Measurements and analytical modeling of heat transfer in flowing granular media
An investigation was conducted of the heat-transfer characteristics of a variety of flowing-particulate solid media. Five different granular materials were studied in a vertical gravity-driven flow through an electrically heated circular stainless steel tube test section. From measurements of wall temperature distribution, particle bulk-inlet temperature, radial temperature distribution of the particle flow at the test section exit, and mass flow rate, determination of local and average heat-transfer coefficients along the test section were made. Comparison of the experimental results with predictions of various models appearing in the literature were made. A more physically realistic theoretical model was developed to improve the agreement between experimental results and analytical predictions. The packet theory of heat transfer of Mickley was modified by accounting for the presence of the wall in affecting the local voidage. A model of the heat-transfer processes within the media adjacent to the wall was developed that takes into account the variation of the thermophysical properties of the media in that region. A simple numerical solution to the resulting energy equation was obtained.
- Research Organization:
- Tennessee Univ., Knoxville (USA)
- OSTI ID:
- 7158985
- Resource Relation:
- Other Information: Thesis (Ph. D.)
- Country of Publication:
- United States
- Language:
- English
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