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Title: Particle pressures in fluidized beds. Final report

Abstract

This project studies the particle pressure, which may be thought of as the force exerted by the particulate phase of a multiphase mixture, independently of that exerted by other phases. The project is divided into two parts, one concerning gas and the other liquid fluidized beds. Previous work on gas fluidized beds had suggested that the particle pressures are generated by bubbling action. Thus, for these gas fluidized bed studies, the particle pressure is measured around single bubbles generated in 2-D fluidized beds, using special probes developed especially for this purpose. Liquid beds are immune from bubbling and the particle pressures proved too small to measure directly. However, the major interest in particle pressures in liquid beds lies in their stabilizing effect that arises from the effective elasticity (the derivative of the particle pressure with respect to the void fraction), they impart to the bed. So rather than directly measure the particle pressure, the authors inferred the values of the elasticity from measurements of instability growth in liquid beds; the inference was made by first developing a generic stability model (one with all the normally modeled coefficients left undetermined) and then working backwards to determine the unknown coefficients, including themore » elasticity.« less

Authors:
; ;
Publication Date:
Research Org.:
Univ. of Southern California, Dept. of Mechanical Engineering, Los Angeles, CA (United States)
Sponsoring Org.:
USDOE Office of Energy Research, Washington, DC (United States)
OSTI Identifier:
656579
Report Number(s):
DOE/ER/14223-T2
ON: DE98007339; TRN: AHC29817%%135
DOE Contract Number:  
FG03-91ER14223
Resource Type:
Technical Report
Resource Relation:
Other Information: PBD: Sep 1996
Country of Publication:
United States
Language:
English
Subject:
42 ENGINEERING NOT INCLUDED IN OTHER CATEGORIES; PROGRESS REPORT; FLUIDIZED BEDS; TWO-PHASE FLOW; PARTICULATES; PRESSURE MEASUREMENT; FLOW MODELS; TWO-DIMENSIONAL CALCULATIONS; ELASTICITY; VISCOSITY; EXPERIMENTAL DATA

Citation Formats

Campbell, C S, Rahman, K, and Jin, C. Particle pressures in fluidized beds. Final report. United States: N. p., 1996. Web. doi:10.2172/656579.
Campbell, C S, Rahman, K, & Jin, C. Particle pressures in fluidized beds. Final report. United States. https://doi.org/10.2172/656579
Campbell, C S, Rahman, K, and Jin, C. 1996. "Particle pressures in fluidized beds. Final report". United States. https://doi.org/10.2172/656579. https://www.osti.gov/servlets/purl/656579.
@article{osti_656579,
title = {Particle pressures in fluidized beds. Final report},
author = {Campbell, C S and Rahman, K and Jin, C},
abstractNote = {This project studies the particle pressure, which may be thought of as the force exerted by the particulate phase of a multiphase mixture, independently of that exerted by other phases. The project is divided into two parts, one concerning gas and the other liquid fluidized beds. Previous work on gas fluidized beds had suggested that the particle pressures are generated by bubbling action. Thus, for these gas fluidized bed studies, the particle pressure is measured around single bubbles generated in 2-D fluidized beds, using special probes developed especially for this purpose. Liquid beds are immune from bubbling and the particle pressures proved too small to measure directly. However, the major interest in particle pressures in liquid beds lies in their stabilizing effect that arises from the effective elasticity (the derivative of the particle pressure with respect to the void fraction), they impart to the bed. So rather than directly measure the particle pressure, the authors inferred the values of the elasticity from measurements of instability growth in liquid beds; the inference was made by first developing a generic stability model (one with all the normally modeled coefficients left undetermined) and then working backwards to determine the unknown coefficients, including the elasticity.},
doi = {10.2172/656579},
url = {https://www.osti.gov/biblio/656579}, journal = {},
number = ,
volume = ,
place = {United States},
year = {Sun Sep 01 00:00:00 EDT 1996},
month = {Sun Sep 01 00:00:00 EDT 1996}
}