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Resource Characteristics of Tubular Copper Electrodes in Electric Arc Plasma Torches¹ 电弧等离子体炬中管状铜电极的资源特征
IF 2.4 4区 工程技术
Journal of Engineering Thermophysics Pub Date : 2023-11-08 DOI: 10.1134/S1810232823030141
A. S. Anshakov, P. V. Domarov, V. A. Faleev
{"title":"Resource Characteristics of Tubular Copper Electrodes in Electric Arc Plasma Torches¹","authors":"A. S. Anshakov,&nbsp;P. V. Domarov,&nbsp;V. A. Faleev","doi":"10.1134/S1810232823030141","DOIUrl":"10.1134/S1810232823030141","url":null,"abstract":"<p>The resource of plasma torches and plasma devices on their basis depends strongly on the rate of destruction (erosion) of the electrodes. Experimental data on the erosion of copper electrodes in DC arc plasma torches are presented. In dependence on the design of plasma devices and their technological applications, the electrodes (cathode and anode) are in different thermal conditions and their resource characteristics differ significantly. The key parameters for optimization of the erosion characteristics during operation of plasma torches with an electrode resource of many hundreds of hours have been established.</p>","PeriodicalId":627,"journal":{"name":"Journal of Engineering Thermophysics","volume":"32 3","pages":"596 - 602"},"PeriodicalIF":2.4,"publicationDate":"2023-11-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"71909570","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
Microchannel Surface Structures for Drag Reduction 用于减阻的微通道表面结构
IF 2.4 4区 工程技术
Journal of Engineering Thermophysics Pub Date : 2023-07-17 DOI: 10.1134/S1810232823020042
D. S. Gluzdov, E. Ya. Gatapova
{"title":"Microchannel Surface Structures for Drag Reduction","authors":"D. S. Gluzdov,&nbsp;E. Ya. Gatapova","doi":"10.1134/S1810232823020042","DOIUrl":"10.1134/S1810232823020042","url":null,"abstract":"<p>There are many different designs of microchannels for fluid transport or heat transfer purposes. The most challenging problem is selecting the shape and boundary structure of the microchannel walls so that they meet all the requirements and be most optimal and efficient at high flow rates. Various studies show that applying superhydrophobic surface to the microchannel walls can significantly reduce drag forces; however, the characteristics of the best surface structure for a superhydrophobic boundary condition are still unknown. To clarify this problem, we have reviewed different possible engineering solutions for surface structure options, their effect on reducing microchannel drag, and compared them in the present paper.</p>","PeriodicalId":627,"journal":{"name":"Journal of Engineering Thermophysics","volume":"32 2","pages":"214 - 241"},"PeriodicalIF":2.4,"publicationDate":"2023-07-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"4681095","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
Influence of Jet Velocity on Critical Heat Flux during Two-Phase Microjet Cooling of Electronics with HFE-7100 射流速度对HFE-7100两相微射流冷却电子器件临界热流密度的影响
IF 2.4 4区 工程技术
Journal of Engineering Thermophysics Pub Date : 2023-07-17 DOI: 10.1134/S1810232823020030
V. V. Kuznetsov, A. S. Shamirzaev, A. S. Mordovskoi
{"title":"Influence of Jet Velocity on Critical Heat Flux during Two-Phase Microjet Cooling of Electronics with HFE-7100","authors":"V. V. Kuznetsov,&nbsp;A. S. Shamirzaev,&nbsp;A. S. Mordovskoi","doi":"10.1134/S1810232823020030","DOIUrl":"10.1134/S1810232823020030","url":null,"abstract":"<p>The influence of the average velocity of jet of HFE-7100 dielectric liquid on the heat transfer and the critical heat flux was experimentally studied with the use of an array of 36 submerged impinging microjets at a large initial subcooling. The heating surface was cooled in a slot-shaped channel with a gap of 1 mm for a distributed array of microjets with diameter of 174 <span>(mu)</span>m. With the distributed array of microjets of dielectric liquid with low heat of vaporization and thermal conductivity, at an initial liquid subcooling of 38.2°C relative to the saturation temperature it was possible to obtain a critical heat flux of 237 W/cm<sup>2</sup> at a jet velocity of 9.56 m/s, which corresponds to a heat release source power of 186 W.</p>","PeriodicalId":627,"journal":{"name":"Journal of Engineering Thermophysics","volume":"32 2","pages":"208 - 213"},"PeriodicalIF":2.4,"publicationDate":"2023-07-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"4681108","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
Effects of Header Configuration on Flow Maldistribution in Plate-Fin Heat Exchangers 封头结构对板翅式换热器流动不均匀分布的影响
IF 2.4 4区 工程技术
Journal of Engineering Thermophysics Pub Date : 2023-07-17 DOI: 10.1134/S1810232823020091
J. J. Tian, M. P. Wu, Z. Zhang, S. Q. Wang, Y. L. Lang, S. Mehendale, Q. Y. Wu, X. X. Wang, J. Y. Wang, H. F. Liou
{"title":"Effects of Header Configuration on Flow Maldistribution in Plate-Fin Heat Exchangers","authors":"J. J. Tian,&nbsp;M. P. Wu,&nbsp;Z. Zhang,&nbsp;S. Q. Wang,&nbsp;Y. L. Lang,&nbsp;S. Mehendale,&nbsp;Q. Y. Wu,&nbsp;X. X. Wang,&nbsp;J. Y. Wang,&nbsp;H. F. Liou","doi":"10.1134/S1810232823020091","DOIUrl":"10.1134/S1810232823020091","url":null,"abstract":"<p>Non-uniform flow distribution among the channels of a heat exchanger (HX) can adversely affect its thermo-hydraulic performance. In this research, various header designs for a plate-fin heat exchanger (PFHX) and a flow data acquisition system were constructed to study the water flow distribution among the channels of the PFHX. These different header configurations were installed at the entrance of the PFHX operating under different flow conditions to evaluate the impact of header structure on flow distribution within the HX and its thermal-hydraulic performance. The conventional header was found to cause severe flow maldistribution at the inlet of the PFHX. The Reynolds number based on channel flow and geometry was seen to significantly affect the flow distribution, which in turn drastically reduced its effectiveness. To improve the conventional header, new headers with different perforated plates were designed and built. Experimental results showed that an improved version of the header is very effective in mitigating the flow maldistribution in the PFHX and thereby enhancing its thermal performance. Engineering correlations relating the flow distribution non-uniformity, HX effectiveness, and the Reynolds number for different header designs were also developed.</p>","PeriodicalId":627,"journal":{"name":"Journal of Engineering Thermophysics","volume":"32 2","pages":"321 - 339"},"PeriodicalIF":2.4,"publicationDate":"2023-07-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"4685931","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
Assessment of Fin Shape and Height and Reservoir Elevation on the Performance of a TEG Cooling System 翅片形状、高度和蓄水池高程对TEG冷却系统性能的影响
IF 2.4 4区 工程技术
Journal of Engineering Thermophysics Pub Date : 2023-07-17 DOI: 10.1134/S1810232823020054
Z. Pouransari, A. M Ranjbar
{"title":"Assessment of Fin Shape and Height and Reservoir Elevation on the Performance of a TEG Cooling System","authors":"Z. Pouransari,&nbsp;A. M Ranjbar","doi":"10.1134/S1810232823020054","DOIUrl":"10.1134/S1810232823020054","url":null,"abstract":"<p>Effect of the reservoir elevation, fin shape and height on the cooling performance of a heat sink equipped with a liquid thermosyphon system, for a thermoelectric generator (TEG) application is studied using numerical simulations. Three pin fin types, namely circular, circular sector and triangular shapes, with a staggered arrangement, are employed for the heat sink and performance of each type for a wide range of fin heights and two hydraulic diameters is demonstrated. It is found that the highest cooling performance is achieved, when the reservoir is placed at the same level as the heat sink. Hence, a more compact TEG-thermosyphon assembly, which requires less space, with better cooling efficiency, compared with traditional designs with the reservoir placed on top of the heat sink, is achieved. Simulations show that the heat sink with circular-sector fins has a better thermal efficiency at a wide range of fin heights, compared with the two other fin shapes, for the current application. It was also found that, with a suitable hydraulic diameter, circular-sector fins can provide reasonably low pressure drop for a wide range of fin heights.</p>","PeriodicalId":627,"journal":{"name":"Journal of Engineering Thermophysics","volume":"32 2","pages":"242 - 255"},"PeriodicalIF":2.4,"publicationDate":"2023-07-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"4681554","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
Experimental Study of a House-Hold Dual Evaporation Temperatures Based Chiller 家用双蒸发温度制冷机的实验研究
IF 2.4 4区 工程技术
Journal of Engineering Thermophysics Pub Date : 2023-07-17 DOI: 10.1134/S181023282302011X
Z. Li, L. Zhang, C. H. Liu, J. B. Chen, M. L. Qu
{"title":"Experimental Study of a House-Hold Dual Evaporation Temperatures Based Chiller","authors":"Z. Li,&nbsp;L. Zhang,&nbsp;C. H. Liu,&nbsp;J. B. Chen,&nbsp;M. L. Qu","doi":"10.1134/S181023282302011X","DOIUrl":"10.1134/S181023282302011X","url":null,"abstract":"<p>Indoor environment control strategies in small buildings are simply considered, such as achieving the indoor temperature control through ON/OFF cycling the compressor of a direct expansion (DX) air conditioning (A/C) system, leaving the indoor humidity uncontrolled. In some areas, the large latent cooling load will lead to an unstable and high indoor humidity, resulting in deteriorating thermal comfort, indoor air quality and energy efficiency, suggesting that an actively controlled humidity is indispensable. The existing temperature and humidity independent control (THIC) methods are too complicated to be suitable for applying in small buildings. Therefore, the authors established a water chiller which can be applied in residential buildings for THIC by using a dual-evaporation-temperature compressor. A prototype was built and experimentally tested. Results showed that in the varying summer condition, the high and low water supplying temperatures were maintained around 18.8°C and 7.8°C, respectively, suggesting that this novel chiller could provide chilled water of two different temperatures for THIC. Furthermore, the energy efficiency ratios (EER) of the compressor was 3.5, which was comparable to those conventional DX A/C systems or chillers of the same size. Therefore, this novel chiller based on dual evaporation temperatures was feasible.</p>","PeriodicalId":627,"journal":{"name":"Journal of Engineering Thermophysics","volume":"32 2","pages":"360 - 377"},"PeriodicalIF":2.4,"publicationDate":"2023-07-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"4685423","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
Investigation of Kinetics of Formation of Methane + Propane Hydrates by Molecular Dynamics Method in the Presence of Hydrate Seed and Sea Salt 水合物种子和海盐存在下甲烷+丙烷水合物形成动力学的分子动力学研究
IF 2.4 4区 工程技术
Journal of Engineering Thermophysics Pub Date : 2023-07-17 DOI: 10.1134/S181023282302008X
R. K. Zhdanov, K. V. Gets, Yu. Yu. Bozhko, O. O. Subboting, V. R. Belosludov
{"title":"Investigation of Kinetics of Formation of Methane + Propane Hydrates by Molecular Dynamics Method in the Presence of Hydrate Seed and Sea Salt","authors":"R. K. Zhdanov,&nbsp;K. V. Gets,&nbsp;Yu. Yu. Bozhko,&nbsp;O. O. Subboting,&nbsp;V. R. Belosludov","doi":"10.1134/S181023282302008X","DOIUrl":"10.1134/S181023282302008X","url":null,"abstract":"<p>In the presented work we studied the process of nucleation and growth of methane and propane gas hydrate from a homogeneous solution by means of molecular dynamics. The aim is to assess the effect of hydrate seed on the growth rate and structure of the resulting hydrate in the presence of sea salt. This process was characterized via calculation of the number of long-lived hydrogen bonds and amount of hydrate and hydrate-like cavities, as well as the order parameter of the intermolecular torsion angles. It is shown that the kinetics of hydrate formation do not differ much in the cases of pure water and seawater. A seed crystal of hydrate on the contrary, not only increases the hydrate growth rate, but also makes the resulting structure more consistent with the cubic structure II hydrate.</p>","PeriodicalId":627,"journal":{"name":"Journal of Engineering Thermophysics","volume":"32 2","pages":"312 - 320"},"PeriodicalIF":2.4,"publicationDate":"2023-07-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"4975898","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
Gas Hydrodynamic Modeling of Operation of Intermittent Gas Lifts 间歇气举运行的气水动力学模型
IF 2.4 4区 工程技术
Journal of Engineering Thermophysics Pub Date : 2023-07-17 DOI: 10.1134/S1810232823020066
E. M. Abbasov, Sh. A. Kerimova
{"title":"Gas Hydrodynamic Modeling of Operation of Intermittent Gas Lifts","authors":"E. M. Abbasov,&nbsp;Sh. A. Kerimova","doi":"10.1134/S1810232823020066","DOIUrl":"10.1134/S1810232823020066","url":null,"abstract":"<p>A model of operation of intermittent gas lift has been constructed. The boundary value problem of nonstationary motion of gas and fluid in a formation-well system has been solved. The time of fluid accumulation in the well at which the volume of fluid production per 24 hours is maximal has been determined. Analytical expressions have been obtained for determination of the cycle time of gas lift operation. Numerical calculations have been carried out.</p>","PeriodicalId":627,"journal":{"name":"Journal of Engineering Thermophysics","volume":"32 2","pages":"256 - 278"},"PeriodicalIF":2.4,"publicationDate":"2023-07-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"4683067","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
Model of the Hydraulic Resistance for the Flow in a Spiral Wounded Column 螺旋损伤柱流动的水力阻力模型
IF 2.4 4区 工程技术
Journal of Engineering Thermophysics Pub Date : 2023-07-17 DOI: 10.1134/S1810232823020133
P. I. Geshev, O. N. Kashinsky
{"title":"Model of the Hydraulic Resistance for the Flow in a Spiral Wounded Column","authors":"P. I. Geshev,&nbsp;O. N. Kashinsky","doi":"10.1134/S1810232823020133","DOIUrl":"10.1134/S1810232823020133","url":null,"abstract":"<p>A model for calculating pressure losses in a spiral wound LNG column has been developed. The model uses the scheme of three flows: two inclined vortex flows in the wall inter-tube spaces, separated by the central flow along the axis of the column. Based on the integral momentum balance theorem, a formula for the hydraulic drag coefficient was derived. To verify the results of the computational model, an experimental setup was built and experiments were conducted. Comparison of the calculations of the hydraulic resistance coefficient according to the model with the measured experimental data shows good agreement.</p>","PeriodicalId":627,"journal":{"name":"Journal of Engineering Thermophysics","volume":"32 2","pages":"389 - 397"},"PeriodicalIF":2.4,"publicationDate":"2023-07-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"4685429","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
Retraction Note: Optimal Design and Analysis of Airfoil Radiator Fins Based on Weakly Compressible Turbulence 基于弱可压缩湍流的翼型散热器翅片优化设计与分析
IF 2.4 4区 工程技术
Journal of Engineering Thermophysics Pub Date : 2023-07-17 DOI: 10.1134/S1810232823020157
C. Lyu, R. Zhan
{"title":"Retraction Note: Optimal Design and Analysis of Airfoil Radiator Fins Based on Weakly Compressible Turbulence","authors":"C. Lyu,&nbsp;R. Zhan","doi":"10.1134/S1810232823020157","DOIUrl":"10.1134/S1810232823020157","url":null,"abstract":"","PeriodicalId":627,"journal":{"name":"Journal of Engineering Thermophysics","volume":"32 2","pages":"405 - 405"},"PeriodicalIF":2.4,"publicationDate":"2023-07-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"4685961","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: 1
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