کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
237468 | 465708 | 2011 | 7 صفحه PDF | دانلود رایگان |
Hydrodynamic characterization of fluidized beds is vital to many industrial processes, including the production of biofuels, pharmaceuticals, and numerous petroleum products. Local time-average phase fractions can be quantified in these multiphase three-dimensional systems using X-ray computed tomography (CT). This paper describes repeatability and uniformity measurements in a 3D 15.2 cm diameter cold flow fluidized bed using CT imaging to quantify gas holdup. Two different bed materials and a range of superficial gas velocities are investigated. Five tests over different days are completed to show repeatability for each test condition. Highly repeatable local time-average gas holdup is recorded at various locations within the bed for each material over all flow conditions. Uniformity is determined by analyzing the local time-average gas holdup at 12 azimuthal locations for both materials and various flow conditions. Uniform axi-symmetric fluidization is observed for each material and Ug when the bed height is greater than h = 0.25D, where the effects of individual aeration holes dissipate.
This paper describes the calculation repeatability and uniformity of gas holdup in a 3D cold flow fluidized bed using CT imaging. Varying bed materials and flow conditions are investigated. Gas holdup calculations were found to be highly repeatable and uniform axi-symmetric fluidization is observed for each material and flow condition when the bed height is greater than h = 0.25D.Figure optionsDownload as PowerPoint slideHighlights
► Gas holdup repeatability validation in fluidized beds using 3D X-ray CT.
► Repeatability shown across various flow rates and bed materials.
► Axi-symmetric flow is observed far from the aeration region.
► Results are significant for CFD modelers simulating 3D experimental data.
Journal: Powder Technology - Volume 213, Issues 1–3, 10 November 2011, Pages 148–154