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Open Access Article
1 - Tangential Displacement and Shear Stress Distribution in Non-Uniform Rotating Disk under Angular Acceleration by Semi-Exact Methods
S Jafari -
Open Access Article
2 - A Static Flexure of Thick Isotropic Plates Using Trigonometric Shear Deformation Theory
Y.M Ghugal A.S Sayyad -
Open Access Article
3 - Experimental Study of Interfacial Friction Factor and Shear Stress in Counter-current Two-phase Flow in a Vertical Pipe
Arash Ghafouri Ashkan Ghafouri Abbas kosarineia Alireza Daneh-DezfuliIn the experimental study, the formation of the annular flow pattern in a vertical pipe with the counter-current two-phase flow has been investigated with the help of image recording and processing techniques. After separating the created two-phase flow regime, the rang MoreIn the experimental study, the formation of the annular flow pattern in a vertical pipe with the counter-current two-phase flow has been investigated with the help of image recording and processing techniques. After separating the created two-phase flow regime, the range of superficial velocity of air (upward) and water (downward) is 3.66-20.94 m/s and 0.06-0.31m/s for annular flow, respectively. The interfacial friction factor (liquid and gas phase) has been evaluated according to the hydrodynamic parameters of the flow. Comparing the average deviation of the results obtained from the current research with the previous research shows that the results are in good agreement. Also, the interfacial shear stress has been calculated and evaluated for two test pipes in the center-current two-phase flow pattern in the annular flow regime. In this research, the interfacial friction factor (liquid and gas phase) is also presented as a new correlation depending on the Reynolds number of the gas flow and the Reynolds number of the liquid flow with a coefficient of determination of R2=0.98. Manuscript profile -
Open Access Article
4 - Effect of the Cylindrical Reinforcing Element’s Filling Materials on the Soil’s Resistance
Seyed Vahid Mojtahed Sistania Soheil Ghareh Mehdi Siavoshnia -
Open Access Article
5 - Channel bed unsteady analysis using critical shear stress and critical unit discharge (Case Study: Rivers Galali, Kurdistan)
میلاد رستمی Mohammad Mehdi HosainzadeOne of the key issues of erosion and stability of the river is the beginning the movement of sediment particles. Flow that will start moving particle, called the critical flow. The initial move threshold sediment particles has been investigated in several different meth MoreOne of the key issues of erosion and stability of the river is the beginning the movement of sediment particles. Flow that will start moving particle, called the critical flow. The initial move threshold sediment particles has been investigated in several different methods, most important of which are the average critical velocity, critical shear stress and critical unit discharge. To investigate the stability of the Galali river bed sediments in the according to river conditions used the critical shear stress and critical unit discharge methods. To determine initial move threshold sediment particles in the bed of the river were two cross-section of the river, two cross-section conditions were assessed. After that, the critical shear stress and critical unit discharge for four particle size D16, D50, D84 and D95 in each cross-section was calculated, and showed that in cross-section (1,2) in the bankfull discharge conditions all particles with sizes D16, D50, D84 and D95 begin to moving, and so in the bankfull discharge, sediment conditions will generally change. In cross-section (3) particles with a diameter D95 and the more it will be remain stable in the river bed, and other smaller particles of this size are starting to move. Due to further slope of the bed and width less active channel in the cross-section (1,2) has caused that all particles are unstable. Finally, the results from both methods were highly concordant, and this confirms that the use of these methods for stabilizes studies and sediment yield of river are appropriate. Manuscript profile -
Open Access Article
6 - River floor instability analysis using critical shear stress and discharge critical unit (Galali river case study, Qorve, Kurdistan)
Mohammad Mehdi Hoseinzadeh Milad RostamiOne of the key issues of erosion and stability of the river is the beginning the movement of sediment particles. River sediment yield caused water turbidity, nutrients and pollution problems of water, buried in the water diversion facilities as well as filling the water MoreOne of the key issues of erosion and stability of the river is the beginning the movement of sediment particles. River sediment yield caused water turbidity, nutrients and pollution problems of water, buried in the water diversion facilities as well as filling the water storage lakes. Flow that will start moving particle, called the critical flow. The initial move threshold sediment particles has been investigated in several different methods, most important of which are the average critical velocity, critical shear stress and critical unit discharge. To investigate the stability of the Galali river bed sediments in the city of Qorveh, according to river conditions used the critical shear stress and critical unit discharge methods. To determine initial move threshold sediment particles in the bed of the river were two cross-section of the river, two cross-section conditions were assessed. After that, the critical shear stress and critical unit discharge for four particle size D16, D50, D84 and D95 in each cross-section was calculated, and showed that in cross-section (1,2) in the bankfull discharge conditions all particles with sizes D16, D50, D84 and D95 begin to moving, and so in the bankfull discharge, sediment conditions will generally change. In cross-section (3) particles with a diameter D95 and the more it will be remain stable in the river bed, and other smaller particles of this size are starting to move. Due to further slope of the bed and width less active channel in the cross-section (1,2) has caused that all particles are unstable. Finally, the results from both methods were highly concordant, and this confirms that the use of these methods for stabilizes studies and sediment yield of river are appropriate. Manuscript profile -
Open Access Article
7 - Advanced Factors Affecting Microalgae Large-Scale Cultivation and Their Effects on Productivity Improvement
Sasan Ghobadian Neda SoltaniPerhaps talking about the use of microalgae species in various fields, global approaches to increase the productivity and شchieving economic superiority alongside لreat environmental benefits وis superfluous.Some of these factors such as illumination conditions, tempera MorePerhaps talking about the use of microalgae species in various fields, global approaches to increase the productivity and شchieving economic superiority alongside لreat environmental benefits وis superfluous.Some of these factors such as illumination conditions, temperature, nutrient concentration, CO2 content and the like have been researched befor. Therefore, in this article, simply review researches that focuses on some less tested factors but with significant effects on increasing culture productivity, especially on a large scale.Therefore, at first, different cultivation environments including fresh water, sea water and sewage for use in mass cultivation are described and compared and the superior species of each environment are introduced. Then different culture methods including photototrophic, heterotrophic, mixotrophic and photothetrophic were compare. Reuse of recycled water for microalgae cultivation process to reduce treatment and pumping costs and related challenges is considered. Finally, the effect of shear stresses (coused by equipments and is a major concern in large-scale cultivation) on cultivation productivity and ways to reduce these effects is considered. Manuscript profile -
Open Access Article
8 - Mathematical Modeling of Flow in a Granular Permeable Bed Channel
Hamid Reza Sheibani -
Open Access Article
9 - Modeling the Time-Dependent Rheological Properties of Pistachio Butter
Seyed M. A. Razavi Masoud Taghizadeh A Shaker Ardekani -
Open Access Article
10 - Effect of wind speed on the drag force and wall shear stress of domes in historical mosques of Iran: a case study
Iman Pishkar Mehdi Jahangiri Rouhollah Yadollahi Farsani Ayoub Khosravi Farsani -
Open Access Article
11 - Check Tic-coated Tungsten Carbide Tool Wear in Machining Steel
M. Karimian , E. Mir Mohammad Sadeghi M. Mokhles Pour Esfahani M. badakhshian