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Turbulent cylindrical heat flow visualization in free convection regime 自由对流状态下的湍流圆柱形热流可视化
IF 1.6 4区 物理与天体物理
Indian Journal of Physics Pub Date : 2023-06-26 DOI: 10.1007/s12648-023-02779-9
S. P. Suresha, G. Janardhana Reddy, Hussain Basha, N. S. Venkata Narayanan, Mikhail A. Sheremet
{"title":"Turbulent cylindrical heat flow visualization in free convection regime","authors":"S. P. Suresha,&nbsp;G. Janardhana Reddy,&nbsp;Hussain Basha,&nbsp;N. S. Venkata Narayanan,&nbsp;Mikhail A. Sheremet","doi":"10.1007/s12648-023-02779-9","DOIUrl":"10.1007/s12648-023-02779-9","url":null,"abstract":"<div><p>The present article aims to disclose the silent features of Bejan’s heat flow visualization in turbulent boundary layer flow about a vertical cylinder under the effect of low Reynolds number (LRN) k-ε model. The two-dimensional, incompressible, time-dependent average fluid flow and thermal transport equations are derived based on the considered geometry and the used boundary conditions. Turbulent kinetic energy and turbulent kinetic energy's dissipation rate equations are included to determine the eddy viscosity in the flow regime. Further, the turbulent heat function is constructed and is utilized to describe the concept of Bejan’s thermal flow visualization to explore the advanced flow and heat transport features including isotherms, streamlines along with heatlines in a two-dimensional free convection regime. However, the analytical methods are inadequate to solve the produced coupled nonlinear Navier–Stokes equations. Hence, a numerically efficient finite difference scheme namely the Crank–Nicolson scheme has been employed to solve the present problem. Further, the resultant discretized tridiagonal algebraic equations are solved by using the Thomas algorithm. Computational results are analysed to differentiate the laminar and turbulent flows in view of velocity, energy, heatlines, and streamlines for different parametric values. Due to the industrial applications, the skin-friction coefficient and heat transfer rate are also evaluated. From the current analysis, it is noticed that the momentum transport decreased with rising turbulent Prandtl number. Increasing turbulent Reynolds number suppressed the skin-friction coefficient at the surface of the cylinder.</p></div>","PeriodicalId":584,"journal":{"name":"Indian Journal of Physics","volume":"98 1","pages":"301 - 317"},"PeriodicalIF":1.6,"publicationDate":"2023-06-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1007/s12648-023-02779-9.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"72836610","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Magneto-thermoelastic problem of semi-infinite body considering non-local and memory effects under hydrostatic pressure 考虑静水压力下的非局部效应和记忆效应的半无限体磁热弹性问题
IF 1.6 4区 物理与天体物理
Indian Journal of Physics Pub Date : 2023-06-25 DOI: 10.1007/s12648-023-02776-y
Le Wang, Yongbin Ma
{"title":"Magneto-thermoelastic problem of semi-infinite body considering non-local and memory effects under hydrostatic pressure","authors":"Le Wang,&nbsp;Yongbin Ma","doi":"10.1007/s12648-023-02776-y","DOIUrl":"10.1007/s12648-023-02776-y","url":null,"abstract":"<div><p>This paper investigates the magneto-thermoelastic dynamic response of a homogeneous isotropic ideal thermoelastic semi-infinite body under hydrostatic pressure. Under the background of Ezzat fractional-order heat conduction model of two-temperature generalized magneto-thermic elasticity, a new coupling model is established under the background of Eringen non-local model. The dielectric boundary plane is a thermal insulation surface and is subject to hydrostatic pressure. Regular mode method is used to determine the general solution of each physical quantity. From the numerical results, the effects of fractional order parameters, double temperature coefficients, non-local parameters and hydrostatic pressure on the transient magneto thermic elastic response of the structure are analyzed and discussed, and compared with other cases. The above results are expressed intuitively in graphic form, and it can be found that each parameter has certain influence on all field values. This result is of great significance to the application of different physics fields and provides some theoretical guidance for solving practical engineering.</p></div>","PeriodicalId":584,"journal":{"name":"Indian Journal of Physics","volume":"98 1","pages":"235 - 247"},"PeriodicalIF":1.6,"publicationDate":"2023-06-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"84091118","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
Magnetic and magnetocaloric properties of L-graphdiyne structure: Monte Carlo simulation L-graphdiyne 结构的磁性和磁致性：蒙特卡罗模拟
IF 1.6 4区 物理与天体物理
Indian Journal of Physics Pub Date : 2023-06-24 DOI: 10.1007/s12648-023-02798-6
A. Jabar, L. Bahmad, A. Benyoussef
{"title":"Magnetic and magnetocaloric properties of L-graphdiyne structure: Monte Carlo simulation","authors":"A. Jabar,&nbsp;L. Bahmad,&nbsp;A. Benyoussef","doi":"10.1007/s12648-023-02798-6","DOIUrl":"10.1007/s12648-023-02798-6","url":null,"abstract":"<div><p>In this work, using the Monte Carlo study, we illustrated the magnetic and magnetocaloric properties of the L-graphdiyne system with mixed 5/2 and 3/2 spins. We obtain magnetizations and magnetic susceptibilities of the system. The Neel temperature and the reduced compensation temperature are determined. The magnetic entropy changes of L-graphdiyne for several reduced external magnetic fields and the number L of hexagons are displayed. The relative cooling power has been calculated and discussed. Magnetic hysteresis cycles for different L = 1, 2, 3, and T = 2 demonstrate that the magnetization saturation increases with increasing L. In addition, the reduced magnetic coercive field increases with decreasing reduced exchange interaction r. Furthermore, the reduced magnetic coercive field increases with increasing values of the exchange coupling interactions p. In particular, super-paramagnetic behavior has been found for L = 1, due to the low values of the reduced magnetic coercive field.</p></div>","PeriodicalId":584,"journal":{"name":"Indian Journal of Physics","volume":"98 1","pages":"169 - 175"},"PeriodicalIF":1.6,"publicationDate":"2023-06-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"77468233","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
A geometrical ghost field and its cosmological implications 几何幽灵场及其宇宙学意义
IF 1.6 4区 物理与天体物理
Indian Journal of Physics Pub Date : 2023-06-24 DOI: 10.1007/s12648-023-02804-x
Hoavo Hova, Ferdinand Mavoa, Ines G. Salako
{"title":"A geometrical ghost field and its cosmological implications","authors":"Hoavo Hova,&nbsp;Ferdinand Mavoa,&nbsp;Ines G. Salako","doi":"10.1007/s12648-023-02804-x","DOIUrl":"10.1007/s12648-023-02804-x","url":null,"abstract":"<div><p>This paper studies the cosmic evolution in an extended theory of gravity obtained geometrically by transforming the normal-gauge Lyra displacement vector field <span>(phi _{mu })</span> as a vectorial function depending on a dynamical scalar field <span>(varphi)</span> with negative kinetic energy. By using the latest observational data, it is revealed that for <span>(omega ^{0} = -0.98)</span> the geometric fluid starts behaving as dark energy at the critical scale factor <span>(a_{de}=0.196844)</span> corresponding to a redshift <span>(z_{de}= 4.080165)</span> while the universe starts accelerating at the critical scale factor <span>(a_{ac} = 0.625436)</span> corresponding to a redshift of <span>(z_{ac}= 0.598885)</span>, and the age of the universe is <span>(t_{0}= 13.6423)</span> Gyr.</p></div>","PeriodicalId":584,"journal":{"name":"Indian Journal of Physics","volume":"98 1","pages":"391 - 396"},"PeriodicalIF":1.6,"publicationDate":"2023-06-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"79077548","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
Gammaless gamma-ray bursts? 无伽马射线暴？
IF 1.6 4区 物理与天体物理
Indian Journal of Physics Pub Date : 2023-06-23 DOI: 10.1007/s12648-023-02814-9
Kenath Arun, C. Sivaram
{"title":"Gammaless gamma-ray bursts?","authors":"Kenath Arun,&nbsp;C. Sivaram","doi":"10.1007/s12648-023-02814-9","DOIUrl":"10.1007/s12648-023-02814-9","url":null,"abstract":"<div><p>One of the possible resolutions of the compactness problem in gamma-ray bursts (GRBs) is by invoking the Lorentz factors associated with the relativistic bulk motion. This model applies to GRBs where sufficient energy is converted to accelerate the ejected matter to relativistic speeds. In some situations, this may not be a possible mechanism, and as a result, the gamma rays are trapped in the region. In this work, we look at such possible scenarios and where the neutrino pair production process can dominate. As a result, the neutrinos can escape freely. This could give rise to a scenario where the release of neutrinos precedes the gamma-ray emission that is much attenuated. This model can thus possibly explain why fewer GRBs are observed than what is expected.</p></div>","PeriodicalId":584,"journal":{"name":"Indian Journal of Physics","volume":"98 2","pages":"407 - 410"},"PeriodicalIF":1.6,"publicationDate":"2023-06-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"89630671","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 lithium bromide doping on structural, dielectric, and transport properties of methylcellulose-based solid polymer electrolyte films 掺杂溴化锂对甲基纤维素基固体聚合物电解质薄膜的结构、介电和传输特性的影响
IF 1.6 4区 物理与天体物理
Indian Journal of Physics Pub Date : 2023-06-23 DOI: 10.1007/s12648-023-02793-x
Shreedatta Hegde, V. Ravindrachary,  Ismayil, B. Guruswamy, Rohan N. Sagar, Ganesh Sanjeev
{"title":"Effect of lithium bromide doping on structural, dielectric, and transport properties of methylcellulose-based solid polymer electrolyte films","authors":"Shreedatta Hegde,&nbsp;V. Ravindrachary,&nbsp; Ismayil,&nbsp;B. Guruswamy,&nbsp;Rohan N. Sagar,&nbsp;Ganesh Sanjeev","doi":"10.1007/s12648-023-02793-x","DOIUrl":"10.1007/s12648-023-02793-x","url":null,"abstract":"<div><p>The study focuses on the preparation and characterization of solid polymer electrolyte films using methylcellulose (MC) and lithium bromide (LiBr) at various concentrations (5–25wt%). The films were prepared by the solution casting method, and their microstructural, thermal, dielectric, and transport properties were analyzed. Fourier transform infrared and X-ray diffraction results confirmed the complexation between the dopant and polymer and showed an increase in the amorphous phase of the polymer with doping. Thermogravimetric analysis showed an increase in the thermal stability of the polymer. Dielectric studies revealed that the dielectric parameters exhibited non-Debye behavior similar to polar dielectric materials. The highest ionic conductivity of 6.04 × 10<sup>–3</sup> S/cm was observed for the 25wt% LiBr-doped electrolyte at room temperature. The study also determined the ion transport number in the 25wt% doped electrolyte and carried out a transient ionic current study to confirm the contribution of the number of ionic species to major conduction within the electrolyte. Overall, the study highlights the potential of MC–LiBr solid polymer electrolytes for use in electrochemical devices.\u0000</p></div>","PeriodicalId":584,"journal":{"name":"Indian Journal of Physics","volume":"98 1","pages":"139 - 155"},"PeriodicalIF":1.6,"publicationDate":"2023-06-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"82756693","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
Isgur–Wise function for the semileptonic decay of (Lambda _b) baryon 重子半轻子衰变的 Isgur-Wise 函数
IF 1.6 4区 物理与天体物理
Indian Journal of Physics Pub Date : 2023-06-22 DOI: 10.1007/s12648-023-02809-6
Kaushal Thakkar
{"title":"Isgur–Wise function for the semileptonic decay of (Lambda _b) baryon","authors":"Kaushal Thakkar","doi":"10.1007/s12648-023-02809-6","DOIUrl":"10.1007/s12648-023-02809-6","url":null,"abstract":"<div><p>The Isgur–Wise function for the semileptonic decay of <span>(Lambda _b)</span> baryon is studied in the framework of the Hypercentral Constituent Quark Model. The six-dimensional hyperradial Schrödinger equation is solved in the variational approach to get masses and wavefunctions of heavy baryons. The obtained Isgur–Wise function is compared with the other theoretical work. The slope (<span>(rho ^2)</span>) of the Isgur–Wise function is determined and it is found that the computed slope (<span>(rho ^2)</span>) of the Isgur–Wise function is in accordance with other theoretical predictions and with the available experimental observations.</p></div>","PeriodicalId":584,"journal":{"name":"Indian Journal of Physics","volume":"98 1","pages":"365 - 369"},"PeriodicalIF":1.6,"publicationDate":"2023-06-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"74074225","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
Elliptical photonic crystal fiber sensor for multi-function detection based on surface plasmon resonance 基于表面等离子体共振的用于多功能检测的椭圆光子晶体光纤传感器
IF 1.6 4区 物理与天体物理
Indian Journal of Physics Pub Date : 2023-06-20 DOI: 10.1007/s12648-023-02791-z
Zhenhua Du, Huilong Liu
{"title":"Elliptical photonic crystal fiber sensor for multi-function detection based on surface plasmon resonance","authors":"Zhenhua Du,&nbsp;Huilong Liu","doi":"10.1007/s12648-023-02791-z","DOIUrl":"10.1007/s12648-023-02791-z","url":null,"abstract":"<div><p>In the paper, we propose an elliptical photonic crystal fiber sensor with an open ring channel, which could enhance the sensor performance. Gold is employed as the plasmonic material and coated on open ring channel. Using the finite element method, the wavelength sensitivity, the amplitude sensitivity, and the optical spectrum leakage from the fiber core to the sample channels are examined, and the influence of structural parameters on the sensor performance is investigated. The numerical results show that the proposed sensor exhibits a wide detection range of the refractive index (RI) from 1.20 to 1.40, the maximum wavelength sensitivity is 21,000 nm/RIU, where RIU is the RI unit, and the maximum amplitude sensitivity of 455.45 RIU<sup>−1</sup> is obtained for RI of 1.33. Moreover, the feasibility of the multi-function detection to identify fluorine-containing organics, glucose concentration, and pathogens in water is also numerically investigated.</p></div>","PeriodicalId":584,"journal":{"name":"Indian Journal of Physics","volume":"98 1","pages":"349 - 356"},"PeriodicalIF":1.6,"publicationDate":"2023-06-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"76319867","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
Recurrent neural networks with finite-time terminal sliding mode control for the fractional-order chaotic system with Gaussian noise 针对具有高斯噪声的分数阶混沌系统的具有有限时间终端滑模控制功能的递归神经网络
IF 1.6 4区 物理与天体物理
Indian Journal of Physics Pub Date : 2023-06-20 DOI: 10.1007/s12648-023-02778-w
Zengyue Zhan, Xiaoshan Zhao, Ruilong Yang
{"title":"Recurrent neural networks with finite-time terminal sliding mode control for the fractional-order chaotic system with Gaussian noise","authors":"Zengyue Zhan,&nbsp;Xiaoshan Zhao,&nbsp;Ruilong Yang","doi":"10.1007/s12648-023-02778-w","DOIUrl":"10.1007/s12648-023-02778-w","url":null,"abstract":"<div><p>A new finite-time terminal sliding mode control (TSMC) based on recurrent neural networks (RNN) is proposed aiming at fractional-order chaotic systems containing Gaussian white noise. At the same time, there are more accurate detection targets. Firstly, we can make tracking errors of state variables converge to zero quickly in finite time. Then the scheme is applied to the fractional-order PMSM system, and the effectiveness of the control scheme is verified by numerical simulation. Based on the above two points, the latter has more influence.</p></div>","PeriodicalId":584,"journal":{"name":"Indian Journal of Physics","volume":"98 1","pages":"291 - 300"},"PeriodicalIF":1.6,"publicationDate":"2023-06-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"74221294","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
Aubry–André–Harper model: multifractality analysis versus Landauer conductance for quasicrystal chains 奥布里-安德烈-哈珀模型：准晶体链的多折变性分析与朗道尔电导率比较
IF 1.6 4区 物理与天体物理
Indian Journal of Physics Pub Date : 2023-06-20 DOI: 10.1007/s12648-023-02810-z
Tuncer Kaya
{"title":"Aubry–André–Harper model: multifractality analysis versus Landauer conductance for quasicrystal chains","authors":"Tuncer Kaya","doi":"10.1007/s12648-023-02810-z","DOIUrl":"10.1007/s12648-023-02810-z","url":null,"abstract":"<div><p>We present the result of the localization feature of the quasiperiodic Aubry–André model. Localization and delocalization of energy eigenstates of the system are investigated by taking into account well-known theoretical perspectives such as the fractal dimension and the Landauer formula. Energy spectra of the system are obtained in the form of a Hofstadter butterfly for different values of the incommensurate parameter of the Aubry–André model and different values of the quasiperiodic disordered potentials. The inverse participation ratio analysis and fractal analysis of conductance are used for describing the localization feature of energy eigenstates. The conductance of the eigenstates is also obtained by calculating the transmission eigenvalues in the Landauer picture.</p></div>","PeriodicalId":584,"journal":{"name":"Indian Journal of Physics","volume":"98 2","pages":"489 - 496"},"PeriodicalIF":1.6,"publicationDate":"2023-06-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"83311874","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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