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The Use of the Axial Heat Conduction of the Wall for Increasing the Effectiveness of Heat Exchangers
IF 1.1 4区 物理与天体物理
Technical Physics Pub Date : 2025-02-13 DOI: 10.1134/S1063784224700762
E. P. Valueva, Yu. V. Sabirov
{"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><sub><i>A</i></sub> 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><sub><i>A</i></sub>. 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}
引用次数: 0
Production of Biodiesel Fuel from Shea Butter
IF 1.1 4区 物理与天体物理
Technical Physics Pub Date : 2025-02-13 DOI: 10.1134/S1063784224700907
S. V. Mazanov, A. O. Solovyova, A. U. Aetov, I. M. Mubarakshin, R. Z. Musin, A. V. Tarasova
{"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}
引用次数: 0
Recommendations for the Estimation of Heat Transfer and Critical Heat Fluxes on Boiling Surfaces with Fiber Brush Coatings
IF 1.1 4区 物理与天体物理
Technical Physics Pub Date : 2025-02-13 DOI: 10.1134/S1063784224700890
I. A. Popov, Yu. S. Stepanova, R. A. Aksyanov, Yu. F. Gortyshov
{"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}
引用次数: 0
Analysis of the Thermal Conditions in a Lithium-Ion Battery Pack at Reduced Heat Exchange Rate with the Environment
IF 1.1 4区 物理与天体物理
Technical Physics Pub Date : 2025-02-13 DOI: 10.1134/S106378422470083X
G. V. Kuznetsov, E. V. Kravchenko
{"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}
引用次数: 0
Study of Heat Transfer of a Concave Surface of Short Annular Channels under Impact Jets
IF 1.1 4区 物理与天体物理
Technical Physics Pub Date : 2025-02-13 DOI: 10.1134/S1063784224700920
Yu. L. Leukhin, P. D. Alekseev
{"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><sub><i>f</i></sub>, 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><sub><i>f</i></sub> 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><sub><i>f</i></sub> 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 × 10<sup>3</sup>, <i>A</i><sub><i>f</i></sub> = (0.94–42.57) × 10<sup>–3</sup>, <i>S</i>/<i>d</i><sub>c</sub> = 3.49–24.92, and <i>h</i>/<i>d</i><sub>c</sub> = 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><sub><i>f</i></sub> 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}
引用次数: 0
Vortices Formation and the Condensate Film Surface Shape in Heat Pipes
IF 1.1 4区 物理与天体物理
Technical Physics Pub Date : 2025-02-13 DOI: 10.1134/S1063784224700841
A. V. Seryakov
{"title":"Vortices Formation and the Condensate Film Surface Shape in Heat Pipes","authors":"A. V. Seryakov","doi":"10.1134/S1063784224700841","DOIUrl":"10.1134/S1063784224700841","url":null,"abstract":"<p>The results of numerical and experimental studies of vortex formation near the condensation surface and the shape of the surface of moving condensate film in short linear heat pipes (HP’s) with a Laval nozzle-liked vapour channel are presented.</p>","PeriodicalId":783,"journal":{"name":"Technical Physics","volume":"69 10","pages":"2583 - 2595"},"PeriodicalIF":1.1,"publicationDate":"2025-02-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143404217","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
Analysis of the Oxide Target Cooling Modes in the Production of Iodine Isotopes
IF 1.1 4区 物理与天体物理
Technical Physics Pub Date : 2025-02-13 DOI: 10.1134/S1063784224700816
S. S. Salodkin, Yu. I. Tyurin, V. V. Sokhoreva
{"title":"Analysis of the Oxide Target Cooling Modes in the Production of Iodine Isotopes","authors":"S. S. Salodkin,&nbsp;Yu. I. Tyurin,&nbsp;V. V. Sokhoreva","doi":"10.1134/S1063784224700816","DOIUrl":"10.1134/S1063784224700816","url":null,"abstract":"<p>To ensure the maximal possible production intensity for iodine-based radiopharmaceuticals, various methods for target cooling (e.g., front-side cooling of ТеО<sub>2</sub> target using air, helium, and fine-dispersed water flow) have been investigated. Using the COMSOL Multiphysics simulation software package, the temperature field of the target cooled by different heat carriers have been compared for the production output of iodine.</p>","PeriodicalId":783,"journal":{"name":"Technical Physics","volume":"69 10","pages":"2574 - 2582"},"PeriodicalIF":1.1,"publicationDate":"2025-02-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143404223","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 MHD Heat Exchange in a Liquid Metal Flow through a Tube-in-Channel System under Conditions Close to the Thermonuclear Reactor Blanket Module
IF 1.1 4区 物理与天体物理
Technical Physics Pub Date : 2025-02-13 DOI: 10.1134/S1063784224700774
N. A. Luchinkin, N. G. Razuvanov, O. N. Polyanskaya, I. O. Teplyakov
{"title":"Investigation of MHD Heat Exchange in a Liquid Metal Flow through a Tube-in-Channel System under Conditions Close to the Thermonuclear Reactor Blanket Module","authors":"N. A. Luchinkin,&nbsp;N. G. Razuvanov,&nbsp;O. N. Polyanskaya,&nbsp;I. O. Teplyakov","doi":"10.1134/S1063784224700774","DOIUrl":"10.1134/S1063784224700774","url":null,"abstract":"<p>Heat exchange in a liquid metal upward flow through a tube-in-channel system has been studied experimentally and analytically. The system consists of a vertical tube passing along the axis of a square heated channel that is connected to a natural circulation loop. Experiments have been conducted in the presence of a transverse magnetic field and without it. Probe measurements using longitudinal microthermocouple probes placed both in the tube and in the channel gap have been applied. Heat exchange averaged characteristics have been numerically simulated for experimental conditions. Three basic operating conditions of the cooling loop have been considered: the loop is shut off, the loop is open allowing free circulation in the gap without cooling, and the loop is open and provides cooling. In experiments, the profiles of averaged temperature, the distributions of heat transfer local coefficients, and the pulsation characteristics of flow temperature both in the tube and in the channel gap have been obtained. Calculation data have been compared with experimental results. It has been found that the configuration and structure of the flow significantly depend on the presence of transverse magnetic field and on whether the natural circulation loop is connected and provides cooling.</p>","PeriodicalId":783,"journal":{"name":"Technical Physics","volume":"69 9","pages":"2461 - 2471"},"PeriodicalIF":1.1,"publicationDate":"2025-02-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143404157","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
Specific Features of the Breakup of Hot Liquid Metal Droplets Falling into Cold Water
IF 1.1 4区 物理与天体物理
Technical Physics Pub Date : 2025-02-13 DOI: 10.1134/S1063784224700828
Yu. P. Ivochkin, S. M. Yudin, T. I. Borodina
{"title":"Specific Features of the Breakup of Hot Liquid Metal Droplets Falling into Cold Water","authors":"Yu. P. Ivochkin,&nbsp;S. M. Yudin,&nbsp;T. I. Borodina","doi":"10.1134/S1063784224700828","DOIUrl":"10.1134/S1063784224700828","url":null,"abstract":"<p>The paper presents experimental data of pressure pulses generated by the interaction of liquid Bi, Sn, and Pb with water at room temperature (18°C). The resultant pressure relationships are compared with findings of video recording and with the morphology of crystallized fragmentation products, which allowed to propose an appropriate scenario for the explosive fragmentation process development. Experiments were performed in the ranges of initial temperature and investigated melt mass of 400 to 900°C and 3 to 15 g, respectively. It was confirmed that the explosive fragmentation of hot liquid metal droplets falling into room temperature water produce materials with amorphous structure. It is shown using liquid bismuth as an example that the amorphousness of a material can increase as its volume grows.</p>","PeriodicalId":783,"journal":{"name":"Technical Physics","volume":"69 10","pages":"2517 - 2526"},"PeriodicalIF":1.1,"publicationDate":"2025-02-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143404262","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
Impact of Subcooled Liquid Jet on the Dynamics of Transition from Steady Film Boiling to Intense Heat Transfer Regime
IF 1.1 4区 物理与天体物理
Technical Physics Pub Date : 2025-02-13 DOI: 10.1134/S1063784224700804
T. A. Gubanova, P. K. Kanin, V. V. Yagov, A. R. Zabirov, I. A. Molotova, M. M. Vinogradov
{"title":"Impact of Subcooled Liquid Jet on the Dynamics of Transition from Steady Film Boiling to Intense Heat Transfer Regime","authors":"T. A. Gubanova,&nbsp;P. K. Kanin,&nbsp;V. V. Yagov,&nbsp;A. R. Zabirov,&nbsp;I. A. Molotova,&nbsp;M. M. Vinogradov","doi":"10.1134/S1063784224700804","DOIUrl":"10.1134/S1063784224700804","url":null,"abstract":"<p>The properties of the cooled surface and of liquid coolant significantly affect the heat transfer intensity during film boiling and the temperature of transition to the intense regime. As a result, many current studies are devoted to unsteady cooling of vertical cylinders and balls made of various metals with and without coating. The impact of an effectively point source of perturbation (such as, for example, a submerged jet) on the vapor film during film boiling is also of genuine interest. This paper presents experimental results of cooling a stainless steel ball in a liquid when exposed to a submerged jet of the same liquid. The aim of the study is to experimentally measure the surface temperature during the transition from steady film boiling to the intense heat transfer regime of boiling. Different cooling liquids were used in the experiments including water, ethanol, water-ethanol mixtures, and perfluorohexane. It is shown that the transition to the intense mode of heat transfer occurs in aqueous liquids significantly earlier than in liquids with high alcohol content. Despite the influence of the submerged jet, there was no intense heat transfer regime during film boiling in perfluorohexane.</p>","PeriodicalId":783,"journal":{"name":"Technical Physics","volume":"69 10","pages":"2510 - 2516"},"PeriodicalIF":1.1,"publicationDate":"2025-02-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143404226","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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