Technical Physics最新文献

{"title":"Phase Equilibria of Benzyl Alcohol with Carbon Dioxide and Propane","authors":"Q. M. Phan,&nbsp;S. V. Mazanov,&nbsp;R. R. Nakipov,&nbsp;Z. I. Zaripov,&nbsp;F. M. Gumerov","doi":"10.1134/S1063784224700919","DOIUrl":"10.1134/S1063784224700919","url":null,"abstract":"<p>An analysis of the phase behavior of binary systems is presented, including one of the representatives of aromatic alcohols (phenyl ethanol) and two potential extractants intended for use in the supercritical fluid (SCF) state. The study of the phase state of the thermodynamic systems “CO₂–benzyl alcohol” and “propane–benzyl alcohol” in the near-critical region of the state has been carried out using a high-pressure optical cell. For the first time, data on phase equilibria of the “propane–benzyl alcohol” system have been obtained. The states of different phases are fixed.</p>","PeriodicalId":783,"journal":{"name":"Technical Physics","volume":"69 10","pages":"2507 - 2509"},"PeriodicalIF":1.1,"publicationDate":"2025-02-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143404152","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}

{"title":"Decrease in Concentration of Nitrogen Oxides by Changing the Combustion Chamber Design of the Gas-Turbine Engine","authors":"A. V. Baklanov","doi":"10.1134/S1063784224700944","DOIUrl":"10.1134/S1063784224700944","url":null,"abstract":"<p>Results of modeling the processes in the multisprayer combustion chamber of the gas-turbine engine operating on a gaseous fuel are presented. Two options of the combustion chamber (basic and modernized) are considered. The basic option is analyzed and design shortcomings are revealed. The design is also improved by inserting plugs on the rings of a flue tube, by redistributing openings over the length of the flue tube and by changing the nozzle design. The results of calculations confirm the effectiveness of the measures taken for reducing the concentration of nitrogen oxides in combustion products.</p>","PeriodicalId":783,"journal":{"name":"Technical Physics","volume":"69 10","pages":"2495 - 2500"},"PeriodicalIF":1.1,"publicationDate":"2025-02-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143404153","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}

{"title":"Analyzing Resource Saving and Environmental Safety in Oil and Gas Waste Processing System to Provide Sustainable Development","authors":"M. Yu. Derevyanov,&nbsp;Yu. E. Pleshivtseva,&nbsp;A. A. Afinogentov,&nbsp;A. G. Mandra","doi":"10.1134/S1063784224700798","DOIUrl":"10.1134/S1063784224700798","url":null,"abstract":"<p>The problems of environmental safety and resource conservation in processing industrial waste at Russian oil and gas facilities are becoming more and more significant, especially in the context of current trends focused on decarbonization and sustainable development. The growth of industrial waste is not compensated by corresponding growth in the volume and quality of processing since only 10% of oil-containing waste is processed, and the rest is buried or incinerated, which has an additional harmful impact on the environment. This paper proposes a new approach to multifactor analysis of resource conservation and environmental safety in the integrated processing of industrial waste from oil and gas facilities to achieve sustainable development goals. The algorithm developed by the authors, the theoretical basis of which is the method of data envelopment analysis (DEA), determines the sequence of solving interrelated problems of multifactor comparison of objects of the waste processing system by heterogeneous quality criteria: resource value, resource potential, resource saving and environmental safety. These issues are formulated on the basis of a super-efficiency model of the DEA method as a mathematical programming problem. The presented and tested approach to the multifactor analysis of resource conservation and environmental safety of the waste treatment system allows (1) to obtain and analyze relative comparative assessments of waste storage facilities and technologies regarding heterogeneous quality criteria and (2) to form local and general decision-making strategies for sustainable development goals. The proposed approach appears promising for multiple prospective applications in the oil-bearing regions of the Russian Federation, where the growth in the formation of industrial waste has severe and irreversible environmental consequences.</p>","PeriodicalId":783,"journal":{"name":"Technical Physics","volume":"69 9","pages":"2447 - 2453"},"PeriodicalIF":1.1,"publicationDate":"2025-02-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143404156","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}

{"title":"Improving the Safety of TPP and NPP Thermal Power Equipment through Noise Reduction Using Acoustic Barriers with Modified Top Edge","authors":"V. B. Tupov,&nbsp;A. B. Mukhametov","doi":"10.1134/S1063784224700750","DOIUrl":"10.1134/S1063784224700750","url":null,"abstract":"<p>The paper provides data based on an analysis of the results of mathematical modeling in COMSOL Multiphysics software, which allow to determine the acoustic efficiency of a noise barrier with cylindrical top device depending on the height of the barrier, the diameter of the device and the position of the cylindrical device relative to the top edge of the barrier. It was determined that a higher barrier increased the length of interference region (the region of local maxima and minima of the top device efficiency) and significantly affects the acoustic efficiency of the top device at octave bands of 250, 500, 1000 and 2000 Hz. The cylindrical device with the installation angle α_inst = 90° was found to be the most efficient for a constant distance of 5 m from the noise source to the barrier in all cases. It is shown that the acoustic efficiency of the top device with different angles remains almost constant when the barrier height is increased from 1 to 2 m. When the barrier height was increased to between 3 and 5 m, the acoustic efficiency of the device increased by about 2 dBA. The acoustic efficiency of the cylindrical device was found to increase by 2 or 3 dBA on average as the top device diameter increased from 0.2 to 0.5 m.</p>","PeriodicalId":783,"journal":{"name":"Technical Physics","volume":"69 9","pages":"2482 - 2487"},"PeriodicalIF":1.1,"publicationDate":"2025-02-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143404224","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}

{"title":"A Method for Modeling the Transformation of Epidemic Scenarios during the Propagation of Waves of Convergent SARS-CoV-2 Variants","authors":"A. Yu. Perevaryukha","doi":"10.1134/S1063784224700877","DOIUrl":"10.1134/S1063784224700877","url":null,"abstract":"&lt;p&gt;The study of the epidemic waves of mutating coronavirus involves an analysis of the forms of transient oscillatory modes. Similar phase portraits of oscillators are known in physical problems, but the physical parameters in experiments are constant or controlled. The adaptation of SARS-CoV-2 proteins is unpredictable. Apart from our intuition, there are no methods at present to predict actual mutations in the next season. Renewed virus has returned once again after victory over the infection was declared and the properties of the new COVID wave need to be investigated. The problems of adequacy of modifications of сompartmental models at the current stage of the mutant virus epidemic are in their extensible rather than threshold-change adaptive structure of equations. We classified in our studies the scenarios of COVID-19 epidemics according to the characteristic features of their nonlinear dynamics and forms of oscillation transformations in the physical perspective. We show that the SARS-CoV-2 dynamics since 2020 spring has already changed the mode of autonomous oscillations of infections twice after Omicron BA.1 during spring 2022 and in the autumn 2023. Local epidemics are asynchronous after the global BA.2.86/JN.1 wave in both wave formation and attenuation. The wave epidemic variants were qualitatively different in some countries, such as Japan and Australia. We studied these situations in specific models. Frequent short waves of large amplitude developed in countries previously isolated from the 2020 pandemic wave. In November 2024, we see signs of another qualitative change with a disproportionate increase in the percentage of fatalities without a clear increase in the number of infections. Two strains with signs of convergent mutations appeared synchronously combining adjacent evolutionary branches of the coronavirus. Only the alarming XEC strain, the most evasive to accumulated immunity, began to spread widely. The frequency of XEC infections varies considerably between regions. There is no global epidemic trend at the end of 2024. The number of cases in the new autumn wave of infections was lower than in the past seasons, but the COVID case fatality rate is unexpectedly increasing. It tripled in a month in several countries, which indicates that the epidemic is entering a new stage. We propose a method for modeling the abrupt development of the virus spread based on equations with threshold regulation functions describing variants of infection outbreaks and with situational damping functions determining the form of oscillatory decay for the number of infection cases. A computational experiment simulated the variant of extreme peak development after the stage of local epidemic wave attenuation as a bifurcation scenario. The regional wave with unusual properties is due to the effect of a single mass infection at the appearance of the convergent variant. The declining trend after the primary COVID wave is interrupted in the model during","PeriodicalId":783,"journal":{"name":"Technical Physics","volume":"69 10","pages":"2551 - 2565"},"PeriodicalIF":1.1,"publicationDate":"2025-02-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143404222","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}

{"title":"The Use of the Axial Heat Conduction of the Wall for Increasing the Effectiveness of Heat Exchangers","authors":"E. P. Valueva,&nbsp;Yu. V. Sabirov","doi":"10.1134/S1063784224700762","DOIUrl":"10.1134/S1063784224700762","url":null,"abstract":"<p>The effect of heat transfer in the wall in the direction of the flow of heat carriers on the effectiveness of heat exchangers is considered for the cases when the wall ends are not thermally insulated from the environment. Use is made of the analytic solution to the problem of parallel-plane flow of heat carriers, which has been considered earlier. The solution depends on the following parameters: ratio of coefficients α of heat transfer from heat carriers; ratio of thermal equivalents β of heat carriers (it is assumed that α = β = 1); number <i>Ntu</i> of heat-transfer units; parameter <i>C</i>_<i>A</i> characterizing the axial heat conduction of the wall; the Biot number determining the relative heat transfer from the wall ends to the environment, and the temperatures of the media contacting the wall ends. The effect of the heat conduction the wall increases with decreasing <i>C</i>_<i>A</i>. The following two cases are considered: (case I) the temperatures of the environment are assumed to be equal to the inlet and outlet temperatures of the hot heat carrier; (case II) these temperatures are equal to the inlet and outlet temperatures of the cold heat carrier. It is shown that for large Biot numbers (Bi &gt; 1), the effectiveness of using of one of heat carriers can be elevated due to the effect of the axial heat conduction of the wall; in this case, the temperature of the other heat carrier during its flow in the heat exchanger varies insignificantly. The boundaries of the beginning of the effect of the axial heat conduction of the wall on the effectiveness of the heat exchanger are determined.</p>","PeriodicalId":783,"journal":{"name":"Technical Physics","volume":"69 9","pages":"2488 - 2494"},"PeriodicalIF":1.1,"publicationDate":"2025-02-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143404197","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}

{"title":"Recommendations for the Estimation of Heat Transfer and Critical Heat Fluxes on Boiling Surfaces with Fiber Brush Coatings","authors":"I. A. Popov,&nbsp;Yu. S. Stepanova,&nbsp;R. A. Aksyanov,&nbsp;Yu. F. Gortyshov","doi":"10.1134/S1063784224700890","DOIUrl":"10.1134/S1063784224700890","url":null,"abstract":"<p>Heat transfer on surfaces with fiber brush coatings has been studied for free-convection liquid boiling. The influence of operating and design parameters on heat transfer coefficients and critical heat fluxes has been revealed using a graphical analysis of experimental data. Criterial equations for estimating heat transfer coefficients and critical heat fluxes under the considered boiling conditions have been derived.</p>","PeriodicalId":783,"journal":{"name":"Technical Physics","volume":"69 10","pages":"2566 - 2570"},"PeriodicalIF":1.1,"publicationDate":"2025-02-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143404220","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}

{"title":"Production of Biodiesel Fuel from Shea Butter","authors":"S. V. Mazanov,&nbsp;A. O. Solovyova,&nbsp;A. U. Aetov,&nbsp;I. M. Mubarakshin,&nbsp;R. Z. Musin,&nbsp;A. V. Tarasova","doi":"10.1134/S1063784224700907","DOIUrl":"10.1134/S1063784224700907","url":null,"abstract":"<p>Samples of biodiesel fuel are obtained using the reaction of transesterification of Shea butter in ethanol medium under supercritical conditions. The kinematic viscosity of the product of the transesterification reaction is measured for comparison with the viscosity of biodiesel fuel determined according to international standards. Measured kinematic viscosities of the samples of biodiesel fuel are presented and analyzed.</p>","PeriodicalId":783,"journal":{"name":"Technical Physics","volume":"69 10","pages":"2547 - 2550"},"PeriodicalIF":1.1,"publicationDate":"2025-02-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143404248","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}

{"title":"Analysis of the Thermal Conditions in a Lithium-Ion Battery Pack at Reduced Heat Exchange Rate with the Environment","authors":"G. V. Kuznetsov,&nbsp;E. V. Kravchenko","doi":"10.1134/S106378422470083X","DOIUrl":"10.1134/S106378422470083X","url":null,"abstract":"<p>The use of chemical current sources (CCS) in large stationary electrical energy storage systems (EES) is impossible without solving the problem of their thermal runaway. The runaway may be due to exponential temperature rise in major operating components of the battery. One of the factors that increase electrode and electrolyte temperature in a battery is its lower heat exchange with the environment. This study performs a numerical analysis of the thermal conditions in a Li-ion battery pack at moderate values of external factors affecting the thermal runaway and typical discharge rates for this type of CCS. Thermal resistance between Li-ion battery and the battery pack case was found to greatly reduce heat exchange with the environment. The temperature difference across the battery pack in a practically significant range of variables was from 2 to 16°С. At the same time, the characteristic temperature exceeded in a number of cases its regulated limit value, which created the risk of the battery’s thermal runaway.</p>","PeriodicalId":783,"journal":{"name":"Technical Physics","volume":"69 10","pages":"2527 - 2534"},"PeriodicalIF":1.1,"publicationDate":"2025-02-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143404151","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}

{"title":"Study of Heat Transfer of a Concave Surface of Short Annular Channels under Impact Jets","authors":"Yu. L. Leukhin,&nbsp;P. D. Alekseev","doi":"10.1134/S1063784224700920","DOIUrl":"10.1134/S1063784224700920","url":null,"abstract":"<p>By means of physical and mathematical modeling, convective heat transfer and resistance of an annular channel under jet air impingement on the outer concave surface were investigated. It has been established that, in the studied ranges of variation of geometric and mode characteristics, heat transfer and aerodynamics of short annular channels are determined by the dimensionless parameter <i>A</i>_<i>f</i>, which is the ratio of the total area of the blowout holes to the area of the blown surface. To ensure uniform heat transfer on the concave surface of the channels, it is advisable to use internal perforated pipes with a value of the parameter <i>A</i>_<i>f</i> less than 0.01, and to control heat transfer and intensify it in the required zones, it is possible to use pipes with its higher values. The resistance coefficient of the device decreases with increasing parameter <i>A</i>_<i>f</i> and increases slightly with decreasing Reynolds number. An equation has been obtained for calculating the average heat transfer over the surface, the dimensionless total pressure drop in the device, and the total resistance coefficient in the following ranges of variation of mode and geometric parameters: Re = 873–19.7 × 10³, <i>A</i>_<i>f</i> = (0.94–42.57) × 10^–3, <i>S</i>/<i>d</i>_c = 3.49–24.92, and <i>h</i>/<i>d</i>_c = 4.5–8.1. Assessment of the heat exchange device using the energy efficiency coefficient showed that its optimal value is observed at values of the parameter <i>A</i>_<i>f</i> approximately equal to 0.035–0.040.</p>","PeriodicalId":783,"journal":{"name":"Technical Physics","volume":"69 10","pages":"2535 - 2546"},"PeriodicalIF":1.1,"publicationDate":"2025-02-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143404221","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}