Iraqi Journal for Mechanical and Materials Engineering最新文献

INVESTIGATION OF VARIABLES GEOMETRY OF NOVEL PIN CORE-SANDWICH STRUCTURE ON UNSATURATED POLYESTER FLEXTURAL PROPERTIES 新型销芯夹芯结构变量几何对不饱和聚酯柔韧性能的影响研究

Iraqi Journal for Mechanical and Materials Engineering Pub Date : 2023-06-25 DOI: 10.32852/iqjfmme.v22i3.624

Meethaq M. Abed

{"title":"INVESTIGATION OF VARIABLES GEOMETRY OF NOVEL PIN CORE-SANDWICH STRUCTURE ON UNSATURATED POLYESTER FLEXTURAL PROPERTIES","authors":"Meethaq M. Abed","doi":"10.32852/iqjfmme.v22i3.624","DOIUrl":"https://doi.org/10.32852/iqjfmme.v22i3.624","url":null,"abstract":"Sandwich Structure with pin core is widely used in foam core for crushing, debonding and interfacial delamination prevention; this structure has manufactured by drilling foam core frequently. On the other hand, a novel method for manufacturing a pin core sandwich structure has been the aim of this research. Machinable wax panel was used to achieve cavities in form of pin within the core by drilling the wax panel by CNC-drilling machine then casting of thermoset resin (unsaturated polyester resin) into a wax mold, after that melting of the wax mold to get pin core sandwich structure. Complex structure can't be designed by conventional method but by this method allows to design such complex structures: spheres, pyramids, ellipse…etc. According to Response Surface Methodology method, fifteen specimens were achieved and three variables were investigated to get optimization and prediction model. The results show that 300% improvement of stiffness performance index with 40% weight reduction comparative to reference sample with 4.46 GPa0.5 cm3 g-1 optimal value for the specimen ((High=11mm), (Diameter=9 mm) and (Pin-to-Pin distance=4.3 mm)). Strength performance index improvement is 126% and 50% weight reduction comparative to reference sample with 35.9 MPa2/3 cm3 g-1 optimal value for the specimen ((High=11mm), (Diameter=6.115 mm) and Pin-to-Pin distance=1.5 mm)). ANOVA analysis shows that the pin height (H) is effective parameter on stiffness property. On the other hand, the height and diameter of the pin are effective parameters on strength property. \u0000 \u0000 ","PeriodicalId":31812,"journal":{"name":"Iraqi Journal for Mechanical and Materials Engineering","volume":"1 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-06-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"46619363","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 AND NUMERICAL ANALYSIS OF NEW CURVED CONFIGURATION OF HEAT SINKS 新型曲面散热器的实验与数值分析

Iraqi Journal for Mechanical and Materials Engineering Pub Date : 2023-06-25 DOI: 10.32852/iqjfmme.v22i3.625

Hiba K. Mohsen, N. Hamza

引用次数: 0

REVIEW OF THE EFFECT OF OCCUPIED DENSITY WITH MIXING VENTILATION ON THERMAL HUMAN COMFORT AND INDOOR AIR QUALITY 混合通风密度对热舒适性和室内空气质量影响的研究进展

Iraqi Journal for Mechanical and Materials Engineering Pub Date : 2022-07-01 DOI: 10.32852/iqjfmme.v22i2.596

Atheer Hamza Saber, Ala'a Abbas Mahdi, Mohammed Wahhab. Aljibory

{"title":"REVIEW OF THE EFFECT OF OCCUPIED DENSITY WITH MIXING VENTILATION ON THERMAL HUMAN COMFORT AND INDOOR AIR QUALITY","authors":"Atheer Hamza Saber, Ala'a Abbas Mahdi, Mohammed Wahhab. Aljibory","doi":"10.32852/iqjfmme.v22i2.596","DOIUrl":"https://doi.org/10.32852/iqjfmme.v22i2.596","url":null,"abstract":"In this study many researches related to mixing and displacement ventilations in indoor and office rooms were addressed. Good ventilation is one of the most important requirements for space occupants to maintain appropriate environmental conditions, as ventilation increases thermal comfort and improves indoor air quality. However, the studies on mixing ventilation systems based on occupied density have been highlighted in the present work. Improvement of the indoor environment is economically efficient when health and productivity are taken into account. The parts of a room that a person occupies must be characterized by speed and air temperatures suitable for the occupants of the space. In the occupied zone, fresh, clean supply air must reach all its parts, and no stagnation areascan be found there. A group of field studies conducted showed, significant levels ofdissatisfaction with the indoor environment in many buildings despite satisfying the typical ventilation requirements, where there are still many complaints regarding poor indoor air quality and diseases related to poor ventilation of buildings. In enclosed spaces, ventilation is one of the essential methods used to control indoor air quality (IAQ). In buildings, ventilation has an impact on the structure and, as a result, on the people who utilize it. A deteriorated indoor environment increases sick building syndrome (SBS), respiratory illnesses, and reduces comfort and productivity.","PeriodicalId":31812,"journal":{"name":"Iraqi Journal for Mechanical and Materials Engineering","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2022-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"43207454","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

EFFECT OF GEOMETRICAL AND OPERATIONAL PARAMETER ON OIL-WATER SEPARATION IN AXIAL INLET HYDROCYCLONE 几何参数和操作参数对轴向进口水力旋流器油水分离的影响

Iraqi Journal for Mechanical and Materials Engineering Pub Date : 2022-07-01 DOI: 10.32852/iqjfmme.v22i2.597

Karima Esmail Amori, Zainab H. Ubaise Al-Ammar

{"title":"EFFECT OF GEOMETRICAL AND OPERATIONAL PARAMETER ON OIL-WATER SEPARATION IN AXIAL INLET HYDROCYCLONE","authors":"Karima Esmail Amori, Zainab H. Ubaise Al-Ammar","doi":"10.32852/iqjfmme.v22i2.597","DOIUrl":"https://doi.org/10.32852/iqjfmme.v22i2.597","url":null,"abstract":"To overcome the high water content in numerous oil fields, axial inlet hydrocyclone is considered an alternative device of oil-water separation technique that is used downfield. This type of hydrocyclone has a rare previous work compared to other vortex tube separators. Additionally, the accurate mechanism of the enhanced separation process by optimizing the separation technologies remains unclear. Therefore, an extensive study was conducted to expand the application range of the axial inlet hydrocyclone. This workpresents a literature review of the different separation technologies for the axial inlethydrocyclone. These are categorized into two groups: (i) geometrical parameters including, internal swirl element (ISE), swirl chamber, and (ii) operational parameters including, inlet flow rate, feed temperature, mixture fraction, and droplet size. The influence of these parameters on the velocity components profile and pressure drop were analyzed based on the separation performance parameters such as separation efficiency and pressure drop. This work could serve as an engineering tool that results in the enhanced economic workability of separation by hydrocyclone.","PeriodicalId":31812,"journal":{"name":"Iraqi Journal for Mechanical and Materials Engineering","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2022-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"48728912","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

STUDY ОF PRESSURE DROP AND HEАT TRANSFER CHARACTERISTICS ОF MINI-CHANNEL HEАT SINKS 研究Оf压降和heАt传递特性Оf迷你通道heАt水槽

Iraqi Journal for Mechanical and Materials Engineering Pub Date : 2022-07-01 DOI: 10.32852/iqjfmme.v22i2.595

Raed Shakir

{"title":"STUDY ОF PRESSURE DROP AND HEАT TRANSFER CHARACTERISTICS ОF MINI-CHANNEL HEАT SINKS","authors":"Raed Shakir","doi":"10.32852/iqjfmme.v22i2.595","DOIUrl":"https://doi.org/10.32852/iqjfmme.v22i2.595","url":null,"abstract":"Predictions оn micro-scale оf hеаt sinks beneath the conditions оf hеаt flux wasimplementеd tо study the properties оf hеаt transfer. А copper plate with dimensions of (50mm* 50mm) and (10 mm) in thickness, wаs subsequently developеd as a square plate hеаt sinks along with 25 mini-channel. Each channel hаs (1 mm) height and (1 mm) width using а machine оn wire оf electrical evacuation. Effects оf various hеаt sinks factors, such as the mini-scale оf complex sinks and hеаt flow оf hеаt transfer properties wereconsidered. Аn iteration process bу excel software was used tо obtain the wall and the fluidtemperatures, the Reynolds numbеr at the inlet and outlet of the channels, the coefficient оf hеаt transfer, and the pressure drop. The predictions were implementеd fоr the Reynolds numbеr and pressure drop in the ranges оf (1014. 23–3272.56) and (1.90–11.66) mbar, respectively аs well аs the results fоr inlet and outlet Nusselt numbеr ranges (4.27 - 5.75) and (3.92 - 4.92) respectively. The studied mechanism оf hеаt transfer fоr micro-scale оf complex geometry showed that the micro-scale arrangement hаs а substantial effect оn the enhancement оf hеаt flow of transmission parameters, sо that the results of these investigations are expected to be used in the design of mini-heat exchangers used in electronic devices. Air dаtа were obtained using suitable hеаt transfer equations which arevery comparable tо real lаb tests under steady-state conditions.","PeriodicalId":31812,"journal":{"name":"Iraqi Journal for Mechanical and Materials Engineering","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2022-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"44315586","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

ANA LYSIS OF THE FLOW AND THERMAL FIELDS IN BOBTAIL ROOFS HEATED FROM THE BASE WALL 底墙加热短尾屋顶的流场和热场分析

Iraqi Journal for Mechanical and Materials Engineering Pub Date : 2022-04-02 DOI: 10.32852/iqjfmme.v22i1.581

O. Kamiyo

{"title":"ANA LYSIS OF THE FLOW AND THERMAL FIELDS IN BOBTAIL ROOFS HEATED FROM THE BASE WALL","authors":"O. Kamiyo","doi":"10.32852/iqjfmme.v22i1.581","DOIUrl":"https://doi.org/10.32852/iqjfmme.v22i1.581","url":null,"abstract":"Analysis of airflow and thermal characteristics of attics of bobtail-shaped pitched roofs heated through a horizontally suspended ceiling is numerically carried out in this study. Pitch angles of 14o, 18o, 30o, and 45o within the standard pitch roof range are selected. The configuration falls within Rayleigh number 3.19 x 105  Ra  2.04 x 107. A finite-volume CFD code was used to solve the mass, momentum, and energy conservation equations governing the problem. The results obtained indicate a strong influence on the shape and angle of the roof. At lower roof pitches, the flow field is characterized by multiple counter-rotating vortices asymmetrically arranged within the enclosures. Eight cells in the 14o enclosure were reduced to five in the 45o roof pitch. The size and rotating strength of a vortex increase from the left corner to the middle of the enclosures. At higher pitch angles, the vertical wall obstructed the flow leading to a number of distorted cells. The maximum velocity within the aerodynamic boundary layer along the base wall occurs at Y=0.02 with the values U=0.013 and U=0.028 in the 14o and 45o enclosures respectively. The thermal field portrays a convection system of rising hot plumes from the base wall and descending cold jets from the inclined walls; all enclosed by thin boundary layers along the walls. Graphical plots of velocity and temperature variations along some cross-sections within the enclosures enable the prediction of some important heat and flow parameters. \u0000 ","PeriodicalId":31812,"journal":{"name":"Iraqi Journal for Mechanical and Materials Engineering","volume":"1 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2022-04-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"41361545","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

NONISOTHERMAL SIMULATION OF ELECTRODEPOSITION 电沉积过程的非等温模拟

Iraqi Journal for Mechanical and Materials Engineering Pub Date : 2022-04-02 DOI: 10.32852/iqjfmme.v22i1.586

Tahseen A. Al-Hattab, Sata K. Ajjam

引用次数: 0

EFFECT OF ELECTROMAGNETIC FIELD ON THE THERMAL EFFICIENCY OF CONCENTRATED SOLAR COLLECTOR (EXPERIMENTAL STUDY) 电磁场对集热器热效率的影响(实验研究)

Iraqi Journal for Mechanical and Materials Engineering Pub Date : 2022-04-02 DOI: 10.32852/iqjfmme.v22i1.584

Karima E. Amori, Dheyaa A. Khalaf, Firas M. Tuaimah

引用次数: 0

SYNT The Iraqi Journal for Mechanical and Material Engineering, Vol.22, No1,March,2022 HETIC FIBERS EFFECT ON PMMA COMPOSITES USED IN DENTURE FABRICATION: FLEXURAL AND IMPACT STRENGTH EVALUATION 机械与材料工程学报，Vol.22, no . 1, 2022 .聚甲基丙烯酸甲酯复合材料在义齿制造中的应用

Iraqi Journal for Mechanical and Materials Engineering Pub Date : 2022-04-02 DOI: 10.32852/iqjfmme.v22i1.582

Hassan A.Sharhan, Jawad K. Oleiwi, Zaynab N. Rasheed Alraziqi

{"title":"SYNT The Iraqi Journal for Mechanical and Material Engineering, Vol.22, No1,March,2022 HETIC FIBERS EFFECT ON PMMA COMPOSITES USED IN DENTURE FABRICATION: FLEXURAL AND IMPACT STRENGTH EVALUATION","authors":"Hassan A.Sharhan, Jawad K. Oleiwi, Zaynab N. Rasheed Alraziqi","doi":"10.32852/iqjfmme.v22i1.582","DOIUrl":"https://doi.org/10.32852/iqjfmme.v22i1.582","url":null,"abstract":"PMMA (poly-methyl methacrylate) acrylic resin is commonly utilized in the manufacture of denture bases. However, its mechanical characteristics may be inadequate for this purpose. The purpose of this research is to look at the mechanical characteristics (flexural strength, flexural modulus, impact strength, fracture toughness) of PMMA composite by adding two kinds of synthetic fibers Polypropylene (PP) and Polyacrylonitrile (PAN). Numbers of PMMA composite samples were generated at specified weight ratios of (1.5, 3.5, 5.5, and 7.5 wt.%) in this study. Research results showed that during fibers ratio increased until max. point (7.5wt. %), a decrease in flexural strength value was observed. Notably, PMMA/PAN composite sample has more influence than PMMA/ PP composite. Also, a decrease in the flexural modulus during fibers ratio increases until maximum (7.5wt. %), flexural modulus for PMMA/PAN composite were higher than the values PMMA/PP composite specimens. When it came to I.S, it was discovered that when the fiber ratios were raised, the impact strength rose at a ratio (7.5wt. %). Finally, the results of fracture toughness showed an improvement for the composite specimen (PMMA/7.5 wt. % PAN fiber). In contrast to (the PMMA/7.5wt.% PP fiber) composite specimen, there was a decrease compared to the neat sample.","PeriodicalId":31812,"journal":{"name":"Iraqi Journal for Mechanical and Materials Engineering","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2022-04-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"46946366","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

STABILITY AND DYNAMIC ANALYSES OF PIPE CONVEYED FLUID STIFFENED BY LINEAR STIFFNESS ELEMENT USING FINITE ELEMENTS METHOD 用有限元法进行线性刚度单元加筋管道输送流体的稳定性和动力分析

Iraqi Journal for Mechanical and Materials Engineering Pub Date : 2022-04-02 DOI: 10.32852/iqjfmme.v22i1.585

Salwan O. Waheed

引用次数: 0