International journal of engineering. Transactions A: basics最新文献_第2页

Random Vortex Method for Geometries with Unsolvable Schwarz-Christoffel Formula 具有不可解Schwarz-Christoffel公式的几何的随机涡方法

International journal of engineering. Transactions A: basics Pub Date : 2017-11-30 DOI: 10.5829/ije.2018.31.01a.06

I. T. Navaei, B. Zafarmand

{"title":"Random Vortex Method for Geometries with Unsolvable Schwarz-Christoffel Formula","authors":"I. T. Navaei, B. Zafarmand","doi":"10.5829/ije.2018.31.01a.06","DOIUrl":"https://doi.org/10.5829/ije.2018.31.01a.06","url":null,"abstract":"In this research we have implemented the Random Vortex Method to calculate velocity fields of fluids inside open cavities in both turbulent and laminar flows. the Random Vortex Method is a CFD method (in both turbulent and laminar fields) which needs the Schwarz-Christoffel transformation formula to map the physical geometry into the upper half plane. In some complex geometries like the flow inside cavity, the Schwarz-Christoffel mapping which transfers the cavity into the upper half plane cannot be achieved easily. In this paper, the mentioned mapping function for a square cavity is obtained numerically. Then, the instantaneous and the average velocity fields are calculated inside the cavity using the RVM. Reynolds numbers for laminar and turbulent flows are 50 and 50000, respectively. In both cases, the velocity distribution of the model is compared with the FLUENT results that the results are very satisfactory. Also, for aspect ratio the cavity (α) equal 2, the same calculation was done for Re=50 and 50000. The advantage of this modelling is that for calculation of velocity at any point of the geometry, there is no need to use meshing in all of the flow field and the velocity in a special point can be obtained directly and with no need to the other points.","PeriodicalId":416886,"journal":{"name":"International journal of engineering. Transactions A: basics","volume":"8 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2017-11-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128722773","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 Investigation of Energy Consumption and Performance of Reverse Osmosis Desalination using Design of Experiments Method 用实验设计法研究反渗透海水淡化的能耗和性能

International journal of engineering. Transactions A: basics Pub Date : 2017-11-30 DOI: 10.5829/ije.2018.31.01a.12

M. Kazemian, S. Ebrahimi-Nejad, M. Jaafarian

{"title":"Experimental Investigation of Energy Consumption and Performance of Reverse Osmosis Desalination using Design of Experiments Method","authors":"M. Kazemian, S. Ebrahimi-Nejad, M. Jaafarian","doi":"10.5829/ije.2018.31.01a.12","DOIUrl":"https://doi.org/10.5829/ije.2018.31.01a.12","url":null,"abstract":"To control the quality of reverse osmosis (RO) product water and reduce operational costs and environmental impacts by increasing the system’s energy efficiency, it is necessary to identify the influence of process parameters on energy consumption and permeate water quality. This paper introduces a case study focused on the application of Design of Experiments (DOE) method in an industrial-scale RO desalination plant. In this study, energy consumption and permeate water salinity are formulated in terms of system design (the number of membranes and system recovery rate) and flow parameters (feed water flow rate, alkalinity, thermal effects, and salinity). Findings indicate that energy consumption decreases by increasing feed water temperature and the number of membranes. Moreover, increasing feed water flow rate and alkalinity leads to higher quality permeate water (lower salinity), whereas, increasing the number of membranes and system recovery rate and higher feed water temperature and salinity, increases the salinity of permeate water. The findings provide insight into the RO process features and can help designers and operators achieve a higher energy efficiency and better performance in the design and operation of RO units and the presented solution can be built into systems for comprehensive techno-economic evaluation of RO-based processes to consider changes in effective parameters.","PeriodicalId":416886,"journal":{"name":"International journal of engineering. Transactions A: basics","volume":"30 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2017-11-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126622101","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: 12

Adsorption of Malachite Green from Aqueous Solution by Nanozeolite Clinoptilolite: Equilibrium, Kinetic and Thermodynamic Studies 斜沸石对孔雀石绿的吸附:平衡、动力学和热力学研究

International journal of engineering. Transactions A: basics Pub Date : 2017-11-30 DOI: 10.5829/ije.2018.31.01a.01

R. Heydari, M. Khavarpour

{"title":"Adsorption of Malachite Green from Aqueous Solution by Nanozeolite Clinoptilolite: Equilibrium, Kinetic and Thermodynamic Studies","authors":"R. Heydari, M. Khavarpour","doi":"10.5829/ije.2018.31.01a.01","DOIUrl":"https://doi.org/10.5829/ije.2018.31.01a.01","url":null,"abstract":"The object of present study was to examine the adsorption potential of nanozeolite clinoptilolite (CP) for the removal of malachite green (MG) from aqueous phase in a batch equilibrium system. SEM, EDX, XRF, XRD and FT-IR techniques of characterization of zeolite were applied. The effects of initial pH solution, adsorbent dose, temperature, contact time and initial MG concentration on adsorption were evaluated. Adsorption experiments were conducted at initial concentrations in the range of 10–50 mg/L and temperatures at 25, 30 and 35°C. MG adsorption uptake was found to increase with an increase in contact time, initial MG concentration and solution temperature. The adsorption equilibrium data revealed the best fit with Koble-Corrigan model. The kinetics of MG on adsorbent followed the pseudo-second-order model. In addition, the assessment of kinetic data depicted that the adsorption rate was controlled by intraparticle diffusion mechanism. The negative values of standard Gibbs free energy represented the spontaneous adsorption at the stated temperature. The positive values of enthalpy and entropy changes also confirmed the increased randomness and endothermic nature of MG adsorption on nanozeolite CP adsorbent. Furthermore, the obtained activation energy showed the physical adsorption process.","PeriodicalId":416886,"journal":{"name":"International journal of engineering. Transactions A: basics","volume":"34 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2017-11-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121441247","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: 4

The Effects of Newmark Method Parameters on Errors in Dynamic Extended Finite Element Method Using Response Surface Method 响应面法动态扩展有限元法中Newmark方法参数对误差的影响

International journal of engineering. Transactions A: basics Pub Date : 2017-11-30 DOI: 10.5829/ije.2018.31.01a.08

Y. Karimi, S. Rashahmadi, R. Hasanzadeh

{"title":"The Effects of Newmark Method Parameters on Errors in Dynamic Extended Finite Element Method Using Response Surface Method","authors":"Y. Karimi, S. Rashahmadi, R. Hasanzadeh","doi":"10.5829/ije.2018.31.01a.08","DOIUrl":"https://doi.org/10.5829/ije.2018.31.01a.08","url":null,"abstract":"The Newmark method is an effective method for numerical time integration in dynamic problems. The results of Newmark method are function of its parameters (β, γ and ∆t). In this paper, a stationary mode I dynamic crack problem is coded in extended finite element method )XFEM( framework in Matlab software and results are verified with analytical solution. This paper focuses on effects of main parameters in Newmark method for dynamic XFEM problems. Also use of the response surface method (RSM) a regression model is presented for estimating error of dynamic stress intensity factors (DSIF) with high validity according to results of analysis of variance (ANOVA). This work enables one to understand the effect of Newmark parameters on error of DSIFs and to find optimum β and γ for a determined number of time steps (N). This procedure is highly effective in order to manage the computational cost and enhance the accuracy at the desired domain. The effect of the considered parameters on error, is investigated using RSM in Minitab software and optimum state for minimization of errors is illustrated.","PeriodicalId":416886,"journal":{"name":"International journal of engineering. Transactions A: basics","volume":"48 4 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2017-11-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125724337","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: 4

Proposed Procedure for Estimating the Coefficient of Three-factor Interaction for 2^p 3^m 4^q Factorial Experiments (TECHNICAL NOTE) 估计2^p 3^m 4^q析因实验中三因素相互作用系数的建议程序(技术说明)

International journal of engineering. Transactions A: basics Pub Date : 2017-11-30 DOI: 10.5829/ije.2018.31.01a.02

W. A. A. Alqraghuli, A. Alkarkhi, Y. Yusup

引用次数: 1

Flexural and Impact Properties of Stainless Steel based Glass Fibre Reinforced Fibre Metal Laminate under Hygrothermal Conditioning 湿热条件下不锈钢基玻璃纤维增强金属纤维层压板的弯曲和冲击性能

International journal of engineering. Transactions A: basics Pub Date : 2017-11-30 DOI: 10.5829/ije.2018.31.01a.22

S. Singh, Surjit Angra

{"title":"Flexural and Impact Properties of Stainless Steel based Glass Fibre Reinforced Fibre Metal Laminate under Hygrothermal Conditioning","authors":"S. Singh, Surjit Angra","doi":"10.5829/ije.2018.31.01a.22","DOIUrl":"https://doi.org/10.5829/ije.2018.31.01a.22","url":null,"abstract":"Fibre metal laminates (FMLs) have appeared as the most suitable materials for shipbuilding, aeronautical and aerospace applications due to their superior mechanical properties over traditional materials. In this paper, degradation in flexural and impact properties of glass fibre/epoxy composite (GF/E composite) and stainless steel glass fibre/epoxy fibre metal laminate (SS FML) due to hygrothermal conditioning has been investigated for marine applications. Hand lay-up process was used for specimen preparation according to ASTM standards. Distilled water and seawater were used for hygrothermal conditioning at 40°C and 70°C for three months. The three point bend test was performed on universal testing machine using a three point bend fixture. The pendulum type impact testing machine was used to perform Izod impact test. Due to the preventive action of outer stainless steel layers against moisture ingestion, the reduction in mechanical properties of SS FML was less as compared to GF/E composite. SS FML and GF/E composite exhibited low moisture absorption rate in seawater at both temperatures as high salt content in seawater reduces the moisture diffusion process into the composite matrix.","PeriodicalId":416886,"journal":{"name":"International journal of engineering. Transactions A: basics","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2017-11-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129112663","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: 8

Multiple Destination Influence on Production Scheduling in Multi-element Mines 多目标对多要素矿山生产调度的影响

International journal of engineering. Transactions A: basics Pub Date : 2017-11-30 DOI: 10.5829/ije.2018.31.01a.23

M. Jamshidi, M. Osanloo

{"title":"Multiple Destination Influence on Production Scheduling in Multi-element Mines","authors":"M. Jamshidi, M. Osanloo","doi":"10.5829/ije.2018.31.01a.23","DOIUrl":"https://doi.org/10.5829/ije.2018.31.01a.23","url":null,"abstract":"In multi-element deposits, different blocks are blended together to create a product with a predetermined quality. Generally, blending aims to obtain a special quality and quantity based on determining the processing plant or customer needs. However, blending causes different products based on the deposit properties. Thus, a block is blended with others to create one of many possible products. The present study aims to develop a mixed integer programming model for the production scheduling of iron ore mines. The model can consider different destinations for mine blocks. Each destination has its own specifications for the main element (Fe) and other existing elements such as sulfur and phosphorous. For this purpose, ten different scenarios were evaluated to investigate the effect of multiple products on production scheduling and Net Present Value (NPV) of the related project. Among the four selected scenarios, the mine was scheduled based on single product while multiple products were considered in scheduling in other scenarios. Based on the results, the maximum NPV in scenarios with multiple products is approximately 15% higher than that of the single product scenarios.","PeriodicalId":416886,"journal":{"name":"International journal of engineering. Transactions A: basics","volume":"59 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2017-11-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130533067","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: 2

Flow Over an Exponentially Stretching Porous Sheet with Cross-diffusion Effects and Convective Thermal Conditions 具有交叉扩散效应和对流热条件的指数拉伸多孔板上的流动

International journal of engineering. Transactions A: basics Pub Date : 2017-11-30 DOI: 10.5829/ije.2018.31.01a.17

D. Srinivasacharya, P. Jagadeeshwar

引用次数: 2

Application of the Hot Spotting Method for the Straightening of a Large Turbine Rotor 热点焊法在大型汽轮机转子矫直中的应用

International journal of engineering. Transactions A: basics Pub Date : 2017-11-30 DOI: 10.5829/ije.2018.31.01a.16

E. Poursaeidi, M. Yazdi

{"title":"Application of the Hot Spotting Method for the Straightening of a Large Turbine Rotor","authors":"E. Poursaeidi, M. Yazdi","doi":"10.5829/ije.2018.31.01a.16","DOIUrl":"https://doi.org/10.5829/ije.2018.31.01a.16","url":null,"abstract":"Different problems may cause distortion of the rotor, and hence vibration, which is the most severe damage of the turbine rotors. Different techniques have been developed for the straightening of bent rotors. The method for straightening can be selected according to initial information from preliminary inspections and tests such as nondestructive tests, chemical analysis, run out tests and also a knowledge of the shaft material. HIP turbine rotors operate in a specific temperature range. Among many problems that occur during the service life of rotor few important issues are temper embrittlement, creep, thermal fatigue, corrosion, and local distortions. According to test results, hot spot straightening method was studied. Experimental studies were carried out at 16 stages. The experimental results showed that selecting a large hot spot area will not lead to the required straightness, but by reducing the heating area, the heating time decreased, and the straightening process achieved a satisfactory amount of reverse deflection. Heating the overlapped areas produces undesirable effects, such as local residual stress and/or hardness and cracks; moreover, it is not effective in straightening. Use of the finite element method before practical hot spotting is recommended to achieve satisfactory results.","PeriodicalId":416886,"journal":{"name":"International journal of engineering. Transactions A: basics","volume":"152 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2017-11-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123825704","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: 3

Fracture Mechanism of CoCrMo Porous Nano-composite Prepared by Powder Metallurgy Route 粉末冶金法制备CoCrMo多孔纳米复合材料的断裂机理

International journal of engineering. Transactions A: basics Pub Date : 2017-11-30 DOI: 10.5829/ije.2018.31.01a.03

M. T. Dehaghani, M. Ahmadian

引用次数: 3