Lagrangian Velocity Measurements in a Pore-Scale of a Randomly Packed Bed Using Matching-Refractive-Index and Time-Resolved PTV Techniques

2019 ◽  
Author(s):  
Y. Hassan ◽  
S. King ◽  
T. Nguyen
Keyword(s):  
Refractive Index ◽  
Packed Bed ◽  
Pore Scale ◽  
Velocity Measurements ◽  
Time Resolved ◽  
Lagrangian Velocity

Experimental and Pore-scale Analysis of Flow and Thermal Fields in a Packed Bed Channel

2021 ◽  
pp. 1-18
Author(s):  
Mansoureh Khaljani ◽  
Meysam Nazari ◽  
Mahdi Azarpeyvand ◽  
Yasser Mahmoudi
Keyword(s):  
Packed Bed ◽  
Scale Analysis ◽  
Pore Scale ◽  
Thermal Fields

Two-color time-resolved Z-scan to study the thermal changes of the refractive index in liquids

1995 ◽  
Author(s):  
Valery P. Kozich ◽  
Jimmy A. Castillo ◽  
Florencio E. Hernandez ◽  
A. Olaizola
Keyword(s):  
Refractive Index ◽  
Time Resolved ◽  
Thermal Changes

Time-Resolved Velocity Measurements in a Matched Refractive Index Facility of Randomly Packed Spheres

2018 ◽  
Author(s):  
Ethan Kappes ◽  
Mateusz Marciniak ◽  
Andrew Mills ◽  
Robert Muyshondt ◽  
Stephen King ◽  
...  
Keyword(s):  
Root Mean Square ◽  
Experimental Studies ◽  
Reynolds Numbers ◽  
Index Of Refraction ◽  
Mean Square ◽  
Reynolds Stresses ◽  
Velocity Measurements ◽  
Mean Velocity ◽  
Time Resolved ◽  
Wall Boundary

Complex geometries and randomly connected void spaces within packed beds have hindered efforts to characterize the underlying transport phenomena occurring within. In this communication, we present our experimental studies on a facility of randomly packed spheres that can be a representative of sections within a reactor core in a nuclear power plant. The results of high-fidelity velocity measurements can be seen using Time-Resolved Particle Image Velocimetry (TR-PIV) at the pore scales and near the wall boundary in the Matched Index of Refraction (MIR) facility. The MIR approach allows for a non-invasive analysis of the flow within packed spheres at the microscopic scales with high temporal and spatial resolution. Flow characteristics obtained from the TR-PIV measurements at various Reynolds numbers are presented. The results include the first- and second-order flow statistics, such as mean velocity, root-mean-square fluctuating velocity and Reynolds stresses. Effects of the wall boundary and Reynolds numbers on flow patterns are currently being investigated. Comparisons of the mean velocities, root-mean-square fluctuating velocities, and Reynolds stress components show the increase of flow mixing and turbulent intensities within the gaps between spheres in the packed bed. Sizes of recirculation regions, however, seem to be independent of the increase of Reynolds numbers.

Bubble mechanisms and characteristics at pore scale in a packed-bed reactor

2009 ◽  
Vol 64 (13) ◽  
pp. 3179-3187 ◽  
Author(s):  
Daeseong Jo ◽  
Shripad T. Revankar
Keyword(s):  
Packed Bed ◽  
Packed Bed Reactor ◽  
Pore Scale

Femtosecond Desorption Dynamics Probed by Time-Resolved Velocity Measurements

1995 ◽  
Vol 75 (4) ◽  
pp. 673-676 ◽  
Author(s):  
D. G. Busch ◽  
Shiwu Gao ◽  
R. A. Pelak ◽  
M. F. Booth ◽  
W. Ho
Keyword(s):  
Velocity Measurements ◽  
Time Resolved

scholarly journals Numerical study of fluid flow at pore scale in packed bed of spheres and grains to obtain the REV

2020 ◽  
Vol 348 (8-9) ◽  
pp. 769-779
Author(s):  
Luis Carlos Martínez-Mendoza ◽  
Florencio Sánchez-Silva ◽  
Erik Fernando Martínez-Mendoza ◽  
Juan Antonio Cruz-Maya
Keyword(s):  
Fluid Flow ◽  
Numerical Study ◽  
Packed Bed ◽  
Pore Scale
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