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Full-Text Articles in Physics

Characterizing Acoustic Fluidized Bed Hydrodynamics Using X-Ray Computed Tomography, David R. Escudero, Theodore J. Heindel Jul 2013

Characterizing Acoustic Fluidized Bed Hydrodynamics Using X-Ray Computed Tomography, David R. Escudero, Theodore J. Heindel

Mechanical Engineering Conference Presentations, Papers, and Proceedings

Fluidized bed reactors are important assets of many industrial applications because they provide uniform temperature distributions, low pressure drops, and high heat/mass rates. Characterizing the hydrodynamics of a fluidized bed is important to better understand the behavior of these multiphase flow systems. The hydrodynamic behavior in a cold flow 3D fluidized bed, with and without acoustic intervention, using X-ray computed tomography is investigated in this study. Experiments are carried out in a 10.2 cm ID fluidized bed filled with glass beads, with material density of 2600 kg/m3 and particle size ranges between 212–600 μm. In ...


A High-Speed X-Ray Detector System For Noninvasive Fluid Flow Measurements, Timothy B. Morgan, Benjamin R. Halls, Terrence R. Meyer, Theodore J. Heindel Jul 2013

A High-Speed X-Ray Detector System For Noninvasive Fluid Flow Measurements, Timothy B. Morgan, Benjamin R. Halls, Terrence R. Meyer, Theodore J. Heindel

Mechanical Engineering Conference Presentations, Papers, and Proceedings

The opaque nature of many multiphase flows has long posed a significant challenge to the visualization and measurement of desired characteristics. To overcome this difficulty, X-ray imaging, both in the form of radiography and computed tomography, has been used successfully to quantify various multiphase flow phenomena. However, the relatively low temporal resolution of typical X-ray systems limit their use to moderately slow flows and time-average values. This paper discusses the development of an X-ray detection system capable of high-speed radiographic imaging that can be used to visualize multiphase flows. Details of the hardware will be given and then applied to ...


Chip Segmentation In Machining: A Study Of Deformation Localization Characteristics In Ti6al4v, Abhijit Chandra, Pavan Karra, Adam Bragg, Jie Wang, Gap-Yong Kim Jun 2013

Chip Segmentation In Machining: A Study Of Deformation Localization Characteristics In Ti6al4v, Abhijit Chandra, Pavan Karra, Adam Bragg, Jie Wang, Gap-Yong Kim

Mechanical Engineering Conference Presentations, Papers, and Proceedings

Chip segmentation by deformation localization is an important process in a certain range of velocities and might be desirable in reducing cutting forces and by improving chips’ evacuation, whereas few studies of practical criteria to calculate shear band spacing are available in literature. This paper extends nonlinear dynamics model for chip segmentation by allowing time varying orientation of the shear plane that are pronounced in strain hardening materials. The model extends the non-linear dynamics approach with additional state variables to the Burns and Davies approach. The model is simulated numerically to predict the shear bands of the chip. The numerical ...