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- 저자 : Jamal Ahmadi (검색결과 2 건)
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Modified Time-Dependent Model for Flexural Capacity Assessment of Corroded RC Elements
Behrouz Akbarian Reshvanlou,Kiarash Nasserasadi,Jamal Ahmadi 대한토목학회 2021 KSCE JOURNAL OF CIVIL ENGINEERING Vol.25 No.10
The corrosion of embedded steel bars in concrete is one of the severe deterioration processes that can escalate the risk and reduce the durability and lifetime of concrete structures. Based on the literature, simultaneous corrosion of longitudinal and transverse bar is considered to estimate section capacity. In this research, a flexible multi-stage approach is proposed to differentiate between corrosion levels on longitudinal and transverse reinforcement based on their corrosion initiating time. The result indicated that the multi-stage approach provides higher capacity and curvature for the sections. A significant reduction in reinforced concrete (RC) sections' ductility after corrosion of confining bars and before starting corrosion of longitudinal rebars was observed, which illustrates the importance of stirrups corrosion effects on the sections' ductility. In the higher values of corrosion intensity, confined concrete's ultimate strain tends to reach the unconfined state. Using the energy-based method of calculating ultimate concrete compressive strain instead of approximate methods, a higher value of curvature ductility of corroded RC cross-sections is obtained.
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Influence of gas exhaust geometry on flow pattern, performance, and erosion rate of a gas cyclone
Parvaz Farzad,Hosseini Seyyed Hossein,Bastan Ahmad Reza,Foroozesh Jamal,Babaoğlu Nihan Uygur,Elsayed Khairy,Ahmadi Goodarz 한국화학공학회 2023 Korean Journal of Chemical Engineering Vol.40 No.7
The effect of gas exhaust shape on the performance, flow pattern, and erosion rate of a gas cyclone was investigated using a numerical model. The results show that the shape of the gas exhaust affects the movement of the vortex core in the gas cyclone. With a change in the shape of the exhaust gas, the axial and tangential velocities changed in the cyclone. The highest turbulent kinetic energy in cyclones was found in the gas exhaust region. The results showed that the diamond gas exhaust exhibited the highest turbulent kinetic energy among the other shapes. In the cases of diamond and square gas exhausts, the size of the Rankine vortex was decreased, leading to a reduction in the centrifugal force of the gas flow and, thereby, cyclone separation efficiency. The lowest erosion rate and highest separation efficiency were found for the cyclone with a circular gas exhaust.
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