Department of Mechanical Engineering

University of Technology

Oral Defense - MS Degree Thesis

Titled” "Experimental and Numerical Study of Convection Heat Transfer Inside a Triangular Channel Filled with Porous Media at Constant Heat Flux Boundary Condition"

By:  Sabah Raad Mahdi Saleh

Members of the examining committee:

Chair:

Asst. Prof. Dr. Lama Fadel Ali

Members:

Asst. Prof. Dr. Qusai Jihad Abdel Ghafour

Dr. Yasmine Hamid Abdel Hussein

Supervision By:

Dr. Suhad Abdul Hamid Rashid

Mr. Sabah Raad Mahdi Saleh has been debated his thesis titled" A practical and numerical study of heat transfer by forced convection inside a triangular duct filled with porous material under a constant heat flux as a boundary condition". The main objectives of this study are to study the effect of the overall heat transfer coefficient when using glass balls with a diameter (5 mm and 12 mm) as a porous medium inside a triangular channel and that the porosity inside the channel was (0.468 and 0.616) respectively for the Reynolds number range from (3165 to 10915 at a constant heat flux and that the fluid used is air. Furthermore, to study the effect of changing the angle of rotation of the channel on the same axis (from zero to 30 degrees and 60 degrees).

The researcher concluded that the usage of glass balls as a porous medium boosts the overall heat transfer coefficient. Consequently, the overall heat transfer coefficient at the Reynolds number (10915) is around 90.2% for the balls at a diameter equal to 5 mm, and 88.1% for balls at a diameter of 12 mm when compared with the channel that is not filled with porous medium. Further, the effect of changing the channel rotation angle is very slight at the same Reynolds number.

The researcher recommended that the usage of glass balls as a porous medium works to enhance the performance of heat transfer via the triangular channel, that affects increasing the pressure difference on the two ends of the channel, as well as the increase in the coefficient of friction. Extra, the effectiveness coefficient of the entire system was at porosity (0.616) better than at porosity (0.468).

Best wishes to our student Mr. Sabah Raad Mahdi Saleh