Pramana最新文献 - Book学术

On heat transfer with unsteady MHD nanofluid von Karman flow with uniform suction 非定常MHD纳米流体均匀吸力冯·卡门流的传热研究

IF 2.8 4区物理与天体物理

Pramana Pub Date : 2023-09-08 DOI: 10.1007/s12043-023-02618-w

Muhammad Rahman, Mustafa Turkyilmazoglu, Muhammad Bilal, FARHAT SHARIF

{"title":"On heat transfer with unsteady MHD nanofluid von Karman flow with uniform suction","authors":"Muhammad Rahman, Mustafa Turkyilmazoglu, Muhammad Bilal, FARHAT SHARIF","doi":"10.1007/s12043-023-02618-w","DOIUrl":"10.1007/s12043-023-02618-w","url":null,"abstract":"<div><p>The current paper focusses on the heat transfer characteristics in nanofluid MHD flow across a decelerated rotating disk with uniform suction. It is concerned with conventional von Karman flow pumping, but unlike a typical Newtonian fluid, it uses water-based nanofluids made up of TiO<span>(_2)</span>, Al<span>(_2)</span>O<span>(_3)</span>, Ag, CuO and Cu nanoparticles. The thermal energy equation was added to the classic von Karman flow problem in three dimensions. After employing the similarity transformations used by Watson and Wang, the leading equations transformed into a set of ordinary differential equations were numerically solved by using bvp4c MATLAB solver. Graphs were used to evaluate the behavioural study of heat transfer for various parameters. Furthermore, it can be stated that for a smaller Prandtl number <i>Pr</i>, the heat transfer rate is highest for all types of naofluids. The rate of heat transmission reduces as suction parameter <i>A</i> increases. The local Nusselt numbers are calculated and analysed and the path to enhance heat transfer is also proposed.\u0000</p></div>","PeriodicalId":743,"journal":{"name":"Pramana","volume":"97 4","pages":""},"PeriodicalIF":2.8,"publicationDate":"2023-09-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1007/s12043-023-02618-w.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"6551733","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: 1

Controllable shaping of CV–DV entanglement between CV states of certain parity and delocalized photon 具有一定宇称的CV态与离域光子之间的CV - dv纠缠的可控整形

IF 2.8 4区物理与天体物理

Pramana Pub Date : 2023-09-08 DOI: 10.1007/s12043-023-02622-0

Dmitry A Kuts, Nguyen Ba An, Sergey A Podoshvedov

引用次数: 0

Modulational instability, optical solitons and travelling wave solutions to two nonlinear models in birefringent fibres with and without four-wave mixing terms 调制不稳定性，光孤子和两种非线性模型的行波解在双折射光纤有和没有四波混频项

IF 2.8 4区物理与天体物理

Pramana Pub Date : 2023-07-20 DOI: 10.1007/s12043-023-02572-7

Shoukry El-Ganaini, Wen-Xiu Ma, Hitender Kumar

{"title":"Modulational instability, optical solitons and travelling wave solutions to two nonlinear models in birefringent fibres with and without four-wave mixing terms","authors":"Shoukry El-Ganaini, Wen-Xiu Ma, Hitender Kumar","doi":"10.1007/s12043-023-02572-7","DOIUrl":"10.1007/s12043-023-02572-7","url":null,"abstract":"<div><p>The paper aims to construct optical solitons and travelling wave solutions to two birefringent nonlinear models which consist of two-component form of vector solitons in optical fibre: the Biswas–Arshed model with Kerr-type nonlinearity and without four-wave mixing terms and the nonlinear Schrödinger equation with quadratic-cubic law of refractive index along with four-wave mixing terms. These nonlinear Schrödinger equations are applied in many physical and engineering fields. Optical solitons are considered in the context of photonic crystal fibres, couplers, polarisation-preserving fibres, metamaterials, birefringent fibres, and so on. Two reliable integration architectures, namely, the extended simplest equation method and the generalised sub-ODE approach, are adopted. As a result, bright soliton, kink and dark soliton, singular soliton, hyperbolic wave, a periodic wave, elliptic function solutions of Weierstrass and Jacobian types, and other travelling wave solutions, such as breather solutions and optical rogons, are derived, together with the existence conditions. In addition, the amplitude and intensity diagrams are portrayed by taking appropriate values for a few selected solutions. Furthermore, based on linear stability analysis, the modulation instability was explored for the obtained steady-state solutions. The reported results of this paper can enrich the dynamical behaviours of the two considered nonlinear models and can be useful in many scientific fields, such as mathematical physics, mathematical biology, telecommunications, engineering and optical fibres. This study confirms that the proposed approaches are sufficiently effective in extracting a variety of analytical solutions to other nonlinear models in both engineering and science.</p></div>","PeriodicalId":743,"journal":{"name":"Pramana","volume":"97 3","pages":""},"PeriodicalIF":2.8,"publicationDate":"2023-07-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"4797343","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: 1

A new structure of stochastic solutions to the NLSE in unstable dispersive environments via Rayleigh distribution 基于瑞利分布的不稳定色散环境下NLSE随机解的新结构

IF 2.8 4区物理与天体物理

Pramana Pub Date : 2023-07-19 DOI: 10.1007/s12043-023-02591-4

Mahmoud A E Abdelrahman, M A Sohaly, Yousef F Alharbi

引用次数: 0

Resummation-based quantum Monte Carlo vis-à-vis sign-problematic (S=frac{1}{2}) Heisenberg models on canonical geometrically frustrated lattices 基于简历的量子蒙特卡罗与-à-vis符号问题(S=frac{1}{2})经典几何受挫格上的海森堡模型

IF 2.8 4区物理与天体物理

Pramana Pub Date : 2023-07-19 DOI: 10.1007/s12043-023-02586-1

Nisheeta Desai, Sumiran Pujari

引用次数: 0

Viable decoupled solutions in energy–momentum squared gravity 能量动量平方重力的可行解

IF 2.8 4区物理与天体物理

Pramana Pub Date : 2023-07-18 DOI: 10.1007/s12043-023-02595-0

M Sharif, Saba Naz

{"title":"Viable decoupled solutions in energy–momentum squared gravity","authors":"M Sharif, Saba Naz","doi":"10.1007/s12043-023-02595-0","DOIUrl":"10.1007/s12043-023-02595-0","url":null,"abstract":"<div><p>The aim of this study is to discuss viable anisotropic solutions of self-gravitating system through a minimal geometric deformation approach in the perspective of <span>(f(R, T^{2}))</span> gravity. In this regard, we assume two sources (seed and additional) for the static sphere. The seed source is considered to be isotropic, while the additional source induces anisotropy. The field equations are decoupled into two sets by deforming the radial metric function. The metric potentials of the Krori–Barua solution are employed to obtain exact solution of the field equations while three different constraints are used to find the solutions corresponding to the anisotropic source. Junction conditions are utilised to determine the values of unknown constants at the hypersurface. Finally, we check the viability and stability of the obtained solutions using the star candidate PSR J1614-2230. We show that all the three solutions satisfy the viability conditions. It is found that solution I is stable using both Herrara’s cracking as well as squared sound speed approach while solutions II and III are stable using only Herrara’s cracking approach.</p></div>","PeriodicalId":743,"journal":{"name":"Pramana","volume":"97 3","pages":""},"PeriodicalIF":2.8,"publicationDate":"2023-07-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1007/s12043-023-02595-0.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"4721661","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

Complex bursting oscillations induced by pulse-shaped explosion and integer frequency ratios in a Rayleigh–van der Pol system Rayleigh-van - der - Pol系统中脉冲型爆炸和整数频率比引起的复杂爆破振荡

IF 2.8 4区物理与天体物理

Pramana Pub Date : 2023-07-17 DOI: 10.1007/s12043-023-02566-5

Zhangyao Chen, Xindong Ma, Qinsheng Bi

{"title":"Complex bursting oscillations induced by pulse-shaped explosion and integer frequency ratios in a Rayleigh–van der Pol system","authors":"Zhangyao Chen, Xindong Ma, Qinsheng Bi","doi":"10.1007/s12043-023-02566-5","DOIUrl":"10.1007/s12043-023-02566-5","url":null,"abstract":"<div><p>The pulse-shaped explosion (abbreviated as PSE) behavior, represented as the system roots pulse-shaped quantitative changing sharply, is a new way to the bursting oscillations proposed recently. In the present paper, the complex bursting oscillation patterns triggered by the PSE and integer frequency ratios are considered based on a Rayleigh–van der Pol system (abbreviated as RVDPS) excited by the parametrical and external forces. Two cascade bursting oscillations, the cascade supHopf/supHopf bursting oscillations induced by the integer frequency ratios and the cascade supHopf/supHopf bursting oscillations with multiple PSE/PSE hysteresis loops induced by the integer frequency ratios and PSEs, are investigated. We show that the PSEs occur when the system solution curve approaches to infinity at some certain values and the PSEs do not change the stabilities of the attractors. In addition, we find that the frequency and period of the cascade bursting oscillation patterns equal to that of the external force. Our study proposes a new PSE type to the bursting oscillations named the cascade PSEs and increases two cascade bursting oscillation patterns.</p></div>","PeriodicalId":743,"journal":{"name":"Pramana","volume":"97 3","pages":""},"PeriodicalIF":2.8,"publicationDate":"2023-07-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"4685958","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

Periodic solutions of the modified short pulse equation 修正短脉冲方程的周期解

IF 2.8 4区物理与天体物理

Pramana Pub Date : 2023-07-17 DOI: 10.1007/s12043-023-02580-7

Min Xue, Zhigang Li, Yuchen Zhu

引用次数: 0

Effects of nuclear side reactions on fusion triple product and saddle point condition in the spherical torus 核副反应对聚变三积和球面环面鞍点条件的影响

IF 2.8 4区物理与天体物理

Pramana Pub Date : 2023-07-17 DOI: 10.1007/s12043-023-02585-2

L Rajablou, S M Motevalli, F Fadaei

引用次数: 0

Design, fabrication and characterization of terahertz five-band metamaterial absorber 太赫兹五波段超材料吸收体的设计、制造与表征

IF 2.8 4区物理与天体物理

Pramana Pub Date : 2023-07-14 DOI: 10.1007/s12043-023-02583-4

A Elakkiya, Srigitha S Nath, M Vanitha

引用次数: 0