Iraqi Journal for Mechanical and Materials Engineering最新文献_第3页

THE INFLUENCE OF STIRRER ON THE DRYING OF WHEAT PARTICLES IN A FLUIDIZED BED AT LOW AIR VELOCITY 搅拌器对低风速流化床中小麦颗粒干燥的影响

Iraqi Journal for Mechanical and Materials Engineering Pub Date : 2021-09-29 DOI: 10.32852/iqjfmme.v21i3.559

Russul A. Kadhim, Ekhlas M. Fayyadh, Sadeq H. Bakhy

引用次数: 0

EFFECT OF ALUMINUM CONTENT ON THE HARDNESS AND MACHINABILITY OF BRASS ALLOY USED IN OXYGEN CYLINDER VALVE 铝含量对氧气瓶阀用黄铜合金硬度和可加工性的影响

Iraqi Journal for Mechanical and Materials Engineering Pub Date : 2021-09-29 DOI: 10.32852/iqjfmme.v21i3.562

Hassanein Ibraheem Khalaf

{"title":"EFFECT OF ALUMINUM CONTENT ON THE HARDNESS AND MACHINABILITY OF BRASS ALLOY USED IN OXYGEN CYLINDER VALVE","authors":"Hassanein Ibraheem Khalaf","doi":"10.32852/iqjfmme.v21i3.562","DOIUrl":"https://doi.org/10.32852/iqjfmme.v21i3.562","url":null,"abstract":"There is high consumption of oxygen cylinder valves due to incorrect application of valves, therefore, this research will study the possibility to modify Brass alloy that used to produce cylinder valves and reduce their erosion that happens under the use of valve. The main type of brass that used to make cylinder valve is CW713R which contained aluminum with percentage of 1.3-2.3% with hardness of 174 HV. Therefore, the effect of aluminum element on the properties of brass alloy will study to find the best and the optimum percentages that can be added to improve the hardness and machinability of cylinder valve. Brass scrap was melted using oil fire furnace and aluminum element was added before it cast. Then, the melting liquid was poured on steel die casting mold. The result shows that the hardness Brass cylinder valve was increased by increasing the percentage of aluminum element. It is raised from 206 to 605 HV. But when the percentage of aluminum reached 10 % the Brass material becomes brittle and difficult to machine. The best percentage of aluminum that can be added to brass alloy lies in the range of 2.5 – 5%.","PeriodicalId":31812,"journal":{"name":"Iraqi Journal for Mechanical and Materials Engineering","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2021-09-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"49350289","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}

引用次数: 0

CORROSION INHIBITION OF CARBON STEEL IN HYDROCHLORIC ACID 碳钢在盐酸中的缓蚀作用

Iraqi Journal for Mechanical and Materials Engineering Pub Date : 2021-09-29 DOI: 10.32852/iqjfmme.v21i3.561

Falah Kaify Matloub

引用次数: 0

EXHAUST GAS RECIRCULATION EFFECT ON COMBUSTION AND EMITTED NOX IN A SPARK IGNITION ENGINE USING HIGH OCTANE NUMBER FUEL 高辛烷值燃料火花点火式发动机排气再循环对燃烧和NOX排放的影响

Iraqi Journal for Mechanical and Materials Engineering Pub Date : 2021-06-30 DOI: 10.32852/iqjfmme.v21i2.545

N. Hassan, Adel M. Saleh

引用次数: 0

FABRICATION AND CHARACTERIZATION OF LTCC BASED ON TALK GLASSES 基于TALK玻璃的LTCC的制备与表征

Iraqi Journal for Mechanical and Materials Engineering Pub Date : 2021-06-30 DOI: 10.32852/iqjfmme.v21i2.550

Farhad M. O. Kushnaw

引用次数: 0

KINEMATICS ANALYSIS AND IMPLEMENTATION OF THREE DEGREES OF FREEDOM ROBOTIC ARM BY USING MATLAB 基于MATLAB的三自由度机械臂运动学分析与实现

Iraqi Journal for Mechanical and Materials Engineering Pub Date : 2021-06-30 DOI: 10.32852/iqjfmme.v21i2.547

Hasan Dawood Salman, Mohsin Noori Hamzah, Sadeq Hussein Bakhy

{"title":"KINEMATICS ANALYSIS AND IMPLEMENTATION OF THREE DEGREES OF FREEDOM ROBOTIC ARM BY USING MATLAB","authors":"Hasan Dawood Salman, Mohsin Noori Hamzah, Sadeq Hussein Bakhy","doi":"10.32852/iqjfmme.v21i2.547","DOIUrl":"https://doi.org/10.32852/iqjfmme.v21i2.547","url":null,"abstract":"The kinematics modeling of the robot arm plays an important role in robot control. This paper presents the kinematic model of a three-degree of freedom articulated robot arm, which is designed for picking and placing an application with hand gripper, where a robot has been manufactured for that purpose. The forward kinematic model has been presented in order to determine the end effector’s poses using the Denavit-Hartenberg (DH) convention. For inverse kinematics, an algebraic solution based on trigonometric formulas mixed with geometric method was adopted for a 3 DOF modular manipulator taking into account the existence of a shoulder offset. MATLAB software was used as a tool to simulate and implement the motional characteristics of the robot arm, by creating a 3D visual software package under designing a Graphical User Interface \"GUI\" with a support simulation from robotic Toolbox (Rtb 10.3). Finally, an electronic interfacing circuit between the GUI program and the robot arm was developed using Arduino microcontroller to control the robot motion. The presented work can be applicable for learning the reality interface design methodology of the other kinds of robot manipulators and achieve a suitable solution for the motional characteristics","PeriodicalId":31812,"journal":{"name":"Iraqi Journal for Mechanical and Materials Engineering","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2021-06-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"42738111","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}

引用次数: 1

EXPERIMENTAL STUDY OF HEAT TRANFER AUGMENTATION USING AIR BUBBLE INJECTION AND (Al2O3 /WATER) NANOFLUID FLOW IN DOUBLE PIPE HEAT EXCHANGERS 气泡注入和(氧化铝/水)纳米流体在双管换热器中强化传热的实验研究

Iraqi Journal for Mechanical and Materials Engineering Pub Date : 2021-06-30 DOI: 10.32852/iqjfmme.v21i2.546

Dhirgham A. Alkhafaji, Hameed K. Hamzah, Haider S. Hadi

{"title":"EXPERIMENTAL STUDY OF HEAT TRANFER AUGMENTATION USING AIR BUBBLE INJECTION AND (Al2O3 /WATER) NANOFLUID FLOW IN DOUBLE PIPE HEAT EXCHANGERS","authors":"Dhirgham A. Alkhafaji, Hameed K. Hamzah, Haider S. Hadi","doi":"10.32852/iqjfmme.v21i2.546","DOIUrl":"https://doi.org/10.32852/iqjfmme.v21i2.546","url":null,"abstract":"In the present work, an experimental study on how to increase the heat transfer coefficient (HTC) in double pipe heat exchanger (DPHE) use of a variety of Al2O3 Nano-dispersion concentrations mixed in water as base fluid with air bubble injection for counter flow arrangement under turbulent flow conditions with (Re) Reynold number range from (6000 t0 45000) . The thermal performance of (DPHE) has been enhanced with the use of two techniques. The first, is represented by adding nanoparticles to hot water (inner pipe) raising the (HTC) inside the inner tube. Increase the volume concentration cause increase in the viscosity of the nanofluid leading to increase in friction factor .Secondly is represented by Air bubble injection in outer pipe with cold water to enhance the (HTC). The mobility of air bubbles inside the water from down to up by the force of the buoyancy, and the movement of these air bubbles results in significant mixture and turbulence within the water. The variations of number of thermal units (NTU), exergy loss, dimensionless exergy and (Nu) are evaluated. The investigated parameters were cold water volume flow rates (8, 10, 12 and14) l/min, flow in outer tube. Also, three different volume flow rates of air (12, 16 and 20) l/min mixed with water in outer tube. The volume flow rates of hot water remains constant at (8 l/min) flow in inner pipe with three volumetric concentrations of given nanofluid. The results showed that the air bubble injection throughout the tube gave maximum enhancement in heat transfer characteristics followed by the no air bubble injection. Since the enhancement in heat transfer characteristics varies linearly with the volumetric concentration of Nanofluids, Nanofluids with 0.3% of Al2O3 nanoparticles gave more enhancements in (HTC) than the case without nanofluid. The Nusselt number increased about (8% - 45%). \u0000 ","PeriodicalId":31812,"journal":{"name":"Iraqi Journal for Mechanical and Materials Engineering","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2021-06-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"46493005","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}

引用次数: 0

EXPERIMENTAL INVESTIGATION AND CFD SIMULATION OF INDOOR AIR QUALITY IN ROOM USING IMPINGING JET VENTILATION SYSTEM AT DIFFERENT OCCUPANT DISTRIBUTION 撞击射流通风系统在不同人员分布下室内空气质量的实验研究及CFD模拟

Iraqi Journal for Mechanical and Materials Engineering Pub Date : 2021-06-30 DOI: 10.32852/iqjfmme.v21i2.548

Ala'a Abbas Mahdi, S. Mohammed Abbas

{"title":"EXPERIMENTAL INVESTIGATION AND CFD SIMULATION OF INDOOR AIR QUALITY IN ROOM USING IMPINGING JET VENTILATION SYSTEM AT DIFFERENT OCCUPANT DISTRIBUTION","authors":"Ala'a Abbas Mahdi, S. Mohammed Abbas","doi":"10.32852/iqjfmme.v21i2.548","DOIUrl":"https://doi.org/10.32852/iqjfmme.v21i2.548","url":null,"abstract":"The current paper reports the analysis and design of air quality and human thermal comfort in rooms using impinging jet ventilation system at different occupant distribution. Theoretical and experimental studies at different situations of occupant distribution used the square cross sectional supply air duct with height from the foot level end (0.1h). This work presents a numerical study for predicting the indoor airflow and temperature distribution by adopting impinging jet ventilation system in office room. The emergence of the three zones flow field of an impinging jet is mostly divided into three distinguished zones: impingement zone, wall jet zone and free jet zone which produce excessive kinetic energy at the stagnation zone and distribute approximately in the longitudinal and lateral directions over the floor. Acceptable Air Distribution Performance Index (ADPI), effective temperature and ventilation efficiency were found at situations of occupant distribution (when the occupant located at the center of the room one sitting in front of the other gives optimum human thermal comfort if compared with the other situations of occupant distributions).","PeriodicalId":31812,"journal":{"name":"Iraqi Journal for Mechanical and Materials Engineering","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2021-06-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"42482544","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}

引用次数: 0

ENHANCEMENT OF HEAT TRANSFER IN DOUBLE PIPE HEAT EXCHANGER USING AL2O3-FE2O3/WATER HYBRID NANOFLUID AL2O3-FE2O3/水混合纳米流体增强双管换热器的传热性能

Iraqi Journal for Mechanical and Materials Engineering Pub Date : 2021-06-30 DOI: 10.32852/iqjfmme.v21i2.549

Mawj K. Qasim, Hadi O. Basher, Mohammed D. Salman

{"title":"ENHANCEMENT OF HEAT TRANSFER IN DOUBLE PIPE HEAT EXCHANGER USING AL2O3-FE2O3/WATER HYBRID NANOFLUID","authors":"Mawj K. Qasim, Hadi O. Basher, Mohammed D. Salman","doi":"10.32852/iqjfmme.v21i2.549","DOIUrl":"https://doi.org/10.32852/iqjfmme.v21i2.549","url":null,"abstract":"This study aims to enhancement of heat transfer in double pipe heat exchanger by improving the thermal properties of base fluid which is water by adding AL2O3-Fe2O3 nanoparticles to the water. Al2O3-Fe2O3/water hybrid Nanofluid were examined experimentally and numerically at different flow rates ranging between (3 -7) Lpm at temperature of 25°C in an external tube while there was a hot water at a temperature of 60°C and a flow rate ranged between (3 – 5) Lpm running in the central tube of a double pipe counter heat exchanger. Also, the effect of various concentrations ranged between (0.05, 0.1, 0.15, 0.2, 0.25 and 0.3%) of Al2O3-Fe2O3 nanoparticles dispersed in water on the rate of heat transfer, friction coefficient were verified experimentally and numerically . The ratio of Al2O3-Fe2O3 is 0.5:0.5. The experimental and numerical study indicated that with the rate of heat transfer increases when the concentration of suspended nanoparticles in the base fluid increases , but on the other hand, the skin friction coefficient and pressure drop increases as well with increasing the concentration of nanoparticles. The maximum enhancement in heat transfer for AL2O3-Fe2O3 is about 6 % . The results from the experimental study were largely consistent with the numerical results.","PeriodicalId":31812,"journal":{"name":"Iraqi Journal for Mechanical and Materials Engineering","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2021-06-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"48521466","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}

引用次数: 1

EFFECT OF FORMING TOOLS NOSE ON THE FORMABILITY OF SINGLE POINT INCREMENTAL SHEET FORMING. 成形刀头对单点增量板料成形性能的影响。

Iraqi Journal for Mechanical and Materials Engineering Pub Date : 2021-04-03 DOI: 10.32852/iqjfmme.v21i1.534

Entesar Nayyef Farhan

引用次数: 0