IF 1.9 4区物理与天体物理

Pramana Pub Date : 2024-08-01 DOI: 10.1007/s12043-024-02805-3

Vishal Chandel, Sunil

{"title":"Influence of magnetic fields and bounding surface configurations on thermal convection in partially ionised plasmas: nonlinear and linear stability analyses","authors":"Vishal Chandel,  Sunil","doi":"10.1007/s12043-024-02805-3","DOIUrl":"10.1007/s12043-024-02805-3","url":null,"abstract":"<div>This study investigates the influence of a magnetic field on thermal convection within a PIP confined between distinct combinations of bounding surfaces. Nonlinear stability analysis (employing the energy method) and linear instability analysis (utilising the normal mode analysis method) are conducted and eigenvalue problems are formulated for both analyses. Numerical analysis is executed using the Galerkin-weighted residual method. Additionally, the study examines the effects of magnetic field, collisional frequency and compressibility on the onset of thermal convection. Collisional frequency plays a significant role in the decay of energy. The principle of exchange of stability is validated for linear analysis, indicating the absence of oscillatory modes of convection. The findings show that the Rayleigh number for both nonlinear and linear analyses is the same. Hence, the subcritical region is not possible, which affirms the existence of global stability. It is noteworthy that both magnetic field and compressibility contribute to the delay in the onset of thermal convection. Also, the PIP confined in rigid–rigid bounding surfaces is thermally more stable than the other configurations of the bounding surfaces.</div>","PeriodicalId":743,"journal":{"name":"Pramana","volume":"98 3","pages":""},"PeriodicalIF":1.9,"publicationDate":"2024-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141866014","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 superthermal-trapped ((kappa -beta )) electrons on the modulational instability of ion-acoustic waves 超热俘获 ( $$kappa -beta $$ ) 电子对离子声波调制不稳定性的影响

IF 1.9 4区物理与天体物理

Pramana Pub Date : 2024-08-01 DOI: 10.1007/s12043-024-02803-5

Parveen Bala, Gurmant Kaur

{"title":"Effect of superthermal-trapped ((kappa -beta )) electrons on the modulational instability of ion-acoustic waves","authors":"Parveen Bala, Gurmant Kaur","doi":"10.1007/s12043-024-02803-5","DOIUrl":"10.1007/s12043-024-02803-5","url":null,"abstract":"<div>This research work focusses on examining the attributes of ion-acoustic waves (IA waves) in a plasma environment embodying superthermal-trapped electron distributions, characterised by the parameters (kappa ) and (beta ) representing superthermality and trapping respectively. The study utilises a modified nonlinear Schrödinger equation (m-NLSE) derived using the reductive perturbation method (RPM) to model the dynamics of modulated wave packets in this plasma framework. The study investigates the impact of superthermality ((kappa )) and trapping ((beta )) parameters on the envelopes of IA waves. The research explores the conditions for modulational instability (MI) of IA waves, characterised by the dispersion-nonlinearity product PQ in the m-NLSE. Bright and dark solitons are observed corresponding to different signs of PQ, i.e., (PQ<0) and (PQ>0) indicating the presence of modulationally unstable and stable regimes, respectively. The cutoff wavenumber (k_{c}) at which MI enters increases with decreasing superthermality (increasing (kappa )). Interestingly, (k_{c}) is observed to be independent of the trapping parameter ((beta )), suggesting that electron trapping does not significantly influence the onset of MI. Further, the effects of (kappa ) and (beta ) on the maximum growth rate ((Gamma _{textrm{max}})) and the modulational wavenumber ((K_{textrm{max}})) associated with MI are also investigated.</div>","PeriodicalId":743,"journal":{"name":"Pramana","volume":"98 3","pages":""},"PeriodicalIF":1.9,"publicationDate":"2024-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141866015","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

Efficiency of the new B3Y-fetal potential in the analysis of the elastic and inelastic angular distributions for the ({}^{10})B+(^{12})C system 新的 B3Y 胎势在分析 $${}^{10}$ B+ $$^{12}$ C 系统的弹性和非弹性角分布中的效率

IF 1.9 4区物理与天体物理

Pramana Pub Date : 2024-07-29 DOI: 10.1007/s12043-024-02760-z

N Amangeldi, N Burtebayev, S V Artemov, Maulen Nassurlla, B Mauyey, G Yergaliuly, Marzhan Nassurlla, F Kh Ergashev, D Soldatkhan, D S Shaudirbayeva, Awad A Ibraheem, Sh Hamada

{"title":"Efficiency of the new B3Y-fetal potential in the analysis of the elastic and inelastic angular distributions for the ({}^{10})B+(^{12})C system","authors":"N Amangeldi, N Burtebayev, S V Artemov, Maulen Nassurlla, B Mauyey, G Yergaliuly, Marzhan Nassurlla, F Kh Ergashev, D Soldatkhan, D S Shaudirbayeva, Awad A Ibraheem, Sh Hamada","doi":"10.1007/s12043-024-02760-z","DOIUrl":"10.1007/s12043-024-02760-z","url":null,"abstract":"<div>In our previous work Burtebayev et al, Int J Mod Phys E 28, 1950028 (2019), we presented the angular distribution (AD) for ({}^{10})B ions elastically scattered from the ({}^{12})C target at (E_{text {lab}}({}^{10}text {B})=) 41.3 MeV. The measured data exhibited a pronounced increase in cross-sections at backward angles. This is mostly attributed to the effect of deuteron transfer between the colliding nuclei. In this work, we present the inelastic ADs for the same system leading to the (J^{pi } = 2^{+}, E_{x}=) 4.439 MeV and (J^{pi } = 3^{-}, E_{x} =) 9.641 MeV excited states of the ({}^{12})C nucleus. The measured inelastic ({}^{12})C(({}^{10})B, ({}^{10})B)({}^{12})C(^{*}) ADs, together with the previously measured elastic ({}^{12})C(({}^{10})B,({}^{10})B)({}^{12})C ADs at (E_{text {lab}}({}^{10}text {B})=) 17.5, 18, 41.3 and 100 MeV, are analysed within the methods of distorted wave Born approximation (DWBA) and coupled reaction channels (CRC) using the new B3Y and the standard M3Y effective interaction potentials. Spectroscopic amplitude (SA) values were determined for the ({}^{12}text {C}rightarrow {}^{10}text {B} + d) configuration.\u0000</div>","PeriodicalId":743,"journal":{"name":"Pramana","volume":"98 3","pages":""},"PeriodicalIF":1.9,"publicationDate":"2024-07-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141866217","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

Diversified role of linear radiative stretching/shrinking sheet in the time-dependent hybrid nanofluid flow containing carbon nanotubes nanoparticles 线性辐射拉伸/收缩片在含有纳米碳管的随时间变化的混合纳米流体流动中的多样化作用

IF 1.9 4区物理与天体物理

Pramana Pub Date : 2024-07-27 DOI: 10.1007/s12043-024-02797-0

Surender Ontela, S R Mishra, P K Pattnaik, Subhajit Panda

{"title":"Diversified role of linear radiative stretching/shrinking sheet in the time-dependent hybrid nanofluid flow containing carbon nanotubes nanoparticles","authors":"Surender Ontela, S R Mishra, P K Pattnaik, Subhajit Panda","doi":"10.1007/s12043-024-02797-0","DOIUrl":"10.1007/s12043-024-02797-0","url":null,"abstract":"<div>In medical applications, carbon nanotubes (CNTs) are used as adaptable drug carriers for targeted delivery, utilising their ability to exactly encapsulate and release therapeutic compounds, and as contrast agents in cutting-edge imaging modalities like MRI and CT scans. The current investigation deals with the unsteady flow of hybrid nanofluid via an expanding/contracting surface. The flow of hybrid nanofluid for the conjunction of magnetisation, radiating heat and additional heat source energies the flow properties. The role of suction/injection is vital for the flow through the permeable medium. The hybrid nanofluid is a composite of single-wall carbon nanotube (SWCNT) and multi-wall carbon nanotube (MWCNT) nanoparticles in the base liquid water. Appropriate similarity transformation converts the governing PDEs to nonlinear ODEs. Further, these are handled numerically retaining shooting-based Runge–Kutta fourth-order technique. The physical consequence of various constraints affecting the flow are explained using graphs and numerical outcomes relating to rate coefficients are shown via tabular form.</div>","PeriodicalId":743,"journal":{"name":"Pramana","volume":"98 3","pages":""},"PeriodicalIF":1.9,"publicationDate":"2024-07-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141783435","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

Effective thermal properties under the influence of various shapes of the nanoparticles on the flow of ternary hybrid nanofluid over an infinite vertical plate 各种形状的纳米颗粒对三元混合纳米流体在无限垂直板上流动的影响下的有效热特性

IF 1.9 4区物理与天体物理

Pramana Pub Date : 2024-07-23 DOI: 10.1007/s12043-024-02792-5

P K Pattnaik, Rupa Baithalu, S R Mishra, Subhajit Panda

{"title":"Effective thermal properties under the influence of various shapes of the nanoparticles on the flow of ternary hybrid nanofluid over an infinite vertical plate","authors":"P K Pattnaik, Rupa Baithalu, S R Mishra, Subhajit Panda","doi":"10.1007/s12043-024-02792-5","DOIUrl":"10.1007/s12043-024-02792-5","url":null,"abstract":"<div>The influence of various thermal properties of nanoparticles in several applications in industries, engineering, biomedical, etc. has gained the interest of researchers drastically. The current investigation aims in presenting the performance of various thermophysical properties, such as viscosity, conductivity, specific heat, etc. under the influence of various shapes of the nanoparticles on the flow of ternary hybrid nanofluid over an infinite vertical plate embedding within a permeable medium. The conducting fluid under an applied magnetic field with thermal radiation enriches the flow properties. Suitable similarity rules combined with similarity variables and stream function are adopted to transform the governing phenomena into a non-dimensional form. Further, analytical approaches, such as Laplace transformation technique is embraced for solving this unsteady system of equations. The graphs and tables present the physical behaviour of the contributing factors with a correlative result. The physical behaviour of these factors is described briefly and important outcomes are also depicted as a conclusive remark. It is observed that the enhanced magnetisation and heavier density of the ternary hybrid nanofluid decelerate the velocity distribution significantly whereas the cooling of the surface due to thermal Grashof number augments the fluid velocity. Further, the higher conductivity of the ternary nanofluid along with increasing thermal radiation increases the fluid temperature.</div>","PeriodicalId":743,"journal":{"name":"Pramana","volume":"98 3","pages":""},"PeriodicalIF":1.9,"publicationDate":"2024-07-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141783436","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

The experimental internal bremsstrahlung spectrum of ({}^{14})C isotope {}^{14}$$碳同位素的内轫致辐射实验光谱

IF 1.9 4区物理与天体物理

Pramana Pub Date : 2024-07-23 DOI: 10.1007/s12043-024-02801-7

Ekrem Almaz, Cüneyt Çelıktaş, Hasan Ali Aygör, Turgut Saritaş

引用次数: 0

Investigation of high spin properties of (^{55})Cr in deformed Hartree–Fock and angular momentum projection model 在变形哈特里-福克和角动量投影模型中研究 $$^{55}$$ Cr 的高自旋特性

IF 1.9 4区物理与天体物理

Pramana Pub Date : 2024-07-17 DOI: 10.1007/s12043-024-02739-w

Nandita Kar, Zashmir Naik

引用次数: 0

Dynamic analysis of a novel SI network rumour propagation model with self-regulatory mechanism 具有自我调节机制的新型 SI 网络谣言传播模型的动态分析