Role of coherent structures on reynolds stresses in a 2‐D bubble column

Mudde, Robert F.; Lee, D. J.; Reese, J.; Fan, Lijie

doi:10.1002/aic.690430407

Cited by 109 publications

(104 citation statements)

References 17 publications

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“…The particle granular temperature is similar to that of time series analysis for turbulence in a gas-liquid bubble column (Mudde et al, 1997), where the measured velocity of tracer particle showed a high frequency oscillation in a very small time. The normal stresses were a flat, like the granular temperatures.…”

Section: Particlesupporting

confidence: 50%

“…The particle granular temperature by the second method is similar to that of time series analysis for turbulence in a gas-liquid bubble column (Mudde et al, 1997). It shows a high frequency oscillation in a very small time.…”

Section: Bubble Criterionmentioning

confidence: 61%

“…It is similar to that for the particle granular temperature, but the mean particle velocity, instead v(r,t), is the average 4.17 value of all frames (c 0 (r)). A similar analysis was performed by Mudde et al (1997) for obtaining stress in a gas-liquid bubble column. 4.10) where, n is the number of the streak line over all frames.…”

Section: Particlementioning

confidence: 99%

“…This is an error primarily due to insufficient frames in the velocity space. As pointed out by Mudde et al (1997) in PIV method for a gas-liquid flow, the method for total granular temperature may be attributed to the equal weight of the streak lines in all frames. The clusters of the small streak lines in a particular frame have a large influence on the average over all frames.…”

Section: Particlementioning

confidence: 99%

“…L. S Fan group (Mudde et al, 1997) showed that the difference between the variances by the first and third methods is small in PIV method for a gas-liquid bubble column. The variances were calculated according to the first method with the stress equation given in table 1.…”

Section: Bubble Criterionmentioning

confidence: 99%

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2 methane on the coal surfaces that may otherwise stay adsorbed in the coal matrix by decreasing the partial pressure of methane in the gas mixture. In addition, experimental work conducted on enhanced coalbed methane recovery by CO 2 injection [Reznik et al, 1984] shows that CO 2 is more adsorbing on coal than methane thereby giving it the potential to efficiently displace CBM and remain sequestered in the coal-seam. Thus coal-seams are considered to offer a very attractive option for CO 2 sequestration.In this work, focus is on the final part of the sequestration process -storage. The effects of various coal properties as well as operational scenarios on the injection and storage of CO 2 into a given coal-seam are analyzed. The analyses are based on results obtained from PSU-COALCOMP, a compositional coalbed methane numerical reservoir simulator capable of modeling the primary and enhanced recovery of coalbed methane.The operational design parameters considered in this study include the type, length and orientation of the injectors/producers while the coal-seam properties studied include coal porosity, coal permeability, cleat spacing, sorption capacity, and the initial conditions of the coal-seam -the reservoir pressure, adsorbed gas composition, amount of CO 2 initially adsorbed, water saturation and free-gas composition.Based on the data, results and analyses obtained, a CO 2 sequestration performance predictor tool is developed using artificial neural network (ANN) technology. The developed network will be able to predict the values of the performance indicators of the CO 2 sequestration process for a wide range of coal-seams and various production schemes. The developed ANN would also enhance our understanding of CO 2 sequestration process. 3 CHAPTER 2 LITERATURE REVIEW Carbon Dioxide SequestrationThe amount of carbon dioxide (CO 2 ) in the atmosphere has risen from preindustrial levels and most of this increase has been in recent years as shown in the data presented graphically in Figure 2-1. The corresponding increase in temperature as CO 2 levels increase raises environmental concerns such as global warming and its effects.This increase in CO 2 levels is attributed widely to the burning of fossil fuels, and if current trends in resource utilization continue, anthropogenic CO 2 emissions will increase rapidly during the 21 st century. Figure 2-2 shows the sharp increase in global CO 2 emissions over the last 100 years.The term "CO 2 sequestration" refers to the removal of CO 2 from either manmade emissions or the atmosphere and the safe, essentially permanent storage of this CO 2 .There are two main types of sequestration: direct sequestration, where CO 2 is removed from energy systems, and indirect sequestration, where CO 2 is removed from the ambient atmosphe re by enhanced natural processes. Sequestration is one of the three options for stabilizing CO 2 concentrations in the atmosphere and until the late 1990's, was not yet in the scientific lexicon. It is less familiar to the public at large than...

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Section: Particlesupporting

confidence: 50%

Section: Bubble Criterionmentioning

confidence: 61%

Section: Particlementioning

confidence: 99%

Section: Particlementioning

confidence: 99%

Section: Bubble Criterionmentioning

confidence: 99%

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