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  1 - Numerical Study of the Flow Field and Heat Transfer of a Non-Newtonian Magnetic Nanofluid in A Vertical Channel Affected by A Magnetic Field
  amireh nourbakhsh amirreza sadeghi
  10.30486/admt.2022.1939334.1312
  The present paper examines thermal and hydrodynamic behavior of the incompressible laminar flow of a non-Newtonian magnetic nanofluid in a vertical rectangular channel numerically using two-phase mixture model, Carreau model, and finite volume method. The non-uniform tr أکثر

  The present paper examines thermal and hydrodynamic behavior of the incompressible laminar flow of a non-Newtonian magnetic nanofluid in a vertical rectangular channel numerically using two-phase mixture model, Carreau model, and finite volume method. The non-uniform transverse magnetic field is created by an electric current-carrying wire located along the channel. The Schiller-Naumann model is employed to calculate the slip velocity between the solid and liquid phases. The flow pattern and nanofluid temperature is assessed by changing effective parameters such as Reynolds number, the magnetic field strength, flow rate, mean axial temperature, and channel heat transfer. It is observed that the transverse secondary flow increases by increasing the magnetic strength due to Kelvin force. The hot fluid is transferred more from the sidewall to the center of the channel and the cold fluid moves from the center of the channel towards the wall, leading to an increase in heat transfer. Also, at low Reynolds numbers, more fluctuations occur in the velocity profile due to the dominance of Kelvin force over inertial force. تفاصيل المقالة
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  2 - Overview the Factors Affecting the Discharge of Contaminated Insulators and Intelligent Change Some of Them to Reduce the Discharge Intensity
  Yadullah Shafiei Faramarz Faghihi Amir Hossein Salemi Hossein Heydari
  10.30495/ijsee.2022.1966860.1226
  In this article, the most important factors affecting the discharge characteristics of high voltage insulators will be investigated. The type and severity of pollution, geographical and climatic conditions such as fog, rain, and wind, as well as the height above sea lev أکثر

  In this article, the most important factors affecting the discharge characteristics of high voltage insulators will be investigated. The type and severity of pollution, geographical and climatic conditions such as fog, rain, and wind, as well as the height above sea level, and finally the appearance and constituent materials of insulators will be studied as the main influencing factors in causing flashes on their surface. In addition to its severity, the type of pollution has a great effect on the electrical properties of insulators. This issue is discussed in the first section of the article for common types of pollution with different severities. Furthermore , a mixture of pollutants in the air is also examined, and the insulation waste is also shown in the case of design only based on sea salt, which is the worst type of pollution.In the next part, a review on the influence of climatic and geographical conditions has been performed, and in it, the effect of frost, wind, humidity and altitude on the start of electric discharge is discussed as the most important of them.And finally, the effect of appearance and its associated parameters as well as the constituent materials of insulators in pollution conditions are the last factors that will be considered. In addition, in this study, it has been shown how by intelligently changing these two factors, leakage current and discharge intensity can be reduced in contaminated insulators and their premature aging and failure can be delayed. تفاصيل المقالة