Article
Engineering, Multidisciplinary
S. M. H. Mirkarimi, M. J. Hosseini, Y. Pahamli
Summary: In this study, four curved passive micromixers with different arrangements of cylindrical obstacles alongside with simple curved channel were considered and assessed. The results showed that the special arrangement of the obstacles led to an increase in mixing efficiency at low Reynolds numbers, with Case-B and Case-E performing the best among different configurations.
ALEXANDRIA ENGINEERING JOURNAL
(2023)
Article
Nanoscience & Nanotechnology
Reza Karimi, Sajad Rezazadeh, Mohammad Raad
Summary: This paper presents a three-dimensional study of the nitrogen and oxygen mixing process in a T-type micromixer, and validates the improvement of mixing quality by introducing SAR structures. It is found that at low Reynolds numbers, the mixing quality is high, and increasing the cross-section area of mixing units can enhance mixing quality.
MICROFLUIDICS AND NANOFLUIDICS
(2021)
Article
Computer Science, Interdisciplinary Applications
Shang-Gui Cai, Johan Degrigny, Jean-Francois Boussuge, Pierre Sagaut
Summary: An improved coupling method of immersed boundary method and turbulence wall models on Cartesian grids is proposed to generate smooth wall surface pressure and skin friction at high Reynolds numbers. Various modifications are presented to enhance the near wall solution, and the validity of the method is demonstrated through numerical benchmark tests.
JOURNAL OF COMPUTATIONAL PHYSICS
(2021)
Article
Engineering, Multidisciplinary
Xueying Zhang, Yangjiong Wu
Summary: This paper proposes a high resolution strategy for the localized method of approximate particular solutions (LMAPS). The strategy aims to improve the accuracy and stability of numerical calculation by selecting upwind interpolation templates. Numerical results demonstrate that the proposed high-resolution LMAPS is effective and accurate, especially for solving the Navier-Stokes equations with high Reynolds number.
ENGINEERING ANALYSIS WITH BOUNDARY ELEMENTS
(2024)
Article
Mathematics, Applied
Elizabeth Carlson, Adam Larios
Summary: The well-posedness of the formal sensitivity equations with respect to viscosity for the 2D incompressible Navier-Stokes equations is rigorously proven in this study, showing convergence of difference quotients to the unique solution of the sensitivity equations. This proof method provides uniform bounds on difference quotients, indicating stable behavior of parameter recovery algorithms as the system evolves. Additionally, the analysis can be extended to the sensitivity of the 2D Euler equations to viscous regularization, marking a significant development in understanding the global existence and uniqueness of sensitivity equations in fluid dynamics.
JOURNAL OF NONLINEAR SCIENCE
(2021)
Article
Mechanics
Y. Marchenay, F. Chedevergne, M. Olazabal Loume
Summary: A new modeling strategy is proposed to predict the combined effects of roughness and blowing boundary conditions. Analysis of experimental data reveals deficiencies in existing roughness corrections when predicting the effect of blowing in the presence of surface roughness.
Article
Chemistry, Analytical
Abdelkader Mahammedi, Naas Toufik Tayeb, Kwang-Yong Kim, Shakhawat Hossain
Summary: A numerical investigation was conducted to analyze the mixing behaviors of non-Newtonian shear-thinning fluids in Kenics micromixers. The study showed that micro-Kenics exhibit high mixing performances under a wide range of Reynolds numbers.
Article
Engineering, Multidisciplinary
Hassnia Hajji, Lioua Kolsi, Kaouther Ghachem, Chemseddine Maatki, Ahmed Kadhim Hussein, Mohamed Naceur Borjini
Summary: This study presents two and three-dimensional numerical simulations of flow through sudden expansion and contraction microchannels. Results show the appearance of a separate vortex in the corner after sudden expansion for low Reynolds numbers, with the vortex separation length increasing for high Reynolds numbers. The three-dimensional character of flow is more pronounced for higher Reynolds numbers.
ALEXANDRIA ENGINEERING JOURNAL
(2021)
Article
Mathematics
Maria Anguiano, Francisco J. Suarez-Grau
Summary: This paper investigates the modeling of Newtonian fluids behavior through thin porous media. Based on the relation between the thickness and the size of the media, the study divides it into three different regimes, and finds that the lower-dimensional Darcy law is still valid when the Reynolds number is smaller or equal to the critical Reynolds number.
BULLETIN OF THE MALAYSIAN MATHEMATICAL SCIENCES SOCIETY
(2023)
Article
Mathematics
Ercan Erturk, Tofigh Allahviranloo
Summary: This paper studies the bifurcations in the solution of the driven semi-elliptical cavity flow, and presents multiple solutions within a specific aspect ratio range. The bifurcation Reynolds numbers for different aspect ratios and multiple solutions at different Reynolds numbers are presented in detail.
Article
Energy & Fuels
Embarek Douroum, Samir Laouedj, Amar Kouadri, Toufik Tayeb Naas, Sofiane Khelladi, Abdelylah Benazza
Summary: Efficient micromixers are widely used in various industrial applications for enhancing mixing efficiency. This study focuses on numerically investigating the impact of micromixer geometry on hydrodynamic and thermal mixing performances using different configurations. The results demonstrate that the proposed micromixer outperforms others in terms of mixing efficiency and energy cost at low Reynolds numbers.
CHEMICAL ENGINEERING AND PROCESSING-PROCESS INTENSIFICATION
(2021)
Article
Mechanics
Qiao Zhang, Chuanqiang Gao, Fangqi Zhou, Dangguo Yang, Weiwei Zhang
Summary: This study uses the Delayed-Detached Eddy Simulation and Discrete Frequency Response method to analyze the flow field and sound propagation law in different transonic buffeting states. It is found that low-frequency and small-amplitude shock oscillation in light buffeting states do not trigger large separated flow, while deep buffeting states produce high-frequency and large-amplitude shock oscillations resulting in large separated bubbles. Collisions between upstream traveling waves and shock wave oscillations increase the frequency and sound pressure levels of the shock waves. The main sound sources in this process are shock oscillations and the von Karman mode.
Article
Mathematics, Applied
Wenju Zhao
Summary: This article introduces a high order weak Galerkin method for solving Navier-Stokes equations with large Reynolds numbers, demonstrating its efficiency and robustness through numerical testing. Comparisons of different weak Galerkin techniques were performed on benchmark tests such as the Taylor-Green vortex flow, lid-driven flow, and flow around a cylinder.
NUMERICAL METHODS FOR PARTIAL DIFFERENTIAL EQUATIONS
(2022)
Article
Thermodynamics
Shu Zhu, Yaohui Fang, Yao Chen, Peiwen Yu, Yu Han, Nan Xiang, Zhonghua Ni
Summary: Fast and efficient micromixing of different species is crucial in many fields. However, most previous micromixers can only achieve well mixing effects in a narrow Reynold number (Re) range, and the 3D micromixers for improved mixing efficiency are difficult to fabricate. To overcome these limitations, a modular designed micromixer is proposed, which can achieve efficient mixing over a wide Re range.
INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER
(2022)
Article
Engineering, Mechanical
W. L. N. Buglie, K. F. Tamrin
Summary: The proposed cylindrical magneto-hydrodynamic (MHD) micromixer combines the characteristics of passive and active micromixers, utilizing the pumping capability of the MHD principle to enhance mixing performance. Experimental results show that the mixing efficiency increases linearly with the supplied electrical potential within a certain range of flow rates. This micromixer offers strong control, using inexpensive materials and a simple design.
PROCEEDINGS OF THE INSTITUTION OF MECHANICAL ENGINEERS PART E-JOURNAL OF PROCESS MECHANICAL ENGINEERING
(2022)
Article
Biochemistry & Molecular Biology
Zaira Rehman, Ishrat Jabeen, Ammad Fahim, Attya Bhatti, Peter John
Summary: A ligand-based pharmacophore model was developed to identify potential HIF-1α and β dimerization inhibitors, resulting in the identification of six hits with potential anti-cancer chemotherapy activity. These compounds could serve as potential inhibitors of HIF-1 dimerization after further structure optimization.
JOURNAL OF BIOMOLECULAR STRUCTURE & DYNAMICS
(2022)
Article
Energy & Fuels
Ji-Hyun Oh, Tien-Dung Vuong, Kwang-Yong Kim
Summary: This work conducted a design optimization study to improve the performance of a membraneless microfluidic fuel cell with a double-bridge cross-section of the flow channel. The governing equations were solved numerically to analyze the electrochemical phenomena and evaluate the performance of the fuel cells. Optimization was performed using a genetic algorithm combined with a surrogate model to maximize the peak power density. The optimal design showed a 57.6% increase in peak power density compared to the reference design.
Article
Energy & Fuels
Tien-Dung Vuong, Kwang-Yong Kim
Summary: This study investigated the effects of a dual-bleeding port recirculation channel on the aerodynamic performance of a single-stage transonic axial compressor and optimized its configuration to enhance operating stability. The addition of the bleeding channel increased its stabilizing effect compared to a single-bleeding channel. Optimization resulted in a 51.36% increase in stall margin with only slight reductions in peak adiabatic efficiency and maximum pressure ratio.
Article
Plant Sciences
Snehlata Saini, Afroz Alam, Sharad Vats
Summary: This study found that nine bryophytes collected from Mount Abu, Rajasthan, India, have significant total flavonoid and phenolic contents, indicating potential antioxidant activity.
Article
Engineering, Mechanical
Nam-Hun Kim, Kwang-Yong Kim
Summary: This study proposes a novel fluidic oscillator shape with a tapered outlet and numerically evaluates its performance parameters. The results show that the tapered outlet improves the overall performance of the fluidic oscillator without a significant increase in pressure drop.
TRANSACTIONS OF THE KOREAN SOCIETY OF MECHANICAL ENGINEERS B
(2022)
Article
Thermodynamics
Hyeon-Seok Shim, Kwang-Yong Kim
Summary: The study investigates the effects of the number of blades on the impeller-volute interaction and flow instability in a centrifugal pump. Numerical simulations and experimental data are used to analyze the fluctuations in performance parameters and local pressure caused by different blade numbers.
PROCEEDINGS OF THE INSTITUTION OF MECHANICAL ENGINEERS PART A-JOURNAL OF POWER AND ENERGY
(2022)
Article
Engineering, Mechanical
Ji-Hyun Oh, Tien-Dung Vuong, Kwang-Yong Kim
Summary: In this study, design optimization was performed to improve the performance of a membraneless microfluidic fuel cell. The optimal shape demonstrated a peak power density that was 252% higher than that of the reference shape.
TRANSACTIONS OF THE KOREAN SOCIETY OF MECHANICAL ENGINEERS B
(2022)
Article
Chemistry, Analytical
Naas Toufik Tayeb, Shakhawat Hossain, Abid Hossain Khan, Telha Mostefa, Kwang-Yong Kim
Summary: This study conducted three-dimensional numerical investigations of a novel passive micromixer to analyze the hydrodynamic and thermal behaviors of Nano-Non-Newtonian fluids. The research found that for high nanofluid concentrations, a strong chaotic flow significantly enhances the hydrodynamic and thermal performances at all Reynolds numbers. The proposed micromixer showed comparable mixing energy cost to a recent micromixer in terms of fluid homogenization.
Article
Plant Sciences
Aditi Sahariya, Chellapilla Bharadwaj, Iwuala Emmanuel, Afroz Alam
Summary: This study investigated the FT-IR expression analysis of two selected cultivars of Hordeum vulgare under fluoride stress and identified a cultivar with higher tolerance. The results showed that RD2786 had higher total tannin, chlorophyll, and antioxidant activities compared to RD2794, making it a suitable choice for cultivation in fluoride-affected regions.
PLANT PHYSIOLOGY REPORTS
(2022)
Article
Agronomy
Shivangi Pandey, Saumya Pandey, Afroz Alam
Summary: This study focuses on the isolation, characterization, and identification of bacterial isolates from bryophytes collected from Mount Abu, Rajasthan. The results show that the endophytic bacterial communities associated with the bryophytes differ based on geographical location.
Article
Thermodynamics
Ashutosh Kumar Jaiswal, Arshad Afzal
Summary: A multi-objective shape optimization of truncated prismatic ribs in a rectangular channel was performed to simultaneously optimize heat transfer and pressure loss. Numerical analysis was done using Reynolds-averaged Navier-Stokes equations with turbulence closure models. Design variables related to prismatic ribs were selected based on literature survey and parametric analysis. The optimization framework resulted in Pareto-optimal front designs with one design showing a relative thermal performance enhancement of 168.60% compared to the reference design.
INTERNATIONAL JOURNAL OF THERMAL SCIENCES
(2023)
Article
Environmental Sciences
S. Pandey, A. Alam
Summary: The aim of this study was to isolate endophytic bacterial community associated with bryophytes collected from different locations in Mount Abu, Rajasthan and to characterize their morphological, biochemical, and biofilm development properties. The isolates were classified into two phyla groups, Firmicutes and gamma-proteobacteria, with predominance of Firmicutes. Scanning electron microscopy confirmed the formation of biofilm by the bacterial isolates on glass surfaces and the production of significant amount of IAA, which is essential for the growth and development of bryophytes. This study highlights the associated bacterial diversity of bryophytes and provides insights into the morphological and biochemical characterization of the bacteria.
JOURNAL OF ENVIRONMENTAL BIOLOGY
(2023)
Article
Plant Sciences
Supriya Joshi, Emmanuel Iwuala, Afroz Alam
Summary: The current research aims to investigate the phytochemicals of Barbula indica in different solvents and its antioxidant properties. High-performance thin-layer chromatography (HPTLC) was used to quantify the caffeine content in a methanolic extract. The results showed that the methanolic extract had a higher total alkaloid content and exhibited antioxidant properties.
PLANT SCIENCE TODAY
(2023)
Meeting Abstract
Oncology
Neha Bahadur Merchant, Santosh Kumar Behera, Afroz Alam, Ganji Purnachandra Nagaraju, Riyaz Basha
Meeting Abstract
Oncology
Neha Bahadur Merchant, Santosh Kumar Behera, Afroz Alam, Ganji Purnachandra Nagaraju, Riyaz Basha
Article
Engineering, Chemical
Andrea Coletto, Pietro Poesio
Summary: Experiments and simulations were conducted to study the air volume fraction and hold-up in a bubble channel reactor. A new signal processing method was proposed to avoid the loss of bubble residence time. The results were in agreement with previous studies and a bubble-scale model was developed to explain the relationship between hold-up and air superficial velocity.
CHEMICAL ENGINEERING RESEARCH & DESIGN
(2024)
