Chinese Journal of Physics最新文献

{"title":"Biomechanical analysis of cilia-induced liquid propulsion in rough porous passageway under magnetic field control: MATLAB- and Mathematica-based simulations","authors":"Zeeshan Asghar ,&nbsp;Muhammad Waris Saeed Khan ,&nbsp;Abeer Alhashash ,&nbsp;Muhammad Asif Gondal","doi":"10.1016/j.cjph.2025.02.028","DOIUrl":"10.1016/j.cjph.2025.02.028","url":null,"abstract":"<div><div>Biological processes like mucus movement in the respiratory tract, circulation of cerebrospinal liquid, and sperm cell propulsion all rely on cilia-driven flow. Understanding the importance of the cilia-driven flow of generalized Newtonian fluid with surface roughness is critical for determining the biomechanics of these mechanisms and their consequences for several kinds of diseases. Motivated by these important applications, this article aims to examine the impact of surface roughness along with magnetic field inside horizontal passage using the Carreau–Yasuda (C.Y) model. Moreover, the effect of the porous medium is also considered. The flow equations are developed using the lubrication approximation. The MATLAB bvp5c and Mathematica NDSolve are utilized to solve boundary value problems. The validation of the numerical approach is made with a limiting case. The impact of various parameters on streamlines, velocity, and pressure gradient are shown graphically. This analysis reveals that surface roughness, magnetic field, and porous medium strongly impact streamline topologies, velocity, and pressure gradient. For accuracy, surface roughness plays a crucial role in developing various medical devices.</div></div>","PeriodicalId":10340,"journal":{"name":"Chinese Journal of Physics","volume":"95 ","pages":"Pages 455-475"},"PeriodicalIF":4.6,"publicationDate":"2025-02-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143738742","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":"Phase transitions in car-following model integrating the comprehensive deviations collaboration effect under V2X environment","authors":"Guanghan Peng ,&nbsp;Chunli Luo ,&nbsp;Huili Tan","doi":"10.1016/j.cjph.2025.02.024","DOIUrl":"10.1016/j.cjph.2025.02.024","url":null,"abstract":"<div><div>Based on cyber physical systems, a novel car-following model is raised by integrating the comprehensive deviations collaboration effect (CDCE) including headway and speed under V2X environment. The CDCE is intimately connected to the stability condition and mKdV equations through theoretical analysis, which shows that the CDCE effectively promotes the stability of traffic flow. Moreover, the headway variation and the hysteresis loop in traffic system are gradually decreasing owing to amplifying the CDCE through simulation, which reveals that the CDCE greatly alleviates traffic congestion. More importantly, we build a new energy consumption model to investigate the CDCE model. It is found that the CDCE can significantly reduce energy consumption due to cooperating with the CDCE of headway and speed under V2X environmenton.</div></div>","PeriodicalId":10340,"journal":{"name":"Chinese Journal of Physics","volume":"94 ","pages":"Pages 789-797"},"PeriodicalIF":4.6,"publicationDate":"2025-02-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143534519","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":"Investigating the thermal dynamics of two-layered immiscible fluids in corrugated curved channel with applied heat source","authors":"Nomana Abid,&nbsp;Jafar Hasnain","doi":"10.1016/j.cjph.2025.02.019","DOIUrl":"10.1016/j.cjph.2025.02.019","url":null,"abstract":"<div><div>The corrugated curved channels (CCs) in heat exchangers can enhance the heat transfer where two immiscible fluids are used, by promoting interfacial areas. The results of this study may inspire creative designs for thermal management systems, which could result in the creation of new applications and technology. The corrugations improve the energy collection and conversion efficiency. In solar thermal collectors, a heat source in corrugated curved channels is used to improve solar energy absorption to transfer it to a working fluid. On the other hand, the heat sinks are used to remove the heat that is not needed during the chemical separation processes. With this motivation, the main aim of this study is to analyze the heat transfer enhancement in two-layered immiscible viscous fluids (VFs) flow by using the heat source/sink phenomenon. The curved channel is divided into two regions. Both regions are occupied with VFs having different viscosities. The flow is caused by a constant pressure gradient. The analytical expressions for velocity and temperature are obtained through the perturbation series method (in terms of small corrugation amplitude <span><math><mrow><mrow><mi>ε</mi></mrow><mo>≪</mo><mn>1</mn></mrow></math></span>) by solving the mathematical model of partial differential equations. The effect of different parameters on fluid and heat flow is analyzed through graphs and contours. Moreover, the shear stresses (SS) at the walls of CC with corrugated boundaries, rate of heat transport and volume flow rate (VFR) are also analyzed and discussed. The results show that the heat is more enhanced when a heat source is provided to the system whereas a heat sink causes a fall in heat through the immiscible VFs flow. So, to enhance the heat when necessary, a heat source can be used in corrugated CC. Furthermore, SS is decreased when the wavenumber is increased. The wavenumber implies a small corrugation wavelength which leads to a more undulating path. For this type of path, a larger amount of SS is needed for fluid to flow at walls.</div></div>","PeriodicalId":10340,"journal":{"name":"Chinese Journal of Physics","volume":"95 ","pages":"Pages 190-204"},"PeriodicalIF":4.6,"publicationDate":"2025-02-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143620216","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":"A front-fixing method for the nonlinear and coupled phase change model in a moving domain","authors":"Jaya Joshi,&nbsp;Rajeev","doi":"10.1016/j.cjph.2025.02.013","DOIUrl":"10.1016/j.cjph.2025.02.013","url":null,"abstract":"<div><div>This study presents a mathematical model for a sublimation problem in a two-phase region which involves temperature and concentration-dependent thermophysical properties to investigate the temperature distribution and mass density in both regions. The numerical solution to the problem is acquired by employing a front-fixing explicit finite difference method. The consistency and stability of the numerical scheme are theoretically analyzed. The accuracy of the presented method is validated through a comparison with the exact solution achieved in a particular case and it is identified that current results are sufficiently near to them. The consequences of different dimensionless parameters on temperature and sublimation curve are presented graphically. The findings from this study provide some ways to accelerate the speed of phase transition with minimal energy absorption of particles during the sublimation process.</div></div>","PeriodicalId":10340,"journal":{"name":"Chinese Journal of Physics","volume":"95 ","pages":"Pages 29-43"},"PeriodicalIF":4.6,"publicationDate":"2025-02-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143548088","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":"Advanced electrotunable linear polarization rotator with high degree of linear polarization using dye-doped 90°-twisted nematic liquid crystals","authors":"Yi-Xuan Liu ,&nbsp;Pravinraj Selvaraj ,&nbsp;Chi-Tang Huang,&nbsp;Yu-Hsiang Tseng,&nbsp;Wei-Hao Chen,&nbsp;Ching-Cherng Sun,&nbsp;Ko-Ting Cheng","doi":"10.1016/j.cjph.2025.02.020","DOIUrl":"10.1016/j.cjph.2025.02.020","url":null,"abstract":"<div><div>Considerable attention has been allotted to the generation and manipulation of polarization light due to its unique optical properties and potential applications. Nevertheless, existing polarization rotators are limited in their capability to provide continuous linear polarization rotation and maintain a high degree of linear polarization (DoLP) via electric stimuli, and this condition is severely inherent in their system design flexibility. In this study, we enhance the performance of a continuously electrotuneable linear polarization rotator by utilizing dye-doped 90°-twisted nematic liquid crystals (90°-TNLCs). Despite a slight decrease in light intensity under an electric stimulus, the polarization rotators maintain a consistently high DoLP due to the dichroic dye's absorption anisotropy and the selective absorption of elliptically polarized transmitted light along the short axis. This mechanism effectively migrated the degradation of DoLP. Additionally, we investigated the comparative absorption characteristics between 90°-twisted nematic and homogeneous alignment LCs. This pioneering innovation offers unprecedented versatility in linear polarization control, which paves the way for advanced application in polarization modulation technologies.</div></div>","PeriodicalId":10340,"journal":{"name":"Chinese Journal of Physics","volume":"95 ","pages":"Pages 205-211"},"PeriodicalIF":4.6,"publicationDate":"2025-02-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143620415","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":"Phase-modulated quantum routing with a giant atom","authors":"Shu-Qing Mo ,&nbsp;Guo-An Yan ,&nbsp;Hua Lv","doi":"10.1016/j.cjph.2025.02.010","DOIUrl":"10.1016/j.cjph.2025.02.010","url":null,"abstract":"<div><div>The coupling between giant atoms and waveguides is of great significance in quantum information science. We utilize a giant atom coupled with two waveguides to achieve a highly efficient, secure, and directional addressing quantum routing scheme. By adjusting the phases, single-photon transmission rates with high efficiencies can be obtained. Moreover, a potential implementing platform for our theoretical scheme is proposed based on the superconducting circuit. The feasibility of the proposed platform is confirmed by careful numerical selection and analysis. We hope that the research can potentially contribute to the development of future quantum networks.</div></div>","PeriodicalId":10340,"journal":{"name":"Chinese Journal of Physics","volume":"95 ","pages":"Pages 44-52"},"PeriodicalIF":4.6,"publicationDate":"2025-02-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143562843","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":"Fluid modeling of the atmospheric pressure helium direct current microdischarge coupled with the two-term Boltzmann equation","authors":"Ying Wang ,&nbsp;Ye Tian ,&nbsp;K.M. Rabadanov ,&nbsp;A.A. Kudryavtsev ,&nbsp;Chengxun Yuan","doi":"10.1016/j.cjph.2025.02.018","DOIUrl":"10.1016/j.cjph.2025.02.018","url":null,"abstract":"<div><div>We examine the Space-Dependent Electron Energy Distribution Function model coupled with plasma fluid equation for atmospheric pressure direct current microdischarge in helium. The simulation were performed in COMSOL Multiphysics using Plasma Module. In the model, the Boltzmann equation in the classical two-term approximation is solved for each position of the discharge region and is coupled with the plasma fluid equations by way of the electron mean energy. Utilizing initial data derived from the Boltzmann equation solution, the rate constants and transport coefficients are computed, which are used in the fluid model, thus closing the computational loop. To validate this approach, we compare simulation results with both the outcomes of the “local mean energy approximation” model and experimental data. Here we show that simulation results exhibit good agreement with experimental results, underscoring the fidelity of using coupled computational approach. Furthermore, disparities between using here the Space-Dependent Electron Energy Distribution Function model and the “local mean energy approximation” model highlight the importance of considering self-consistent computational approaches in atmospheric pressure microdischarge modeling and analysis.</div></div>","PeriodicalId":10340,"journal":{"name":"Chinese Journal of Physics","volume":"95 ","pages":"Pages 298-305"},"PeriodicalIF":4.6,"publicationDate":"2025-02-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143644586","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":"A thermodynamic model for dark energy including particle creation or destruction processes","authors":"José Medeiros da Costa Netto,&nbsp;Heydson Henrique Brito da Silva","doi":"10.1016/j.cjph.2025.02.007","DOIUrl":"10.1016/j.cjph.2025.02.007","url":null,"abstract":"<div><div>Thermodynamic analyses of dark energy as a relativistic fluid indicates that this intriguing component of the universe mimics a bulk viscous pressure when the parameter of its barotropic equation of state varies with time. Since in cosmology bulk viscosity and creation or destruction of matter are closely linked processes, we propose in this work a brief thermodynamic study of dark energy considering that particles can be created or destroyed in the fluid. We derive new expressions for quantities such as particle density, entropy density etc. that have been shown to be sensitive to this new ingredient. We also obtain new thermodynamic constraints and compare them with those where the number of particles is conserved. In particular, we found that in the presence of a sink, dark energy tends towards the cosmological constant over time regardless of the sign of its chemical potential and without violating the laws of thermodynamics.</div></div>","PeriodicalId":10340,"journal":{"name":"Chinese Journal of Physics","volume":"94 ","pages":"Pages 684-689"},"PeriodicalIF":4.6,"publicationDate":"2025-02-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143519681","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":"Possible existence of ghost stars in the context of electromagnetic field","authors":"Tayyab Naseer ,&nbsp;K. Hassan ,&nbsp;M. Sharif","doi":"10.1016/j.cjph.2025.02.009","DOIUrl":"10.1016/j.cjph.2025.02.009","url":null,"abstract":"<div><div>In this paper, we discuss the existence of ghost star models in the Einstein–Maxwell framework. In order to explore these objects, we put forward the idea of Zeldovich and Novikov by keeping in mind that the energy density of such models lie in the negative range in some regions of the spacetime geometry. We proceed by taking into account a static sphere and develop the field equations for a charged anisotropic fluid configuration. The two generating functions are then considered and we rewrite the field equations in terms of the mass and these physical quantities. Afterwards, we formulate two different models using the conformally flatness condition along with the considered generating functions. Further, we adopt the vanishing complexity constraint as well as null active gravitational mass to find two more solutions. The energy density for all developed models is also graphically shown. We conclude that the ghost stars exist in the presence of charge as the energy density for all the resulting solutions lie in the negative region for a particular range of the radial coordinate.</div></div>","PeriodicalId":10340,"journal":{"name":"Chinese Journal of Physics","volume":"94 ","pages":"Pages 594-608"},"PeriodicalIF":4.6,"publicationDate":"2025-02-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143480007","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":"Charged analogues of singularity-free anisotropic compact stars under linear f(Q)-action","authors":"Debadri Bhattacharjee,&nbsp;Pradip Kumar Chattopadhyay","doi":"10.1016/j.cjph.2025.02.008","DOIUrl":"10.1016/j.cjph.2025.02.008","url":null,"abstract":"<div><div>This study simulates the characteristics of spherically symmetric, anisotropic compact stellar bodies with electrical charge within the framework of the <span><math><mrow><mi>f</mi><mrow><mo>(</mo><mi>Q</mi><mo>)</mo></mrow></mrow></math></span> theory of gravity. Employing the Krori–Barua metric ansatz (K.D. Krori, J. Barua, J. Phys. A: Math. Gen. 8 (1975) 508) along with a linear form of <span><math><mrow><mi>f</mi><mrow><mo>(</mo><mi>Q</mi><mo>)</mo></mrow></mrow></math></span> model, <em>viz.</em>, <span><math><mrow><mi>f</mi><mrow><mo>(</mo><mi>Q</mi><mo>)</mo></mrow><mo>=</mo><msub><mrow><mi>α</mi></mrow><mrow><mn>0</mn></mrow></msub><mo>+</mo><msub><mrow><mi>α</mi></mrow><mrow><mn>1</mn></mrow></msub><mi>Q</mi></mrow></math></span>, we obtain a tractable set of exact relativistic solutions of the field equations. A specific form of charge <span><math><mrow><mo>(</mo><mi>q</mi><mo>=</mo><msub><mrow><mi>q</mi></mrow><mrow><mn>0</mn></mrow></msub><msup><mrow><mi>r</mi></mrow><mrow><mn>3</mn></mrow></msup><mo>)</mo></mrow></math></span> is considered here for the present analysis. It is noted that the model is valid up to the value of charge intensity <span><math><mrow><msub><mrow><mi>q</mi></mrow><mrow><mn>0</mn></mrow></msub><mo>≤</mo><mn>0</mn><mo>.</mo><mn>0009</mn><mspace></mspace><msup><mrow><mi>Km</mi></mrow><mrow><mo>−</mo><mn>2</mn></mrow></msup></mrow></math></span>. Beyond this value, the model does not permit physically viable results. We have obtained the best fit equation of state in the model, which is incorporated to solve the TOV equations numerically to determine the mass–radius relation within the parameter space used here. With increasing charge intensity <span><math><mrow><mo>(</mo><msub><mrow><mi>q</mi></mrow><mrow><mn>0</mn></mrow></msub><mo>)</mo></mrow></math></span> from 0.0002 to 0.0009, the maximum mass ranges from 2.84–<span><math><mrow><mn>2</mn><mo>.</mo><mn>92</mn><mspace></mspace><msub><mrow><mi>M</mi></mrow><mrow><mo>⊙</mo></mrow></msub></mrow></math></span>, and the corresponding radii range from 12.00–12.20 Km. Moreover, the predicted radii of some recently observed pulsars and GW 190814 show that our model also complies with the estimated radii based on the observational results. Our model is found to satisfy all the characteristic features, such as behaviour of matter variables, causality condition, energy constraints and stability criteria, which are pertinent in the context of a stable stellar configuration to emerge as a viable and physically acceptable stellar model in the framework of <span><math><mrow><mi>f</mi><mrow><mo>(</mo><mi>Q</mi><mo>)</mo></mrow></mrow></math></span> gravity.</div></div>","PeriodicalId":10340,"journal":{"name":"Chinese Journal of Physics","volume":"94 ","pages":"Pages 650-669"},"PeriodicalIF":4.6,"publicationDate":"2025-02-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143487057","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}