Publications Internationales
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Item Convective heat transference of non-Newtonian functional phase variation nano-encapsulated liquids(World Scientific, 2023) Farooq H., Ali; Hameed K., Hamzah; Saba Y., Ahmed; Muneer A., Ismael; Haddad, Zoubida; Ghalambaz, Mohammad; Azher M., Abed; Al-Farhany, Khaled; Jamshed, Wasim; Eid, Mohamed R.Convective flowing and heat transference of non-Newtonian liquid comprising nano-encapsulated phase-changing material (NEPCM) suspensions, filled in a square cavity, is numerically investigated. The molecules of NEPCM are cored with n-octadecane, shelled by polymethyl-methacrylate, and suspended in non-Newtonian fluid. The enclosure is insulated horizontally and heated vertically. Finite element method (FEM) is implemented for the numerical solution under different variables such as nanoparticles volume fraction (0<<0.05), Stefan number (Ste=0.2,0.313,0.5), the heat capacity ratio (λ) of about (0.4), the temperature of fusion of the NEPCM (0<θf<1) and the density ratio (ρPρf) (0.7<ρPρf≤0.9). The results show that the Nusselt quantity is related to the fusion temperature. An improvement in heat transference is observed when the fusion temperature deviates from the wall temperature, which is in the range of 0.25<θf<0.75. For all power law index values (n), a linear increase of the Nusselt number with the solid volume fraction is detected. The shear-thinning nanofluid (n=0.6) demonstrates higher Nusselt number values than those of n=1 and 1.4Item Turbulent forced convective flow in a conical diffuser : hybrid and single nanofluids(Elsevier, 2023) Iachachene, Farida; Haddad, Zoubida; Arıcı, Müslüm; Jamei, Mehdi; Mataoui, AminaTurbulent forced convective flow of hybrid and single nanofluids in a conical diffuser is investigated numerically. Simulations are conducted for various Reynolds (Re=10000-70000) and different concentrations (ϕ=0-1.5 vol%) at equal ratio of TiO2:SiO2. The impact of using theoretical and experimental correlations for dynamic viscosity and thermal conductivity on turbulent forced convection of TiO2 showed that the mean Nusselt (Nu) number is considerably reduced with the use of the experimental model. However, when the theoretical model is used, Nu varies insignificantly. Addition of TiO2 nanoparticles decreases the heat transfer inside the diffuser, whereas addition of TiO2–SiO2 nanoparticles either enhances or decreases the heat transfer rate. Compared to the pure fluid, hybrid nanofluids show a maximum enhancement of 5% and a maximum decrease of 9.7% at ϕ= 0.5 vol% and ϕ= 0.5 vol% at Re=10000, respectively. However, TiO2 nanofluids show a maximum decrease of 19% at ϕ=1.5 vol% and Re= 30000. As Re increases, the deviations between TiO2 and SiO2-TiO2 nanofluids diminish. Moreover, the Gene Expression Programming model can accurately evaluate Nu versus Re number and nanoparticle concentrationItem Numerical investigation and optimization of melting performance for thermal energy storage system partially filled with metal foam layer: New design configurations(Elsevier, 2023) Haddad, Zoubida; Iachachene, Farida; Sheremet, Mikhail A.; ;Abu-Nada, EiyadLow thermal performance of storage systems represents a barrier to their industrial/engineering application and commercialization. Among all the proposed methods, combination of phase change material with metal foams appears more promising due to the high thermal conductivity of metal foams. However, the insertion of metal foams reduces the PCM volume; hence, a lower amount of stored energy. The present numerical study thoroughly addresses this issue with a focus on the optimization of melting performance for thermal energy storage system partially filled with metal foam layer. A finite volume method based on the enthalpy–porosity technique has been adopted for the numerical simulations. The metal foam location, porosity, and nanoparticle volume fraction were optimized to explore their effects on the melting performance. The results showed that inserting the foam layer diagonally from the top left to the right bottom leads to the lowest melting time. Compared to pure PCM, the melting time increases by 77.7%, while the stored energy decreases by 6.7%. The optimum porosity was found to be 0.88 as it gives approximately the same amount of stored energy as that of pure PCM with a deviation of 4%. Adding nanoparticles to pure PCM increases the melting rate by approximately 8%, while it decreases the stored energy by almost 3%. It is concluded that hybrid systems, i.e., metal foam at an optimum porosity and nanoparticles is more efficient than using each technique separatelyItem The effect of nano encapsulated phase change materials and nanoparticles on turbulent heat transport : a conical diffuser scenario(Elsevier, 2022) Iachachene, Farida; Haddad, Zoubida; Arıcı, Müslüm; Abu-Nada, Eiyad; Sheremet, Mikhail A.The present work investigates turbulent flow of single and hybrid nanofluids filled in a conical diffuser. The heat transfer coefficients and pressure losses are analyzed at various Reynolds numbers and nanoparticle volume fractions. The diffuser is filled with Al2O3, nano encapsulated phase change material NEPCM, and NEPCM_Al2O3 nanofluids. The thermophysical parameters of all nanofluids were determined using a novel methodology based on the thermodynamic equilibrium data for binary liquid mixtures. A notable novelty in the current work is the introduction of an innovative method of hybrid nanofluids composed of nanoparticles with and without phase change material (PCM). When compared to the other nanofluids tested, the NEPCM nanofluid presented the lowest pressure loss and the greatest heat transfer improvement within the diffuser. The Nusselt number of NEPCM nanofluids is enhanced by 15%, while for NEPCM_Al2O3 and Al2O3 nanofluids is increased by 10% and 6%, respectively. Similarly, the pressure drop is greater as compared to the base fluid, where the pressure drop is increased by 1%, 3.5%, and 5% for NEPCM, Al2O3, and NEPCM_Al2O3 nanofluid, respectivelyItem Numerical investigation of wax deposition features in a pipeline under laminar flow conditions(Elsevier, 2022) Boucetta, Rachid; Haddad, Zoubida; Zamoum, Mohammed; Kessal, Mohand; Arıcı, MüslümWax deposit inside pipelines continues to be a critical issue in the oil and gas industry. The available wax deposition data in the literature are currently insufficient to construct viable predictive numerical methods that capture all wax deposit features. Therefore, more research studies are required to improve our understanding of the physics of wax-deposition phenomena. In the present paper, a numerical study is performed to predict the temporal and spatial distribution of the porous wax deposit during laminar flow in a pipe. A mathematical model which combines the energy and momentum balance equations and molecular diffusion model by Fick's law is employed to better describe the wax deposit. Validation with experimental data as well as numerical results and characteristics of wax deposition are presented. The results revealed that an increase in the deposition time and porosity leads to a significant increase in the wax deposit content and pressure drop, and a decrease in the fluid temperature, heat transfer coefficient, and flow rate. However, an increase in porosity leads to larger variation of these parameters over a short period of time. Further, it is demonstrated that the wax deposit is concentrated over a short axial length, and its maximum which appears at X/L = 0.014 is kept unchanged with time and porosity variationItem Natural convection melting of phase change material in corrugated porous cavities(Elsevier, 2022) Iachachene, Farida; Haddad, Zoubida; Abu-Nada, Eiyad; Sheremet, Mikhail A.In this paper, a numerical study is carried out to examine the melting inside a wavy cavity under partial heating. A wide range of numerical computations have been performed to understand the effect of porosity, pore density, wall waviness, and heater location and intensity on the melting process. The results revealed that lower metal foam porosity resulted in higher melting rate and lower thermal storage capacity. However, pore density indicated no effect on melting performance for porosity in the range 80–96 %. When considering heater location at various porosities, its impact on melting performance is small at low porosity but becomes significant at higher porosity. Top–bottom partial heating can save almost 10 % of the melting time at ɛ = 0.96. Moreover, the PCM can store more energy, i. e. 11.36 %, when the heater location was changed from center or top–bottom position to top or bottom position at ɛ = 0.96. The results further showed that increasing the number of undulations can save 27.4 % of the melting time at ε = 0.96. Therefore, it can be concluded that higher energy storage and melting rate can be achieved by increasing the number of undulations