Chinese Journal of Physics最新文献

{"title":"Probing the magnitude and orientation of the effective nuclear magnetic field in a single quantum dot using finite-frequency shot noise","authors":"Hai-Bin Xue,&nbsp;Hai-Yan Jing","doi":"10.1016/j.cjph.2025.05.009","DOIUrl":"10.1016/j.cjph.2025.05.009","url":null,"abstract":"<div><div>In the III–V quantum dot (QD) systems, e.g., GaAs, InP, and InAs, the nuclear spins of their lattice atoms are nonzero, and the hyperfine interaction between these nuclear spins and the localized electron spins is the dominant mechanism of electron spin relaxation at low temperatures. Consequently, the quantitative extraction of information on the magnitude and orientation of the effective nuclear magnetic field in QD systems is important for a deeper understanding of their spin dynamics. In this work, the Fano factor of the finite-frequency shot noise of electron transport through a QD system with an effective nuclear magnetic field weakly coupled to the two ferromagnetic leads is investigated. It is numerically demonstrated that the position and the height of the peak of the Fano factor of the finite-frequency shot noise can be used to quantitatively extract the magnitude and orientation (polar angle) of the effective nuclear magnetic field, respectively. The predicted results therefore suggest an alternative way to quantitatively determine the magnitude and orientation of the effective nuclear magnetic field in a single QD system.</div></div>","PeriodicalId":10340,"journal":{"name":"Chinese Journal of Physics","volume":"96 ","pages":"Pages 309-319"},"PeriodicalIF":4.6,"publicationDate":"2025-05-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144168225","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"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}

{"title":"Nonlinear stability of thermosolutal convection in a Kelvin–Voigt fluid subject to a vertical magnetic field","authors":"Sangamesh ,&nbsp;K.R. Raghunatha ,&nbsp;Ali J. Chamkha","doi":"10.1016/j.cjph.2025.05.022","DOIUrl":"10.1016/j.cjph.2025.05.022","url":null,"abstract":"<div><div>The nonlinear stability of oscillatory thermosolutal convection in a horizontal layer of an electrically conducting Kelvin–Voigt fluid subject to an imposed vertical magnetic field is examined using a modified perturbation method. A cubic complex Landau equation is derived, enabling an exploration of the stability of the bifurcating solution and also quantification of heat and mass transfer. The study has explored the results of linear instability theory as well, where conditions for the onset of stationary and oscillatory convection are analytically determined. The viscoelastic properties of the fluid play a critical role, either delaying or hastening the onset of oscillatory convection depending on the strength of the solutal concentration. Several novel findings emerge under specific parametric conditions, including: (i) the identification of a disconnected closed convex oscillatory neutral curve, separate from the stationary curve, (ii) the destabilization of a stable electrically conducting Kelvin–Voigt fluid layer by a stable solutal concentration gradient in the existence of a magnetic field and (iii) the destabilization of a stable thermosolutal conducting Kelvin–Voigt fluid layer when subjected to a magnetic field. Additionally, the study establishes the option of occurring subcritical instability, and provides a detailed analysis of heat and mass transfer for various values of input parameters. These results are physically significant as they underscore the complex interactions between elasticity, diffusion, and magnetic effects in determining the stability of fluid system, which could have implications for various geophysical and industrial processes.</div></div>","PeriodicalId":10340,"journal":{"name":"Chinese Journal of Physics","volume":"96 ","pages":"Pages 377-398"},"PeriodicalIF":4.6,"publicationDate":"2025-05-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144185063","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"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}

{"title":"An exploration of geometric and curvature properties of Lemos black hole spacetime","authors":"Absos Ali Shaikh ,&nbsp;Faizuddin Ahmed ,&nbsp;Mousumi Sarkar ,&nbsp;Kamiruzzaman","doi":"10.1016/j.cjph.2025.05.011","DOIUrl":"10.1016/j.cjph.2025.05.011","url":null,"abstract":"&lt;div&gt;&lt;div&gt;This research delves into the curvature properties of the Lemos black hole (LBH) spacetime, a solution derived from the Einstein field equations incorporating a negative cosmological constant. By examining these unique geometric attributes, the study aims to enhance our understanding of LBH spacetime and its implications in relativity and cosmology. It reveals that this type of spacetime illustrates pseudosymmetry, Ricci pseudosymmetry, and encompasses various pseudosymmetric structures such as pseudosymmetry due to conharmonic curvature, projective curvature, concircular curvature, and conformal curvature. Additionally, it demonstrates Ricci semisymmetry, Ricci generalized conformal pseudosymmetry due to the projective curvature tensor, Ricci generalized projective pseudosymmetry, and Ricci generalized pseudosymmetry. Later findings indicate that the LBH spacetime qualifies as an Ein&lt;span&gt;&lt;math&gt;&lt;mrow&gt;&lt;mo&gt;(&lt;/mo&gt;&lt;mn&gt;2&lt;/mn&gt;&lt;mo&gt;)&lt;/mo&gt;&lt;/mrow&gt;&lt;/math&gt;&lt;/span&gt;. Moreover, the study establishes linear dependences between the tensors &lt;span&gt;&lt;math&gt;&lt;mrow&gt;&lt;mi&gt;Q&lt;/mi&gt;&lt;mrow&gt;&lt;mo&gt;(&lt;/mo&gt;&lt;mi&gt;g&lt;/mi&gt;&lt;mo&gt;,&lt;/mo&gt;&lt;mi&gt;R&lt;/mi&gt;&lt;mo&gt;)&lt;/mo&gt;&lt;/mrow&gt;&lt;/mrow&gt;&lt;/math&gt;&lt;/span&gt;, &lt;span&gt;&lt;math&gt;&lt;mrow&gt;&lt;mi&gt;Q&lt;/mi&gt;&lt;mrow&gt;&lt;mo&gt;(&lt;/mo&gt;&lt;mi&gt;S&lt;/mi&gt;&lt;mo&gt;,&lt;/mo&gt;&lt;mi&gt;R&lt;/mi&gt;&lt;mo&gt;)&lt;/mo&gt;&lt;/mrow&gt;&lt;/mrow&gt;&lt;/math&gt;&lt;/span&gt;, &lt;span&gt;&lt;math&gt;&lt;mrow&gt;&lt;mi&gt;Q&lt;/mi&gt;&lt;mrow&gt;&lt;mo&gt;(&lt;/mo&gt;&lt;mi&gt;g&lt;/mi&gt;&lt;mo&gt;,&lt;/mo&gt;&lt;mi&gt;C&lt;/mi&gt;&lt;mo&gt;)&lt;/mo&gt;&lt;/mrow&gt;&lt;/mrow&gt;&lt;/math&gt;&lt;/span&gt;, and &lt;span&gt;&lt;math&gt;&lt;mrow&gt;&lt;mi&gt;Q&lt;/mi&gt;&lt;mrow&gt;&lt;mo&gt;(&lt;/mo&gt;&lt;mi&gt;S&lt;/mi&gt;&lt;mo&gt;,&lt;/mo&gt;&lt;mi&gt;C&lt;/mi&gt;&lt;mo&gt;)&lt;/mo&gt;&lt;/mrow&gt;&lt;/mrow&gt;&lt;/math&gt;&lt;/span&gt; on the commutator &lt;span&gt;&lt;math&gt;&lt;mrow&gt;&lt;mo&gt;(&lt;/mo&gt;&lt;mi&gt;C&lt;/mi&gt;&lt;mi&gt;⋅&lt;/mi&gt;&lt;mi&gt;R&lt;/mi&gt;&lt;mo&gt;−&lt;/mo&gt;&lt;mi&gt;R&lt;/mi&gt;&lt;mi&gt;⋅&lt;/mi&gt;&lt;mi&gt;C&lt;/mi&gt;&lt;mo&gt;)&lt;/mo&gt;&lt;/mrow&gt;&lt;/math&gt;&lt;/span&gt;. It also identifies the significant relation &lt;span&gt;&lt;math&gt;&lt;mrow&gt;&lt;mi&gt;R&lt;/mi&gt;&lt;mi&gt;⋅&lt;/mi&gt;&lt;mi&gt;R&lt;/mi&gt;&lt;mo&gt;−&lt;/mo&gt;&lt;mi&gt;L&lt;/mi&gt;&lt;mi&gt;Q&lt;/mi&gt;&lt;mrow&gt;&lt;mo&gt;(&lt;/mo&gt;&lt;mi&gt;g&lt;/mi&gt;&lt;mo&gt;,&lt;/mo&gt;&lt;mi&gt;C&lt;/mi&gt;&lt;mo&gt;)&lt;/mo&gt;&lt;/mrow&gt;&lt;mo&gt;=&lt;/mo&gt;&lt;mi&gt;Q&lt;/mi&gt;&lt;mrow&gt;&lt;mo&gt;(&lt;/mo&gt;&lt;mi&gt;S&lt;/mi&gt;&lt;mo&gt;,&lt;/mo&gt;&lt;mi&gt;R&lt;/mi&gt;&lt;mo&gt;)&lt;/mo&gt;&lt;/mrow&gt;&lt;/mrow&gt;&lt;/math&gt;&lt;/span&gt;. It is also noteworthy to mention that LBH spacetime admits pseudosymmetric Weyl tensor &lt;span&gt;&lt;math&gt;&lt;mrow&gt;&lt;mo&gt;(&lt;/mo&gt;&lt;mi&gt;C&lt;/mi&gt;&lt;mi&gt;⋅&lt;/mi&gt;&lt;mi&gt;C&lt;/mi&gt;&lt;mo&gt;=&lt;/mo&gt;&lt;msub&gt;&lt;mrow&gt;&lt;mi&gt;L&lt;/mi&gt;&lt;/mrow&gt;&lt;mrow&gt;&lt;mi&gt;c&lt;/mi&gt;&lt;/mrow&gt;&lt;/msub&gt;&lt;mrow&gt;&lt;mo&gt;(&lt;/mo&gt;&lt;msub&gt;&lt;mrow&gt;&lt;mo&gt;∧&lt;/mo&gt;&lt;/mrow&gt;&lt;mrow&gt;&lt;mi&gt;g&lt;/mi&gt;&lt;/mrow&gt;&lt;/msub&gt;&lt;mi&gt;⋅&lt;/mi&gt;&lt;mi&gt;C&lt;/mi&gt;&lt;mo&gt;)&lt;/mo&gt;&lt;/mrow&gt;&lt;mo&gt;)&lt;/mo&gt;&lt;/mrow&gt;&lt;/math&gt;&lt;/span&gt; which is invariant under conformal transformation, and hence the curvature classification of such a spacetime is applicable to the conformal field theory (CFT). Furthermore, the Ricci tensor of the LBH spacetime exhibits properties consistent with cyclic parallelism as well as Codazzi-type condition. It is interesting to note that LBH spacetime is neither locally symmetric nor conformally symmetric but Ricci symmetric and hence Ricci semisymmetric. The study further highlights the novel discovery that the energy–momentum tensor of the LBH spacetime does not exhibit pseudosymmetry, but it reveals several pseudosymmetric type properties, such as Ricci generalized pseudosymmetry and it is","PeriodicalId":10340,"journal":{"name":"Chinese Journal of Physics","volume":"96 ","pages":"Pages 333-354"},"PeriodicalIF":4.6,"publicationDate":"2025-05-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144168223","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"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}

{"title":"Electron transport of zigzag (8,0) carbon nanotube doped with nitrogen atoms with respect to spacing and length","authors":"Yayu Deng ,&nbsp;Qingyi Shao","doi":"10.1016/j.cjph.2025.05.026","DOIUrl":"10.1016/j.cjph.2025.05.026","url":null,"abstract":"<div><div>Based on the non-equilibrium Green's function (NEGF) method in density functional theory (DFT), the electron transport of nitrogen-doped (8,0) carbon nanotubes with different lengths and doping spacings is studied. Doped nitrogen atoms break the spatial symmetry of the carbon nanotube. In the energy band, impurities ionize to generate new bands and reduce the band gap width. The reduced spacing enables atoms to ionize more electrons and increases electron mobility. Reducing the length of the nanotube within a certain range helps to decrease the probability of lattice scattering and enhances electron transport in the nanotube. Doping spacing and electron mobility show a negative correlation for nanotubes with the same length. The conductivity is influenced by the degree of electron scattering and the ionization-recombination processes of impurities. This demonstrates that by varying the nitrogen doping spacing and carbon nanotube length, it is possible to manipulate the electrical characteristics of single-walled carbon nanotubes (SWCNTs).</div></div>","PeriodicalId":10340,"journal":{"name":"Chinese Journal of Physics","volume":"96 ","pages":"Pages 412-424"},"PeriodicalIF":4.6,"publicationDate":"2025-05-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144195777","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"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}

{"title":"The (2+1)-dimensional time-fractional Kundu–Mukherjee–Naskar equation: Lie point symmetries, exact solutions and conservation laws","authors":"Tao Ling,&nbsp;Hui Wang,&nbsp;Yunhu Wang","doi":"10.1016/j.cjph.2025.05.004","DOIUrl":"10.1016/j.cjph.2025.05.004","url":null,"abstract":"<div><div>In this paper, the Lie point symmetry method is employed to investigate the (2+1)-dimensional time-fractional Kundu–Mukherjee–Naskar equation. Through the obtained Lie point symmetries, the studied fractional partial differential equation can be reduced to lower dimensional equations with Erdélyi–Kober fractional operators. Meanwhile, the reduced equations are solved using the power series method, followed by a detailed convergence analysis of the power series solutions. Furthermore, conservation laws for the time-fractional Kundu–Mukherjee–Naskar equation are derived through the conservation theorem and generalized Noether operators.</div></div>","PeriodicalId":10340,"journal":{"name":"Chinese Journal of Physics","volume":"96 ","pages":"Pages 700-715"},"PeriodicalIF":4.6,"publicationDate":"2025-05-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144312894","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"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}

{"title":"Effects of matter and non-metricity couplings on the structure of neutron stars","authors":"Bidisha Samanta ,&nbsp;Ksh. Newton Singh ,&nbsp;Abhisek Dutta ,&nbsp;Farook Rahaman","doi":"10.1016/j.cjph.2025.05.001","DOIUrl":"10.1016/j.cjph.2025.05.001","url":null,"abstract":"<div><div>This article investigates the stability of neutron stars in <span><math><mrow><mi>f</mi><mrow><mo>(</mo><mi>Q</mi><mo>,</mo><mi>T</mi><mo>)</mo></mrow></mrow></math></span>-gravity. We have taken a linear combination of the non-metricity and the trace of the energy–momentum tensor with coupling constants <span><math><mi>γ</mi></math></span> and <span><math><mi>η</mi></math></span>, respectively. The solution of the field equations has been explored using the vanishing complexity method. By tuning the values of these coupling constants, we have analysed the stability of neutron stars through the modified TOV equation, adiabatic index, and static stability criterion. To ensure the physical acceptability of the solution, we have plotted the <span><math><mrow><mi>M</mi><mo>−</mo><mi>R</mi></mrow></math></span> curves to fit the observed masses of a few neutron stars and estimate the radii in <span><math><mrow><mi>f</mi><mrow><mo>(</mo><mi>Q</mi><mo>,</mo><mi>T</mi><mo>)</mo></mrow></mrow></math></span>-gravity for different values of the two coupling constants.</div></div>","PeriodicalId":10340,"journal":{"name":"Chinese Journal of Physics","volume":"96 ","pages":"Pages 559-576"},"PeriodicalIF":4.6,"publicationDate":"2025-05-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144263449","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"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}

{"title":"Inspection of nonlinear EHD linked to swirling stability of an azimuthal circular interface","authors":"Asma Alanazy ,&nbsp;Galal M. Moatimid ,&nbsp;Aya Sayed","doi":"10.1016/j.cjph.2025.05.006","DOIUrl":"10.1016/j.cjph.2025.05.006","url":null,"abstract":"<div><div>Improving procedures such as oil recovery, biological flows, and materials processing necessitates comprehension of fluid interactions in both natural and industrial systems, encompassing viscoelasticity, Reiner-Rivlin fluid (RRF), and porous surfaces. The purpose of the current work is to analyze the stability of swirling fluids at an azimuthal circular interface that separates two RRF via porous media. The system is compressed using a consistent azimuthal electric field (EF). Examining the stability of Electrohydrodynamics (EHD) enables the prediction and regulation of instabilities, hence simplifying the development of effective control mechanisms. The two fluids are contained within two planar circular solid cylinders, where mass and heat transfer (MHT) happens. The mathematical method is justified through the application of viscous potential theory (VPT). The nonlinear partial differential equation (PDE) derived from this approach governs the displacement of the interface. The nonlinear instability is achieved through the application of the non-perturbative approach (NPA). The primary objective of the NPA is to convert the nonlinear ODE into a linear one. This unique viewpoint is established by formulating the He's frequency formula (HFF) to describe the displacement of the contact. The approach illustrates that the impacts of numerous non-dimensional physical characteristics remain invariant. The primary findings indicate that both the swirling angular velocity ratio and the Weber number have a destabilizing effect on stability. The results established that the HMT parameters, viscosity ratio, and Ohnesorge number exert a dual influence on the stability profile. Conversely, Darcy's numerical values, dielectric ratio, and density ratio exert stabilizing effects. The removal of the Weber number results in the elimination of all imaginary components from the characteristic equation, as demonstrated in a specific instance.</div></div>","PeriodicalId":10340,"journal":{"name":"Chinese Journal of Physics","volume":"96 ","pages":"Pages 792-825"},"PeriodicalIF":4.6,"publicationDate":"2025-05-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144364478","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"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}

{"title":"Gauge Symmetry of Free Dirac Fermions","authors":"S.-C. Lee,&nbsp;Y.W. Chang","doi":"10.1016/j.cjph.2025.05.016","DOIUrl":"10.1016/j.cjph.2025.05.016","url":null,"abstract":"<div><div>We show that the Lagrangian for free Dirac fermions can be written in a form which is invariant under gauge translation symmetry. The Lagrangian can be extended to have gauge <span><math><mrow><mi>S</mi><mi>U</mi><mo>(</mo><mrow><mn>2</mn><mo>,</mo><mn>2</mn></mrow><mo>)</mo></mrow></math></span> symmetry, leading to a modified Dirac equation. The close connection between translation symmetry in spinor space and <span><math><mrow><mi>G</mi><mi>L</mi><mo>(</mo><mrow><mn>4</mn><mi>R</mi></mrow><mo>)</mo></mrow></math></span> symmetry of spacetime manifold is illustrated.</div></div>","PeriodicalId":10340,"journal":{"name":"Chinese Journal of Physics","volume":"96 ","pages":"Pages 304-308"},"PeriodicalIF":4.6,"publicationDate":"2025-05-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144147828","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"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}

{"title":"Utilizing low-temperature GaN insertion in p+-GaN and n++-GaN layers as connection layers in GaN-based tandem LEDs","authors":"Wei-Chih Lai ,&nbsp;Chi-Ming Tsai ,&nbsp;Wen-Pin Huang ,&nbsp;Chia-An Lee ,&nbsp;Shun-Hao Yang ,&nbsp;Sheng-Po Chang ,&nbsp;Cheng-Huang Kuo ,&nbsp;Shoou-Jinn Chang","doi":"10.1016/j.cjph.2025.05.017","DOIUrl":"10.1016/j.cjph.2025.05.017","url":null,"abstract":"<div><div>A low-temperature (LT) GaN was inserted between the p⁺-GaN and n⁺⁺-GaN to form connecting layers (CLs) of GaN-based tandem light-emitting diodes (T-LEDs). The 120 mA forward voltage (V_f) of the T-LEDs was 7.74 V, which was 2.3 times larger than the V_f of the conventional LEDs (C-LEDs). The T-LEDs’ output powers at 120 mA could reach 274 mW, which was approximately 36.3 % enhancements as compared to the C-LEDs. Meanwhile, the T-LEDs’ peak external quantum efficiency (EQE) of 123.4 % was nearly 1.8 times larger than the C-LEDs’ peak EQE of 70.9 %. The 120 mA V_f of as-grown T-LEDs reduced from 8.83 V to 7.74 V after applying a high current, such as 250 mA. Therefore, the T-LEDs with p⁺-GaN/LT GaN/n⁺⁺-GaN CLs presented write-once characteristics. The write-once property of T-LEDs might be attributed to the improved Mg activation rate of bottom LEDs and the degradation of the LT GaN after high current injection.</div></div>","PeriodicalId":10340,"journal":{"name":"Chinese Journal of Physics","volume":"96 ","pages":"Pages 266-272"},"PeriodicalIF":4.6,"publicationDate":"2025-05-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144139772","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"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}

{"title":"Hybrid high order lattice Boltzmann scheme for turbulent convective-radiative heat transfer problems","authors":"Alexander Nee","doi":"10.1016/j.cjph.2025.05.015","DOIUrl":"10.1016/j.cjph.2025.05.015","url":null,"abstract":"<div><div>This paper presents a numerical solution of combined heat transfer problem by turbulent natural convection and surface thermal radiation. For the first time, the high order hybrid lattice Boltzmann model was built to study turbulent convective-radiative heat transfer. Under this model, thermally-induced flow is described by the mesoscopic lattice Boltzmann equations with high order regularization procedure. Alternatively, heat transfer is computed using the fourth order Runge-Kutta scheme when solving the macroscopic energy equation. The radiosity-irradiation approach is used as a radiation model. The high order hybrid lattice Boltzmann model was carefully tested against benchmark solution of various heat transfer problems presented by other researchers. Variation range of the Rayleigh number, conduction-radiation number and surface emissivity is as follows <span><math><mrow><msup><mrow><mn>10</mn></mrow><mn>10</mn></msup><mo>≤</mo><mi>R</mi><mi>a</mi><mo>≤</mo><msup><mrow><mn>10</mn></mrow><mn>11</mn></msup></mrow></math></span>, <span><math><mrow><mn>351.75</mn><mo>≤</mo><msub><mi>N</mi><mi>r</mi></msub><mo>≤</mo><mn>757.88</mn></mrow></math></span> and <span><math><mrow><mn>0.2</mn><mo>≤</mo><mrow><mi>ε</mi></mrow><mo>≤</mo><mn>1</mn></mrow></math></span>, respectively. Numerical analysis of the first and the second order statistics in terms of temperature, turbulent kinetic energy, etc. was performed. It is found that thermal plumes of different scales are formed at the thermally-insulated walls due to their irradiation when <span><math><mrow><mrow><mi>ε</mi></mrow><mo>≥</mo><mn>0.6</mn></mrow></math></span>. This results in the irregular thermal behavior near the horizontal boundaries. Surface radiation decreases the temperature variance whereas the turbulent kinetic energy and root mean square velocity are enhanced. Moreover, the total mean Nusselt number is decreased up to 14 % when surface emissivity is enhanced from 0.2 to 1. The time-averaged data are presented in this work for validation purposes of semi-empirical turbulence models.</div></div>","PeriodicalId":10340,"journal":{"name":"Chinese Journal of Physics","volume":"96 ","pages":"Pages 425-438"},"PeriodicalIF":4.6,"publicationDate":"2025-05-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144195776","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"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}