Wisam Muhi Mohammed Al-Agele - Mechanical Engineering Department, University of Urmia, Urmia, Iran
Seyed Mehdi Pesteei - Mechanical Engineering Department, University of Urmia, Urmia, Iran

In the study, a channel of special geometry with a depth of ۳۰ cm was used at an entry angle of ۲۰, ۳۰,۴۰, and ۵۰ degrees. Gambit software has been used to create geometry, grids, and boundary conditions, and Fluent software has been used to analyze numerical results. The number of grids used while maintaining the independence of the results was about ۱۲۰ thousand rectangular cube grids that were used in a structuredmanner. In this study, the laminar flow regime in the range of Reynolds numbers between ۶۳۰ and ۱۹۰۰ has been subjected to numerical analysis. Due to its high thermal conductivity, aluminum oxide has been used in ۱ , ۲ , and ۳ by volume mixed with water fluid. According to the results, the use of special geometry increased the average Nusselt number and the average heat transfer coefficient. Furthermore, an increase in the Reynolds number for laminar flow causes an increase in the local and average Nusselt number. The use of high-volume percentages of aluminum oxide nanoparticles mixed with water fluid causes an increase in the average Nusselt number so that the highest average Nusselt number obtained in the entire analysis of the present study is related to the Reynolds number of ۱۹۰۰ with the presence of ۳ ofnanoparticles. Also, it is found that in the Reynolds number range of ۲۰۰ to ۱۵۰۰, the use or non-use of nanoparticles up to two percent by volume does not cause a significant change in the pressure drop of the duct. According to the productivity index, the case with alfa ۳۰o and ۳ nanoparticles has better results.

Convective, Pressure Drop, Laminar flow, Numerical Study