ALI MOHAMMED HUSSEIN MOHSEN
@taylors.edu.my
Senior Lecturer, School of Engineering, Faulty of Innovation and Technology, Taylor's University
School of Engineering, Faulty of Innovation and Technology, Taylor's University, Subang Jaya 47500, Malaysia
RESEARCH INTERESTS
Computational Fluid Mechanics, Supersonic/Hypersonic Flow, Shock Wave, Heat Transfer
Scopus Publications
Scholar Citations
Scholar h-index
Scholar i10-index
Scopus Publications
Naseer H. Hamza, Ammar Abdulkadhim, Ali M. Mohsen, and Azher M. Abed
Wiley
AbstractDomestic stack is considered to investigate the double‐diffusive laminar natural convection. The working fluid is a gaseous mixture that has similar physical properties to carbon dioxide. Knowing the patterns of gaseous mixture distribution and determining the carbon deposit regions can help in carbon capture problems. The present study uses the finite element method to numerically examine the double ratio‐diffusive physical phenomena in a rectangular‐trapezoidal enclosure and to simulate the stack under a wide range of dimensionless parameters, such as buoyancy ratio , Lewis number , and Rayleigh number for different aspect ratios. Nine different cases of the geometrical ratio are selected to cover most possible design configurations. The results indicate that increasing the Lewis number leads to augmented solutal transport but reduces heat transfer. However, both heat and mass transfer are observed by increasing the buoyancy ratio. It is worth mentioning that increasing the ratio of upper side length to base length from to leads to a significant increase in mass transfer by 75% and heat transfer enhancement ratio by around 50%.
Samer A. Kokz, Ali M. Mohsen, Khaldoon Khalil Nile, and Zainab B. Khaleel
Walter de Gruyter GmbH
Abstract As the main load bearer throughout the gait cycle, the tibia is a crucial bone in the lower leg that distributes ground reaction forces with each stride. Comprehending the distribution of stress inside the tibia is essential for both avoiding fractures and developing efficient methods of redistributing load to promote healing and biomechanical correction. The study examined the stress, strain, and deformation encountered by the tibia over a 7-s walking cycle using an ANSYS workbench software, using tibia bone under a period of force applied to the boundary condition at intervals of 0.2 s. The tibia encounters stress levels varying from 0 to 1,400 N, exhibiting a regular pattern that aligns with the loading attributes often associated with traditional walking. The research conducted in this study identified the occurrence of maximum stress levels, measuring 25.45 MPa. Additionally, related peak elastic strains and deformations were observed, measuring 2.19 × 10−3 and 2.43 mm, respectively. The patterns that have been seen indicate that there is an initial contact of the foot with the ground, followed by the bearing of weight and subsequently the toe-off. These observed patterns closely resemble the natural motion of the foot during the act of walking. Temporal fluctuations in elastic strain through the tibia throughout a gait cycle reveal that the strain is mostly cantered at the medial surface of the tibia. Additional investigation into the elastic properties and overall deformations of the tibia yielded valuable observations on prospective areas of interest within the bone’s structure. These findings are of utmost importance for biomechanical assessments and the identification of potential injury hazards in subsequent research endeavours.
Ahmed Oleiwi, A. M. Mohsen, Ammar Abdulkadhim, Azher M. Abed, Houssem Laidoudi, and Aissa Abderrahmane
Wiley
Adil Mahmood, Samer Kokz, and A.M. Mohsen
Centre for Evaluation in Education and Science (CEON/CEES)
The effects of ultrasonic impact peening (UIP) on the mechanical properties and fatigue strength of the AA1100 alloy were compared to those of the untreated alloy. The UIP technic is widely used in a variety of applications to increase the hardness, tensile strength, surface characteristics, and fatigue life of metals. Due to the plastic deformation of the surface layer, the UIP process generated compressive residual stresses in the metal's upper layers. Extensive investigations were carried out in order to determine the significant effect of the UIP process on the mechanical characteristics and fatigue life of the metal. According to the results of the experiment, the percentage of increase in ultimate tensile strength (UTS), yield stress, and hardness were 8 %, 7.05 %, and 9 %, respectively. A substantial improvement in fatigue life of the AA1100 alloy was seen as a result of this treatment when compared to the untreated samples. The results demonstrated that the UIP is a reliable approach for generating compressive residual stresses in the AA1100 alloys, which may have a favourable influence on the fatigue behaviour of the alloys.
Ali Basem, Karrar A. Hammoodi, Ammar M. Al-Tajer, A.M. Mohsen, and Ihab Omar
Elsevier BV
Ammar M. Al-Tajer, Abdulhassan A. Kramallah, Ali M. Mohsen, and Nabeel Sameer Mahmoud
International Information and Engineering Technology Association
The paper presents experimental comparison of forced convection for steady state turbulent flow of nanofluid (Al2O3-distilled water) inside circular and elliptical (aspect ratio of 0.75) cross section tubes of identical circumference and tube surface area. Convection coefficient, pressure change, and fiction factor were compared at different Reynolds number (3,000-9,230) with different nanoparticles volume concentration (0.5%, 1.0%, and 1.5%). The results showed that Nusselt number increases with increasing Reynolds number and nanoparticle volume concentration. The pressure drops and friction factor of nanofluid are higher than the distilled water and are increasing as the volume concentration increases. Furthermore, the elliptical tube provided small increase in Nusselt number compared to that of circular cross sectional tube. However, the friction factor in the elliptical tube was slightly higher.
A. Mohsen, M. Yusoff, H. S. Aljibori, A. Al-Falahi and A. Kadhum
In the current research, an axisymmetric model is developed to study high-speed unsteady flow in the test section of a 7 meter-long shock tunnel. The computational calculations of the shock tunnel are conducted using the Fluent CFD solver. The Finite Volume Method (FVM) is used to discretize the governing equations of mass, momentum, and energy. The accuracy of the numerical model is investigated with first-order upwind, second-order upwind, and third-order MUSCL schemes. Adaptive mesh refinement is implemented to resolve the shock wave and contact surface regions accurately. The numerical results are compared with theoretical calculations and experimental data from experimental tests and the comparison shows good agreement. Different test gases of Helium, Air and CO2, are utilized in the current study. The results show that steady test conditions are maintained for a longer test time by adjusting the pressure ratio and gas combination across the diaphragm. The highest shock wave speed and strength are achieved for a gas combination of Helium-CO2, but a longer test duration is observed when using Air as the test gas.
Dhuha Radhi, Ali Mohsen, and Ammar Abdulkadhim
International Information and Engineering Technology Association
Received: 3 March 2019 Accepted: 4 June 2019 The two-phase fluid flow had many engineering applications like the fluidized bed, combustion, separation and collection of ducts, nuclear waste disposal, etc. which is the motivation for the researchers to investigate this phenomenon. In present investigation an experimental facility was developed to study the two-phase flow behavior inside a rectangular channel with rectangular obstructions with various air/water flow rates. The flow arrangement, air bubble generation along with pressure drop and pressure fluctuations were monitored in the present work. The experimental data was recorded using four pressure transducers and the air-water flow behavior was visualized with a camcorder for air flow rates of 8.3, 16.6, and 25 L/min and different water flow rates of 5, 10, 15 and 20 L/min. The results showed that by increasing the water or air flow rate values, the shape, size and amount of air bubbles in the water change accordingly. Higher water flow rate causes the flow to become highly turbulent and frothy. Furthermore, significant increase in the pressure difference along the channel was observed after increasing the gas and fluid discharge values.
A. M. Mohsen, M. Z. Yusoff, H. Hasini, and A. Al-Falahi
Springer Science and Business Media LLC
Ammar Abdulkadhim, Azher M. Abed, A.M. Mohsen, and K. Al-Farhany
International Information and Engineering Technology Association
Received: 12 September 2018 Accepted: 16 November 2018 A numerical investigation is presented to illustrate the impact of aspect ratio in a conjugate heat transfer enclosure filled with porous media and partially heated from vertical walls. The left and right walls are partially heated and cooled, respectively. The remaining partitions of the vertical walls in addition to the top and bottom walls are considered to be adiabatic. the present work is limited to two different cases: TopBottom (case 1) and Bottom-Top (case 2). The dimensionless Navier-Stokes governing equations are solved using the finite element method. The parameters of interest are the modified Rayleigh number 10 ≤ Ra ≤ 10, the finite wall thickness 0.02 ≤ D ≤ 0.5, 0.1 ≤ Kr ≤ 10 and the aspect ratio 0.5 ≤ A ≤ 10. The results are presented in term of streamlines, isotherms and average Nusselt number for fluid phase and along the solid hot wall. The results indicated that the locations of partially active walls have great influence on heat transfer rate. I was shown that Bottom-Top arrangement gives better heat transfer rate compared to that of Top-Bottom. It was also found that by increasing the Rayleigh number, the rate of heat transfer increased. In contrast, increasing the wall thickness and aspect ratio reduced the heat transfer rate.
A M Mohsen, M Z Yusoff, and A Al-Falahi
IOP Publishing
Numerical study into the effects of area contraction on shock tube performance has been reported in this paper. The shock tube is an important component of high speed fluid flow test facility was designed and built at the Universiti Tenaga Nasional (UNITEN). In the above mentioned facility, a small area contraction, in form of a bush, was placed adjacent to the diaphragm section to facilitate the diaphragm rupturing process when the pressure ratio across the diaphragm increases to a certain value. To investigate the effects of the small area contraction on facility performance, numerical simulations were conducted at different operating conditions (diaphragm pressure ratios P4/P1 of 10, 15, and 20). A two-dimensional time-accurate Navier-Stokes CFD solver was used to simulate the transient flow in the facility with and without area contraction. The numerical results show that the facility performance is influenced by area contraction in the diaphragm section. For instance, when operating the facility with area contraction using diaphragm pressure ratio (P4/P1) of 10, the shock wave strength and shock wave speed decrease by 18% and 8% respectively.
A. M. Mohsen, M. Z. Yusoff, A. Al-Falahi, and N. H. Shuaib
Universiti Malaysia Pahang Publishing
This paper presents an experimental investigation into the effects of area contraction on shock wave strength and peak pressure in a shock tube. The shock tube is an important component of the short duration, high speed fluid flow test facility, available at the Universiti Tenaga Nasional (UNITEN), Malaysia. The area contraction was facilitated by positioning a bush adjacent to the primary diaphragm section, which separates the driver and driven sections. Experimental measurements were performed with and without the presence of the bush, at various diaphragm pressure ratios, which is the ratio of air pressure between the driver (high pressure) and driven (low pressure) sections. The instantaneous static pressure variations were measured at two locations close to the driven tube end wall, using high sensitivity pressure sensors, which allow the shock wave strength, shock wave speed and peak pressure to be analysed. The results reveal that the area contraction significantly reduces the shock wave strength, shock wave speed and peak pressure. At a diaphragm pressure ratio of 10, the shock wave strength decreases by 18%, the peak pressure decreases by 30% and the shock wave speed decreases by 8%.