Within the scientific activities of the Department of Chemical Engineering, a doctoral thesis for the student Omar Sabah Mahdi entitled (Experimental and Computational Investigation of Hydrodynamics and Heat Transfer for Particles mixture in Three-Phase Fluidized Bed) was discussed on Sunday 26/6/2022. The discussion committee consisted of Prof. Dr. Raheeq Ismail Ibrahim, chairman, Prof. Dr. Asawer Abdel Rasoul Kouiri, member, Prof. Dr. Malik Mustafa Mohamed, member, Asst. Prof. Dr. Zainab Yousif Shanine, member, Asst. Prof. Dr. Amer Hamid Majeed, member, and under the supervision of both Prof. Dr. Jamal Manee Ali Al-Rubaye and Asst. Prof. Dr. Amer Aziz Abdul Rahman. As well as the scientific evaluation of the thesis by Prof. Dr. Venus Majid Hamid from Al-Nahrain University and Prof. Dr. Muhammad Nassif Abbas from Al Mustansiriya University, and linguistically by Asst. Prof. Dr. Samir Ali Amin from the University of Technology.