Article
Mechanics
Jian-Chao He, Yun Bao, Xi Chen
Summary: Direct numerical simulation (DNS) is conducted for non-slip two dimensional (2D) Rayleigh-Benard convection (RBC) with a wide range of Rayleigh number (Ra up to 10^13), Prandtl number Pr 1/4 0.7, and aspect ratio gamma= 1. The thermal dissipation rate shows an evident scaling transition at Ra asymptotic to 10^9. The mean temperature gradient in the thermal boundary layer is the dominant contribution to the transition. The Nusselt number also exhibits the transition at Ra asymptotic to 10^9. Rating: 7/10.
Article
Mathematics, Applied
P. G. Siddheshwar, C. Kanchana, L. M. Perez, D. Laroze
Summary: This study investigates the linear and nonlinear stability of axisymmetric convection of a viscous fluid in a cylindrical enclosure heated from below with different radius to height ratios. The use of a Maclaurin series representation for the eigenfunctions of the linear problem and its application in determining the solution with the convective mode is a novelty in this study. Furthermore, the influence of boundaries and the effect of throughflow on chaotic and periodic regimes of motion are studied.
COMMUNICATIONS IN NONLINEAR SCIENCE AND NUMERICAL SIMULATION
(2023)
Article
Mechanics
Sebastian Moller, Theo Kaeufer, Ambrish Pandey, Joerg Schumacher, Christian Cierpka
Summary: Turbulent superstructures in horizontally extended three-dimensional Rayleigh-Benard convection flows are investigated in controlled laboratory experiments in water at Prandtl number Pr = 7. The experimental results confirm that the superstructure patterns are an important backbone of the heat transfer.
JOURNAL OF FLUID MECHANICS
(2022)
Article
Mechanics
Alessandro De Rosis, Giovanni Giustini
Summary: This paper analyzes the flow and heat transfer regimes in Rayleigh-Benard convection with a melting boundary using numerical simulations. The results provide insight into the complex behavior of thermal convection, melting, and fluid dynamics.
Article
Thermodynamics
Justine Noel, Christel Metivier, Simon Becker, Sebastien Leclerc
Summary: Natural convection in melting material was experimentally studied using Magnetic Resonance Imaging. The experiments revealed enhanced transient evolution of liquid height under convection, as well as a 4-fold increase in steady averaged liquid height in the convective regime. The convection patterns observed were in the form of hexagons/polygons, with scaling laws converging to beta = 1/4 showing an increase in convective intensity.
INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER
(2022)
Article
Mathematics, Applied
Xinghong Pan
Summary: This paper extends previous results on the global regularity of solutions for the three-dimensional non-resistive MHD system and non-diffusive Boussinesq system by showing that solutions of the three-dimensional non-resistive and non-diffusive MHD-Boussinesq system are globally regular when the initial data is axisymmetric and the swirl components of the velocity and the magnetic vorticity are zero. The method used here can also be applied to the magnetic Rayleigh-Benard convection system.
ACTA APPLICANDAE MATHEMATICAE
(2022)
Article
Thermodynamics
Joauma Marichal, Miltiadis Papalexandris
Summary: This paper presents a numerical study of the dynamics of the Large-Scale Circulation (LSC) in turbulent convection with a free surface. Through Large-Eddy Simulations, it is found that the LSC is driven by plume formation at the top and bottom boundaries and reorientation events occur. The most frequent event is the change of orientation plane, while changes in the direction of circulation are scarce. Moreover, the frequency of reorientations decreases as the Rayleigh number increases. It is also noted that reorientation events have an impact on the statistics of the fluctuating component of the horizontal velocity.
INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER
(2022)
Article
Mechanics
Shashwat Bhattacharya, Mahendra K. Verma, Arnab Bhattacharya
Summary: A multivariate regression model and a neural network model were developed in this paper to predict the Reynolds number and Nusselt number in turbulent thermal convection. By comparing with earlier models, it was found that the machine-learning models in this work provided the best match with the experimental and numerical results.
Article
Mechanics
Alexander Blass, Roberto Verzicco, Detlef Lohse, Richard J. A. M. Stevens, Dominik Krug
Summary: In this study, large-scale circulation of turbulent Rayleigh-Benard convection was investigated in a large container with high Rayleigh number conditions. The results showed that the properties of LSC remain consistent even with varying boundaries, and the transition to the ultimate regime is predicted to occur in unconstrained geometries. Additionally, observations were in line with experimental data from Gottingen.
JOURNAL OF FLUID MECHANICS
(2021)
Article
Physics, Multidisciplinary
P. Urban, T. Kralik, M. Macek, P. Hanzelka, T. Veznik, L. Skrbek
Summary: This experimental study focused on the role of boundary conditions in turbulent thermal convection of cryogenic helium gas at high Rayleigh numbers. Switching between constant heat flux and constant temperature boundary conditions resulted in significant changes in temperature fluctuations at the bottom plate, while top plate dynamics and bulk convective flow remained unaffected. There were no observable changes in Reynolds number scaling, Nusselt number scaling, or rate of direction reversals of large scale circulation within the experimental accuracy.
Article
Multidisciplinary Sciences
Joon Seo Lim, Cheolwon Moon, Junyeop Lee
Summary: The presence of subretinal fluid (SRF) in eyes with central serous chorioretinopathy (CSC) is associated with disturbances in retinal blood flow, including reduced venous blood flow velocity and rate, as well as changes in venous diameter. SRF thickness is correlated with a decrease in venous blood flow rate, suggesting that SRF plays a role in altering retinal blood flow dynamics.
SCIENTIFIC REPORTS
(2022)
Article
Chemistry, Multidisciplinary
Massimo Corcione, Alessandro Quintino
Summary: This study presents a numerical investigation on Rayleigh-Benard convection in a shallow cavity filled with different metal-oxide water-based nanofluids. The dispersion of nanoparticles into the base fluid enhances the stability of the nanofluid layer and determines the conditions for convection onset.
APPLIED SCIENCES-BASEL
(2022)
Article
Polymer Science
Navid Chapman, Mingyu Chapman, William B. Euler
Summary: The morphology of sub-micron poly(methyl methacrylate) films coated onto glass supports by spin coating from toluene was investigated, revealing wrinkled surfaces with local quasi-sinusoidal periodicity on films thicker than 75 nm. The surface wrinkles, attributed to convective instabilities, had large aspect ratios with wavelengths in the tens of microns and amplitudes in the tens of nanometers. The study also explored the effects of film thickness, coating solution concentration, and drying rate on the thin film surface morphology.
Article
Thermodynamics
A. . A. . Mohekar, B. S. Tilley, V. V. Yakovlev
Summary: Electromagnetic heat exchangers play a critical role in power beaming applications, converting incident energy into heat or mechanical work. Coolants in the system should be in gaseous phase to avoid thermal runaway. A model system consisting of a horizontal channel with a viscous, dielectric fluid and a grounded ceramic receiver is investigated, and three modes of instability are found: thermal runaway, Rayleigh-Benard convection, and a novel fringe-field instability. (c) 2023 Elsevier Ltd. All rights reserved.
INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER
(2023)
Article
Mechanics
K. R. Raghunatha, I. S. Shivakumara
Summary: The stability of a triply diffusive viscoelastic fluid layer with fluid density depending on three stratifying agencies of different diffusivities was investigated using the Oldroyd-B constitutive equation. Analytical expressions for steady and oscillatory onset were obtained, with a boundary identified in the viscoelastic parameters plane. The study also analyzed the influence of Prandtl number and viscoelastic parameters on heat and mass transfer convection modes.
Article
Veterinary Sciences
Noymi Basumatary, Dipankar Baruah, Paresh Kumar Sarma, Manab Deka, Jatin Sarmah
Summary: The study found a higher prevalence of G6PD deficiency in males compared to females in Proto-Australoid tribal population. Hematological parameters related to G6PD showed significant positive correlation with red blood cell indices.
EXPLORATORY ANIMAL AND MEDICAL RESEARCH
(2021)
Article
Agriculture, Dairy & Animal Science
Rijumoni Daimari, Silistina Narzari, Jatin Sarmah, Manab Deka
Summary: This study investigated the nutritional content of five different muscles from Ghungroo pigs and found significant differences in protein, fat, ash, minerals, and fatty acid composition among different muscles. The findings provide valuable insights for improving meat quality and value addition.
INDIAN JOURNAL OF ANIMAL RESEARCH
(2022)
Article
Gastroenterology & Hepatology
Premashis Kar, Bhabadev Goswami, Jagdish Mahanta, Thngam Bhimo, Anup K. Das, Manab Deka, Kyrshanlang G. Lynrah, Mool R. Kotwal, Pradip Bhaumik, Moji Jini, Rahul Karna, Vijay K. Karra, Harpreet Kaur
Summary: This study aimed to estimate the burden of HBV infection in Northeast India, revealing a high prevalence of infection, heterogeneous genotype distribution, and presence of mutations, potentially leading to different rates of liver disease progression and prognosis. Further research is needed to understand the clinical significance of multiple genotypes and mutations in this unique population.
JOURNAL OF CLINICAL AND EXPERIMENTAL HEPATOLOGY
(2022)
Article
Food Science & Technology
Pragya Sharma, Jon Jyoti Kalita, Papori Buragohain, Manab Deka
Summary: In this study, a single-stranded DNA aptamer specifically binding to the thermostable direct hemolysin toxin of Vibrio parahemolyticus was selected for the first time. The aptamer, Ap3, showed high affinity and specificity for the toxin, making it a potential detecting probe for high-end seafood risk assessment and safety analysis.
ACS FOOD SCIENCE & TECHNOLOGY
(2022)
Article
Agriculture, Multidisciplinary
Manab Deka, Sangeeta Kalita
Summary: The economy of Assam struggles to keep up with the growth rate of India, despite its rich natural resources and significant contribution to the country's petroleum needs. Recent analysis shows signs of improvement, with the state GDP being primarily driven by capital formation and bank credit playing a crucial role in output growth.
INTERNATIONAL JOURNAL OF AGRICULTURAL AND STATISTICAL SCIENCES
(2021)
Meeting Abstract
Gastroenterology & Hepatology
Premashis Kar, Bhabadev Goswami, Jagdish Mahanta, Thongam Bhimo, Anup Kumar Das, Manab Deka, Kyrshanlang G. Lynrah, Mool Raj Kotwal, Pradip Bhaumik, Moji Jini, Rahul Karna, Vijaya Kumar Karra
JOURNAL OF HEPATOLOGY
(2020)
Article
Biotechnology & Applied Microbiology
Sutopa Das, Arun Prasad, Krishna Sarma, Subhash Medhi, Sujoy Bose, Manab Deka
JOURNAL OF PURE AND APPLIED MICROBIOLOGY
(2014)