Document Type
Thesis
Date of Award
5-31-1984
Degree Name
Master of Science in Mechanical Engineering - (M.S.)
Department
Mechanical Engineering
First Advisor
P. Hrycak
Second Advisor
P. Hrycak
Third Advisor
John Vincent Droughton
Abstract
A model of heat transfer by conduction and radiation in fluidized beds operating in the bubbling regime is proposed. The analysis of the combined conduction and radiation is one dimensional and is based on the emulsion packet model. The problem is formulated in terms of a non-linear partial differential equation which is transformed into an ordinary differential equation by using the similarity transformation. The packet emulsion phase is assumed to be a semi-infinite medium which absorbs, emits and scatters thermal radiation. Moreover, the packet emulsion phase is considered to be under optically thick condition. Radiative transfer during bubble contact is added as a time - weighted contribution.
Using experimental data from packed bed experiments and experi-mental data on packet residence times, the conductive and radiative heat transfer were calculated at different fluidizing velocities and wall temperatures. The analytical results indicate that radiative contribution is affected by particle size, average packet residence time, and the conduction-radiation parameter. The model estimates a 14 to 50 percent contribution by radiation to the total heat transfer. Comparison to very limited experimental data from the literature shows a fairly reasonable agreement.
Recommended Citation
Kouame, Kouadio, "A model of heat transfer by conduction and radiation in fluidized bed" (1984). Theses. 3626.
https://digitalcommons.njit.edu/theses/3626
