Study of multiphase flow useful to understanding scaleup of coal-liquefaction reactors. Technical progress report, December 1, 1982-February 28, 1983

Technical Report · Tue Mar 01 04:00:00 EST 1983

OSTI ID:6227191

Knickle, H N

Gas holdup measurements for air and aqueous carboxy methyl cellulose solutions have been performed using the 13 inch acrylic column. Preliminary results were reported last month for air and water. A 1/4 inch thick porous plate with 70 micrometer pores made of polyethylene and an acrylic sieve plate with 1/8 inch diameter holes were used as gas distributors. Holdup was measured at different axial positions and compared to total holdup measurements by summing. The gas velocity range extended over the bubble and bubble-slug patterns. Gas holdup measurements in the six inch column have been measured for air-water mixtures using 17 different gas distributions. The results have been analyzed for the effect of the distributor on holdup in a bubble column. The variables included thickness, material, hydrophobic versus hydrophylic, and porosity. The major difference in gas holdup measurements occurred when comparing sieve plates and porous plates. Specific differences were found when comparing the porous plates at the transition between bubble and bubble-slug flow patterns. The gas holdup at the transition varied between 0.21 and 0.34. The holdup in the transition range also varied. Gas velocity at the transition ranged between 0.055 to 0.085 m/s for different porous distributions.

• Research Organization: Rhode Island Univ., Kingston (USA). Dept. of Chemical Engineering
• DOE Contract Number: FG22-81PC40797
• OSTI ID: 6227191
• Report Number(s): DOE/PC/40797-6; ON: DE83010165
• Country of Publication: United States
• Language: English

Related Subjects

01 COAL, LIGNITE, AND PEAT
010405* -- Coal
Lignite
& Peat-- Hydrogenation & Liquefaction
AIR
AQUEOUS SOLUTIONS
BUBBLES
CHEMICAL REACTORS
COAL LIQUEFACTION
DATA
DISPERSIONS
EXPERIMENTAL DATA
FLUID FLOW
FLUIDS
GASES
INFORMATION
LIQUEFACTION
MIXTURES
MULTIPHASE FLOW
NUMERICAL DATA
SIZE
SOLUTIONS
THERMOCHEMICAL PROCESSES