Shengxian Xu, Jinglan Wang, Shaobo Liu, Feng Zhao, Hongying Xia, Yibo Wang,
... heterocyclic carbene (NHC) copper(I) complexes, [Cu(Ph-BenIm-Py)(POP)]PF6 (1), [Cu(Naph-BenIm-Py)(POP)]PF6 (2), and [Cu(Anthr-BenIm-Py)(POP)]PF6 (3) (Ph-BenIm-Py = 3-benzyl-1-(pyridin-2-yl)-1H-benzimidazolylidene, Naph-BenIm-Py = 3-(naphthalen-2-yl-1-(pyridin-2-yl)-1H- benzimidazolylidene, Anthr-BenIm-Py = 3-(anthracen-9-yl)-1-(pyridin-2- ...
Tópico(s): Catalytic C–H Functionalization Methods
2017 - Elsevier BV | Journal of Molecular Structure
Shaobo Liu, Shengxian Xu, Jinglan Wang, Feng Zhao, Hongying Xia, Yi‐Bo Wang,
... Cu(Py-Im)(POP)](PF6) (P1), [Cu(Py-BenIm)(POP)](PF6) (P2), and [Cu(Py-c-BenIm)(POP)](PF6) (P3) (Py-Im = 3-methyl-1-(pyridin-2-yl)-1H-imidazolylidene, Py-BenIm = 3-methyl-1-(pyridin-2-yl)-1H-benzo[d]imidazolylidene, Py-c-BenIm = 3-methyl-1-(pyridin-2-ylmethyl)-1H-benzo[ ...
Tópico(s): Catalytic C–H Functionalization Methods
2016 - Taylor & Francis | Journal of Coordination Chemistry
Jinglan Wang, Hongyun Chen, Shengxian Xu, Qingzhi Su, Feng Zhao, Haifeng He,
... heterocyclic carbene (NHC) copper(I) complexes, [Cu(Ph-BenIm-methylPy)(POP)]PF6 (1), and [Cu(Ph-Im-methylPy)(POP)]PF6 (2) Ph-BenIm-methylPy = 3-benzyl-1-(6-methyl-pyridin-2- ...
Tópico(s): Catalytic Cross-Coupling Reactions
2019 - Elsevier BV | Journal of Photochemistry and Photobiology A Chemistry
... 1837, dois navios negreiros foram capturados no rio Benim (Nigéria) com documentos de uma feitoria do tráfico ... as negociações da feitoria na bacia do rio Benim. Várias cartas dos empregados também foram encontradas, entre ... outros detalhes das operações da feitoria no rio Benim, em que os empregados estavam em contato com ... e com o Obá do poderoso reino do Benim.</p><p class="abstract"><strong><span>Palavras-chave</span></strong><span>: feitoria do tráfico - Osemwede - rio Benim - Azevedinho - Pernambuco.</span></p>
Tópico(s): African history and culture studies
2016 - UNIVERSIDADE FEDERAL DA BAHIA | Afro-Ásia
Merzoug Abdelghani, Mouslim Bara, Moussa Houhamdi,
... metais šiaurės rytinėje Alžyro dalyje, Garaet HadjTahar, Garaet BeniM'hamed ir Garaet El Haoues šlapynėse, priklausančiose Guerbes- ... mėnesį: 1710 individų Garaet HadjTahar, 89 individai Garaet BeniM'hamed ir 15 individų Garaet El Haoues šlapynėje. ...
Tópico(s): Species Distribution and Climate Change
2015 - Taylor & Francis | Zoology and Ecology
Nirmalendu Biswas, Dipak Kumar Mandal, Nirmal K. Manna, Ali Cemal Benim,
The present study investigates the use of a stair-shaped ground surface of a chimney-based solar thermal power plant (SCPP). The stair-shaped absorber is implemented to augment the efficacy of SCPP. The current investigation is conducted with a finite volume method-based solver, considering turbulent flow and solar irradiation models. Thermo-hydraulic performance, power generation, and irreversibility production of the plant are analyzed for different dimensions of the stair-shaped absorber. The ...
Tópico(s): Solar Thermal and Photovoltaic Systems
2023 - Elsevier BV | Applied Thermal Engineering
Dipak Kumar Mandal, Nirmalendu Biswas, Nirmal K. Manna, Ali Cemal Benim,
A numerical study is carried out meticulously to scrutinize the impact of different shapes of chimneys like circular (outer dia, dc), convergent (outer dia, 0.5dc), divergent (outer dia, 1.5dc), sudden contraction (outer dia, 0.5dc), and sudden expansion (outer dia, 1.5dc) on the performance of an SCPP. Furthermore, the parametric impact with different chimney divergence angles (CDA, ϕ), and ground absorber slope angle (GSA, γ) on the SCPP performance is also scrutinized. Optimum divergence angle (ϕ=+0. ...
Tópico(s): Innovative Energy Harvesting Technologies
2023 - Elsevier BV | Ain Shams Engineering Journal
Riheb Mabrouk, Hassane Naji, Ali Cemal Benim, Hacen Dhahri,
Sharing renewable energies, reducing energy consumption and optimizing energy management in an attempt to limit environmental problems (air pollution, global warming, acid rain, etc.) has today become a genuine concern of scientific engineering research. Furthermore, with the drastic growth of requirements in building and industrial worldwide sectors, the need for proper techniques that allow enhancement in the thermal performance of systems is increasingly being addressed. It is worth noting that ...
Tópico(s): Adsorption and Cooling Systems
2022 - Multidisciplinary Digital Publishing Institute | Applied Sciences
Nirmalendu Biswas, Dipak Kumar Mandal, Nirmal K. Manna, Ali Cemal Benim,
Abstract Bioconvective heat and mass transport phenomena have recently been the subject of interest in diverse fields of applications pertaining to the motion of fluids and their thermophysical properties. The transport processes in a system involving triple convective phenomena, irregular geometry, and boundary conditions constitute a complex phenomenon. This work aims to explore the mixed thermo-bioconvection of magnetically susceptible fluid containing copper nanoparticles and oxytactic bacteria ...
Tópico(s): Solar-Powered Water Purification Methods
2022 - Nature Portfolio | Scientific Reports
Nirmalendu Biswas, Dipak Kumar Mandal, Nirmal K. Manna, Ali Cemal Benim,
In many industries as well as medical science, process intensification dealing with proper mixing is dictated by the thermo-fluidic transport process, and mass transfer rate. Modeling as well as controlling such a device/system comprising multiphysical consequences and multifaceted geometries is a rather challenging task. In this exercise, an effort has been taken to explore the bioconvective heat and mass transfer phenomena of Cu-water nanofluid with the suspension of motile oxytactic microorganisms ...
Tópico(s): Lattice Boltzmann Simulation Studies
2022 - Elsevier BV | Energy
Björn Pfeiffelmann, Ali Cemal Benim, Franz Joos,
Thermoelectric generators (TEGs) have the ability to convert waste heat into electrical energy under unfavorable conditions and are becoming increasingly popular in academia, but have not yet achieved a broad commercial success, due to the still comparably low efficiency. To increase the efficiency and economic viability of TEGs, research is performed on the materials on one hand and on the system connection on the other. In the latter case, the net output power of the cooling system plays a key ...
Tópico(s): Advanced Thermodynamics and Statistical Mechanics
2021 - Multidisciplinary Digital Publishing Institute | Energies
Ali Cemal Benim, Cansu Deniz Canal, Y. Erhan Böke,
Swirling pulverized coal and biomass flames are computationally investigated for oxy-combustion. The two-phase flow is described by a Eulerian-Eulerian approach. For radiation, the absorption coefficient is approximated by superposing particle and gas contributions, considering oxy-combustion conditions for the latter. Turbulence is modelled within a URANS framework, using the standard k-ε model and Reynolds Stress Model (RSM). It is observed that RSM captures the unsteady dynamics of the coherent ...
Tópico(s): Fire dynamics and safety research
2021 - Elsevier BV | Energy
Anıl Başaran, Ali Cemal Benim, Ali Yurddaş,
A numerical investigation of the condensing flow of isobutane inside microchannel has been performed. Impact of mass flux, hydraulic diameter, and vapor quality on the heat transfer rate and pressure drop is determined. To this purpose, steady-state numerical simulations of condensation flow of isobutane have been performed at mass fluxes ranging from 200 to 600 kg/m2s inside a single circular microchannel with varying diameter. Similar to the usual operation conditions, the simulations have been ...
Tópico(s): Refrigeration and Air Conditioning Technologies
2021 - Taylor & Francis | Heat Transfer Engineering
Ramzan Ali, Aamir Farooq, Azeem Shahzad, Ali Cemal Benim, Azhar Iqbal, Mudassar Razzaq,
This investigation is concerned with the heat transfer analysis in a realistic three-dimensional flow of a couple-stress fluid. Convective boundary conditions have been adopted in the mathematical formulation keeping in view the physical consequences and detail examination of corresponding parameters. The boundary layer analysis has been invoked for simplification of the highly nonlinear system of differential equations. Afterward the governing system of partial differential equations are transformed ...
Tópico(s): Fluid Dynamics and Turbulent Flows
2020 - Elsevier BV | Physica A Statistical Mechanics and its Applications
Nirmalendu Biswas, Nirmal K. Manna, Aparesh Datta, Dipak Kumar Mandal, Ali Cemal Benim,
The implementation of aspiration (without fans/pumps) of the working medium can significantly intensify heat transfer in low power magneto-hydrodynamic (MHD) thermal applications. To explore its effectiveness over no-aspiration condition, a classical thermal cavity with protruded-heater (centrally mounted at bottom) is considered along with magnetic fields. The aspiration openings are provided at the bottom of the sidewalls (for passive partial suction) and in the middle of the top wall (for partial ...
Tópico(s): Spacecraft and Cryogenic Technologies
2020 - Inderscience Publishers | Progress in Computational Fluid Dynamics An International Journal
Arindam Bit, Adel Alblawi, Himadri Chattopadhyay, Qurratul Ain Quais, Ali Cemal Benim, Mohammad Rahimi‐Gorji, Hoang-Thinh Do,
Mortality rate increases globally among which one third is due to diseased blood vessels. Due to late diagnoses of the disease in vessels (severe stenoses), qualitative and rapid assessment becomes difficult. Earlier assessment of stenoses can lead to formulation of effective treatment protocol. It is often found that proliferation of secondary stenoses at downstream of a stenosed vessel depends on the degree of severity of primary stenoses. Numerical investigation of flow dynamics of blood in such ...
Tópico(s): Cardiovascular Health and Disease Prevention
2019 - Elsevier BV | Computer Methods and Programs in Biomedicine
Suvanjan Bhattacharyya, Ali Cemal Benim, Manabendra Pathak, Sunil Chamoli, Ashutosh Gupta,
Tópico(s): Fluid Dynamics and Turbulent Flows
2019 - Springer Science+Business Media | Journal of Thermal Analysis and Calorimetry
Ali Cemal Benim, Björn Pfeiffelmann, Paweł Ocłoń, Jan Taler,
A numerical analysis of an atmospheric, subsonic, turbulent lifted H2/N2 jet flame in vitiated co-flow is presented. Turbulence is treated by a Large Eddy Simulation (LES) methodology. As the turbulent combustion model, the Flamelet Generated Manifold (FGM) approach is used, which enables the incorporation of detailed chemistry via two additional scalar field variables. The results are compared with the measurements and with the predictions of other authors. It is observed that the achieved predictive ...
Tópico(s): Computational Fluid Dynamics and Aerodynamics
2019 - Elsevier BV | Energy
Suvanjan Bhattacharyya, Ali Cemal Benim, Himadri Chattopadhyay, Arnab Banerjee,
In the present paper, along with experimental study, CFD analysis of forced convection in a twisted tube is performed, using the transition SST model which can predict the change of flow regime from laminar through transition to turbulent. The differential governing equations are discretized by the finite volume method. The investigations are conducted for Reynolds numbers ranging from 100 to 50000 covering laminar, transitional and turbulent regimes, and for three length and three pitch ratios. ...
Tópico(s): Heat Transfer Mechanisms
2019 - Vinča Institute of Nuclear Sciences | Thermal Science
Ali Cemal Benim, Michael Diederich, Fethi Gül, Paweł Ocłoń, Jan Taler,
Aerodynamics and aeroacoustics of a small horizontal axis wind turbine are investigated experimentally and computationally. The purpose has been to develop a procedure to predict and optimize the aerodynamic and aeroacoustic performance of such turbines. Aeroacoustic measurements are performed by an acoustic camera, while monitoring the plant’s power output. In the computational analysis, an unsteady, 3D analysis is applied, modelling the turbulence by the Improved Delayed Detached Eddy Simulation ( ...
Tópico(s): Wind and Air Flow Studies
2018 - Elsevier BV | Energy Conversion and Management
Asma Farooq, Ramzan Ali, Ali Cemal Benim,
In this article, a realistic three dimensional magnetohydrodynamic flow of an Oldroyd-B fluid is studied after developing a convergent analytic scheme. Soret and Dufour effects with mixed convection are taken into account. The governing highly non-linear partial differential equations are transformed into the system of ordinary differential equations using similarity transformations. The resulting problems are computed by homotopy analysis method (HAM). Profiles of dimensionless velocities, temperature ...
Tópico(s): Rheology and Fluid Dynamics Studies
2018 - Elsevier BV | Physica A Statistical Mechanics and its Applications
Suvanjan Bhattacharyya, Ali Cemal Benim, Himadri Chattopadhyay, Arnab Banerjee,
Turbulent forced convection in a corrugated tube with spring tape is investigated experimentally, for Reynolds numbers from 10,000 to 50,000. The working fluid is air. Experiments are performed for different pitch and spring ratios. Results show that Nusselt numbers can be increased considerably, depending on pitch and spring ratios. An overall assessment, considering the friction losses, is achieved using the thermo-hydraulic performance parameter. The latter is observed to take values larger than ...
Tópico(s): Fluid Dynamics and Turbulent Flows
2018 - Taylor & Francis | Experimental Heat Transfer
Suvanjan Bhattacharyya, Himadri Chattopadhyay, Anindya Guin, Ali Cemal Benim,
In the present study, the effect of forward inclined turbulators on the heat transfer enhancement in a duct is investigated, for forced convection. Turbulator configurations with three different pitch ratios and three different inclination angles are investigated for seven Reynolds numbers within the range 500–50,000. Investigations are performed experimentally as well as computationally, within a computational fluid dynamics framework. A distinguishing feature of the latter has been the employment ...
Tópico(s): Aerodynamics and Fluid Dynamics Research
2018 - Taylor & Francis | Heat Transfer Engineering
Ali Cemal Benim, Michael Diederich, Björn Pfeiffelmann,
The purpose of this study is the development of an automated two-dimensional airfoil shape optimization procedure for small horizontal axis wind turbines (HAWT), with an emphasis on high thrust and aerodynamically stable performance. The procedure combines the Computational Fluid Dynamics (CFD) analysis with the Response Surface Methodology (RSM), the Biobjective Mesh Adaptive Direct Search (BiMADS) optimization algorithm and an automatic geometry and mesh generation tool. In CFD analysis, a Reynolds ...
Tópico(s): Advanced Multi-Objective Optimization Algorithms
2018 - Multidisciplinary Digital Publishing Institute | Computation
Björn Pfeiffelmann, Ali Cemal Benim, Franz Joos,
The electric power produced by a thermoelectric generator (TEG) is strongly influenced by the applied heat sink. While a TEG is aimed at harvesting waste heat, the optimization of the efficiency of the heat sink is a key task for the design of waste heat recovery systems implementing TEG. A TEG model is proposed and implemented in an open source toolbox for field operation and manipulation (OpenFOAM) for the purpose of performing optimizations of the heat sink, using a commercially available TEG as ...
Tópico(s): Advanced Thermodynamics and Statistical Mechanics
2018 - Taylor & Francis | Heat Transfer Engineering
Ali Cemal Benim, Suvanjan Bhattacharyya, Himadri Chattopadhyay,
This paper encapsulates results of a numerical investigation on flow and heat transfer of an incompressible medium with constant properties through an isothermal circular tube with alternating inclined ribs. Simulations are conducted for laminar, transitional, and turbulent flow regimes. As turbulence model, the transitional shear stress transport model is employed. The problem is investigated for four rib angle of attack values, as well as for a plain tube without any ribs. All configurations are ...
Tópico(s): Heat Transfer and Optimization
2017 - Inderscience Publishers | Progress in Computational Fluid Dynamics An International Journal
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Tópico(s): Educational Leadership and Administration
2017 - | Necatibey Eğitim Fakültesi Elektronik Fen ve Matematik Eğitimi Dergisi
Suvanjan Bhattacharyya, Himadri Chattopadhyay, Ali Cemal Benim,
Heat transfer behaviour in a tube with inserted twisted tape swirl generator is investigated numerically, for different values of the twist ratio and diameter ratio and for Reynolds numbers within the range 100-20,000. The transition-SST model is used as the turbulence model. The computational model is validated, first, on a plain tube, where a good agreement is achieved with the correlations. The subsequent analysis of the tube with twisted tape indicates that the use of twist tape enhances heat ...
Tópico(s): Nanofluid Flow and Heat Transfer
2017 - Inderscience Publishers | Progress in Computational Fluid Dynamics An International Journal
Montasser S. Tahat, Ali Cemal Benim,
Hybrid nanofluid is the new generation of heat transfer fluid for various heat transfer applications where transport characteristics are substantially higher than the base liquid. The study presents an experimental investigation of rheological and thermophysical properties of Al 2 O 3 / CuO hybrid nanoparticles suspended in 25:75 (by weight) ethylene glycol and water mixture. This manuscript presents experimental work of thermophysical properties of Al 2 O 3 /CuO/water/ethylene glycol hybrid nanofluids ...
Tópico(s): Heat Transfer Mechanisms
2017 - Trans Tech Publications | Defect and diffusion forum/Diffusion and defect data, solid state data. Part A, Defect and diffusion forum
Suvanjan Bhattacharyya, Himadri Chattopadhyay, Ali Cemal Benim,
This paper encapsulates results of a numerical investigation on flow and heat transfer of an incompressible medium with constant properties through an isothermal circular tube with alternating inclined ribs. Simulations are conducted for laminar, transitional, and turbulent flow regimes. As turbulence model, the transitional shear stress transport model is employed. The problem is investigated for four rib angle of attack values, as well as for a plain tube without any ribs. All configurations are ...
Tópico(s): Heat Transfer and Optimization
2017 - Inderscience Publishers | Progress in Computational Fluid Dynamics An International Journal