Department of Power Mechanical Techniques Engineering, Refrigeration and Air Conditioning Branch
Al-Rafidain University College
mechanical engineering , thermal engineering , heat transfer , fluid mechanics
Muna H. Alturaihi, Wajeeh K. Hasan, Mahmoud A. Mashkour, and Laith J. Habeeb AIP Publishing
Hasan S. Majdi, Wajeeh K. Hasan, Mohammed A. Mahmood Hussein, and Laith J. Habeeb International Information and Engineering Technology Association
Raed H. Althomali, Shadia Hamoud Alshahrani, Yasir Qasim almajidi, Wajeeh Kamal Hasan, Djakhangirova Gulnoza, Rosario Mireya Romero-Parra, Mohammed Kadhem Abid, Ahmed hussien Radie Alawadi, Ali Alsalamyh, and Ashima Juyal Informa UK Limited
Veterinary pharmaceuticals have been recently recognized as newly emerging environmental contaminants. Indeed, because of their uncontrolled or overused disposal, we are now facing undesirable amounts of these constituents in foodstuff and its related human health concerns. In this context, developing a well-organized environmental and foodstuff screening toward antibiotic levels is of paramount importance to ensure the safety of food products as well as human health. In this case, with the development and progress of electric/photo detecting, nanomaterials, and nucleic acid aptamer technology, their incorporation-driven evolving electrochemiluminescence aptasensing strategy has presented the hopeful potentials in identifying the residual amounts of different antibiotics toward sensitivity, economy, and practicality. In this context, we reviewed the up-to-date development of ECL aptasensors with aptamers as recognition elements and nanomaterials as the active elements for quantitative sensing the residual antibiotics in foodstuff and agriculture-related matrices, dissected the unavoidable challenges, and debated the upcoming prospects.
Wajeeh Kamal Hasan, Mohammed Mousa Al-azzawi, Atheer Raheem Abdullah, and Laith Jaafer Habeeb International Information and Engineering Technology Association
With the beginning of 2020, the Corona virus pandemic began, which negatively affected all of humanity, as medical and engineering research began to solve many problems faced by society during the era of the virus. Those who are exposed to this situation are among the medical staff responsible for treating and quarantining patients with the Corona virus. It has become the responsibility of engineers to develop solutions to the ventilation problem in order to limit the spread of this virus. Where the aim of this research paper was to study the effect of distance between patient and nurse and the effect of ventilation on the spread of the Corona virus. where a simulation model was created a room with real and 3D dimensions was studied with a patient lying down and the nurse treating him next to him. Where the room contains an air conditioner, two outlets for the airflow and an opening for the patient's mouth to simulate the exit of carbon dioxide gas from his mouth. Where the different and high speeds were studied to find out their effect on the spread of the virus abroad and its disposal. The result proves the best flow velocity of the ventilation system is 20 m/s, which led to a large limitation of the waiting for the Corona virus. The best place for the patient and the airway in the room should not be in the same airway, and the best place is between them. where these results serve as a reference for the engineering of medical rooms in terms of the effect of ventilation and distance of the pathogen on the spread of the Corona virus.
Mohammed Ali Mahmood Hussein and Wajeeh Kamal Hasan Private Company Technology Center
With the development of simulation technology and the ability to obtain accurate numerical results, as well as with the development of information technology, software that can solve numerical problems has become necessary to see physical changes that cannot be seen by the human eye. Multiphase stream field is settled utilizing the volume of fluid (VOF) method, and the flow equations are assessed and addressed mathematically by the notable limited volume approach. As a multiphase framework without mass exchange, air/water stream is considered. For practically all cases considered in this review, the heat transfer coefficient is higher. In any case, a critical punishment pressure drop was observed especially for high mass courses through undulating channels. A wavy channel with a variable wave height was simulated to see the variables of the flow process for multi-phase materials with a square cross-section, where different speeds were used for the inlet duct for air, water and steam. The results proved that the increase in the height of the channel wall wave works to obstruct the flow and thus increases the time required for the fluid to reach the exit area. The value of time required for steam and air to reach the exit area at the channel wall wave height of 25 mm and the flow velocity of 0.1 m/s was 6.01 s, which is the longest time it took for the fluid to reach the exit area compared to other cases. The pressure value reflects the amount of turbulence in the flow process, and it's crucial for thermal improvements based on flow turbulence. The entrance flow velocity is 0.1 m/s and the wall wave height is 25 mm at a time of 2 s, when the pressure reaches 873.7 Pa.
Mustafa Abdulsalam Mustafa, Atheer Raheem Abdullah, Wajeeh Kamal Hasan, Laith J. Habeeb, and Maadh Fawzi Nassar Private Company Technology Center
This work deals with fluid-structure interaction (FSI), one of the emerging areas of numerical simulation and calculation. This research shows a numerical study investigating heat transfer enhancement and fluid-structure interaction in a circular finned tube by using alumina nanofluid as a working fluid with a typical twisted tape that has a twisting ratio of 1.85. The studied nanofluid volumes of fraction are φ=0, 3, 5 % under conditions of laminar and turbulent flow. The solution for such problems is based on the relations of continuum mechanics and is mostly done with numerical methods. FSI occurs when the flow of fluid influences the properties of a structure or vice versa. It is a computational challenge to deal with such problems due to complexity in defining the geometries, nature of the interaction between a fluid and solid, intricate physics of fluids and requirements of computational resources. CFD investigations were made based on the numerical finite volume techniques to solve the governing three-dimensional partial differential equations to get the influence of inserted twisted tape and concentration of nanofluid on heat transfer enhancement, friction loss, average Nusselt number, velocity profile, thermal performance factor characteristics, and two-way interaction in a circular tube at laminar and turbulent flow. The governing continuity, momentum and energy transfer equations are solved using Ansys Fluent and Transient Structural. The simulation results show that the deformations of two-way coupling fluctuate from side to side, with 0.004 mm, as maximum amplitude, located at the typical twisted tape center. Heat transfer dissipation improved by adding fins and as Reynolds numbers increase the heat transfer behavior increases.
Wajeeh Kamal Hasan, Ali Najim Abdullah, Mohammed Mousa Al-azzawi, and Laith Jaafer Habeeb IEEE
the direct numerical simulation study has been performed to investigate the effect of compressibility on heat transfer and transient flow over backward-facing step. The problem was investigated for Reynolds numbers varied from 46 to 140. transient Continuity, Navier-Stokes, and energy equations in two dimensions were employed taking into account the compressibility effect. The total length of channel was ten times of step heights in the direction of stream-wise. Also, the step edge considered four times the step heights based on downstream from channel inlet. The expansion ratio (ER) of channel inlet selected to be equal to two. Results for the temperature contour and velocity contour at different time steps based on different Reynolds number observed an increase in temperature and axial velocity values. While the reattachment decreases.