Static liquid holdup in packed beds of spherical particles

AIChE Journal ◽  
1991 ◽  
Vol 37 (11) ◽  
pp. 1733-1736 ◽  
Author(s):  
A. E. Sáez ◽  
M. M. Yépez ◽  
C. Cabrera ◽  
E. M. Soria
Keyword(s):  
Spherical Particles ◽  
Packed Beds ◽  
Liquid Holdup

Nature of Residual Liquid Holdup in Packed Beds of Spherical Particles

2004 ◽  
Vol 43 (26) ◽  
pp. 8363-8368 ◽  
Author(s):  
Werner van der Merwe ◽  
Chandra Maree ◽  
Willie Nicol
Keyword(s):  
Spherical Particles ◽  
Packed Beds ◽  
Residual Liquid ◽  
Liquid Holdup

A Modification on Ergun's Correlation for Use in Cylindrical Packed Beds With Non-spherical Particles

2008 ◽  
Vol 19 (4) ◽  
pp. 369-381 ◽  
Author(s):  
Emrah Ozahi ◽  
Mehmet Yasar Gundogdu ◽  
Melda Ö. Carpinlioglu
Keyword(s):  
Spherical Particles ◽  
Packed Beds

scholarly journals Enhancing the Thermal Performance of Slender Packed Beds through Internal Heat Fins

Processes ◽  
2020 ◽  
Vol 8 (12) ◽  
pp. 1528
Author(s):  
Nico Jurtz ◽  
Steffen Flaischlen ◽  
Sören C. Scherf ◽  
Matthias Kraume ◽  
Gregor D. Wehinger
Keyword(s):  
Heat Transfer ◽  
Heat Transport ◽  
Thermal Performance ◽  
Internal Heat ◽  
Spherical Particles ◽  
Reactor Wall ◽  
Packed Beds ◽  
Radial Heat ◽  
Simulation Results ◽  
The Impact

Slender packed beds are widely used in the chemical and process industry for heterogeneous catalytic reactions in tube-bundle reactors. Under safety and reaction engineering aspects, good radial heat transfer is of outstanding importance. However, because of local wall effects, the radial heat transport in the vicinity of the reactor wall is hindered. Particle-resolved computational fluid dynamics (CFD) is used to investigate the impact of internal heat fins on the near wall radial heat transport in slender packed beds filled with spherical particles. The simulation results are validated against experimental measurements in terms of particle count and pressure drop. The simulation results show that internal heat fins increase the conductive portion of the radial heat transport close to the reactor wall, leading to an overall increased thermal performance of the system. In a wide flow range (100<Rep<1000), an increase of up to 35% in wall heat transfer coefficient and almost 90% in effective radial thermal conductivity is observed, respectively.

Thermal Contact Conductance of Packed Beds in Contact With a Flat Surface

1988 ◽  
Vol 110 (1) ◽  
pp. 38-41 ◽  
Author(s):  
G. P. Peterson ◽  
L. S. Fletcher
Keyword(s):  
Experimental Investigation ◽  
Stainless Steel ◽  
Thermal Contact ◽  
Spherical Particles ◽  
Thermal Contact Conductance ◽  
Packed Beds ◽  
Contact Conductance ◽  
Analytical Expression ◽  
Flat Surfaces ◽  
Stainless Steel 304

An experimental investigation was conducted to determine the thermal contact conductance of packed beds of spherical particles in contact with flat surfaces. Beds comprised of four materials, Aluminum 2017-T4, Yellow Brass, Stainless Steel 304, and Chromium Alloy AISI 52100, all in contact with flat Stainless Steel 304, surfaces were evaluated in a vacuum environment, at a mean interface temperature of 66°C. In addition to the experimental program, an analytical expression was developed by combining previous work performed by other investigators. The results of the experimental investigation are compared with the analytical expression and indicate that an accurate method of predicting the thermal contact conductance at the interface between beds of spherical particles and nominally flat surfaces has been identified.

Evaluation of Structural Properties of Cylindrical Packed Beds Using Numerical Simulations and Tomographic Experiments

2009 ◽  
Vol 7 (1) ◽  
Author(s):  
Nestor J Mariani ◽  
Wilson I Salvat ◽  
Agustina Campesi ◽  
Guillermo F Barreto ◽  
Osvaldo M Martínez
Keyword(s):  
Fixed Bed ◽  
Diameter Ratio ◽  
The Other ◽  
Spherical Particles ◽  
Packed Beds ◽  
Particle Center ◽  
Aspect Ratios ◽  
Fixed Bed Reactors ◽  
Local Properties ◽  
Ct Data

This contribution is focused on the analysis of the structure of packed beds of spherical particles at relatively low aspect ratios (i.e., particle to tube diameter ratio) as those arising in multitubular fixed bed reactors. On one hand, the computed tomography (CT) technique is employed to evaluate the position of each particle in the packing and from this information local properties such as particle center distribution and radial porosity profile were obtained. On the other hand, results from a previously developed algorithm to simulate packings were compared with those from our CT data and from literature sources. The agreement was very satisfactory.

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