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Steady and unsteady numerical investigation of mixed convective heat transfer enhancement in a channel with baffles attached to the heated wall 带加热壁挡板的通道中混合对流传热增强的稳定和非稳定数值研究
IF 0.5 4区 工程技术
Thermophysics and Aeromechanics Pub Date : 2024-10-17 DOI: 10.1134/S0869864324020069
H. Toumi, R. Henniche, A. Korichi
{"title":"Steady and unsteady numerical investigation of mixed convective heat transfer enhancement in a channel with baffles attached to the heated wall","authors":"H. Toumi,&nbsp;R. Henniche,&nbsp;A. Korichi","doi":"10.1134/S0869864324020069","DOIUrl":"10.1134/S0869864324020069","url":null,"abstract":"<div><p>Numerical computation of aiding mixed convection and heat transfer characteristics in a channel with a baffled heated wall is carried out in this work. The equations of mass, momentum and energy, alongside the boundary conditions, are solved by the finite volume formulation using the open source OpenFOAM® code. Simulations are accomplished under different parameter combinations, including the Reynolds number, Grashof number, and baffle dimension. The results are presented in terms of streamlines, isotherm contours, Nusselt number, and friction factor. The results obtained revealed that the flow translates from steady to unsteady state at a relatively low value of Reynolds number. The unsteady flow behaviour contributes to improve heat transfer by disturbing the near-wall region. The augmentation of velocity and baffle dimension leads to a notable heat transfer enhancement; however, this enhancement is less sensitive to the heating intensity augmentation.</p></div>","PeriodicalId":800,"journal":{"name":"Thermophysics and Aeromechanics","volume":"31 2","pages":"255 - 272"},"PeriodicalIF":0.5,"publicationDate":"2024-10-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142443321","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
On the influence of multi-walled carbon nanotube additives on the rheology of hydrocarbon-based drilling fluids 多壁碳纳米管添加剂对碳氢化合物基钻井液流变性的影响
IF 0.5 4区 工程技术
Thermophysics and Aeromechanics Pub Date : 2024-10-17 DOI: 10.1134/S0869864324020148
E. I. Lysakova, A. D. Skorobogatova, A. L. Neverov, M. I. Pryazhnikov, A. V. Minakov
{"title":"On the influence of multi-walled carbon nanotube additives on the rheology of hydrocarbon-based drilling fluids","authors":"E. I. Lysakova,&nbsp;A. D. Skorobogatova,&nbsp;A. L. Neverov,&nbsp;M. I. Pryazhnikov,&nbsp;A. V. Minakov","doi":"10.1134/S0869864324020148","DOIUrl":"10.1134/S0869864324020148","url":null,"abstract":"<div><p>The paper presents the results of experimental studies on the effect of multi-walled carbon nanotubes (MWCNTs) additives on the viscosity and rheological characteristics of drilling emulsions based on mineral oil. The formulations of typical drilling fluids containing 65% hydrocarbon phase were modified with nanotubes. The mass concentration of nanotubes in emulsion varied from 0.1 to 0.5%. The formulation and method of preparing stable drilling emulsions with MWCNT additives have been proposed. The rheology of drilling emulsions modified with MWCNTs was studied. The dependency of rheological characteristics on the nanotubes concentration was obtained. In general, MWCNT additives can significantly alter the rheological characteristics of drilling hydrocarbon emulsions at lower concentrations compared to the additives in the form of spherical nanoparticles. This is very important for their practical use in industry. The optimal concentration of MWCNTs for controlling the rheological properties of drilling emulsions is about 0.25 wt. %.</p></div>","PeriodicalId":800,"journal":{"name":"Thermophysics and Aeromechanics","volume":"31 2","pages":"355 - 362"},"PeriodicalIF":0.5,"publicationDate":"2024-10-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142443189","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
Analysis of superheated steam influence on the content of solid carbon particles during diffusion combustion of liquid hydrocarbon fuel 过热蒸汽对液态碳氢化合物燃料扩散燃烧过程中固体碳颗粒含量的影响分析
IF 0.5 4区 工程技术
Thermophysics and Aeromechanics Pub Date : 2024-10-17 DOI: 10.1134/S0869864324020136
E. P. Kopyev
{"title":"Analysis of superheated steam influence on the content of solid carbon particles during diffusion combustion of liquid hydrocarbon fuel","authors":"E. P. Kopyev","doi":"10.1134/S0869864324020136","DOIUrl":"10.1134/S0869864324020136","url":null,"abstract":"<div><p>The study is aimed at clarifying and revealing the basic principles of the effect of superheated steam and its parameters on the content of solid carbon particles (soot) in intermediate and final combustion products when burning liquid hydrocarbon fuel. Using a laboratory atmospheric atomizing burner, it was determined that there is a significant amount of solid carbon particles at the base of the burner flame. When heated air is used instead of steam, an increase in soot content by ∼75 % is observed. The analysis of the flame glow intensity in a narrow ultraviolet band also showed that in air the glow values are ∼75 % higher than when using superheated steam. At the same time, it has been established that the soot content in the final combustion products is affected only by the parameter of the dynamic effect of a jet, which determines air ejection from the environment both into the gas generation chamber and into the external flame region.</p></div>","PeriodicalId":800,"journal":{"name":"Thermophysics and Aeromechanics","volume":"31 2","pages":"345 - 354"},"PeriodicalIF":0.5,"publicationDate":"2024-10-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142443323","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
Modeling the thermophysical characteristics of polymer composites in the curing process 聚合物复合材料在固化过程中的热物理特性建模
IF 0.5 4区 工程技术
Thermophysics and Aeromechanics Pub Date : 2024-10-17 DOI: 10.1134/S0869864324020124
O. S. Dmitriev, A. A. Barsukov, D. Ya. Barinov
{"title":"Modeling the thermophysical characteristics of polymer composites in the curing process","authors":"O. S. Dmitriev,&nbsp;A. A. Barsukov,&nbsp;D. Ya. Barinov","doi":"10.1134/S0869864324020124","DOIUrl":"10.1134/S0869864324020124","url":null,"abstract":"<div><p>Constructing models of thermophysical characteristics of polymer composite materials in the curing process is a highly pressing task that is substantiated in this paper. A mathematical model of hot curing of polymer composites based on a thermosetting resin in a mold is presented. Based on experimental temperature dependences of thermophysical characteristics measured under different conditions, modeling dependences of the volume heat capacity and thermal conductivity of fiber, fabric and granular polymer composites on the degree of cure and resin fraction during curing are obtained, with their distinctive feature being the replacement of the properties of a porous reinforcing filler with those of the cured resin in the model. The results of experiments and calculations are presented. The proposed models of thermophysical characteristics increase the accuracy of process modeling and calculation of optimal temperature-time curing cycles.</p></div>","PeriodicalId":800,"journal":{"name":"Thermophysics and Aeromechanics","volume":"31 2","pages":"329 - 343"},"PeriodicalIF":0.5,"publicationDate":"2024-10-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142443320","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
Study of helium permeability for silica microspheres 二氧化硅微球的氦渗透性研究
IF 0.5 4区 工程技术
Thermophysics and Aeromechanics Pub Date : 2024-10-17 DOI: 10.1134/S0869864324020112
M. V. Frolov, A. S. Vereshchagin, I. V. Kazanin
{"title":"Study of helium permeability for silica microspheres","authors":"M. V. Frolov,&nbsp;A. S. Vereshchagin,&nbsp;I. V. Kazanin","doi":"10.1134/S0869864324020112","DOIUrl":"10.1134/S0869864324020112","url":null,"abstract":"<div><p>This paper presents the study of permeability of helium through walls of hollow glass silica microspheres, which can be used as membranes for gas flow. The study was performed in a special setup for measuring the kinetic sorption curves for helium at given pressure and temperature. A mathematical model based on a mono-dispersion distribution was used for approximating the experimental data. The data was obtained for the temperature range 21.5–110.0 °C. The helium permeability of microsphere walls and the activation energy for helium sorption by microspheres were defined for this temperature range.</p></div>","PeriodicalId":800,"journal":{"name":"Thermophysics and Aeromechanics","volume":"31 2","pages":"321 - 327"},"PeriodicalIF":0.5,"publicationDate":"2024-10-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142443324","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
Modification of the DSMC method for a macroscopic chemical reaction 修改宏观化学反应的 DSMC 方法
IF 0.5 4区 工程技术
Thermophysics and Aeromechanics Pub Date : 2024-10-17 DOI: 10.1134/S086986432402015X
R. Zakeri, R. Kamali-Moghadam, M. Mani
{"title":"Modification of the DSMC method for a macroscopic chemical reaction","authors":"R. Zakeri,&nbsp;R. Kamali-Moghadam,&nbsp;M. Mani","doi":"10.1134/S086986432402015X","DOIUrl":"10.1134/S086986432402015X","url":null,"abstract":"<div><p>Considering some limitations of various macroscopic chemical reaction models including the total collision energy (TCE) and general collision energy (GCE) models, the new modification is implemented in the DSMC algorithm for numerical simulation of dissociation of the air along the stagnation line and around a typical hypersonic atmospheric blunt body, STS-2 in un-equilibrium conditions and modified model is compared with others conventional models. Since the TCE and GCE models are dependent on some experimental parameters <i>(A</i> and <i>B</i> in the Arrhenius equation for the reaction rate), also, due to the lack of accuracy of the QK model, modification version of chemical reaction models is presented as a hybrid of modified quantum kinetics (MQK) and modified collision energy (MCE) which this method is able to extract <i>A</i> and <i>B</i> parameters without need of experimental background. The accuracy of the current applied chemical model for the calculation of flow field characteristics is assessed by comparison of their results with other methods (analytical models and available experimental data). The results indicate that the modification of hybrid model with advantages of the independency of the empirical parameters gives more accurate results and provides more accurate solution compared to conventional methods without need of <i>A</i> and <i>B</i> constant experimental parameters.</p></div>","PeriodicalId":800,"journal":{"name":"Thermophysics and Aeromechanics","volume":"31 2","pages":"363 - 374"},"PeriodicalIF":0.5,"publicationDate":"2024-10-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142443188","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
Modeling shock-wave cells at the initial region of the underexpanded supersonic jet 低膨胀超音速射流初始区域的冲击波单元建模
IF 0.5 4区 工程技术
Thermophysics and Aeromechanics Pub Date : 2024-10-17 DOI: 10.1134/S0869864324020094
I. A. Shirokov, T. G. Elizarova
{"title":"Modeling shock-wave cells at the initial region of the underexpanded supersonic jet","authors":"I. A. Shirokov,&nbsp;T. G. Elizarova","doi":"10.1134/S0869864324020094","DOIUrl":"10.1134/S0869864324020094","url":null,"abstract":"<div><p>Supersonic underexpanded air jet modeling based on the QGD algorithm is carried out. The process of jet flow evolution and the formation of unsteady flow regions are investigated to obtain a good qualitative and quantitative agreement of the results with experimental and simulation data, known from the literature. The QGD algorithm is shown to enable studies of the structure of shock-wave cells at the initial region of the flow and to describe the general character of the turbulent jet.</p></div>","PeriodicalId":800,"journal":{"name":"Thermophysics and Aeromechanics","volume":"31 2","pages":"301 - 311"},"PeriodicalIF":0.5,"publicationDate":"2024-10-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142443191","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 study of evaporation and heat and mass transfer inside the nozzle of a catalytic reformer of diesel fuel 柴油催化重整器喷嘴内的蒸发和传热传质数值研究
IF 0.5 4区 工程技术
Thermophysics and Aeromechanics Pub Date : 2024-10-17 DOI: 10.1134/S086986432402001X
M. Yu. Hrebtov, M. O. Zheribor, R. I. Mullyadzhanov, D. I. Potemkin, P. V. Snytnikov
{"title":"Numerical study of evaporation and heat and mass transfer inside the nozzle of a catalytic reformer of diesel fuel","authors":"M. Yu. Hrebtov,&nbsp;M. O. Zheribor,&nbsp;R. I. Mullyadzhanov,&nbsp;D. I. Potemkin,&nbsp;P. V. Snytnikov","doi":"10.1134/S086986432402001X","DOIUrl":"10.1134/S086986432402001X","url":null,"abstract":"<div><p>In the presented work, the process of heat and mass transfer inside an original design nozzle for a catalytic reformer of diesel fuel in a low-mass-flux mode is investigated by direct numerical simulation using Open FOAM open-source code. The main goal of a new nozzle design is to increase the rate and degree of fuel evaporation, as well as to improve the mixing characteristics of diesel fuel with superheated water vapor before the reaction mixture passes through the catalyst. Inside the nozzle, there are two regions where flows with opposite swirl directions are created; this leads to a strong velocity shear inside the nozzle, intensifying the mixing processes. Simulations were carried out in the Eulerian-Lagrangian formulation, taking into account the processes of evaporation of fuel droplets. The simulation results show that the flow at the outlet of the nozzle has a good uniformity of the mixture composition and provides a high degree of fuel evaporation at the early stages of flow development.</p></div>","PeriodicalId":800,"journal":{"name":"Thermophysics and Aeromechanics","volume":"31 2","pages":"193 - 209"},"PeriodicalIF":0.5,"publicationDate":"2024-10-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142443318","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
On the mechanisms of interaction of controlled disturbances in the longitudinal wake region in a supersonic boundary layer on a flat plate 论平板上超音速边界层纵向尾流区受控扰动的相互作用机理
IF 0.5 4区 工程技术
Thermophysics and Aeromechanics Pub Date : 2024-10-17 DOI: 10.1134/S0869864324020021
A. D. Kosinov, N. V. Semionov, M. V. Piterimova, A. A. Yatskikh, Yu. G. Yermolaev, B. V. Smorodskii, A. V. Shmakova
{"title":"On the mechanisms of interaction of controlled disturbances in the longitudinal wake region in a supersonic boundary layer on a flat plate","authors":"A. D. Kosinov,&nbsp;N. V. Semionov,&nbsp;M. V. Piterimova,&nbsp;A. A. Yatskikh,&nbsp;Yu. G. Yermolaev,&nbsp;B. V. Smorodskii,&nbsp;A. V. Shmakova","doi":"10.1134/S0869864324020021","DOIUrl":"10.1134/S0869864324020021","url":null,"abstract":"<div><p>The present study is aimed at searching for mechanisms of wave interaction in a supersonic boundary layer on a flat plate with the flow being distorted by a streamwise disturbance generated on a sharp leading edge by a pair of weak shock waves. The space and time distributions and the frequency-wave spectra of oscillations and their wave characteristics in the linear and weakly nonlinear phases of wave train development in a nonhomogeneous boundary layer under conditions of a fixed power of the local source of controlled disturbances are analyzed. Based on experimental results, possible variants of wave interaction in a supersonic boundary layer on a flat plate in the region of the longitudinal wake generated by an N-wave are proposed.</p></div>","PeriodicalId":800,"journal":{"name":"Thermophysics and Aeromechanics","volume":"31 2","pages":"211 - 225"},"PeriodicalIF":0.5,"publicationDate":"2024-10-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142443192","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
Personalized numerical simulation for hemodynamics of abdominal aortic aneurysm: analysis of simulation results sensitivity to the input boundary conditions 腹主动脉瘤血液动力学的个性化数值模拟：模拟结果对输入边界条件的敏感性分析
IF 0.5 4区 工程技术
Thermophysics and Aeromechanics Pub Date : 2024-10-17 DOI: 10.1134/S0869864324020161
Ya. V. Fedotova, R. Yu. Epifanov, I. I. Volkova, M. S. Maus, N. A. Nikitin, S. A. Aivazov, M. Yu. Khrebtov, A. A. Karpenko, R. I. Mullyadzhanov
{"title":"Personalized numerical simulation for hemodynamics of abdominal aortic aneurysm: analysis of simulation results sensitivity to the input boundary conditions","authors":"Ya. V. Fedotova,&nbsp;R. Yu. Epifanov,&nbsp;I. I. Volkova,&nbsp;M. S. Maus,&nbsp;N. A. Nikitin,&nbsp;S. A. Aivazov,&nbsp;M. Yu. Khrebtov,&nbsp;A. A. Karpenko,&nbsp;R. I. Mullyadzhanov","doi":"10.1134/S0869864324020161","DOIUrl":"10.1134/S0869864324020161","url":null,"abstract":"<div><p>The analysis was performed for input condition sensitivity of hemodynamic simulation performed for a zone of abdominal aortic aneurysm. We took three versions of patient-specific configurations of aneurysm decease and computed the haemodynamics with different spatial and velocity profiles at the aorta inlet. Their impact on hemodynamic characteristics was evaluated. At total, the study was performed for three spatial variants (uniform, parabolic, and parabolic-and-secondary-flow velocity profiles) and three versions of time behavior of velocity profiles: this produces nine cases for every of three chosen geometries. The study demonstrated that one can neglect the impact of the spatial profile for inlet velocity (including the non-coaxial velocity vector components). Meanwhile, the value of reverse diastolic flow is significant for the solution. However, simulation in the zone of abdominal aortic aneurysm does not demonstrate great differences in simulation results for the values of wall shear stress and velocity for the data averaged over a cardiac cycle. For the distribution of the oscillation index of shear, the maximum deviation from the basic solution is about ∼ 10 %, which is quite acceptable for clinical applications.</p></div>","PeriodicalId":800,"journal":{"name":"Thermophysics and Aeromechanics","volume":"31 2","pages":"375 - 391"},"PeriodicalIF":0.5,"publicationDate":"2024-10-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142443322","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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