Article
Physics, Multidisciplinary
Zhonghai Zhao, Honghai An, Yu Xie, Zhu Lei, Weipeng Yao, Wenqiang Yuan, Jun Xiong, Chen Wang, Junjian Ye, Zhiyong Xie, Zhiheng Fang, Anle Lei, Wenbing Pei, Xiantu He, Weimin Zhou, Wei Wang, Shaoping Zhu, Bin Qiao
Summary: This laboratory-based experiment investigates asymmetric magnetic reconnections in a hybrid collisional-collisionless regime, revealing the rapid growth of tearing instability and the formation of multiple plasmoids.
COMMUNICATIONS PHYSICS
(2022)
Article
Environmental Sciences
Leopold Desage, Alain Herique, Sylvain Doute, Sonia Zine, Wlodek Kofman
Summary: This paper focuses on the analysis of the first tens of meters of the Martian subsurface using the SHARAD radar. It compares the use of different high-resolution DTMs for radar simulation, namely, from the HRSC onboard Mars Express and the CTX onboard MRO. The study shows that the HRSC DTM failed to reproduce the surface echo visible on SHARAD data, and also highlights the potential artifacts in optical DTMs that can complicate radar analysis.
Article
Physics, Multidisciplinary
Daniel G. Figueroa, Joanes Lizarraga, Ander Urio, Jon Urrestilla
Summary: This study focuses on the nonlinear dynamics of axion inflation, highlighting the importance of considering inhomogeneity effects. The results reveal new insights into the behavior of axion inflation and have significant implications for its phenomenology and observability.
PHYSICAL REVIEW LETTERS
(2023)
Article
Thermodynamics
Ambuj Amitab Jha, Amit Agrawal
Summary: The present numerical work investigates the heat transfer characteristics in mildly rarefied gaseous Nitrogen flows. The study analyzes the behavior of thermal flow field with increasing rarefaction and establishes the dependence of Nusselt number on Knudsen number and Reynolds number. The findings show that the fully developed Nusselt number reaches a maximum value at a certain Knudsen number and Reynolds number, and then decreases with further increase in Knudsen number. The axial span of the thermally fully developed region also decreases with rising degree of rarefaction. The strength of viscous dissipation remains negligible, and the increase in kinetic energy due to expansion work becomes smaller as rarefaction increases.
INTERNATIONAL JOURNAL OF THERMAL SCIENCES
(2023)
Article
Green & Sustainable Science & Technology
Narita Chanthon, Kanokwan Ngaosuwan, Worapon Kiatkittipong, Doonyapong Wongsawaeng, Weerinda Appamana, Armando T. Quitain, Suttichai Assabumrungrat
Summary: The study focuses on optimizing the flow regime of alkali-catalyzed transesterification for enhancing biodiesel production rate. The optimal operating condition is found to be a 6:1 methanol-to-oil molar ratio, a total flowrate of 30 mL/min, and a rotational speed of 1000 rpm.
RENEWABLE & SUSTAINABLE ENERGY REVIEWS
(2021)
Article
Physics, Fluids & Plasmas
Alistair M. M. Arnold, Pavel Aleynikov, Boris N. N. Breizman
Summary: The problem of electron dynamics on a closed magnetic field line passing through a high-Z plasmoid is studied. The electron kinetic equation is integrated over bounce motion and pitch angle, resulting in a nonlinear integro-differential operator in a new invariant. Numerical solutions are obtained, showing the unique collisional heating rate by the ambient plasma due to the deep trapping of cold electrons in a potential with a parabolic peak.
JOURNAL OF PLASMA PHYSICS
(2023)
Article
Physics, Fluids & Plasmas
Nisar Ahmad, Ping Zhu, Ahmad Ali, Shiyong Zeng
Summary: The evolution of a highly unstable m = 1 resistive tearing mode, leading to plasmoid formation in a Harris sheet, is studied in this work using the Non-Ideal Magnetohydrodynamics with Rotation, Open Discussion simulation. Two distinctive viscous regimes are found for the plasmoid formation and saturation, with the plasmoid width increasing sharply with viscosity in the low viscosity regime and gradually decreasing with viscosity in the viscosity dominant regime. The role of viscosity in modulating the plasmoid formation process through its effects on the plasma flow and reconnection is quantified.
PLASMA SCIENCE & TECHNOLOGY
(2022)
Article
Multidisciplinary Sciences
Xiaoli Yan, Zhike Xue, Chaowei Jiang, E. R. Priest, Bernhard Kliem, Liheng Yang, Jincheng Wang, Defang Kong, Yongliang Song, Xueshang Feng, Zhong Liu
Summary: Magnetic reconnection is an energy conversion process that operates at microscopic scales but has macroscopic consequences. Solar flares provide a laboratory for studying this process, and this study combines high resolution imaging and spectral observations with data-constrained modeling to analyze the dynamics of a confined solar flare. The results show evidence of magnetic reconnection in the flare, revealing plasmoids and turbulent motions.
NATURE COMMUNICATIONS
(2022)
Article
Chemistry, Inorganic & Nuclear
Nisar Ahmad, Ping Zhu, Chao Shen, Ahmad Ali, Shiyong Zeng
Summary: This paper studies the effects of viscosity on the evolution of the double tearing mode (DTM) in a pair of adjacent Harris sheets. It finds that a transition occurs in the generation of normal and monster plasmoids at P-r=1, and in the P-r<1 regime, both normal and monster plasmoids are generated, which is not observed in single tearing mode cases. When P-r exceeds the critical value, the generation of monster plasmoids stops, and a quadrupolar flow along the poloidal direction is observed in the P-r<1 regime, but this flow is inhibited in the Pr>1 regime.
Article
Mechanics
Veronique Chireux, Philippe Tordjeman, Frederic Risso
Summary: This study investigates the dynamics of the connecting bridge between two approaching liquid droplets in the regime where inertia plays a major role. The expansion of the bridge and its shape are found to vary significantly depending on the Ohnesorge number. At higher Oh values, the bridge expansion is driven by capillary pressure, resulting in a smooth parabolic shape, while at smaller Oh values, the bridge length grows at a constant speed with slope discontinuities at the interface.
Article
Thermodynamics
Olatomide G. Fadodun, Adebimpe A. Amosun, Nonso L. Okoli, David O. Olaloye, Johnson A. Ogundeji, Solomon S. Durodola
Summary: This study numerically investigates the entropy production rate in single-walled carbon nanotubes (SWCNTs)/H2O nanofluid flowing through an inwardly corrugated pipe in turbulent flow regime. The results show that an increase in SWCNT-water nanofluid concentration and corrugation amplitude leads to a decrease in thermal entropy production but an increase in viscous entropy production.
JOURNAL OF THERMAL ANALYSIS AND CALORIMETRY
(2021)
Article
Astronomy & Astrophysics
Luc H. M. Rouppe van der Voort, Michiel van Noort, Jaime de la Cruz Rodriguez
Summary: This study investigates the enhanced emission in the Balmer hydrogen lines known as Ellerman bombs, which are caused by magnetic reconnection in the deep solar atmosphere. By analyzing unique spectroscopic observations of Ellerman bombs in the H alpha line, the researchers effectively traced magnetic reconnection below the canopy of chromospheric fibrils.
ASTRONOMY & ASTROPHYSICS
(2023)
Article
Computer Science, Interdisciplinary Applications
Jianhong Wu
Summary: This paper introduces a new method for estimating high-dimensional factor models, where the number of thresholds is determined by comparing the number of factors in adjacent subintervals. The thresholds are then estimated one by one to obtain factors and loadings, and the performance of the method is demonstrated in finite samples.
COMPUTATIONAL STATISTICS & DATA ANALYSIS
(2021)
Article
Physics, Multidisciplinary
T. C. Sushma, N. Nalinakshi, P. A. Dinesh, D. V. Jayalakshmamma, T. Sravan Kumar
Summary: In this study, an exact solution for steady incompressible axisymmetric electrically conducting fluid flow through a semi-porous media surrounded by an impervious cylinder is reported. The flow model is improved by incorporating convection terms to account for the effect of Joule heating. The non-dimensional parameters governing the flow are transformed using the Differential Transform Method (DTM) to obtain a concise solution for velocity and temperature, and their variations are observed for different dimensionless parameters.
CHINESE JOURNAL OF PHYSICS
(2023)
Article
Astronomy & Astrophysics
Jarrett Rosenberg, Fatima Ebrahimi
Summary: This study examines the evolution of current sheets in accretion flows undergoing magnetorotational instability through numerical modeling in global cylindrical geometry. It is found that in both 2D and 3D, current sheets attract each other and merge when axisymmetric modes dominate, driving magnetic reconnection, whereas at high Lundquist numbers the current sheets become thin and subject to plasmoid instability. When nonaxisymmetric 3D modes dominate, turbulence makes the current sheets more unstable and stretch vertically.
ASTROPHYSICAL JOURNAL LETTERS
(2021)
