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Numerical Investigation of Heat and Mass Transfer in Nanofluid-Filled Porous Medium
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作者 Dalel Helel Noureddine Boukadida 《Advances in Nanoparticles》 CAS 2024年第3期29-44,共16页
In this work, we numerically study the laminar mixed convection of fluid flow in a vertical channel filled with porous media during the drying process. The porous medium, modeled as a vertical wall, consists of solid ... In this work, we numerically study the laminar mixed convection of fluid flow in a vertical channel filled with porous media during the drying process. The porous medium, modeled as a vertical wall, consists of solid and nanofluid phase (Water-Al2O3 or Water-Cu), as well as a gas phase. The established model is developed based on Whitaker’s theory and resolved by our numerical code using Fortran. Results principally show the influence of various physical parameters, such as nanoparticle volume fraction, ambient temperature, and saturation on heat and mass transfer on the drying process. This study brings the effect of the presence of nanofluids in porous media. It contributes not only to our fundamental understanding of drying processes but also provides practical insights that can guide the development of more efficient and sustainable drying technologies. . 展开更多
关键词 Mixed Convection Heat Transfer NANOFLUID DRYING Porous Media
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DYNAMICS OF NEW CLASS OF HOPFIELD NEURAL NETWORKS WITH TIME-VARYING AND DISTRIBUTED DELAYS 被引量:3
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作者 Adnene ARBI Farouk CHERIF +1 位作者 Chaouki AOUITI Abderrahmen TOUATI 《Acta Mathematica Scientia》 SCIE CSCD 2016年第3期891-912,共22页
In this paper, we investigate the dynamics and the global exponential stability of a new class of Hopfield neural network with time-varying and distributed delays. In fact, the properties of norms and the contraction ... In this paper, we investigate the dynamics and the global exponential stability of a new class of Hopfield neural network with time-varying and distributed delays. In fact, the properties of norms and the contraction principle are adjusted to ensure the existence as well as the uniqueness of the pseudo almost periodic solution, which is also its derivative pseudo almost periodic. This results are without resorting to the theory of exponential dichotomy. Furthermore, by employing the suitable Lyapunov function, some delayindependent sufficient conditions are derived for exponential convergence. The main originality lies in the fact that spaces considered in this paper generalize the notion of periodicity and almost periodicity. Lastly, two examples are given to demonstrate the validity of the proposed theoretical results. 展开更多
关键词 delayed functional differential equations neural networks pseudo-almost peri- odic solution global exponential stability time-varying and distributed delays fixed point theorem
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Global Warming and Its Multiple Causes 被引量:1
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作者 Romdhane Ben Slama 《Journal of Atmospheric Science Research》 2020年第2期28-31,共4页
The global warming which preoccupies humanity,is still considered to be linked to a single cause which is the emission of greenhouse gases,CO2 in particular.In this article,we try to show that,on the one hand,the gree... The global warming which preoccupies humanity,is still considered to be linked to a single cause which is the emission of greenhouse gases,CO2 in particular.In this article,we try to show that,on the one hand,the greenhouse effect(the radiative imprisonment to use the scientific term)took place in conjunction with the infrared radiation emitted by the earth.The surplus of CO2 due to the combustion of fossil fuels,but also the surplus of infrared emissions from artificialized soils contribute together or each separately,to the imbalance of the natural greenhouse effect and the trend of global warming.In addition,another actor acting directly and instantaneously on the warming of the ambient air is the heat released by fossil fuels estimated at 17415.1010 kWh/year inducing a rise in temperature of 0.122°C,or 12.2°C/century. 展开更多
关键词 Greenhouse effect gases Global warming Infrared emission Heat of combustion
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Refrigerator Coupling to a Water-Heater and Heating Floor to Save Energy and to Reduce Carbon Emissions
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作者 Romdhane Ben Slama 《Computational Water, Energy, and Environmental Engineering》 2013年第1期21-29,共9页
With an aim of rationing use of energy, energy safety, and to reduce carbon emission, our interest was geared towards the refrigerators and all the refrigerating machines. Indeed the heat yielded by the exchanger cond... With an aim of rationing use of energy, energy safety, and to reduce carbon emission, our interest was geared towards the refrigerators and all the refrigerating machines. Indeed the heat yielded by the exchanger condenser can be developed for the water heating, floors heating etc. After an encouraging theoretical study, two prototypes were produced in order to validate the theoretical results. A first refrigerator was coupled with a water-heater and another with a heating floor. The water temperature reached, in one day, is of 60℃;which makes it possible to predict better results with a continuously used refrigerator. In the same way for the heating floor coupled with the second refrigerator, the temperature reached high values because the surface is reduced;however for the heating floors the standard fixes the temperature between 28℃ and 30℃. 展开更多
关键词 REFRIGERATOR RECUPERATOR HEATING WATER HEATING Floor Heat Pump
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Direct Adaptive Fuzzy Based Backstepping Control of Semi Strict Feedback Nonlinear Systems
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作者 Raoudha Ben Khaled Chaouki Mnasri Moncef Gasmi 《Computer Technology and Application》 2011年第11期884-892,共9页
In this paper, a direct adaptive fuzzy tracking control is proposed for a class of uncertain single-input single-output nonlinear semi-strict feedback systems. Based on Takagi-Sugeno type fuzzy systems, a direct adapt... In this paper, a direct adaptive fuzzy tracking control is proposed for a class of uncertain single-input single-output nonlinear semi-strict feedback systems. Based on Takagi-Sugeno type fuzzy systems, a direct adaptive fuzzy tracking controller is developed by using the backstepping approach. The main advantage of the developed method is that for an n-th order system, only one parameter is needed to be adjusted online. It is proven that, under the appropriate assumptions, the developed scheme can achieve that the output system converges to a small neighborhood of the reference signal and all the signals in the closed-loop system remain bounded. The efficacy of the proposed algorithm is investigated by an illustrative simulation example of one link robot. 展开更多
关键词 Direct adaptive fuzzy control perturbed nonlinear systems strict feedback form backstepping design output tracking
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Dual Anthropogenic Origin of Global Warming through GHGs and IR Radiation Emissions from Artificialized Soils
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作者 Romdhane Ben Slama 《Journal of Atmospheric Science Research》 2021年第4期36-41,共6页
This paper contributes to explain the global warming instead of"giving up"and thinking about passively adapting to climate change or global warming.It makes more sense to tackle what creates the greenhouse e... This paper contributes to explain the global warming instead of"giving up"and thinking about passively adapting to climate change or global warming.It makes more sense to tackle what creates the greenhouse effect and contributes to global warming.The greenhouse effect is not only due to GHGs emissions,but also to the excess IR radiation emitted during the day,by artificial surfaces,following the absorption of solar radiation.The phenomenon should be compared to that of radiative forcing well known by climatologists and which makes the link between atmospheric pollution and the density of heat fluxes stopped by the atmosphere inducing global warming.It becomes clear that type an equation here.The surplus CO2 and IR radiation emissions influence global warming,not to mention the direct part of the heat released by the combustion of fossil fuels and even renewable(wood fires,biogas,friction of wind turbine propellers with the air). 展开更多
关键词 Greenhouse gazes Global warming Infrared radiation emission Artificilised soils
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New results for a Lasota-Wazewska model
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作者 Farouk Cherif Mohsen Miraoui 《International Journal of Biomathematics》 SCIE 2019年第2期143-162,共20页
In nature there is no phenomenon that is purely periodic,and this gives the idea to consider the measure pseudo almost periodic oscillation.In this paper,by employing a suitable fixed point theorem,the proper ties of ... In nature there is no phenomenon that is purely periodic,and this gives the idea to consider the measure pseudo almost periodic oscillation.In this paper,by employing a suitable fixed point theorem,the proper ties of the measure pseudo almost periodic functions and differential inequality,we investigate the existence and uniqueness of the measure pseudo almost periodic solutions for some models of Lasota-Wazewska equation with measure pseudo almost periodic coefficients and mixed delays.We suppose that the linear part has almost periodic and the nonlinear part is assumed to be measure pseudo almost periodic.Moreover,the global attractivity and the exponential stability of the measure pseudo almost periodic solutions are also considered for the system.As application,an illustrative numerical example is given to demonstrate the effectiveness of the obtained results. 展开更多
关键词 LASOTA Wazewska model MEASURE PSEUDO ALMOST PERIODIC function fixed point THEOREM
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