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  • Open Access

    ARTICLE

    Numerical Investigation of the Temperature and Flow Fields in a Solar Chimney Power Plant

    Roudouane Laouar1,*, Olaf Wünsch2

    FDMP-Fluid Dynamics & Materials Processing, Vol.19, No.4, pp. 1055-1066, 2023, DOI:10.32604/fdmp.2022.022677

    Abstract In this work, a parametric two-dimensional computational fluid dynamics (CFD) analysis of a solar chimney power plant (a prototype located in Manzanares, Spain) is presented to illustrate the effects of the solar radiation mode in the collector on the plant performances. The simulations rely on a mathematical model that includes solar radiation within the collector; energy storage; air flow and heat transfer, and a turbine. It is based on the Navier-Stokes equation for turbulent flow formulated according to the standard k-ε model. Moreover, the Boussinesq approach is used to account for the fluid density variations. Different solar radiation modes in… More >

  • Open Access

    ARTICLE

    Bending and Free Vibration Analysis of Porous-Functionally-Graded (PFG) Beams Resting on Elastic Foundations

    Lazreg Hadji1,2,*, Fabrice Bernard3, Nafissa Zouatnia4

    FDMP-Fluid Dynamics & Materials Processing, Vol.19, No.4, pp. 1043-1054, 2023, DOI:10.32604/fdmp.2022.022327

    Abstract The bending and free vibration of porous functionally graded (PFG) beams resting on elastic foundations are analyzed. The material features of the PFG beam are assumed to vary continuously through the thickness according to the volume fraction of components. The foundation medium is also considered to be linear, homogeneous, and isotropic, and modeled using the Winkler-Pasternak law. The hyperbolic shear deformation theory is applied for the kinematic relations, and the equations of motion are obtained using the Hamilton’s principle. An analytical solution is presented accordingly, assuming that the PFG beam is simply supported. Comparisons with the open literature are implemented… More > Graphic Abstract

    Bending and Free Vibration Analysis of Porous-Functionally-Graded (PFG) Beams Resting on Elastic Foundations

  • Open Access

    ARTICLE

    Investigation of the Effects of a Large Percentage of Dried Sludge on the Operation of a Coal-Fired Boiler

    Jialin Tong1,2, Yan Zhang2, Ruikang Wu1, Xiaojuan Qi1, Xuemin Ye2,*

    FDMP-Fluid Dynamics & Materials Processing, Vol.19, No.4, pp. 1027-1041, 2023, DOI:10.32604/fdmp.2022.022303

    Abstract A 600 MW coal-fired boiler with a four-corner tangential combustion mode is considered here to study the combustion features and pollutant emissions at different loads for large-percentages of blending dried sludges. The influence of the over-fired air (OFA) coefficient is examined and the impact of the blending ratio on the boiler operation is explored. The results show that for low blending ratios, a slight increase in the blending ratio can improve the combustion of bituminite, whereas a further increase leads to the deterioration of the combustion of blended fuels and thus reduces the boiler efficiency. Enhancing the supporting capability of the… More > Graphic Abstract

    Investigation of the Effects of a Large Percentage of Dried Sludge on the Operation of a Coal-Fired Boiler

  • Open Access

    ARTICLE

    Performance of a Solar-Biomass Adsorption Chiller

    Najeh Ghilen1,3,*, Mohammed El Ganaoui3, Slimane Gabsi1,2, Riad Benelmir3

    FDMP-Fluid Dynamics & Materials Processing, Vol.19, No.4, pp. 1015-1026, 2023, DOI:10.32604/fdmp.2022.022285

    Abstract A dynamic model is presented for a chiller working with a composite adsorbent (silica activated carbon/CaCl2)–water pair in a solar-biomass cooling installation. The main objective is determining a link between two possible evaporator configurations and the refrigerator’s performances. The two considered evaporators work at different pressure levels. The related time evolution profiles of temperature, pressure and water content are studied. Moreover, the effects of hot water inlet temperature and cooling water inlet temperature on the specific cooling capacity (SCP) and coefficient of performance (COP) are predicted by means of numerical simulations. The results show that an increase in the temperature… More >

  • Open Access

    ARTICLE

    Optimal Structural Parameters for a Plastic Centrifugal Pump Inducer

    Wenbin Luo1,*, Lingfeng Tang1, Yuting Yan2, Yifang Shi1

    FDMP-Fluid Dynamics & Materials Processing, Vol.19, No.4, pp. 869-899, 2023, DOI:10.32604/fdmp.2022.022280

    Abstract The aim of the study is to determine the optimal structural parameters for a plastic centrifugal pump inducer within the framework of an orthogonal experimental method. For this purpose, a numerical study of the related flow field is performed using CFX. The shaft power and the head of the pump are taken as the evaluation indicators. Accordingly, the examined variables are the thickness (S), the blade cascade degree (t), the blade rim angle (β1), the blade hub angle (β2) and the hub length (L). The impact of each structural parameter on each evaluation index is examined and special attention is… More >

  • Open Access

    ARTICLE

    Analysis of the Emissions and Performance of a Diesel Engine Using Pumpkin Seed Oil Methyl Ester with Different Injection Pressures

    Surendrababu Kuppusamy1,*, Prabhahar Muthuswamy2, Muthurajan Kumarasamy3, Sendilvelan Subramanian4

    FDMP-Fluid Dynamics & Materials Processing, Vol.19, No.4, pp. 1003-1014, 2023, DOI:10.32604/fdmp.2022.022262

    Abstract Biodiesel fuel is a potential alternative energy source for diesel engines due to its physiochemical characteristics relatively similar to those of traditional diesel fuel. In this study, the performance, emission, and combustion features of a mono cylinder DI diesel engine are assessed using 20% Pumpkin seed methyl ester (PSOME20) and considering varying injection pressures (200, 220, 240, and 260 bar). The considered Pumpkin seed oil is converted into pumpkin biodiesel by transesterification and then used as fuel. The findings demonstrate that the Brake Thermal Efficiency (BTE) of PSOME20 can be raised by 1.68%, and the carbon monoxide (CO), hydrocarbon (HC),… More > Graphic Abstract

    Analysis of the Emissions and Performance of a Diesel Engine Using Pumpkin Seed Oil Methyl Ester with Different Injection Pressures

  • Open Access

    ARTICLE

    Exergo-Environmental Study of a Recent Organic Solar Hybrid Heat Pump

    Rabeb Toujani, Nahla Bouaziz*

    FDMP-Fluid Dynamics & Materials Processing, Vol.19, No.4, pp. 991-1001, 2023, DOI:10.32604/fdmp.2022.022239

    Abstract A hybrid heat pump (compression/absorption) with an integrated thermal photovoltaic unit is studied. The considered working fluids are organic mixtures: R245fa/DMAC and R236fa/DMAC, chosen for their low Global Warming Potential. The main objective is the optimization of energy efficiency in order to minimize the environmental impact through the implementation of a sustainable strategy. It is shown that Exergy Analysis itself is a valuable tool in energy integration. Within the imposed framework of minimizing total annual costs, entropy analysis can be instrumental in determining the optimal plant concept, optimizing energy conversion and use, and improving profitability. The present results are discussed… More >

  • Open Access

    ARTICLE

    Unsteady Heat Transfer in Bilayer, and Three-Layer Materials

    Toufik Sahabi1,*, Smain Balaska2

    FDMP-Fluid Dynamics & Materials Processing, Vol.19, No.4, pp. 977-990, 2023, DOI:10.32604/fdmp.2022.022059

    Abstract The heat transfer equation is used to determine the heat flow by conduction through a composite material along the real axis. An analytical dimensionless analysis is implemented in the framework of a separation of variables method (SVM). This approach leads to an Eigenvalues problem that is solved by the Newton’s method. Two types of dynamics are found: An unsteady condition (in the form of jumps or drops in temperatures depending on the considered case), and a permanent equilibrium (tending to the ambient temperature). The validity and effectiveness of the proposed approach for any number of adjacent layers is also discussed.… More > Graphic Abstract

    Unsteady Heat Transfer in Bilayer, and Three-Layer Materials

  • Open Access

    ARTICLE

    Numerical Study on the Combined Use of Corten Steel and Phase Change Materials in Container-Type Houses

    Feriel Mustapha1,2,*, Marwa El Yassi1,2, Ikram El Abbassi1,2, Abdelhak Kaci2, Elhadj Kadri2, A-Moumen Darcherif3

    FDMP-Fluid Dynamics & Materials Processing, Vol.19, No.4, pp. 953-958, 2023, DOI:10.32604/fdmp.2022.022028

    Abstract A study is presented on the feasibility of an approach based on the combination of Phase Change Materials (PCM) with metal walls in container-type houses. This line of research finds its motivations in recent trends in the energy and building sectors about energy consumption reduction. Another important objective concerns possible improvements in the comfort provided by such houses during the summer period. The results obtained through numerical solution of the governing equations accounting for heat transfer and latent heat effects associated with the PCM show that the indoor temperature can be reduced with a varying degree of success depending on… More >

  • Open Access

    ARTICLE

    Impact of Radiation and Slip on Newtonian Liquid Flow Past a Porous Stretching/Shrinking Sheet in the Presence of Carbon Nanotubes

    U. S. Mahabaleshwar1, T. Anusha1,*, M. EL Ganaoui2, R. Bennacer3

    FDMP-Fluid Dynamics & Materials Processing, Vol.19, No.4, pp. 929-939, 2023, DOI:10.32604/fdmp.2022.021996

    Abstract The impacts of radiation, mass transpiration, and volume fraction of carbon nanotubes on the flow of a Newtonian fluid past a porous stretching/shrinking sheet are investigated. For this purpose, three types of base liquids are considered, namely, water, ethylene glycol and engine oil. Moreover, single and multi-wall carbon nanotubes are examined in the analysis. The overall physical problem is modeled using a system of highly nonlinear partial differential equations, which are then converted into highly nonlinear third order ordinary differential equations via a suitable similarity transformation. These equations are solved analytically along with the corresponding boundary conditions. It is found… More > Graphic Abstract

    Impact of Radiation and Slip on Newtonian Liquid Flow Past a Porous Stretching/Shrinking Sheet in the Presence of Carbon Nanotubes

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