Araştırma Çıktıları | WoS | Scopus | TR-Dizin | PubMed
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Publication Metadata only Changes in mechanical properties of copper-silver matrix welded by the iron blade by increasing initial pressure: A molecular dynamics approach(ELSEVIER, 2024) Ayadi, Badreddine; Jasim, Dheyaa J.; Sajadi, S. Mohammad; Nasajpour-Esfahani, Navid; Salahshour, Soheil; Esmaeili, Shadi; Sabetvand, Rozbeh; Elhag, Ahmed Faisal Ahmed; University Ha'il; Universite de Sfax; Ecole Nationale dIngenieurs de Sfax (ENIS); Al-Amarah University College; Cihan University-Erbil; University System of Georgia; Georgia Institute of Technology; Okan University; Lebanese American University; Bahcesehir University; Semnan University; Amirkabir University of Technology; Qassim UniversityAtomic investigation of many common phenomena can be included as interesting achievements. Using these achievements makes it possible to design promising structures for various actual applications. The current research describes the mechanical performance of Ag and Cu samples after welding at various initial pressures. For this purpose, the Molecular Dynamics (MD) approach is used via the LAMMPS package. Technically, MD simulations are done in 2 main steps. Firstly, the atomic stability of welded Ag-Cu samples is described at various initial conditions (initial pressure). Then, tension test settings are implemented in equilibrated systems. The MD outputs indicate that the physical stability of the welded samples was altered by changing the initial pressure between 1 and 10 bar. Simulation results predict that the mechanical resistance of atomic samples decreases by enlarging the initial pressure. Numerically, the ultimate strength of the Ag-Cu matrixes decreases from 1.424 MPa to 1.241 MPa by increasing the initial pressure from 1 bar to 10 bar, respectively. This mechanical performance arises from atomic disorder created inside samples. So, it is expected that initial condition changes affect the atomic evolution of welded metallic samples, and this phenomenon should be considered in the design of mechanical structures in industrial cases.Publication Metadata only Influence of graphene nanoplate size and heat flux on nanofluid heat exchanger performance: A molecular dynamics approach(PERGAMON-ELSEVIER SCIENCE LTD, 2025) Yang, Zhongxiu; Basem, Ali; Jasim, Dheyaa J.; Singh, Narinderjit Singh Sawaran; Saeidlou, Salman; Al-Bahrani, Mohammed; Sajadi, S. Mohammad; Salahshour, Soheil; Hasanabad, Ali Mohammadi; Weifang University of Science & Technology; University of Warith Alanbiyaa; Al-Maarif University; INTI International University; Canterbury Christ Church University; Al-Mustaqbal University College; Okan University; Bahcesehir University; Ministry of Education of Azerbaijan Republic; Khazar UniversityThis study aimed to enhance the thermal efficiency of nanofluid-based heat exchangers by exploring the simultaneous effects of external heat flux and graphene nanoplate sizes on thermal and structural characteristics. Effective heat transfer is a critical requirement for managing heat in microscale systems, where optimizing the thermal performance of nanofluids can improve device performance. Molecular dynamics simulations were carried out of a sinusoidal inner surface copper heat exchanger coated with silicon nanoparticles to demonstrate atomic-level interaction within the nanofluid. The significant findings showed that while an external rising heat flux decreased heat flux from 41.7 to 37.26 W/m2 and thermal conductivity of nanofluid from 14.53 to 13.80 W/ m & sdot,K, only an increase in viscosity from 0.32 to 0.49 mPa & sdot,s, the agglomeration time of nanoparticles decreased from 3.71 to 3.33 ns and friction coefficient from 0.022 to 0.015, could indicate a difference in particle behavior responding to the thermal stress. However, the size of the graphene nanoplate from 5 to 15 & Aring, increases the heat flux from 40.05 to 46.77 W/m2 and thermal conductivity of the nanofluid from 14.15 to 14.99 W/m & sdot,K, since the larger graphene nanoplate films can produce a more substantial covalent bonding and link interlayer coupling. In contrast, the larger nanoplate also enhanced viscosity from 0.30 to 0.39 mPa & sdot,s, aggregation time from 3.64 to 4.01 ns, and friction coefficient from 0.020 to 0.026, which indicated lower particle mobility. This study was the first of its kind to contribute to the existing knowledge gap by investigating the simultaneous effect of both the nanoplate size and external heat flux in an oscillating microchannel heat exchanger. The knowledge provided offers an experimental pathway in optimizing the nanofluid properties and the heat exchanger geometry for improved thermal management for compact and microscale applications.Publication Metadata only Using CFD analysis to evaluate the performance of a natural gas compressor under different geometries of internal parts(ELSEVIER, 2025) Liu, Rong; Ali, AliB. M.; Jasim, Dheyaa J.; Singh, Narinderjit Singh Sawaran; Al-Bahrani, Mohammed; Ahmad, Zubair; Akbari, Omid Ali; Salahshour, Soheil; Hasanabad, Ali Mohammadi; Jilin University; University of Warith Alanbiyaa; Al-Maarif University; INTI International University; Al-Mustaqbal University College; King Khalid University; King Khalid University; Arak University; Okan University; Bahcesehir University; Ministry of Education of Azerbaijan Republic; Khazar UniversityNatural gas transmission networks in some countries are the main arteries of this energy source. Their extensiveness and the fluid properties of natural gas necessitate proper compression under all conditions. The design of pressure boosting stations and the operation prediction under different consumer demand conditions necessitate using several parallel compressors capable of different rotational speeds. In this study, a model of a heavy-duty centrifugal compressor used in these stations has been studied. First, using the finite volume method, the compressor is simulated with initial conditions and in three dimensions. Then, suggestions are made to modify the geometry of its various parts, and their effects under all flow rates and rotational speeds are examined. The impact of the number of blades/vanes in the impellers, the intermediate diffuser, and the inlet channel has been studied. The effect of using splitters has also been examined. The results show that although the use of splitters is not recommended, changing the number of blades/vanes in other parts can increase the efficiency of the compressor. Increasing the number of IGVs reduces the compressor power consumption by 5.9 %. Increasing the number of IBs from 15 to 18 for the first and second stages increases the outlet pressure by 2.93 % and 0.32 %, respectively. It also decreases the outlet entropy by 46.80 % and 28.45 %, respectively. It also decreased TKE in the first stage from 172.83J/K to 139.26J/K (19.99 %) and increased it from-52.73 to 4.77J/K in the second stage. Reducing the number of diffuser vanes to 19 increased the efficiency by 1.1 %. Reducing the number of IBs to 15 increased the efficiency by 2.55 %. In general, since the natural gas consumption flow rate has changed from the initial design condi-tions, and the performance improvement resulting from the proposed modifications is greater at higher flow rates, these changes are justified.Publication Metadata only Investigating the effect of the number of layers of the atomic channel wall on Brownian displacement, thermophoresis, and thermal behavior of graphene/water nanofluid by molecular dynamics simulation(ELSEVIER, 2024) Guo, Xinwei; Jasim, Dheyaa J.; Alizadeh, Asad; Keivani, Babak; Nasajpour-Esfahani, Navid; Salahshour, Soheil; Shamsborhan, Mahmoud; Sabetvand, Rozbeh; North China University of Water Resources & Electric Power; Shanghai Jiao Tong University; Al-Amarah University College; Cihan University-Erbil; Kirsehir Ahi Evran University; University System of Georgia; Georgia Institute of Technology; Okan University; Bahcesehir University; Lebanese American University; University of Zakho; Amirkabir University of Technology; Xi'an University of Science & TechnologyNanofluids (NFs) are nanoscale colloidal suspensions containing dense nanomaterials. They are two-phase systems with solid in liquid phase. Due to their high thermal conductivity, nano -particles increase the thermal conductivity (TC) of base fluids, one of the basic heat transfer parameters, when distributed in the base fluids. The present research investigates the thermal behavior, Brownian motion, and thermophoresis of water/graphene NF affected by different numbers of atomic wall layers (4, 5, 6 and 7) by molecular dynamics (MD) simulation. This investigation reports changes in heat flux (HF), TC, average Brownian displacement, and ther-mophoresis displacement. By raising the number of atomic wall layers from 4 to 7, the average Brownian displacement and thermophoresis displacement increase from 3.06 angstrom and 23.88 angstrom to 3.62 and 25.05 angstrom, respectively. Increasing the number of layers due to the decrease in temper-ature increases the temperature difference between the hot and cold points along the channel. It increases the Brownian motion and the maximum temperature. Additionally, by raising the atomic layers of the channel wall, the values of HF and TC increase from 39.54 W/m2 and 0.36 W/mK to 41.18 W/m2 and 0.42 W/mK after 10 ns, respectively. The temperature rose from 1415 to 1538 K. These results are useful in different industries, especially for improving the thermal properties of different NFs.Publication Metadata only Molecular dynamics simulation of mechanical and oscillating characteristics of graphene nanosheets with zigzag and armchair edges(ELSEVIER, 2024) Fei, Qiang; Al-dolaimy, F.; Sajadi, S. Mohammad; Alawadi, Ahmed Hussien; Haroon, Noor Hanoon; Jasim, Dheyaa J.; Salahshour, Soheil; Alsaalamy, Ali; Eftekhari, S. Ali; Hekmatifar, Maboud; Guangdong University of Science & Technology; Al-Zahraa University for Women; Cihan University-Erbil; Islamic University College; Islamic University College; University of Babylon; Al-Ayen University; Al-Amarah University College; Okan University; Bahcesehir University; Lebanese American University; Imam Jaa'far al-Sadiq University; Islamic Azad UniversityAn oscillator is a circuit that can produce a continuous, repetitive, and alternating waveform without any input. However, the oscillations caused by the conversion between the two forms of energy cannot last forever. As a result, the amplitude decreases until it becomes zero, thus causing their nature to decrease. After discovering graphene nanosheets, their use in nanoelectricity science was much considered. Due to the amazing properties of graphene nanosheets, they can be used to establish permanent oscillations. The results show that graphene nanosheets ' mechanical properties and electrical properties depend on their structure and shape. Therefore, this study investigates the effect of graphene nanosheets type, size, and temperature on the simulated nanostructure's mechanical properties and oscillating behavior with Molecular Dynamics simulation. The results show that the graphene nanosheets with zig-zag edges has higher mechanical strength than armchair edges. Young's modulus and Ultimate strength of graphene nanosheets with zig-zag edges are numerically 1079 and 115 GPa, respectively. On the other hand, the resistance in graphene nanosheets can be expressed by reducing the oscillation amplitude and increasing the oscillation frequency. The results show that by changing the armchair edges to zigzag, the oscillation amplitude of graphene nanosheets decreases from 10.36 to 9.82 angstrom. Also, by enhancing the length of graphene nanosheets from 30 to 100, the oscillation amplitude of graphene nanosheets increases from 7.59 to 12.12 angstrom. This increase is due to the increases in the contact surface of the atomic structures. Consequently, the interactions between the carbon particles and mechanical resistance decrease. According to the results of this project, the findings improve the dynamics of nanoscale oscillators and cause a significant improvement in the performance of various devices.Publication Metadata only The effect of initial conditions (temperature and pressure) on combustion of Fe-coated-aluminum hydride nanoparticles using the molecular dynamics approach(ELSEVIER, 2024) Yuanlei, Si; Hammoodi, Karrar A.; Sajadi, S. Mohammad; Rashid, Farhan Lafta; Li, Z.; Jasim, Dheyaa J.; Salahshour, Soheil; Esmaeili, Shadi; Sabetvand, Rozbeh; Jiangsu Vocational Institute of Architectural Technology; University of Warith Alanbiyaa; Cihan University-Erbil; University of Kerbala; Donghai Laboratory; Opole University of Technology; Al-Amarah University College; Okan University; Bahcesehir University; Lebanese American University; Semnan University; Amirkabir University of TechnologyHighly combustible elements like beryllium, lithium, Al, Mg, and Zn have the highest combustion, increasing the heat in explosives and propellants. Al can be used because of its greater avail-ability. Reducing the size of Al nanoparticle (NP) increases the combustion rate and decreases the combustion time. This paper studied the effect of initial conditions on the phase transition (PT) and atomic stability times of Fe-coated-aluminium hydride (AlH3) NPs. The molecular dynamics (MD) technique was used in this research. The microscopic behavior of structures was studied by density (Den.), velocity (Vel.), and temperature (Tem.) profiles. Heat flux (HF), PT, and the atomic stability of the structure were examined at different initial pressures (IP) and initial temperatures (IT). According to the achieved results, Den., Vel., and Tem. values had a maximum value of 0.025 atoms/angstrom 3, 0.026 angstrom/ps, and 603 K. By increasing IT in the simulation box to 350 K, HF in the samples increases to 75.31 W/m2. Moreover, the PT time and atomic stability time by increasing IP reach to 5.93 ns and 8.96 ns, respectively. Regarding the importance of the phe-nomenon of heat transfer and PT of nanofluids (NFs), the findings of this study are predicted to be useful in various industries, including medicine, agriculture, and others.Publication Metadata only Numerical investigation of the heat flux frequency effect on the doxorubicin absorption by Bio MOF11 carrier: A molecular dynamics approach(ELSEVIER, 2024) Ben Said, Lotfi; Basem, Ali; Jasim, Dheyaa J.; Aljaafari, Haydar A. S.; Ayadi, Badreddine; Aich, Walid; Salahshour, Soheil; Eftekhari, S. Ali; University Ha'il; Universite de Sfax; Ecole Nationale dIngenieurs de Sfax (ENIS); University of Warith Alanbiyaa; Al-Amarah University College; University of Iowa; University of Technology- Iraq; Universite de Sfax; Ecole Nationale dIngenieurs de Sfax (ENIS); Universite de Monastir; Okan University; Bahcesehir University; Lebanese American University; Islamic Azad UniversityThe present study investigated the effect of heat flux frequency on doxorubicin adsorption by bio MOF11 biocarrier using molecular dynamics simulation. This simulation examined the effect of several heat flux frequencies (0.001, 0.002, 0.005, and 0.010 1/fs) on the quantity of drug particles absorbed, mean square displacement (MSD), diffusion coefficient, and interaction energy. The present outputs of simulations predicted the structural stability of the modeled MOF-drug system in 300 K. Also, simulation outputs predicted by frequency optimization, the adsorption of target drug inside MOF11 maximized, and efficiency of this sample in actual clinical applications, such as drug delivery process increased. Numerically, the optimum value of frequency was estimated to be 0.005 1/fs. Using this heat setting, the interaction energy between MOF 11 and the doxorubicin drug increased to -929.05 kcal/mol, and the number of penetrated drug particles inside MOF11 converged to 207 atoms. The results reveal that the MSD parameter reached 64.82 angstrom 2 after 100000 -time steps. By increasing frequency to 0.005 fs-1, this increased to 78.05 angstrom 2. By increasing MSD parameter, the drug diffusion process effectively occurred, and the diffusion coefficient increased from 67.29 to 82.47 nm2/ns. It is expected that the findings of present investigation guide the design of more efficient drug delivery platforms, enhance drugcarrier interactions, improve manufacturing processes, and aid in developing novel nanomaterials with enhanced adsorption properties for various applications.Publication Metadata only Numerical examination of exergy performance of a hybrid solar system equipped with a sheet-and-sinusoidal tube collector: Developing a predictive function using artificial neural network(ELSEVIER, 2024) Sun, Chuan; Fares, Mohammad N.; Sajadi, S. Mohammad; Li, Z.; Jasim, Dheyaa J.; Hammoodi, Karrar A.; Nasajpour-Esfahani, Navid; Salahshour, Soheil; Alizadeh, As'ad; Huanggang Normal University; University of Basrah; Cihan University-Erbil; Donghai Laboratory; Opole University of Technology; Al-Amarah University College; University of Warith Alanbiyaa; University System of Georgia; Georgia Institute of Technology; Okan University; Bahcesehir University; Lebanese American University; Urmia UniversityIntegrating cooling systems with photovoltaic-thermal (PVT) collectors has the potential to mitigate the exergy consumption in the building sector due to their capability for simultaneous power and thermal energy generation. The simultaneous utilization of nanofluid and geometry modification resulted in a synergetic enhancement in the performance of PVTs and thereby reducing their sizes and costs. In addition, there is still a lack of high accurate predictive model for the estimation of the performance of PVTs at a given Re number and nanofluid concentration ratio to be used in engineering design for the further product commercialization. To this end, the current numerical study investigates the exergy electricity, thermal, and overall exergies of a building-integrated photovoltaic thermal (BIPVT) solar collector with Al2O3/water coolant. The increase in nanoparticle concentration (omega) from 0 % to 1 % increased the useful thermal exergy and overall exergy efficiency (Exu,t/ Yov) by 0.3999 %/0.0497 %, 1.3959 %/0.2598 %, and 0.7489 %/0.1771 % at Re numbers of 500, 1000, and 1500, respectively, while Exu,t/ Yov exhibited a reducing trend at Re = 2000, 0.3928 %/0.1056 % decrease. In addition, the increase in omega from 0 % to 1 % caused the useful electricity and electrical exergy (Exu,e/ Ye) to be diminished by 0.0060 %/0.0025 % at Res 500 and 1000, and to be escalated by 0.0113 %/0.0055 % at Res of 1500 and 2000. Meanwhile, the Re augmentation, from 500 to 2000, improved the Exu,t, Exe, Ye, and Yov by 60 %, 1.26 %, 1.26 %, and 17.50 %, respectively, at different omega s. In addition, two functions were developed and proposed by applying a group method of data handling-type neural network (GMDH-ANN) to forecast the value of Υov based on two input values (Re and omega). The results showed high accuracy of the proposed model with MSE, EMSE, and R2 of 0.0138, 0.1143, and 0.99785, respectively.Publication Metadata only Examination of the vessel's shape, resistive force and volumetric-aqueous efficiencies to optimize the vessels' foil under noise propagation(CELL PRESS, 2024) Xu, Zhiheng; Shi, Yan; Saraswat, Shelesh Krishna; Jasim, Dheyaa J.; Keshavarzi, Ahmad; Salahshour, Soheil; Alawadi, Ahmed; Eftekhari, S. A.; Yangzhou Polytechnic Institute; Hebei University of Water Resources & Electric Engineering; GLA University; Al-Amarah University College; Islamic Azad University; Okan University; Bahcesehir University; Lebanese American University; Islamic University CollegeThere are several parameters in designing undersurface vessel forms, the most important of which is the hull's total strength, which includes the strength of the hull and its attachments. According to studies, 70 % of the total strength of the vessels is related to their hull only without attachments. The hull has three major parts: nose, cylinder, and heel. The advanced vessels' architecture has a parallel shape (cylinder shape). This cylindrical part is important in examining the used volume by pilots and vessel equipment. This paper uses the CFD method to examine the vessel's shape, and the resistive force and volumetric-aqueous efficiencies are extracted. An optimum profile is extracted by the values of resistive force and volumetric-aqueous efficiencies. The results indicate the significant effect of the hull form on the hydro-acoustic noise of the hull. In other words, by optimizing the hydrodynamic form of the hull, the noise propagation can be reduced as much as possible. Also, the linear slope of the optimized hull is not optimized more than the hull. This means that the turbulence caused by the optimized hull has a higher damping potential.Publication Metadata only Thermal performance of forced convection of water- NEPCM nanofluid over a semi-cylinder heat source(ELSEVIER, 2024) Wang, Xiaoming; Rasheed, Rassol H.; Keivani, Babak; Jasim, Dheyaa J.; Sultan, Abbas J.; Hamedi, Sajad; Kazemi-Varnamkhasti, Hamed; Salahshour, Soheil; Toghraie, Davood; University of Shanghai for Science & Technology; University of Shanghai for Science & Technology; University of Warith Alanbiyaa; Ege University; Al-Amarah University College; University of Technology- Iraq; University of Missouri System; Missouri University of Science & Technology; University System of Ohio; University of Cincinnati; Shahid Beheshti University; Okan University; Bahcesehir University; Lebanese American University; Islamic Azad University1) Background: Phase change materials (PCMs) have been used statically, which has caused the use of these materials to face challenges. Encapsulating PCMs and combining them with the base fluid can significantly solve the problem of using PCMs in BTM systems. In the present study, based on computational fluid dynamics, forced convection heat transfer of nano -encapsulated phase change materials (NEPCM) in a BTM system are simulated. The main aim of the present research is to reduce the temperature at the surface of the hot cylinder. 2) Methods: In this research, we simulated lithium battery thermal management systems in both steady and transient states. The effects of using NEPCM particles to water were investigated. Modeling is implemented using the finite volume method and the PIMPLE and SIMPLE algorithms in OpenFoam. Furthermore, the effects of battery heat flux, Reynolds number, and the presence of nanoparticles (NPs) were analyzed. We intend to evaluate the optimal state of the system by studying the mentioned parameters. 3) Significant Findings: Our study shows that adding 3.5% NEPCM to water can reduce the length of the vortex by 22% and in unsteady -state simulation, it is observed that the presence of NEPCM particles in water reduces battery temperature up to 0.66 K.