Matematik Bölümü Yayın Koleksiyonu
Permanent URI for this collectionhttps://hdl.handle.net/20.500.12416/413
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Article Citation - WoS: 5Citation - Scopus: 9Lattice Boltzmann Method To Study Free Convection and Entropy Generation of Power-Law Fluids Under Influence of Magnetic Field and Heat Absorption/Generation(Springer, 2022) Sefid, Mohammad; Sajadi, S. Mohammad; Ghaemi, Ferial; Baleanu, Dumitru; Nemati, Mohammad; Mohammad Sajadi, S.The aim of this present work assesses heat transfer and entropy generation arising from free convection of power-law fluids in a trapezoidal chamber under the effect of uniform and non-uniform magnetic field with heat absorption/generation by using LBM. The impact of Rayleigh number (10(3), 10(4) and 10(5)), wall slope (11.5 degrees, 26.5 degrees and 38.5 degrees), power-law index (0.75, 1.0 and 1.25), Hartmann number (0, 15, 30 and 45), type of magnetic field applied (uniform and non-uniform) with heat absorption/generation (- 10, - 5, 0, + 5 and + 10) on fluid flow and heat transfer characteristics has been evaluated. By enhancement of the Rayleigh number and decreasing wall slope of the chamber, the flow strength, the rate of heat transfer and entropy generation increase and the effect of the magnetic field becomes more remarkable. By applying a magnetic field non-uniformly, the flow strength and heat transfer rate can be grown to about 25% and 15%, respectively. At higher Hartmann and Rayleigh numbers, the effect of changing the type of magnetic field applied is more notable. By increasing the heat absorption/generation coefficient, the average Nusselt number decreases and the effect of the magnetic field increases. In the heat generation mode, the total entropy generation increases with increasing Hartmann number, while in the heat absorption mode, the opposite effect was obvious. A salient and distinctive feature of the present work compared to previous studies is the application of non-uniform magnetic field (specific type of application) in the presence of heat absorption/generation for non-Newtonian fluids, which is not researched.Article Citation - WoS: 2Citation - Scopus: 3A Survey Study of the Correlations Developed for Single-Phase Heat Transfer and Pressure Drop Using Nanofluids(Springer, 2022) Ali, Muddassir; Latif, Mohammad Hunain; Khattak, Zulfiqar; Adnan, Ahmed; Ghaemi, Ferial; Mohamed, T.; Khan, AsifNanofluids, maneuvered by the steady augmentation of metallic and non-metallic identities to nano-size in a fundamental liquid including upgraded heat absorption, show precedence regarding effective heat control at the nano-level. Besides increased heat absorption-gravity, segmentation, ballistic conduction, inter-stage frictional force, unsteady shear count, diffusion, particle shift due to adhesiveness, and coating at the meeting surface of solid and liquid, it plays an essential part in increasing thermal efficiency. The hydrogenated properties related to nanofluids are resolved through the combined effect of comparative modification in thermophysical characteristics susceptible to various factors like particle magnitude, substance and density, base liquid characteristics and acid value, liquid fever, and supplements. As a result, typical correlations stand ineffective in detailing peculiarities regarding nanofluids, and some studies led to the development concerning the transfer of heat and coefficient of friction relationship for various consolidations of nano-solution and working parameters. However, some researchers certified conventional friction factor models for nanofluids, though, some conflicting studies focused on the retribution in pressure reduction because nano-sized particles were big enough to be ignored. The basic theme attributed to this paper involves analyzing the study evolution for heat exchange and reduction in pressure interrelation for nano-solution using different analytical and constraints (working parameters). Additionally, a thorough analogy regarding heat transfer interdependency recommended for the same configuration and drift parameters is granted.Article Citation - WoS: 13Citation - Scopus: 16A Robust Scheme for Caputo Variable-Order Time-Fractional Diffusion-Type Equations(Springer, 2023) Hosseini, Kamyar; Baleanu, Dumitru; Salahshour, Soheil; Hincal, Evren; Sadri, KhadijehThe focus of this work is to construct a pseudo-operational Jacobi collocation scheme for numerically solving the Caputo variable-order time-fractional diffusion-type equations with applications in applied sciences. Modeling scientific phenomena in the context of fluid flow problems, curing reactions of thermosetting systems, solid oxide fuel cells, and solvent diffusion into heavy oils led to the appearance of these equations. For this reason, the numerical solution of these equations has attracted a lot of attention. More precisely, using pseudo-operational matrices and appropriate approximations based on bivariate Jacobi polynomials, the approximate solutions of the variable-order time-fractional diffusion-type equations in the Caputo sense with high accuracy are formally retrieved. Based on orthogonal bivariate Jacobi polynomials and their operational matrices, a sparse algebraic system is generated which makes implementing the proposed approach easy. An error bound is computed for the residual function by proving some theorems. To illustrate the accuracy and efficiency of the scheme, several illustrative examples are considered. The results demonstrate the efficiency of the present method compared to those achieved by the Legendre and Lucas multi-wavelet methods and the Crank-Nicolson compact method.Article Citation - WoS: 5Citation - Scopus: 6The Effects of Using Corrugated Booster Reflectors To Improve the Performance of a Novel Solar Collector To Apply in Cooling Pv Cells-Navigating Performance Using Ann(Springer, 2021) Oztop, Hakan F.; Alnefaie, Khalid A.; Ahmadian, Ali; Baleanu, Dumitru; Abu-Hamdeh, Nidal H.In this study, turbulent flow and heat transfer of water in a solar collector equipped with corrugated booster reflectors to apply in cooling photovoltaic cells (PV) are investigated. 3D simulation is done using by the control volume method and SIMPLEC algorithm. The optimization was carried out by comparison of different parameters to reach the optimal situation with the maximum efficiencies of energy and exergy. It is established that in the case of corrugated booster reflectors, the temperature of outlet fluid and efficiencies of energy and exergy are more. In general, while the trend of variation of exergy efficacy with impressive parameters is increasing, using the mixers precipitate the efficacy increment. Furthermore, for the case that the trend of variation of exergy efficacy with altering these parameters is reducing, the reducing trend gets slow. Finally, it is realized that using corrugated booster reflectors have a significant effect on collector efficacy, and the highest exergy efficacy was obtained for the 50 degrees corrugations. At Re = 6800, the maximum Nusselt number achieves and it is about 6.03. Finally, using an artificial neural network, the output parameters were navigated with acceptable accuracy. For 76.6% of the data points, the margin of deviation (MOD) was < 1%, and for the rest, the maximum MOD was 2%.Article Citation - WoS: 5Citation - Scopus: 4The Anomalous Nucleation in Al-Tb Metallic Glasses(Springer, 2021) Kalay, I.; Kalay, Y. E.; Ulucan, T. H.The effects of amorphous structure on the devitrification of Al90Tb10 marginal glass former system were investigated in detail by a combined study of high-energy X-ray diffraction (HEXRD), X-ray absorption fine structure (EXAFS), reverse Monte Carlo simulations (RMC), transmission electron microscopy (TEM) and thermal analyses. The atomic structures of melt-spun ribbons and magnetron sputtered amorphous samples with the same composition were simulated using RMC constrained by XRD, EXAFS, and ab-initio results. The fcc-Al nanocrystals nucleated and grown in thin-film specimens have a limited size with almost perfect spherical morphology. The population of these nanocrystals is three orders of magnitude higher as compared to ribbon specimens. The differences in the devitrified ribbon and thin-film metallic glasses were traced back to structural differences in the amorphous state. The amorphous melt-spun ribbons and magnetron sputtered thin- films were found to have different degrees of short-range order and clustering.Article Citation - WoS: 4Citation - Scopus: 3Numerical Analysis of the Effect of Hot Dent Infusion Jet on the Fluid Flow and Heat Transfer Rate Through the Microchannel in the Presence of External Magnetic Field(Springer, 2022) Sajadi, S. Mohammad; Ghaemi, Ferial; Baleanu, Dumitru; Jalali, EsmaeilIn this work, the nanofluid flow inside a microchannel with serrated injection jet on the upper wall of microchannel and using magnetic field with intensity of 0-40 Hartman were surveyed. The lower microchannel wall with jet injection racks has a constant temperature, but the upper microchannel wall is insulated among injection jets. Applying dented mode for injection jets was performed to enhance heat transfer. This research was performed for Reynolds numbers 10-50 and B = 0.01, 0.05, and 0.1 and for volume fraction of 0-6% water/Al2O3. The results indicated that the higher the height of dents was, the higher the heat transfer occurred.Article Citation - WoS: 33Citation - Scopus: 30Modeling of a Med-Tvc Desalination System by Considering the Effects of Nanoparticles: Energetic and Exergetic Analysis(Springer, 2021) Mebarek-Oudina, Fateh; Ahmadian, Ali; Baleanu, Dumitru; Abusorrah, Abdullah M.In this study, the energetic and exergetic analysis of a multi-effect desalination system with a thermal vapor compression desalination system has been numerically evaluated. For this purpose, the mass, energy, and exergy balance equations for the thermo-compressor, first effect as well as middle effects, and condenser have been developed. The effects of motive steam pressure and number of effects on yield, gained output ratio (GOR), performance ratio (PR) and irreversibility have been examined. Nanoparticles were used to improve the heat transfer properties at different stages. The highest rate of exergy destruction with 61.67% is concerned with thermo-compressor, owing to the large difference between the motive steam pressure and the entrained steam. The lowest exergy losses rate among the various components was 4.89% for the condenser, due to the fact that much of the final distillate steam entrained the thermo-compressor. As the number of effects increased from 1 to 7, the yield, GOR as well as PR, improved by approximately 590% and the irreversibility reduced by 1.88%. As the motive steam pressure increased from 400 to 1290 kPa, the yield decreased by 25.45% while the GOR and PR improved by 12.62 and 14.8%, respectively. From the second law viewpoint, irreversibility intensified by 16.11% which in turn diminished the second efficiency by 3.17%.Article Citation - WoS: 5Citation - Scopus: 7Improve the Heat Exchanger Efficiency Via Examine the Graphene Oxide Nanoparticles: a Comprehensive Study of the Preparation and Stability, Predict the Thermal Conductivity and Rheological Properties, Convection Heat Transfer and Pressure Drop(Springer, 2022) Akhgar, Alireza; Taherialekouhi, Roozbeh; D'Orazio, Annunziata; Sajadi, S. Mohammad; Ghaemi, Ferial; Baleanu, Dumitru; Ranjbarzadeh, Ramin; D’Orazio, Annunziata; Mohammad Sajadi, S.In this research, the effect of using GO/ water nanofluid as a coolant fluid in an isothermal heat transfer system was studied. At first, to evaluate the atomic bond, chemical, and surface structure of the nanoparticles, XRD-FTIR and FESEM tests were used. Two-step method was used to prepared nanofluid then DLS test was utilized to examine the stability of the nanofluid. Thermal conductivity and the dynamic viscosity were measured experimentally from 25 to 75 celcius and volume fractions of 0-0.15%. The maximum improvement in thermal conductivity is 11.2% at 0.15% and 75 celcius. Also The dynamic viscosity increased. The validity and uncertainty of the test results were examined. The heat transfer and turbulent flow of the nanofluid under a constant temperature boundary condition were investigated between 6000 and 18,700 Reynolds numbers. Various parameters such as the pressure drop, friction factor, convection heat transfer coefficient, and Nusselt number of the turbulent flow were evaluated. According to the results, the greatest increase in the convection heat transfer coefficient of the nanofluid was 34.7% compared to that of the base fluid. Also, the greatest enhancement in the friction factor was 9.64%. It can be stated that the improvement of the convection heat transfer coefficient dominantly affects the pressure drop so this nanofluid can be used as a coolant fluid in industrial systems.Article Citation - WoS: 5Citation - Scopus: 7Hydrodynamic Analysis of a Heat Exchanger With Crosscut Twisted Tapes and Filled With Thermal Oil-Based Swcnt Nanofluid: Applying Ann for Prediction of Objective Parameters(Springer, 2021) Almitani, Khalid H.; Gari, Abdullatif A.; Alimoradi, Ashkan; Ahmadian, Ali; Baleanu, Dumitru; Abu-Hamdeh, Nidal H.Present study investigates hydrodynamic analysis of heat exchanger with crosscut twisted tapes and filled with thermal oil-based SWCNT nanofluid (NF). SIMPLE algorithm and FVM method are used. The heat transfer fluid enters the test section at T-in = 300 K in different flow velocities, which are related with Reynolds numbers 5000, 10,000, 15,000 and 20,000. For ensuring that the input flow to test section is always fully developed, the input part to length 2L is considered. It is also intended to ensure that the flow does not return to test section of the exit section of length L. Also, the test section has the constant temperature of T-s = 400 K. Different geometrical parameters of twisted tapes in heat exchanger are studied. The optimization is carried out due to fulfill the highest performance evaluation criterion (PEC index). Based on results, usage of twisted tapes has a sharp impact on thermal and hydraulic characteristics of heat exchanger and leading to swirling motion, which improve the heat transfer coefficient and augment the pressure drop (Delta P). Besides, usage of simple model is more efficient than crosscut model. Also, it is understood that the PEC index values always are more than 1.11, which means that employment of these turbulators is effective and positive with thermal-hydraulic viewpoint. The simple model (Case K and N = 8) is introduced as the most optimum model in this paper, and its PEC values for system filled with NF in phi = 0.8% at Re = 5000, 10,000, 15,000 and 20,000 are 1.37, 1.59, 1.78 and 1.93, respectively. The application of machine learning methods showed that the output parameters in the simulation of heat exchangers are well predicted. The accuracy of the developed neural network was such that the maximum error was below 1%.Article Citation - WoS: 25Citation - Scopus: 24Flat Sheet Direct Contact Membrane Distillation Desalination System Using Temperature-Dependent Correlations: Thermal Efficiency Via a Multi-Parameter Sensitivity Analysis Based on Monte Carlo Method(Springer, 2021) Mebarek-Oudina, Fateh; Ahmadian, Ali; Baleanu, Dumitru; Al-Turki, Yusuf A.In this paper, a 1D model of direct contact membrane distillation is presented in which all fluid properties are temperature-dependent. In addition, a Nusselt number (Nu) relationship for developing flow in ducts (accounting for both thermal and hydrodynamic effects) is used to obtain the convective heat transfer coefficient at each side of the membrane. Simulated mass flux shows very good agreement with experimental measurements at various feed temperature, flow rate and concentration. A comprehensive sensitivity analysis of all operational and geometrical parameters, as well as Nu estimation parameters on water mass flux across the membrane (J(m)) and thermal efficiency, is also done. To determine the relative importance of each parameter, a multi-parameter sensitivity analysis (MPSA) based on the Monte Carlo method is applied, and the sensitivity index of each parameter at the defined range is computed. Results show that J(m) is highly sensitive to bulk feed inlet temperature (T-in,T-f) while both J(m) and thermal efficiency are highly sensitive to membrane porosity. Results show that among all parameters, just membrane porosity is highly sensitive which affects both mass flux and thermal efficiency especially at low T-in.f.