of validation experiments, the accuracy of the developed model is verified. It is found that the peak overpressure and impulse obtained from experiments and simulations are in good agreement, with a deviation of less than 16.9%. The difference in the overpressures at various azimuths decreases with increasing distance, and the shock wave profile eventually evolves into a spherical shape. The radial overpressure of the shelled composite charge is initially greater than that in the axial direction and decays rapidly with increasing distance. The azimuth corresponding to the maximum peak overpressure is shifted from 75° for the bare charge to 110° for the shelled charge. It is found that the energy utilization of the composite charge under inner initiation is apparently smaller than that under simultaneous initiation.</p>","PeriodicalId":608,"journal":{"name":"Journal of Applied Mechanics and Technical Physics","volume":"65 3","pages":"401 - 413"},"PeriodicalIF":0.5,"publicationDate":"2024-12-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142798244","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
EFFECT OF MOLDING PRESSURE ON CHARACTERISTICS OF RADIOPROTECTIVE COMPOSITES
IF 0.5 4区 工程技术
Journal of Applied Mechanics and Technical Physics Pub Date : 2024-12-09 DOI: 10.1134/S0021894424030106
V. I. Pavlenko, D. S. Romanyuk, V. V. Kashibadze, O. V. Kuprieva
{"title":"EFFECT OF MOLDING PRESSURE ON CHARACTERISTICS OF RADIOPROTECTIVE COMPOSITES","authors":"V. I. Pavlenko,&nbsp;D. S. Romanyuk,&nbsp;V. V. Kashibadze,&nbsp;O. V. Kuprieva","doi":"10.1134/S0021894424030106","DOIUrl":"10.1134/S0021894424030106","url":null,"abstract":"<p>This paper presents the results of a study of the effect of molding pressure on the characteristics of radioprotective composites based on polyethylene and boron carbide (B<sub>4</sub>C). Software simulation is applied to select a temperature range for heating a press mold of a given size. Experiments are performed to determine the required holding time of the composite and identify defects arising from various deviations from the optimal temperature parameters. The strength of samples under various molding pressure conditions is tested, and the optimal pressure is determined. A composite with the following mechanical characteristics under optimal molding conditions is obtained: density (<span>(1.09 pm 0.01)</span>) g/cm<sup>3</sup>, bending strength <span>((5.72 pm 0.18))</span> MPa, and sound velocity in the composite (<span>(2050.00pm 0.01)</span>) m/s.</p>","PeriodicalId":608,"journal":{"name":"Journal of Applied Mechanics and Technical Physics","volume":"65 3","pages":"488 - 495"},"PeriodicalIF":0.5,"publicationDate":"2024-12-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142798396","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
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