Journal of Mechanical Engineering and Vibration: 4 (3)

Open Access Article

1 - Simulation of using self-destruction for renewable bio-capsule carrying astronauts
kouros Nekoufar Hadi Seydgar Qadir Esmaili

Aerodynamic heating is one of the main problems in flying at high speed. At such a rate the surface temperature of the object will increase so that at this temperature the most metals melt or even evaporate. Specially, this problems occur in launch into space when retur More

Aerodynamic heating is one of the main problems in flying at high speed. At such a rate the surface temperature of the object will increase so that at this temperature the most metals melt or even evaporate. Specially, this problems occur in launch into space when return to the atmosphere is critical and thermal protection is targeted. These protectives which are mainly known as heat shields, protects projectile substrates that may be of manned, against extreme heatfluxes. Heat shields materials destroy by absorption thermal energy used in the evaporation process and endothermic reactions and protect its lower layers, hence study on the sacrificial material is important. Manuscript profile

Open Access Article

2 - Thermal and hydraulic analysis of a novel p double fluid parabolic through solar collector equipped with corrugated tube and insulator roof
mojtaba jamiati

The present study investigates a double-fluid volumetric based parabolic trough solar receiver. The control volume approach is used to solve the system of classical single phase governing equations by using the finite volume method. The standard k–ε turbul More

The present study investigates a double-fluid volumetric based parabolic trough solar receiver. The control volume approach is used to solve the system of classical single phase governing equations by using the finite volume method. The standard k–ε turbulence model with enhanced wall function is selected. According to obtained results, the value of efficiency of Conventional-Parabolic-Through-Solar-Collectors (CPTSCs) and Novel-Parabolic-Through-Solar-Collectors (NPTSCs) reduces by increasing of inlet temperature of base fluid and therefore, there is an optimum inlet temperature for all configurations and it is equal to 40°C. Manuscript profile

Open Access Article

3 - Numerical and Experimental Investigation on the Formability of Sheet Metal Coated by hot dip Galvanizing Using TPIF Method
Mojtaba Hasanlu

Since it is usually necessary to make molds, heavy presses, light presses and other forming equipment, in order to form crustal and sheet-shaped parts, in cases where rapid prototype production, low flow of production, flexibility Consider the production process in the More

Since it is usually necessary to make molds, heavy presses, light presses and other forming equipment, in order to form crustal and sheet-shaped parts, in cases where rapid prototype production, low flow of production, flexibility Consider the production process in the direction of changing the model or piece to be considered. For this reason, the process of developing sheet development (ISF) has been very much considered in recent decades. In this formulation, a simple straightforward tool with a sheet locked by a fixture is in contact with the point and the tool carries out a specific movement in the direction and direction predetermined by the numerical control machine (CNC) and The formation of gradual and deformed plastic deformation occurs on the sheet with low force in the area under the tool, and the formation of the resulting result is combined with the local deformation of the plastic. Manuscript profile

Open Access Article

4 - The effect of the thermal conductivity coefficients of building materials according to different sources on the thermal load and carbon dioxide emissions of the building
Syed Esmaeil Sadati Hadi Kargar Sharifabad Nader Rahbar Abdollah Khalesi Doost

Energy saving is one of the challenges of today. In recent years, growing concerns about the environmental impacts of energy consumption and global warming has doubled the importance of this issue. Meanwhile energy consumption in construction sector is so high that savi More

Energy saving is one of the challenges of today. In recent years, growing concerns about the environmental impacts of energy consumption and global warming has doubled the importance of this issue. Meanwhile energy consumption in construction sector is so high that saving even as little as possible in this section will have significant effect on efficiency rate of no renewable sources. Accurate measurement of thermal conductivity has an important role in determining the calculations of cooling and heating loads of buildings according to different climates. Considering multiple relevant parameters in energy consumption with no application of simulating tools cannot permit reasonable decisions on designing building parts. In this research, the annual energy consumption of an office building located in the climate of Yazd city has been simulated and compared by Design Builder. Manuscript profile

Open Access Article

5 - Strengthening of beam-column connection with FRP jacket and strips
Alireza Bitaraf Mina Ajorlou

Considering the changes in design codes, many structures built in recent decades do not meet the requirements of the new codes. Therefore, in order to maintain the performance of these structures, it is necessary to retrofitting them. FRP materials are one of the suitab More

Considering the changes in design codes, many structures built in recent decades do not meet the requirements of the new codes. Therefore, in order to maintain the performance of these structures, it is necessary to retrofitting them. FRP materials are one of the suitable materials for strengthening structures against vibration loads such as earthquakes. However, due to the high cost of FRP and the difficulty of execution in the strengthening of existing structures, it is very important to provide new efficient methods for the use of these materials. For this reason, in the present study, the use of FRP strips for stregthening of beam to column joints was investigated and its effect on joint behavior was studied. For this purpose, ten models were introduced, modeled and analyzed with ABAQUS software. The results showed that the use of horizontal and diagonal strips on the beams increased the joint strength up to 37%. The final displacement of the beam also increased up to 102%. The present study showed that the use of FRP stripes is an effective technique for improving RC joints Manuscript profile

Open Access Article

6 - Numerical Simulation of Pool Boiling Heat Transfer, Focusing On Surface Structural Characteristics In ANSYS Fluent: A review
Ermia Zargham Mohammad Hassan Nobakhti morteza khayat

Multiphase flows, such as pool boiling, are complex multi-physical -multi-scale problems that require a multitude of numerical techniques to solve different physics combined for a specific set of flow parameters and different regimes. For this reason, a well-established More

Multiphase flows, such as pool boiling, are complex multi-physical -multi-scale problems that require a multitude of numerical techniques to solve different physics combined for a specific set of flow parameters and different regimes. For this reason, a well-established numerical solution for well-validated predictive simulations has not yet been clearly defined. The main purpose of this study is to summarize the methods and basic principles of numerical simulation of pool boiling and explain all the steps of its implementation in ANSYS Fluent software in a clear and transparent manner. In this research, the details of numerical models and the results obtained for the nucleate boiling regime are presented to analyze the single bubble dynamics and calculate the critical heat flux. Heat flux is also included. The results of this study show that numerical simulations have a relatively good agreement with laboratory and experimental data. Manuscript profile

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