Reza Roshan

Reza Roshan
Persian Gulf University | PGU · Department of Business Administration

About

14
Publications
4,855
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193
Citations
Citations since 2017
0 Research Items
139 Citations
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2017201820192020202120222023010203040
2017201820192020202120222023010203040
2017201820192020202120222023010203040
Introduction
Skills and Expertise

Publications

Publications (14)
Article
Full-text available
Studies of last two decades refer to limits on the classical models of asset pricing such capital asset pricing model (CAPM) and consumption-based CAPM (CCAPM). In this article we make adjustments in CCAPM model and have been estimated modified models for the economy of Iran from 1988 to 2011. These models are housing CCAPM (HCCAPM) and SCCAPM that...
Article
Full-text available
The present study focuses on the effect of vortex formation on plane velocities in a reservoir. Velocity measurements are performed in the hydraulic model of Karun III dam and hydropower plant. Different vortices were produced at the horizontal intake by changing the submerged depth. Tangential velocities were measured on a rectangular mesh in the...
Article
Full-text available
Bottom outlet tunnels are among the most important structures of dam design processes and operation which are encountered with many dangerous problems. This study investigating the flow aeration between emergency and service gates along the bottom tunnel using a large enough physical model of Karun IV Dam bottom outlet. To do so, performance of 12...
Conference Paper
Full-text available
Aerators are constructed in high speed flows to prevent cavitation attack. Although horseshoe or circular tunnel sections can be converted to rectangular shape to use aerators similar to chute spillways, such a solution needs expensive subsequent concrete operation. Alternatively, annular aerators could be constructed which fit well with the tunnel...
Conference Paper
Full-text available
In order to support the future economic developments in the world, one of the most important objectives is the reduction of energy losses. Apart from this objective, hydropower dams which are considered a renewable energy source encounter this problem. Karun III Dam and Hydropower Plant is constructed on the Karun River in the province of Khuzestan...
Article
The efficiency of horizontal perforated and solid plates, installed on top of an intake for prevention of surface vortex formation, was experimentally investigated. The experiments were conducted on a horizontal intake of a reservoir. By changing the angle of the approach flow, submergence of the intake and the discharge, 36 air-core surface vortic...
Article
We performed an extensive physical experiment to analyze the factors which affect the development of rooster tail in bottom outlets. This study suggests that several variables affect the development of rooster tail in the bottom outlets including the upstream control section, and the slope of the tunnel walls (i.e. sudden expansion vs. gradual expa...
Article
Full-text available
This paper describes the study of two physical models that were built to investigate the energy dissipation and flow regimes for different discharges over stepped spillways with different numbers of steps. These physical models had a general slope of 19?2% and had 12 and 23 steps respectively. Experiments were carried out for a wide range of discha...
Article
The effect of the intake head wall slope and the installation of a trash rack on the type and strength of vortices are studied experimentally. The strength within each vortex was determined by measuring its tangential velocity utilizing an Acoustic Doppler Velocimeter (ADV). Experiments were carried out with a projected intake and an intake with va...
Conference Paper
Full-text available
In hydropower plants the kinetic energy of falling water is captured to generate electricity. In this process, the formation of vortices with an air core at the power intake entrances is expected at lower reservoir levels. The entrainment of air and swirl into the power tunnels leads to a reduction of power generation and vibration and damage to th...
Article
Studies on a large bottom outlet were conducted in Water Research Institute, Tehran. Objectives of these studies were to measure the rating curve of the tunnel gate, flow air demand and to study the flow condition upstream and downstream of the gate. It was decided to conduct these studies both physically and numerically. For this purpose a 1:17 sc...
Article
Full-text available
Vortex formation due to power generation at hydropower dams could cause serious problems, and eliminating or reduction in its strength is one of the dam designer and manager duties. Therefore, the design and use of anti-vortex structures is usual. Design of an anti-vortex structure for each project is unique and it is therefore necessary to have kn...

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