Student: Mohammad Safar
Committee: Dr. Heather Emady and Dr. Marylaura Lind Thomas
Abstract:
Heat transfer in rotary drums can be conducted through experiments or numerical simulations such as discrete element method and discrete ordinates method via heat transfer mechanisms; conduction, convection, and radiation. The review aims to investigate heat transfer mechanisms in various rotary drum designs based on literatures to fit further experiments and simulations conducted in the lab. Also, the effect of operating parameters such as rotational speed, filling degree, and temperature on heat transfer coefficients were studied and found in various literatures. In a literature review of horizontal rotary drum, the heat transfer rate was improved by increasing the number of small particles and decreasing the number of large particles. Rotational speed played a significant role in the heat transfer coefficient and enhanced heat conduction rate in an article about three-dimensional heat transfer rotary drums. In an indirectly heated rotary drum article, the heat transfer coefficient at 3 rpm was equal to 46.2 W/ (m2 K), and at 9 rpm the heat transfer coefficient was equal to 54.3 W/ (m2 K). While in a flighted rotary kiln, operating parameters not always had an obvious effect on the wall-to-solid heat transfer coefficient in the experimental and determination modeling article. Furthermore, radiative heat transfer significantly affected the heat transfer coefficient. In contrast, convective heat transfer had little to no impact on the heat transfer coefficient in a flighted rotary kiln’s heat transfer coefficient. Most studies agreed when the maximum operating temperature was lower than 500 oC, radiative heat transfer was usually negligible.
Zoom Room: https://asu.zoom.us/j/6325000722
Presentation Time: 12:00-1:00 PM (Arizona Time)
