Scientia Iranica最新文献_第2页

Hydro-thermal phenomena of oil-multi-walled carbon nanotubes nano-fluid flow through a rectangular channel: impact of obstacles 油-多壁碳纳米管纳米流体流经矩形通道的水热现象：障碍物的影响

IF 1.4 4区工程技术

Scientia Iranica Pub Date : 2024-01-10 DOI: 10.24200/sci.2024.61739.7465

Shahul Hameed, Sandip Saha

{"title":"Hydro-thermal phenomena of oil-multi-walled carbon nanotubes nano-fluid flow through a rectangular channel: impact of obstacles","authors":"Shahul Hameed, Sandip Saha","doi":"10.24200/sci.2024.61739.7465","DOIUrl":"https://doi.org/10.24200/sci.2024.61739.7465","url":null,"abstract":"Thermo-hydraulic analysis of nano-fluid flow phenomena through rectangular channels has currently created much interest among researchers, and is being used in a variety of engineering applications (including glass blowing, and continuous metal casting, especially in a variety of manufacturing processes like transpiration cooling, and laser pulse heating). The hydrothermal properties of nano-fluid flow in a rectangular channel embedded with obstacles under uniform heat flux have been studied numerically with the variations of the values of Reynolds numbers ( 𝑅𝑒 ) and different forms of obstacle. The governing equations have been solved using the finite volume approach, and fluent software has been used to visualize the simulation results. The impact of various forms of obstacle (plane, trapezoidal, elliptical, and triangular), the volume fraction of nano-particle (D%), and 𝑅𝑒 on the different thermo-hydraulic fluid flow phenomena have been investigated numerically. At 𝑅𝑒 = 1, 60, 120 , and 𝐷% ∈ [0 − 4], the distributions of flow velocity, absolute pressure drop ( ∆𝑝 ) , temperature profile, average friction factor ( 𝑓 ) , local Nusselt number ( 𝑁𝑢 ( 𝑥 )) , and average Nusselt number ( 𝑁𝑢 𝑎𝑣𝑔 ) have been demonstrated for all the forms of obstacle. It has been discovered that, in terms of the various characteristics of hydrothermal flow phenomena, plane obstacles are more pronounced, whereas elliptical obstacles are less pronounced.","PeriodicalId":21605,"journal":{"name":"Scientia Iranica","volume":null,"pages":null},"PeriodicalIF":1.4,"publicationDate":"2024-01-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139534728","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Analysis of a transformer designed for wireless power transmission system for different distance and alignment conditions and optimization with a developed algorithm 分析为无线输电系统设计的变压器在不同距离和排列条件下的情况，并利用开发的算法进行优化

IF 1.4 4区工程技术

Scientia Iranica Pub Date : 2024-01-10 DOI: 10.24200/sci.2024.63188.8268

Y. Ozupak, M. Cinar

引用次数: 0

Hydrodesulfurization of Gas Condensate containing Di-Sulfide Oil: Catalyst synthesis and evaluation 含二硫油的凝析气加氢脱硫：催化剂合成与评估

IF 1.4 4区工程技术

Scientia Iranica Pub Date : 2024-01-09 DOI: 10.24200/sci.2024.60760.6975

Mozhgan Rostami, Reza Davarnejad, Seyed Javid Royaee, Reza Seif Mohaddecy

引用次数: 0

Application of a novel quadratic polynomial discrete grey model to forecast energy consumption of China 一种新的二次多项式离散灰色模型在中国能源消费预测中的应用

4区工程技术

Scientia Iranica Pub Date : 2023-10-17 DOI: 10.24200/sci.2023.53774.3405

Xin Ma, Wenqing Wu, Yuanyuan Zhang

引用次数: 0

Temperature dependent heat generation and variable viscosity features for viscoelastic fluid with homogeneous and heterogeneous (HH) chemical reactions 具有均相和非均相(HH)化学反应的粘弹性流体的温度依赖性热生成和可变粘度特征

4区工程技术

Scientia Iranica Pub Date : 2023-10-17 DOI: 10.24200/sci.2023.61173.7179

Munazza Saeed, Bilal Ahmad, Chemseddine Maatki, Tasawar Abbas, Bilel Hadrich, Sami Ullah Khan, Karim Kriaa, Qazi Mehmood Ul-Hassan, Lioua Kolsi

引用次数: 0

Modeling of Jet Electrochemical Machining Using Numerical and Design of Experiments Methods 射流电化学加工的数值模拟与实验设计方法

4区工程技术

Scientia Iranica Pub Date : 2023-10-17 DOI: 10.24200/sci.2023.60185.6650

Ali Mehrvar, Mohsen Motamedi, Abouzar Jamalpour

{"title":"Modeling of Jet Electrochemical Machining Using Numerical and Design of Experiments Methods","authors":"Ali Mehrvar, Mohsen Motamedi, Abouzar Jamalpour","doi":"10.24200/sci.2023.60185.6650","DOIUrl":"https://doi.org/10.24200/sci.2023.60185.6650","url":null,"abstract":"Modeling and determining the optimal conditions for the jet electrochemical machining (Jet-ECM) process is critical. In this study, a hybrid approach combining numerical and design of experiments (DOE) methods have been applied to model and determine the optimal conditions for Jet-ECM. The voltage (V), inner tool diameter (I), initial machining gap (G), and electrolyte conductivity (C) are considered input variables. Additionally, dimensional accuracy (E) and machining depth (D) are response variables. Twenty-seven numerical simulations have been performed using the Box–Behnken design to implement the response surface methodology (RSM). Consequently, two mathematical models have been obtained for these response variables. The effects of the input variables on the response variables are investigated using statistical techniques such as variance analysis. Furthermore, the desirability function approach has been applied to determine the optimal conditions for dimensional accuracy and depth of machining. The results show that the optimal values for achieving maximum depth of machining while maintaining a dimensional accuracy of 0.05 mm are as follows: electrolyte conductivity of 8 S/m, voltage of 36.9 V, initial machining gap of 200 μm, and inner tool diameter of 0.4 mm.","PeriodicalId":21605,"journal":{"name":"Scientia Iranica","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2023-10-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"136078460","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Improving the Performance of Variable Reluctance Resolver Against Short Circuit Using Physical Parameters 利用物理参数提高变磁阻变压器抗短路性能

4区工程技术

Scientia Iranica Pub Date : 2023-10-17 DOI: 10.24200/sci.2023.62539.7901

Hamed Lasjerdi, Zahra Nasiri-Gheidari

引用次数: 0

Fabrication of a Cost-effective Piezoresistive Pressure Sensor Based on PVC/Reduced Graphene Oxide (rGO) Composite 基于PVC/还原氧化石墨烯(rGO)复合材料的高性价比压阻压力传感器的制备

4区工程技术

Scientia Iranica Pub Date : 2023-10-17 DOI: 10.24200/sci.2023.62495.7870

Iraj Ahadzadeh, Samira Dabbagh

{"title":"Fabrication of a Cost-effective Piezoresistive Pressure Sensor Based on PVC/Reduced Graphene Oxide (rGO) Composite","authors":"Iraj Ahadzadeh, Samira Dabbagh","doi":"10.24200/sci.2023.62495.7870","DOIUrl":"https://doi.org/10.24200/sci.2023.62495.7870","url":null,"abstract":"A cost-effective piezoresistive sensor based on PVC/Reduced graphene oxide (rGO) was fabricated and its performance was investigated. The weight percent range from 0.1 to 30% of rGO in PVC matrix was studied. Composite parts were prepared by using the solution casting method from tetrahydrofurane (THF) solvent followed by solvent evaporation. The plot of electrical conduction versus rGO percentage was constructed to obtain the percolation threshold concentration. It was found that the percolation threshold of rGO leading to a continuous stable electrical conductivity in PVC matrix is about 25% beyond which electrical resistance was reduced from about 800 GΩ to lower than 100 KΩ range. The relative changes in electrical resistance of prepared polymer parts as a result of impact (stress), stretch and bending deformation were studied. The results showed that the fabricated composite can be used for sensing and/or monitoring and measurement of any mechanical displacement with high sensitivity, promising reproducibility and satisfactory durability. It must be mentioned that, during impact tests of polymer composites, a small piezoelectric effect was also observed for which further complimentary studies are being planned to be performed in near future in order to better understand this effect and its underlining molecular basis.","PeriodicalId":21605,"journal":{"name":"Scientia Iranica","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2023-10-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"136078478","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Simultaneous energy hub operation and construction for investigating quantitative flexibility considering uncertain supply and demand side resources 考虑不确定供需侧资源的能源枢纽同步运行与建设定量灵活性研究

4区工程技术

Scientia Iranica Pub Date : 2023-10-17 DOI: 10.24200/sci.2023.61477.7330

Basir Rashedi, Amir Abdollahi, Masoud Rashidinejad

{"title":"Simultaneous energy hub operation and construction for investigating quantitative flexibility considering uncertain supply and demand side resources","authors":"Basir Rashedi, Amir Abdollahi, Masoud Rashidinejad","doi":"10.24200/sci.2023.61477.7330","DOIUrl":"https://doi.org/10.24200/sci.2023.61477.7330","url":null,"abstract":"In this paper, the quantitative flexibility of EH is evaluated considering a flexibility index which is based upon available maximum capacity as well as the response time of generating units. Here, the impact of simultaneous EH operation and construction are investigated on quantitative flexibility considering both uncertain supply and demand side resources. Hence, a new structure so-called multi-objective simultaneous operation/construction optimization of multi-carrier EH is presented which consists of a decrease in operation and construction costs as well increase in power system flexibility. The demand side uncertainties, including thermal/electrical demand, are implemented by the Gaussian distribution function, and uncertainty on the supply side, including gas pressure uncertainty (GPU), is modeled by the probabilistic–possibilistic Z-number method. Also, in multifarious cases, the performance of the proposed index is evaluated. It is shown how flexible resources like electrical storage systems (ESS), thermal storage systems (TSS), electrical demand response programs (EDRP), and thermal demand response programs (TDRP) can increase the flexibility of the EH. It is also conducted that how the flexibility enhancement can increase construction costs.","PeriodicalId":21605,"journal":{"name":"Scientia Iranica","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2023-10-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"136039754","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

An economic order quantity model for two deteriorating items with mutually complementary price and time dependent demand 价格互补且需求随时间变化的两种变质物品的经济订货量模型

4区工程技术

Scientia Iranica Pub Date : 2023-10-17 DOI: 10.24200/sci.2023.59611.6337

David Mahlangu, Olufemi Adetunji, Makoena Sebatjane

引用次数: 0