6 results on '"Almensoury, Mushtaq F."'
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2. Mixed convection heat transfer and entropy generation of water inside a square vented enclosure with and without four vibrating cylinders in horizontal and vertical directions.
- Author
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Almensoury, Mushtaq F., Al-Srayyih, Basil Mahdi, Al-Amir, Qusay Rasheed, Hamzah, Hameed K., Abed, Azher M., Ali, Farooq H., Bayraktar, Seyfettin, Arıcı, Müslüm, and Hatami, Mohammad
- Subjects
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HEAT convection , *HEAT transfer , *NATURAL heat convection , *NUSSELT number , *ENTROPY , *CURTAIN walls - Abstract
The control and improvement of heat transfer in enclosures is very important in several engineering applications. In the current two-dimensional numerical study, the mixed convection and entropy generation of water flowing inside a square vented enclosure that contains four vibrating cylinders with relatively low frequencies fr = 1, 2, 3, 5 Hz in the vertical and horizontal directions are reported. The effects of Reynolds and Richardson numbers, vibration frequency, vibration amplitude, and the direction of the cylinders' vibration on heat transfer and entropy generation are presented for various cases. The horizontal walls of the enclosure are kept adiabatic while the vertical left and right walls are hot and cold, respectively. The linear regression analysis was used to reveal the rate of increase in the Nusselt number with the Reynolds and Richardson numbers number for each cases. Series of analyses show that the existence and the vibration of the cylinders increases heat transfer but the vibration in the horizontal direction is more effective since the top and bottom walls of the enclosure are adiabatic. It is found that the entropy generation due to heat transfer is low at the center of the enclosure. The direct relationship between the heat transfer and both Reynolds and Richardson numbers is reported. In terms of heat transfer, it is found that the critical vibration frequency and amplitude are fr = 4 and A = 0.05L and 0.075L. [ABSTRACT FROM AUTHOR]
- Published
- 2024
- Full Text
- View/download PDF
3. Experimental study for vibration effect on aerodynamic flow-through cascade blades of gas turbine.
- Author
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Almensoury, Mushtaq F., Al-Turaihi, Riyadh S., and Alkhafaji, Dhirgham
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GAS turbine blades , *TURBINE aerodynamics , *TURBINE blades , *GAS turbines , *FREQUENCIES of oscillating systems , *TRANSONIC flow - Abstract
This research has cared about studying the effect of vibration obtained by the rotor blade row of the turbine on the aerodynamics flow between the turbine blades. The research focuses on studying the pressure distribution and velocity profile between blades turbine with effect force vibration for a different frequency (3-33 Hz). By this study, the effect of vibration on the gas turbine performance. An experimental rig was created at the University of Babylon University /Iraq by the authors. The cascade blades examined in this work are a real part that is mainly collected from Hilla/Iraq gas turbine power station. The distribution pressure is examined by sensor pressure at 18 in the region of the blade and is divided into two groups the first group on the suction side of the blade and the second on the pressure side. The pressure in X-positions was calculated with a different frequency for the blade. In the middle of the chord, at the suction and pressure sides of the blade, compared to the numerical simulation, the experimental results show that there is an increase of 5%, a decrease of 6%, and an increase of 6% at level 6,21, and 36 mm, respectively, from the base. In addition, the increase in frequency leads to an increase in the pressure on the pressure and suction sides. The pressure distribution on both sides of the blade is affected by the shape of each blade section. Three sections of the blade are taken at different heights. [ABSTRACT FROM AUTHOR]
- Published
- 2023
- Full Text
- View/download PDF
4. Free Convection of Ag/H2O Nanofluid in Square Cavity with Different Position and Orientation of Egg Shaped Cylinder.
- Author
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Rashid, Hayder K., Almensoury, Mushtaq F., Hashim, Atheer Saad, Hamzah, Hameed K., and Ali, Farooq H.
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FREE convection , *NATURAL heat convection , *CYLINDER (Shapes) , *NANOFLUIDS , *RAYLEIGH number , *NUSSELT number - Abstract
A numerical simulation was conducted to study the free convection of Ag/H2O nanofluid between a square cavity with cold walls and an egg shaped cylinder with a hot wall. Utilizing the egg equation, dimensionless governing equations were solved using the Galerkin Finite Element Method (GFEM). In this work, several parameters were studied, i.e. Rayleigh number (10³ ≤ Ra ≤ 106), volume fraction (0 ≤ φ ≤ 0.05), position (-0.2 ≤ Y ≤ 0.2), and orientation angle (-90° ≤ γ ≤ 90°). The numerical results are presented as streamline contours, isotherm contours, and local and average Nusselt numbers. Moreover, the results were used to analyze the fluids' structure, temperature distribution, and heat transfer rate. The numerical results confirmed that the stream intensity value increased with an increase of the Rayleigh number as well as the movement of the cylinder towards the bottom wall for all values of the orientation angle. Variation of the vertical position of the cylinder inside the cavity had a noticeable effect on 𝑁𝑢𝐿, which increased by 50% at γ = -90°, and by 58% at γ = -45°. However, at Y = -0.2, 𝑁𝑢𝐿 increased by 58% at γ = -45° and decreased by 7% at γ = -90°. The highest heat transfer rate was obtained at high Rayleigh number (Ra = 106), volume fraction (φ = 0.05), negative position (Y = -0.2), and the highest positive orientation angle (γ = 90°). [ABSTRACT FROM AUTHOR]
- Published
- 2021
- Full Text
- View/download PDF
5. Numerical investigation of natural convection of a non-Newtonian nanofluid in an F-shaped porous cavity.
- Author
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Almensoury, Mushtaq F., Hashim, Atheer S., Hamzah, Hameed K., and Ali, Farooq H.
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NON-Newtonian flow (Fluid dynamics) , *NATURAL heat convection , *HEAT convection , *RAYLEIGH number , *HEAT equation , *NUSSELT number , *HEAT transfer - Abstract
This study numerically investigates the free convective heat transfer of a non-Newtonian nanofluid through an F-shaped porous cavity. The thermal conditions of the walls of the cavity are assigned as TC and TH for the cold right wall and the hot left wall, respectively, and the remaining walls of the cavity are assigned as insulated walls. The model for this investigation is designed, implemented, and analyzed by COMSOL Multiphysics. The Galerkin finite element method is used to model and solve the governing equations of the flow and heat transfer process inside the porous media. Physical parameters are presented in the following order: 6 × 10 0.0, ≥ ≥ φ -2 0.4 AR 0.1, 10 10, 1.4 ≥ ≥ ≥≥ -1 Da -3 ≥n ≥ 0.6, and 10 10 ≥ ≥ Ra 6. The goal of this study is to study the influence of geometry configuration (F shape) and the above parameters on the flow structure, isotherms, and heat transfer. These parameters have been taken into account to investigate their effects on this kind of heat transfer mechanism. Results show that the addition of nanoparticles plays a significant role in changing heat transfer rates. In addition, an increase in the aspect ratio (AR) leads to create narrow areas, which promotes the stagnation zones, thus decreasing the distance between cold and hot walls. This, in turn, enhances the flow uniformity. Moreover, it has been generally concluded that the Nusselt number and velocity rates are directly proportional to the AR, Darcy number (Da), and Rayleigh number (Ra), and negatively proportional to the power-law index (n); however, there are some exceptions and unusual behaviors noticed and explained through the paper. [ABSTRACT FROM AUTHOR]
- Published
- 2021
- Full Text
- View/download PDF
6. MULTISCALE APPROACH OF THE EQUIVALENT THERMAL CONDUCTIVITY OF MODIFIED FOAM-FILLED AND NON-FILLED HOLLOW BRICK AND A BRICK WALL.
- Author
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Hashim, Atheer Saad, Almensoury, Mushtaq F., Ali, Farooq Hassan, Hamzah, Hameed Kadhem, and Ghalambaz, Mohammad
- Subjects
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THERMAL insulation , *THERMAL conductivity , *WALLS , *BRICK walls , *HEAT convection , *URETHANE foam , *ENERGY dissipation - Abstract
The energy loss through building components resulting in higher energy consumption, thus energy saving has become an essential aspect in design and comfort. This study aims to optimize the thermal insulation of red clay bricks used in the walls of buildings by using a multiscale method. The finite element approach in ABAQUS software has been used to simulate the bricks under different configurations and conditions. Due to cost and time challenges and difficulties in simulation and complex calculations, simplified and applicable equations have been derived to calculate thermal insulation properties. The results show that the paper's brick design has a significant thermal conductivity reduction that could reach more than one-third of the other corresponding studies. The study goes to fill the hollow bricks by the insulation polyurethane foam (PUF) and comparing the results with air hollow bricks. Besides its other advantages, the outcomes reveal that using the PUF has a noticeable desired-influence in thermal insulation when considering the heat transfer by convection and radiation inside the air cavity of bricks. [ABSTRACT FROM AUTHOR]
- Published
- 2021
- Full Text
- View/download PDF
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