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On the Kinetic Approach with Allowance for Higher-Order Heterogeneities in the Navier–Stokes Equation 在纳维-斯托克斯方程中考虑高阶异质性的动力学方法
IF 0.6 4区 物理与天体物理
Technical Physics Letters Pub Date : 2024-09-13 DOI: 10.1134/s1063785024700500
S. O. Gladkov, Zaw Aung
{"title":"On the Kinetic Approach with Allowance for Higher-Order Heterogeneities in the Navier–Stokes Equation","authors":"S. O. Gladkov, Zaw Aung","doi":"10.1134/s1063785024700500","DOIUrl":"https://doi.org/10.1134/s1063785024700500","url":null,"abstract":"<h3 data-test=\"abstract-sub-heading\">Abstract</h3><p>A method for deriving the Navier–Stokes equation with allowance for inhomogeneities of any order on the Laplace operator using the Boltzmann kinetic equation is proposed. The solution method is based on the theory of nonequilibrium phenomena and the entropy growth principle. The calculation has been carried out to find additional inhomogeneous terms on the Laplace operator in the right-hand side of the Navier–Stokes equation. New-type fundamental solutions to the stationary parabolic equation have been predicted, which are significant for application in solving some problems of mathematical physics.</p>","PeriodicalId":784,"journal":{"name":"Technical Physics Letters","volume":"377 1","pages":""},"PeriodicalIF":0.6,"publicationDate":"2024-09-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142179535","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Nonlinear Dynamics of Motion of a Cylindrical Body with an Elastic Coupling in a Viscous Continuum 粘性连续介质中具有弹性耦合的圆柱形物体的非线性动力学运动
IF 0.6 4区 物理与天体物理
Technical Physics Letters Pub Date : 2024-08-30 DOI: 10.1134/s1063785024700494
S. O. Gladkov, S. B. Bogdanova
{"title":"Nonlinear Dynamics of Motion of a Cylindrical Body with an Elastic Coupling in a Viscous Continuum","authors":"S. O. Gladkov, S. B. Bogdanova","doi":"10.1134/s1063785024700494","DOIUrl":"https://doi.org/10.1134/s1063785024700494","url":null,"abstract":"<h3 data-test=\"abstract-sub-heading\">Abstract</h3><p>Using the constructed Lagrange function <span>(L)</span> and calculated dissipative function <span>(dot {Q})</span>, a general system of dynamic equations has been obtained to describe the motion of a cylindrical body completely immersed in a fluid. It is assumed that the body is hinged at its one end where the origin of coordinates is selected. The free end can make almost any motions and is elastically held by a spring at an arbitrary point. The problem is solved in a spherical coordinate system in which differential equations of motion are derived in terms of two independent angular variables <span>(theta )</span> and <span>(varphi )</span> taking into account the viscosity <span>(eta )</span> of a continuum.</p>","PeriodicalId":784,"journal":{"name":"Technical Physics Letters","volume":"13 1","pages":""},"PeriodicalIF":0.6,"publicationDate":"2024-08-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142179530","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Features of Dynamics of a Jet Flow Generated on a Laser Heater by Surface Boiling of Liquid 液体表面沸腾在激光加热器上产生的射流动力学特征
IF 0.6 4区 物理与天体物理
Technical Physics Letters Pub Date : 2024-08-29 DOI: 10.1134/s1063785023180086
A. V. Kulik, S. N. Mokrin, A. M. Kraevskii, S. S. Minaev, M. A. Guzev, V. M. Chudnovskii
{"title":"Features of Dynamics of a Jet Flow Generated on a Laser Heater by Surface Boiling of Liquid","authors":"A. V. Kulik, S. N. Mokrin, A. M. Kraevskii, S. S. Minaev, M. A. Guzev, V. M. Chudnovskii","doi":"10.1134/s1063785023180086","DOIUrl":"https://doi.org/10.1134/s1063785023180086","url":null,"abstract":"<h3 data-test=\"abstract-sub-heading\">Abstract</h3><p>It was experimentally found that speeds of hot submerged jets appearing in case of laser induced nucleation boiling of water near the tip of optical fiber submerged in water decrease exponentially with increasing laser power (heat flux). This result was obtained for a closed cylindrical cuvette where hot jets collided with walls and slipped the cuvette boundary transferring heat to it. The obtained result is to be taken into account in performing precise laser–induced surface cleaning inside confined volumes, in developing medical technologies for laser therapy of pathologically changed vessels or cysts, and in other applications.</p>","PeriodicalId":784,"journal":{"name":"Technical Physics Letters","volume":"109 1","pages":""},"PeriodicalIF":0.6,"publicationDate":"2024-08-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142179524","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","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 Periodic Macroroughness on Development of Turbulent Free Convection near a Suddenly-Heated Vertical Plate 周期宏观性对骤热垂直板附近湍流自由对流发展的影响
IF 0.6 4区 物理与天体物理
Technical Physics Letters Pub Date : 2024-08-29 DOI: 10.1134/s1063785023170182
A. M. Levchenya, E. M. Smirnov, S. N. Trunova
{"title":"Effect of Periodic Macroroughness on Development of Turbulent Free Convection near a Suddenly-Heated Vertical Plate","authors":"A. M. Levchenya, E. M. Smirnov, S. N. Trunova","doi":"10.1134/s1063785023170182","DOIUrl":"https://doi.org/10.1134/s1063785023170182","url":null,"abstract":"<p><b>Abstract</b>—The results of numerical simulation of unsteady free convection developing near a suddenly heated plate, on which protrusions in the form of adiabatic cylinders of double height with respect to the diameter are arranged in a staggered order, are presented. The calculations were performed according to the Reynolds equations using a differential model of turbulent stresses. The range of variation of the Grashof number (plotted according to the thickness of the free convective flow), in which a significant intensification of heat transfer can be achieved, has been determined. It is shown that the best conditions for intensification are created if the longitudinal pitch in the array of protrusions is approximately twenty times the diameter of the latter.</p>","PeriodicalId":784,"journal":{"name":"Technical Physics Letters","volume":"30 1","pages":""},"PeriodicalIF":0.6,"publicationDate":"2024-08-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142179525","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Investigation of the Process of Emulsion Droplets Coalescence in an Inhomogeneous Alternating Electric Field in the Presence of an Asphaltene Interfacial Film at the Oil–Water Interface 油水界面存在沥青质界面膜时非均相交变电场中乳状液液滴凝聚过程的研究
IF 0.6 4区 物理与天体物理
Technical Physics Letters Pub Date : 2024-08-29 DOI: 10.1134/s1063785023170194
A. I. Mullayanov, R. Sh. Osipova, A. A. Musin, L. A. Kovaleva
{"title":"Investigation of the Process of Emulsion Droplets Coalescence in an Inhomogeneous Alternating Electric Field in the Presence of an Asphaltene Interfacial Film at the Oil–Water Interface","authors":"A. I. Mullayanov, R. Sh. Osipova, A. A. Musin, L. A. Kovaleva","doi":"10.1134/s1063785023170194","DOIUrl":"https://doi.org/10.1134/s1063785023170194","url":null,"abstract":"<p><b>Abstract</b>—The behavior of a “water-in-oil” emulsion stabilized with asphaltenes under the action of an inhomogeneous alternating electric field has been studied. The experimental technique was based on the use of microfluidics, optical microscopy, and high-speed video filming. The dependences of quantitative estimates of the parameters characterizing the dynamics of the emulsion destruction on the frequency and amplitude of the applied field have been obtained. The technique will be useful in developing efficient methods for breaking emulsions and modifying the existing technologies for separating oil emulsions into phases.</p>","PeriodicalId":784,"journal":{"name":"Technical Physics Letters","volume":"74 1","pages":""},"PeriodicalIF":0.6,"publicationDate":"2024-08-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142179498","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Array Radio Imaging Based on Heterodyne Detection with Application of the Continuous-Wave Radar Technique 基于异频探测的阵列无线电成像技术与连续波雷达技术的应用
IF 0.6 4区 物理与天体物理
Technical Physics Letters Pub Date : 2024-08-29 DOI: 10.1134/s1063785023180074
S. A. Korolyov, A. V. Goryunov, V. V. Parshin
{"title":"Array Radio Imaging Based on Heterodyne Detection with Application of the Continuous-Wave Radar Technique","authors":"S. A. Korolyov, A. V. Goryunov, V. V. Parshin","doi":"10.1134/s1063785023180074","DOIUrl":"https://doi.org/10.1134/s1063785023180074","url":null,"abstract":"<h3 data-test=\"abstract-sub-heading\">Abstract</h3><p>A new approach to the creation of millimeter-wave radio imaging systems is proposed. This approach is based on the use of an array receiver consisting of a densely packed (pixel size of 4 mm) array of planar mixers located in the focal plane of a quasi-optical objective, with application of the frequency-modulated continuous-wave radar technique. It has been demonstrated that the implementation of the heterodyne type of reception makes it possible to increase the distance range of the array radio imaging system up to ~100 m while maintaining the angular resolution at the previous level.</p>","PeriodicalId":784,"journal":{"name":"Technical Physics Letters","volume":"82 1","pages":""},"PeriodicalIF":0.6,"publicationDate":"2024-08-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142179517","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Investigation of the Interfacial Tension at the Interface Between Water and Asphaltene Solution in Toluene 水与甲苯中沥青溶液界面的界面张力研究
IF 0.6 4区 物理与天体物理
Technical Physics Letters Pub Date : 2024-08-29 DOI: 10.1134/s1063785023180190
R. R. Zinnatullin, A. I. Iskandarov, L. A. Kovaleva
{"title":"Investigation of the Interfacial Tension at the Interface Between Water and Asphaltene Solution in Toluene","authors":"R. R. Zinnatullin, A. I. Iskandarov, L. A. Kovaleva","doi":"10.1134/s1063785023180190","DOIUrl":"https://doi.org/10.1134/s1063785023180190","url":null,"abstract":"<h3 data-test=\"abstract-sub-heading\">Abstract</h3><p>The dynamics of the interfacial tension coefficient at the interface between water and model solutions of asphaltenes of different concentrations in toluene has been studied. It has been shown that, over time, the interfacial tension decreases due to the adsorption of asphaltene molecules at the interface. With an increase in the concentration of asphaltenes in the solution, the decrease in interfacial tension occurs more intensively. The results of a study of the elongation of a water drop in a solution under the influence of an electric field are presented. It is shown that after the formation of an adsorption film, a higher electric field must be applied to stretch the droplet, and the relative elongation depends nonlinearly on the applied voltage.</p>","PeriodicalId":784,"journal":{"name":"Technical Physics Letters","volume":"10 5 1","pages":""},"PeriodicalIF":0.6,"publicationDate":"2024-08-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142179528","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
The Influence of Carbon Black Content on Temperature Dependences of Electrical Conductivity of Polymer Composite 炭黑含量对聚合物复合材料电导率温度依赖性的影响
IF 0.6 4区 物理与天体物理
Technical Physics Letters Pub Date : 2024-08-29 DOI: 10.1134/s1063785023180219
A. M. Zyuzin, A. A. Karpeev, N. V. Yantsen
{"title":"The Influence of Carbon Black Content on Temperature Dependences of Electrical Conductivity of Polymer Composite","authors":"A. M. Zyuzin, A. A. Karpeev, N. V. Yantsen","doi":"10.1134/s1063785023180219","DOIUrl":"https://doi.org/10.1134/s1063785023180219","url":null,"abstract":"<h3 data-test=\"abstract-sub-heading\">Abstract</h3><p>It was found that in the region of the percolation threshold, depending on the dominance of one or another conduction mechanism, the temperature dependence of the specific volume resistivity ρ(<i>T</i>) of the polymer composite based on a matrix of ethylene vinyl acetate is significantly transformed. With an increase in the CB content, there is a decrease by several orders of magnitude in the maximum value of the relative resistivity ρ(<i>T</i>)<sub>max</sub>/ρ<sub>20</sub> in its temperature dependence. Peroxide crosslinking of matrix macromolecules leads to a change in the nature of the temperature dependence of resistivity.</p>","PeriodicalId":784,"journal":{"name":"Technical Physics Letters","volume":"30 1","pages":""},"PeriodicalIF":0.6,"publicationDate":"2024-08-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142179568","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
The Intermolecular Interaction Influence on Non-Linear Optical Properties in COANP–Carbon Nanoparticles System COANP - 碳纳米颗粒体系中分子间相互作用对非线性光学特性的影响
IF 0.6 4区 物理与天体物理
Technical Physics Letters Pub Date : 2024-08-29 DOI: 10.1134/s1063785023180098
S. V. Likhomanova, N. V. Kamanina
{"title":"The Intermolecular Interaction Influence on Non-Linear Optical Properties in COANP–Carbon Nanoparticles System","authors":"S. V. Likhomanova, N. V. Kamanina","doi":"10.1134/s1063785023180098","DOIUrl":"https://doi.org/10.1134/s1063785023180098","url":null,"abstract":"<h3 data-test=\"abstract-sub-heading\">Abstract</h3><p>The main results of non-linear optical, spectral and current–voltage characteristics research of pyridine organic conjugated molecule-carbon nanoparticles combined system have been presented. The perspective of these materials further study in global trends of modern search of materials for optical limiting has been demonstrated also in the present paper.</p>","PeriodicalId":784,"journal":{"name":"Technical Physics Letters","volume":"15 1","pages":""},"PeriodicalIF":0.6,"publicationDate":"2024-08-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142179519","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Plasma-Chemical Method of Silicon Carbide Modification to Obtain Particles with Controlled Surface Morphology 用等离子体化学方法对碳化硅进行改性以获得表面形态可控的颗粒
IF 0.6 4区 物理与天体物理
Technical Physics Letters Pub Date : 2024-08-29 DOI: 10.1134/s1063785023180189
T. A. Shalygina, M. S. Rudenko, I. V. Nemtsev, V. A. Parfenov, S. Yu. Voronina
{"title":"Plasma-Chemical Method of Silicon Carbide Modification to Obtain Particles with Controlled Surface Morphology","authors":"T. A. Shalygina, M. S. Rudenko, I. V. Nemtsev, V. A. Parfenov, S. Yu. Voronina","doi":"10.1134/s1063785023180189","DOIUrl":"https://doi.org/10.1134/s1063785023180189","url":null,"abstract":"<h3 data-test=\"abstract-sub-heading\">Abstract</h3><p>A plasma-chemical method for the modification of silicon carbide particles is presented, which makes it possible to obtain particles with a controlled surface morphology. The variable parameter of particle processing was the ratio of the fraction of plasma-forming (Ar) and additional (H) gases. It was shown that at Ar/H = 100/0, the formation of a carbon shell is observed; at Ar/H ratios of 91/9 and 84/16, the particles are characterized by a carbon shell decorated with silicon nanoparticles or nanowires, respectively. The modified particles were analyzed using scanning electron microscopy and Raman spectroscopy.</p>","PeriodicalId":784,"journal":{"name":"Technical Physics Letters","volume":"171 1","pages":""},"PeriodicalIF":0.6,"publicationDate":"2024-08-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142179526","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","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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