Pub Date : 2023-10-01DOI: 10.21608/erjsh.2023.211542.1169
Ahmed Emam, Maher Adam, A. Shanour
: The evaluation of torsion investigations is based on the increasing demand for the creative design of curved structural members; yet, they are limited concerning lightweight concrete beams. Lightweight concrete has many and diverse utilizations, including multistory building frames and floors, curtain walls and bridges. This paper investigated the effect of fiber on torsional behavior of lightweight concrete beam. Many variables were studied such as compressive strength of lightweight concrete, fiber type, fiber volume ratio, spacing between stirrups, diameter of stirrups and CFRP reinforcement. The numerical results showed that the increment in fiber content resulted in better mechanical properties and torsional resistance of lightweight concrete beams. The effect of carbon fiber and steel fiber is evident from the volume ratio 2%, which produced the highest ultimate torque enhancement to 77.64% and 76 % respectively. In addition, a rational approach is proposed to predict ultimate torque to develop the torsion design of lightweight concrete beams.
{"title":"NUMERICAL STUDY OF LIGHTWEIGHT CONCRETE BEAMS REINFORCED BY FIBERS AND SUBJECTED TO TORSION.","authors":"Ahmed Emam, Maher Adam, A. Shanour","doi":"10.21608/erjsh.2023.211542.1169","DOIUrl":"https://doi.org/10.21608/erjsh.2023.211542.1169","url":null,"abstract":": The evaluation of torsion investigations is based on the increasing demand for the creative design of curved structural members; yet, they are limited concerning lightweight concrete beams. Lightweight concrete has many and diverse utilizations, including multistory building frames and floors, curtain walls and bridges. This paper investigated the effect of fiber on torsional behavior of lightweight concrete beam. Many variables were studied such as compressive strength of lightweight concrete, fiber type, fiber volume ratio, spacing between stirrups, diameter of stirrups and CFRP reinforcement. The numerical results showed that the increment in fiber content resulted in better mechanical properties and torsional resistance of lightweight concrete beams. The effect of carbon fiber and steel fiber is evident from the volume ratio 2%, which produced the highest ultimate torque enhancement to 77.64% and 76 % respectively. In addition, a rational approach is proposed to predict ultimate torque to develop the torsion design of lightweight concrete beams.","PeriodicalId":159365,"journal":{"name":"Engineering Research Journal (Shoubra)","volume":"28 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139330572","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-10-01DOI: 10.21608/erjsh.2023.219077.1185
hoda oraby, Hossam Eldin Elborombaly, Motaz Abd El Fattah
{"title":"Optimizing daylighting performance for educational buildings by using parametric material system","authors":"hoda oraby, Hossam Eldin Elborombaly, Motaz Abd El Fattah","doi":"10.21608/erjsh.2023.219077.1185","DOIUrl":"https://doi.org/10.21608/erjsh.2023.219077.1185","url":null,"abstract":"","PeriodicalId":159365,"journal":{"name":"Engineering Research Journal (Shoubra)","volume":"93 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139326625","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-10-01DOI: 10.21608/erjsh.2023.212411.1171
Ahmed Soliman Soliman Deabes, Michael Mikheal, Esraa Ibraheem Eid, Hala Mohamed
: The Internet of Things (IoT) refers to a network of interconnected devices that operate on the internet facilitating seamless and efficient data exchange to improve human life. Energy consumption in the IoT network nodes is a major challenge. To overcome this challenge, clustering became a powerful data gathering in IoT applications that saves energy by organizing IoT nodes into clusters. The Cluster Head (CH) oversees all Cluster Member (CM) nodes in each group allowing for the creation of both intra-cluster and inter-cluster connections. There are many algorithms to improve the lifespan of the network, increase the number of active nodes, and extend the remaining energy time in IoT. These algorithms employ techniques such as clustering and optimization to enhance both the energy efficiency and overall performance of the network. In this paper, Low Energy Adaptive Clustering Hierarchy (LEACH), Genetic Algorithm (GA), Artificial Fish Swarm Algorithm (AFSA), Energy-Efficient Routing using Reinforcement Learning (EER-RL), and Modified Low Energy Adaptive Clustering Hierarchy (MODLEACH) algorithms will be studied and MATLAB code will be implemented, tested, and the results will be validated.
{"title":"Study of Clustering Technique Algorithms in IoT Networks","authors":"Ahmed Soliman Soliman Deabes, Michael Mikheal, Esraa Ibraheem Eid, Hala Mohamed","doi":"10.21608/erjsh.2023.212411.1171","DOIUrl":"https://doi.org/10.21608/erjsh.2023.212411.1171","url":null,"abstract":": The Internet of Things (IoT) refers to a network of interconnected devices that operate on the internet facilitating seamless and efficient data exchange to improve human life. Energy consumption in the IoT network nodes is a major challenge. To overcome this challenge, clustering became a powerful data gathering in IoT applications that saves energy by organizing IoT nodes into clusters. The Cluster Head (CH) oversees all Cluster Member (CM) nodes in each group allowing for the creation of both intra-cluster and inter-cluster connections. There are many algorithms to improve the lifespan of the network, increase the number of active nodes, and extend the remaining energy time in IoT. These algorithms employ techniques such as clustering and optimization to enhance both the energy efficiency and overall performance of the network. In this paper, Low Energy Adaptive Clustering Hierarchy (LEACH), Genetic Algorithm (GA), Artificial Fish Swarm Algorithm (AFSA), Energy-Efficient Routing using Reinforcement Learning (EER-RL), and Modified Low Energy Adaptive Clustering Hierarchy (MODLEACH) algorithms will be studied and MATLAB code will be implemented, tested, and the results will be validated.","PeriodicalId":159365,"journal":{"name":"Engineering Research Journal (Shoubra)","volume":"292 1 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139328161","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-10-01DOI: 10.21608/erjsh.2023.228353.1202
Samar Azzam, S. Mohamed, karim eldash
: Engineering tasks performed by construction firms, including design review, preparation of shop drawings, planning and follow-up, cost control, value engineering, and as-built drawings, are essential for completing construction projects. Contractors usually perform these tasks using their resources. However, some contractors outsource engineering activities to specialized engineering or consultant firms. The main objective of this article is to review and summarize outsourcing studies published in different databases. In addition, studies related to engineering tasks by construction firms are reviewed to relate to the most comprehensive research on outsourcing these tasks. The overview process includes a basic definition of outsourcing and the different engineering tasks performed by construction firms. Additionally, this study presents the drivers of outsourcing, risks, and outsourcing decisions. The study highlighted a shortage of existing research on the outsourcing of engineering tasks performed by construction firms. It may serve as a starting point for researchers interested in outsourcing engineering tasks.
{"title":"Outsourcing Engineering Tasks by Construction Firms: State-of-the-Art","authors":"Samar Azzam, S. Mohamed, karim eldash","doi":"10.21608/erjsh.2023.228353.1202","DOIUrl":"https://doi.org/10.21608/erjsh.2023.228353.1202","url":null,"abstract":": Engineering tasks performed by construction firms, including design review, preparation of shop drawings, planning and follow-up, cost control, value engineering, and as-built drawings, are essential for completing construction projects. Contractors usually perform these tasks using their resources. However, some contractors outsource engineering activities to specialized engineering or consultant firms. The main objective of this article is to review and summarize outsourcing studies published in different databases. In addition, studies related to engineering tasks by construction firms are reviewed to relate to the most comprehensive research on outsourcing these tasks. The overview process includes a basic definition of outsourcing and the different engineering tasks performed by construction firms. Additionally, this study presents the drivers of outsourcing, risks, and outsourcing decisions. The study highlighted a shortage of existing research on the outsourcing of engineering tasks performed by construction firms. It may serve as a starting point for researchers interested in outsourcing engineering tasks.","PeriodicalId":159365,"journal":{"name":"Engineering Research Journal (Shoubra)","volume":"1 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139331261","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-07-01DOI: 10.21608/erjsh.2023.198925.1154
I. Ibrahim, M. Makhlouf, T. Mustafa, G. Hamdy
: Concrete ranks as one of the most important building materials, many researchers in recent years have been interested in developing and strengthening concrete by replacing concrete components with waste materials in order to eliminate these wastes and enhance the concrete's tensile, compressive, and flexural strengths. In order to continue this path, this study aims to do an experimental work to replace the waste of porcelain instead of the coarse aggregate of concrete at the rates of 25%, 50%, 75%, and 100%. For this purpose, 90 samples were poured and cured for the tests of the concrete's tensile, compressive, and flexural strengths. The results show that the mix containing 25% of the porcelain was the closest to the control mix, because the concrete’s compressive strength and tensile strength decreased for the mixture containing 25% of the porcelain compared to the control mix by 2% and 4% at the age of 28, and this decline continued with the gradual increase in the proportion of porcelain in mixtures. However, Concrete's flexural strength increased at the level of 25% replacement of porcelain by 40% compared to the control mixture and was enhanced by 24% and 9% at the levels of 50% and 75% replacement of porcelain, respectively.
{"title":"Experimental Investigation of Sustainable Concrete Containing Recycled Porcelain","authors":"I. Ibrahim, M. Makhlouf, T. Mustafa, G. Hamdy","doi":"10.21608/erjsh.2023.198925.1154","DOIUrl":"https://doi.org/10.21608/erjsh.2023.198925.1154","url":null,"abstract":": Concrete ranks as one of the most important building materials, many researchers in recent years have been interested in developing and strengthening concrete by replacing concrete components with waste materials in order to eliminate these wastes and enhance the concrete's tensile, compressive, and flexural strengths. In order to continue this path, this study aims to do an experimental work to replace the waste of porcelain instead of the coarse aggregate of concrete at the rates of 25%, 50%, 75%, and 100%. For this purpose, 90 samples were poured and cured for the tests of the concrete's tensile, compressive, and flexural strengths. The results show that the mix containing 25% of the porcelain was the closest to the control mix, because the concrete’s compressive strength and tensile strength decreased for the mixture containing 25% of the porcelain compared to the control mix by 2% and 4% at the age of 28, and this decline continued with the gradual increase in the proportion of porcelain in mixtures. However, Concrete's flexural strength increased at the level of 25% replacement of porcelain by 40% compared to the control mixture and was enhanced by 24% and 9% at the levels of 50% and 75% replacement of porcelain, respectively.","PeriodicalId":159365,"journal":{"name":"Engineering Research Journal (Shoubra)","volume":"6 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123274640","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-07-01DOI: 10.21608/erjsh.2023.209982.1166
Ibrahim Ramadan, Mohamed Refaey, Alaa Ali
: In highways engineering, finding the optimal path for a new road to join two-end points is a major challenge. This is due to presence of many complex and interrelated factors that should be taken in consideration beside a good balance between cost and geometric criteria. Many researches used models to optimize that problem and different algorithms to help designers to find the most economic and efficient path. Most of these models focus on either horizontal or vertical alignments resulting in a sub-optimal solution to the problem. In this paper, optimization of a new road path joining two end-points using heuristic techniques was studied. A* Algorithm which is considered one of optimization heuristic techniques, was used to write a programmed python script to find the target optimal path joining two end-points taking into consideration both design criteria and cost. The practical manual designed road of Toshka – El Oweinat was used as a case study to verify using of A* Algorithm in optimization of new roads path joining two end-points. By applying the model on the practical constructed road, It was found that the A* algorithm gives results with total cost less than the manual solution by about 2%.
{"title":"Optimization of new roads path using a program based on A* algorithm","authors":"Ibrahim Ramadan, Mohamed Refaey, Alaa Ali","doi":"10.21608/erjsh.2023.209982.1166","DOIUrl":"https://doi.org/10.21608/erjsh.2023.209982.1166","url":null,"abstract":": In highways engineering, finding the optimal path for a new road to join two-end points is a major challenge. This is due to presence of many complex and interrelated factors that should be taken in consideration beside a good balance between cost and geometric criteria. Many researches used models to optimize that problem and different algorithms to help designers to find the most economic and efficient path. Most of these models focus on either horizontal or vertical alignments resulting in a sub-optimal solution to the problem. In this paper, optimization of a new road path joining two end-points using heuristic techniques was studied. A* Algorithm which is considered one of optimization heuristic techniques, was used to write a programmed python script to find the target optimal path joining two end-points taking into consideration both design criteria and cost. The practical manual designed road of Toshka – El Oweinat was used as a case study to verify using of A* Algorithm in optimization of new roads path joining two end-points. By applying the model on the practical constructed road, It was found that the A* algorithm gives results with total cost less than the manual solution by about 2%.","PeriodicalId":159365,"journal":{"name":"Engineering Research Journal (Shoubra)","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135806209","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-07-01DOI: 10.21608/erjsh.2023.207399.1163
Tarek Mustafa, Mohamed Makhlouf, Ahmed Elbakzawy, Maher Adam
: The flexural behavior of concrete beams reinforced with hybrid reinforcing schemes is investigated experimentally in this work. The effects of steel fibers inclusion on the flexural behavior of concrete beams reinforced using hybrid schemes were investigated using four half-scale beams. The steel fibers content (0.00%, 0.50%, and 1.00%) was the main important parameter. The experimental results demonstrated that steel fibers inclusion significantly improved the ultimate load, stiffness, and toughness of concrete beams. Load capacity was enhanced by 13% and 21% for steel fibers volume ratios of 0.50% and 1.00%, respectively. Toughness improvements were 97.7% and 161% for steel fibers volume ratios of 0.50% and 1.00%, respectively. A non-linear finite element analysis (NLFEA) was performed to simulate the flexural behavior of RC beams reinforced with hybrid schemes. The load-deflection responses and crack patterns of experimental specimens and numerical models were compared. The comparison showed a good agreement between the experimental and numerical results. The overall average value of the ratio between the experimental flexural capacities to the predicted capacities is about 0.94 and the standard deviation was of 0.028.
{"title":"Flexural Performance of Steel Fiber Concrete Beams Reinforced with Hybrid Schemes","authors":"Tarek Mustafa, Mohamed Makhlouf, Ahmed Elbakzawy, Maher Adam","doi":"10.21608/erjsh.2023.207399.1163","DOIUrl":"https://doi.org/10.21608/erjsh.2023.207399.1163","url":null,"abstract":": The flexural behavior of concrete beams reinforced with hybrid reinforcing schemes is investigated experimentally in this work. The effects of steel fibers inclusion on the flexural behavior of concrete beams reinforced using hybrid schemes were investigated using four half-scale beams. The steel fibers content (0.00%, 0.50%, and 1.00%) was the main important parameter. The experimental results demonstrated that steel fibers inclusion significantly improved the ultimate load, stiffness, and toughness of concrete beams. Load capacity was enhanced by 13% and 21% for steel fibers volume ratios of 0.50% and 1.00%, respectively. Toughness improvements were 97.7% and 161% for steel fibers volume ratios of 0.50% and 1.00%, respectively. A non-linear finite element analysis (NLFEA) was performed to simulate the flexural behavior of RC beams reinforced with hybrid schemes. The load-deflection responses and crack patterns of experimental specimens and numerical models were compared. The comparison showed a good agreement between the experimental and numerical results. The overall average value of the ratio between the experimental flexural capacities to the predicted capacities is about 0.94 and the standard deviation was of 0.028.","PeriodicalId":159365,"journal":{"name":"Engineering Research Journal (Shoubra)","volume":"8 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135806216","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-07-01DOI: 10.21608/erjsh.2023.196090.1150
Nadia Nofal, Gehan Hamdy, Hossam Hassan, Ali Shanour, Salma Saad
: This paper presents an experimental study of the flexural behavior of geopolymer concrete beams reinforced with steel and Glass Fiber-Reinforced Polymers (GFRP) bars in addition to two types of fibers in the mixture: steel fibers and polypropylene fibers. Ten beams divided into three groups were cast and experimentally tested under four-point bending up to failure. Mid-span deflection, strain at reinforcement bars, and crack pattern of the examined beams were recorded and analyzed. The results showed that the crack width and deflection at failure were notably reduced by increasing the reinforcement ratio of GFRP bars and steel bars. Reinforced geopolymer concrete beams showed enhancement of flexural capacity than normal reinforced concrete beams. Geopolymer concrete beams reinforced with steel bars achieved increment for ultimate load and corresponding deflection by 8.78%, and 114.66% respectively than normal concrete beams. In addition, the ultimate load and deflection of geopolymer concrete beams reinforced by glass fiber polymer bars showed an increase of 1.54%, and 25.53% respectively to normal concrete beams. For geopolymer concrete beams reinforced by steel bars while the reinforcement ratio raises from 0.48% to 0.58%, the ultimate load improved by 34.25% and while the reinforcement ratio raises from 0.58% to 0.68% the ultimate load improved by 3.75%. The addition of steel or polypropylene fibers to the mix increased the failure load of GFRP-reinforced geopolymer concrete beams by 10.49% and 8.10%.
{"title":"Experimental Investigation of the Flexural Behavior of Geopolymer Concrete Beams with Different Reinforcement Schemes","authors":"Nadia Nofal, Gehan Hamdy, Hossam Hassan, Ali Shanour, Salma Saad","doi":"10.21608/erjsh.2023.196090.1150","DOIUrl":"https://doi.org/10.21608/erjsh.2023.196090.1150","url":null,"abstract":": This paper presents an experimental study of the flexural behavior of geopolymer concrete beams reinforced with steel and Glass Fiber-Reinforced Polymers (GFRP) bars in addition to two types of fibers in the mixture: steel fibers and polypropylene fibers. Ten beams divided into three groups were cast and experimentally tested under four-point bending up to failure. Mid-span deflection, strain at reinforcement bars, and crack pattern of the examined beams were recorded and analyzed. The results showed that the crack width and deflection at failure were notably reduced by increasing the reinforcement ratio of GFRP bars and steel bars. Reinforced geopolymer concrete beams showed enhancement of flexural capacity than normal reinforced concrete beams. Geopolymer concrete beams reinforced with steel bars achieved increment for ultimate load and corresponding deflection by 8.78%, and 114.66% respectively than normal concrete beams. In addition, the ultimate load and deflection of geopolymer concrete beams reinforced by glass fiber polymer bars showed an increase of 1.54%, and 25.53% respectively to normal concrete beams. For geopolymer concrete beams reinforced by steel bars while the reinforcement ratio raises from 0.48% to 0.58%, the ultimate load improved by 34.25% and while the reinforcement ratio raises from 0.58% to 0.68% the ultimate load improved by 3.75%. The addition of steel or polypropylene fibers to the mix increased the failure load of GFRP-reinforced geopolymer concrete beams by 10.49% and 8.10%.","PeriodicalId":159365,"journal":{"name":"Engineering Research Journal (Shoubra)","volume":"19 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135806207","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-07-01DOI: 10.21608/erjsh.2023.195852.1149
Samer Beskales, Ibrahim Shahin, Samir Ayad, Osama Abdellatif, Tarek Mekhail
: Blade slots are known to reduce the noise and improve flow behavior and steadiness in centrifugal fans. The present work considers an unsteady Computational Fluid Dynamic (CFD) study to investigate the effectiveness of slot location and width on the performance and flow field inside the centrifugal fan blade passages. The computer program, Fluent 19, is used and the 3D fan model is validated by comparing its results with those of earlier researchers. The aim of the present study is to find the best slot location and appropriate slot width at that location. The flow pattern is then analyzed and simulated with no slot and with a slot at six different radial locations; namely S1, S2, S3, S4, S5, and S6 with fixed slot width W of 2.5 mm. The computationally generated characteristics of unsteady flow demonstrated that although cut slots at all locations on the fan blade from the hub to the shroud has a negative influence on the centrifugal fan efficiency as well as the static pressure rise compared with the fan without slot, the slots added at S3 i.e. near the midpoint of the blade span gives the highest fan efficiency and largest increase in static pressure. Slots at S3 suppress secondary flow at the blade passages and push it to the blade tip. Additionally, streamlines and velocity distributions in impeller passages and over the blade surfaces (pressure and suction sides) validated the slots' benefits. Computations width different slot width; namely 1.5 mm, 3.5 mm, and 5 mm are carried out to find the best slot location and width at the best slot location S3. At the optimal efficiency point, the calculated performance of the employed fan with slot location S3 and 2.5 mm width, showed a 2.7 % increase of efficiency and 1.5% increase in static pressure rise as compared to fans with slot at S1 with same width of 2.5 mm. However, it showed a positive impact on the boundary layer buildup and flow separation over the blade suction side for the impeller studied .
{"title":"Effect of Suction Slot Location and Width on the Performance of Centrifugal Fan","authors":"Samer Beskales, Ibrahim Shahin, Samir Ayad, Osama Abdellatif, Tarek Mekhail","doi":"10.21608/erjsh.2023.195852.1149","DOIUrl":"https://doi.org/10.21608/erjsh.2023.195852.1149","url":null,"abstract":": Blade slots are known to reduce the noise and improve flow behavior and steadiness in centrifugal fans. The present work considers an unsteady Computational Fluid Dynamic (CFD) study to investigate the effectiveness of slot location and width on the performance and flow field inside the centrifugal fan blade passages. The computer program, Fluent 19, is used and the 3D fan model is validated by comparing its results with those of earlier researchers. The aim of the present study is to find the best slot location and appropriate slot width at that location. The flow pattern is then analyzed and simulated with no slot and with a slot at six different radial locations; namely S1, S2, S3, S4, S5, and S6 with fixed slot width W of 2.5 mm. The computationally generated characteristics of unsteady flow demonstrated that although cut slots at all locations on the fan blade from the hub to the shroud has a negative influence on the centrifugal fan efficiency as well as the static pressure rise compared with the fan without slot, the slots added at S3 i.e. near the midpoint of the blade span gives the highest fan efficiency and largest increase in static pressure. Slots at S3 suppress secondary flow at the blade passages and push it to the blade tip. Additionally, streamlines and velocity distributions in impeller passages and over the blade surfaces (pressure and suction sides) validated the slots' benefits. Computations width different slot width; namely 1.5 mm, 3.5 mm, and 5 mm are carried out to find the best slot location and width at the best slot location S3. At the optimal efficiency point, the calculated performance of the employed fan with slot location S3 and 2.5 mm width, showed a 2.7 % increase of efficiency and 1.5% increase in static pressure rise as compared to fans with slot at S1 with same width of 2.5 mm. However, it showed a positive impact on the boundary layer buildup and flow separation over the blade suction side for the impeller studied .","PeriodicalId":159365,"journal":{"name":"Engineering Research Journal (Shoubra)","volume":"210 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135856321","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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