Journal of Engineering and Sustainable Development

BEHAVIOR OF REINFORCEMENT BARS IN FOUNDATION WITH SOIL TO SATISFY SUSTAINABILITY

2023-07-16T18:03:44+00:00

This study presents the behavior of using many types of reinforcement with slab foundations to satisfy sustainability. This foundation with soil effect and two types of bar reinforcement (steel bars and geogrid) are taken. Nonlinear analysis is used with the theoretical model by finite element program software ABAQUS to represent the many types of reinforced concrete foundations with both unsaturated and saturated soil with the effect of loading. Effect of load-displacement-relationships with many cases which were taken for this study such as the geogrid and steel bar ratio in reinforcement of foundation with unsaturated and saturated soil. From this study, it is shown that reinforcement by geogrid increased the strength of the member or the foundation when taken with different ratios of reinforcement by steel bars and get the best sustainable way or solution by decreasing the reinforcement by steel. The ratio of geogrid is 40% to 20 % from total reinforcement, while the required member or foundation in the case of soil, which is unsaturated, is more strength than it is in the case of saturated soil.

NUMERICAL INVESTIGATION OF FORCED CONVECTION HEAT TRANSFER ON INLINE CYLINDERS IMMERSED IN A POROUS MEDIA

2022-11-20T22:24:52+00:00

In the present study, forced convection heat transfer on eight inline cylinders immersed in a 10 × 10 × 30 cm packed bed of porous medium is numerically explored with a range of Reynolds numbers from 1100 to 2250. The airflow passes through eight cylinders with an inline arrangement, each having a diameter of 15 mm and a length of 10 cm, immersed in a horizontal porous channel at a constant heat flux of 2000W/m². The commercial program ANSYS Fluent R.19 simulates the changes in pressure drop and temperature distribution by changing the Reynolds number and porosity. The dimensions of each porous pack are 10x10 cm in cross-section, 5 cm in length, and 5 cm in spacing from the next porous pack. The porosity values are (0.4001, 0.39112, and 0.3822). The general shape of all temperature contours shows that the high porosity near the cylinder wall enhances heat transfer from the heated cylinder surface. After that, the air temperature gradually decreases when going away from the cylinder surface. It can also be seen that the pressure drop decreases as particle diameter increases.

SHEAR CAPACITY OF REINFORCED CONCRETE BEAMS WITHOUT SHEAR REINFORCEMENT: A REVIEW

2022-12-07T07:01:07+00:00

Shear failure in reinforced concrete beams has gained excessive study, particularly beams without stirrups. Because shear failure is considered the most serious due to it occurring suddenly without warning. Because of the seriousness of the matter concerning shear failure, many researchers are looking to use additive materials that differ from traditional concrete constituents in order to improve the shear resistance of the beams, such as the use of silica fume, steel fiber, metakaolin, and many others. The current studies focused on understanding the resistance provided by the interlocking forces between the aggregate and that provided by the non-cracked compression zone, with the use of some materials that are intended to improve the properties of concrete. This paper presents a review of the previous literature that included studying the mechanism and behavior of shear failure of concrete beams without web reinforcement and also includes a presentation of the most important equations used to predict the shear capacity of concrete beams, especially those without stirrups, to understand the mechanism of failure and to know the most important factors affecting the failure of shear.

NUMERICAL AND EXPERIMENTAL INVESTIGATION OF SEMICIRCULAR SOLAR UPDRAFT TOWER SYSTEM EMPLOYING POROUS COPPER METAL FOAM

2022-08-15T23:49:18+00:00

The numerical and experimental study was carried out under Iraqi weather conditions to verify the improvement of the performance of the solar updraft tower system SUTS by introducing porous metal foam as a heat-absorbent plate. a semicircular basin of the solar collector was divided into two equal identical quarters. A porous foam material was fixed on one of the basins while the other basin was fixed on a traditional copper plate. The positions of the metal foam absorber plate are changed with two inclination angles (0֯ and 18֯) and the optimum position is achieved when it gives the highest thermal performance. A finite volume modeling technique is used to solve the governing equations and radiation heat transfer equations by using ANSYS Fluent. The experimental part was conducted in Baghdad / Iraq at latitude 33.3°. The presence of the metal foam absorber plate caused a significant decrease in the average temperatures of the heat-absorbent plate. The maximum airflow temperature was recorded with an inclined angle of 18^◦. The metal foam as a heat-absorbent plate enhanced the efficiency and the output power of the SUTS to about 51.9% and 47.2% respectively compared to the traditional plate.

COOLING OF CONCENTRATED PHOTOVOLTAICS WITH PHASE CHANGE MATERIAL AND FINS

2022-11-04T18:30:41+00:00

The increase in cell temperature with increased irradiance is probably the most significant disadvantage of using photovoltaic with reflector modules. In this study, a developed Phase Change Material system was integrated into the rear section of a concentrating Photovoltaic system to limit its temperature rise. The heat transmission of the concentrating photovoltaic with a phase change material system was investigated using an experimental method and a numerical method. The temperature distribution was simulated numerically using ANSYS 2021 three-dimensions model. Three cases were studied: one without wax, one with wax, and one with wax and fins. The results displayed convergence between the experimental results and the numerical results. The effect of using phase change materials on performance and efficiency of concentrated photovoltaic cells, the amount of temperature reduction through the wax melting period for concentration with paraffin wax and concentration photovoltaic with fin and paraffin wax by 2.8 °C and 6 °C, respectively, as well as an enhancement in efficiency of photovoltaic at the noon time of cases by 1.807% and 3.182% related to the reference photovoltaic. The outcomes also demonstrated that using fins aids in the distribution of temperatures, resulting in regular melting of wax in comparison to wax without fins.

APPLICATIONS AND CHALLENGES OF THE REVERSE OSMOSIS MEMBRANE PROCESS: A REVIEW

2022-09-25T18:36:18+00:00

Reverse osmosis is one of the most prevalent methods of generating potable water owing to its low power usage, excellent rates of contaminant removal, simple design, large output capacity, and much cheaper initial and maintenance costs than comparable alternatives. In this review, the most important published research related to the reverse osmosis process was reviewed. It was found that the majority of reported studies were related to using the reverse osmosis process for water desalination and wastewater treatment. Research has proven that the reverse osmosis process is a very effective method for desalinating water and treating industrial effluent containing heavy metals, organics, and other pollutants. Fouling was found to be one of the greatest obstacles encountered by the reverse osmosis method in water treatment, which raises operating costs due to the need for frequent cleaning, reduces the membrane's lifespan, and reduces the permeate flux. In general, microfiltration/ultrafiltration pretreatment and backwashing were among the most effective strategies suggested by researchers to reduce fouling and ensure the longevity and proper operation of the system.

THE ALUM WITH AUSTRALIAN PORCELANITE ROCKS EFFECT ON TREATING AND REMOVAL OF PHOSPHORUS FROM DAIRY WASTEWATER

2022-04-21T10:04:00+00:00

The dairy industry is a vital food industry in the world. The dairy industry discharges large quantities of wastewater. In this article, it has been used jar test model JLT 6 Leaching test VELP Scientific, with all apparatuses and tools that can complete work. Alum, as well as Porcelanite Rocks from the North Territory area in Australia, were used as a treatment material for the removal of phosphorus. Results showed the effectiveness of phosphorous removal using alum improves when using these rocks because they contain different concentrations of positive ions in general and aluminium ions in particular. The optimum value of Al³⁺ is 0.5 mg/L. The percent of removal of phosphorus will reach 95.7% ̴ 96% by 1.45 mg/L of the aluminium ion. The use of Porcelanite Rocks alone. cannot lead to clear removal of phosphorous or pollutants, rather it is used as an aid. The results also showed that Porcelanite rocks play a prominent role in preparing the therapeutic conditions for alum in terms of regulating the pH for better treatment, as they raise the pH at a time when the sulphates are reduced. With 20 mg/L of Porcelanite rocks, it has been completed the best removal of phosphorus at 20 ºC. Using alum with Porcelanite rocks as assistance in treatment will improve treatment by 30-40%. This process will drop residual aluminium concentration by about 10% from the total and then exclude health effects due to aluminium ions.

BIT ERROR PERFORMANCE ENHANCEMENT FOR UNDERWATER ACOUSTIC NOISE CHANNEL BY USING CHANNEL CODING

2023-01-25T06:48:27+00:00

The harm that underwater noise pollution poses to aquatic ecosystems and the resources that support it are being acknowledged on a worldwide scale. Fisheries and ecotourism are only two of the important businesses that are impacted by noise pollution. Reducing underwater impact noise is a major challenge for underwater acoustic communication systems. However, the implementation of noise reduction measures (noise abatement) remains limited. Most communication systems assume that the noise is both additive and Gaussian. Underwater Acoustic Noise (UWAN) systems generally perform poorly because of the often large non-Gaussian components in intermittent noise in the ocean. This study presents an experimental model (Dolphin-EAR DE200 Series) sound channel noise underwater at Lake Diyala Hamrin, Iraq, using a hydrophone model. Low data volume, multipath propagation, low bandwidth, and higher bit error rate (BER) of received data are major issues for underwater communication systems. In this paper, the Underwater Acoustic Channel (UWAC) aspect is evaluated and an error performance term is determined from the noise in the Student's t-distribution. In addition, Signals using binary phase-shift keying (BPSK) and quadrature phase-shift keying (QPSK) are used to generate error power analysis.