Velocity fluctuation interpretation in the near wall region of a dense riser

Journal Article · Fri Feb 22 04:00:00 EST 2008 · Powder Technology

DOI:https://doi.org/10.1016/j.powtec.2007.08.018· OSTI ID:925549

Breault, R W; Guenther, C P; Shadle, L J

Tests were conducted in a cold flow circulating fluidized bed to gather computational fluid dynamics (CFD) model validation data. Particle velocity measurements were obtained with an LDV system under various operating conditions at locations near the wall to provide data in terms of a time series of particle velocity values. Time scale criteria were developed to characterize the variance of the velocity fluctuations from LDV measurements as either granular temperature or granular turbulent kinetic energy. By applying these criteria to categorize the variations in the velocities for adjacent particles passing the sample volume, the resulting granular temperatures were found to be much smaller than the granular (particle) turbulent kinetic energy. Average values for the granular temperature in this system ranged between 0.02 to 0.1 m2/s2, while the particle turbulent kinetic energy ranged from 0.6 to 0.9 m2/s2. Both were dependent upon solids fraction; decreasing with increasing solids fraction. The velocity fluctuation data was also analyzed using the autocorrelation technique providing axial solids dispersion coefficients. These values range from 0.005 to 0.8 m2/s and were found to be a function of both the gas velocity and solids fraction. A method was developed to estimate the local solids fraction with the LDV data.

• Research Organization: National Energy Technology Laboratory (NETL), Pittsburgh, PA, Morgantown, WV, and Albany, OR (United States)
• Sponsoring Organization: USDOE - Office of Fossil Energy (FE)
• OSTI ID: 925549
• Report Number(s): DOE/NETL-IR-2008-102
• Journal Information: Powder Technology, Journal Name: Powder Technology Journal Issue: 2 Vol. 182; ISSN 0032-5910
• Publisher: Elsevier B.V.
• Country of Publication: United States
• Language: English

Related Subjects

42 ENGINEERING
CIRCULATING SYSTEMS
COMPUTERIZED SIMULATION
Circulating fluidized bed
FLOW MODELS
FLUCTUATIONS
FLUID MECHANICS
FLUIDIZED BEDS
GRANULAR MATERIALS
Granular temperature
KINETIC ENERGY
Particle turbulent kinetic energy
Solids dispersion
TWO-PHASE FLOW