مطالعه تئوري و تجربي انتقال حرارت جت هاي برخوردي در فرآيندهاي جداسازي

Experimental and Theoretical Study of Impinging jet heat transfer in separation processes

In this research, heat transfer of impinging jets in separation processes was studied theoretically and experimentally. The experimental set up was similar to that applied in industry. The system consisted of a cylindrical furnace equipped with an electrical coil which was cooled with six circular coils each connected to eight 3 mm diameter nozzles with a 2.5 cm interval from the wall. The experiments were carried out in two different Reynolds numbers 13500 and 27000 using 7.5 to 14 kW power. The geometry of the system and experimental design was similar to a multiple impinging jets on a curved surface. The studies showed that due to the distances between jets, nozzle to furnace diameter ratio, and distance of the jet from the wall to furnace diameter ratio, the direct effects of jets on each other and curvature of the impact surface on heat transfer could be neglected and the system could be assumed as a set of single set on a flat plate. The results also showed considerable effects of the outlet flow location on the temperature distribution. Another important parameter which was defined for the first time in this work was the dimensionless length from the impact zone which has considerable effect on the temperature profile.