scholarly journals Exploring the Relationships between Gas Dispersion Parameters and Differential Pressure Fluctuations in a Column Flotation

ACS Omega ◽  
2021 ◽  
Author(s):  
Xiangning Bu ◽  
Shaoqi Zhou ◽  
Meng Sun ◽  
Muidh Alheshibri ◽  
Md. Shakhaoath Khan ◽  
...  
Keyword(s):  
Pressure Fluctuations ◽  
Differential Pressure ◽  
Column Flotation ◽  
Dispersion Parameters ◽  
Gas Dispersion

scholarly journals Mining Process and Product Information From Pressure Fluctuations Within a Fuel Particle Coater

2009 ◽  
Vol 132 (1) ◽  
Author(s):  
Douglas W. Marshall ◽  
Charles M. Barnes
Keyword(s):  
Nuclear Power ◽  
Product Information ◽  
Pressure Fluctuations ◽  
Scale Up ◽  
Differential Pressure ◽  
Fuel Particle ◽  
Triso Fuel ◽  
Product And Process ◽  
Operation Pressure ◽  
Particle Bed

The next generation nuclear power/advanced gas reactor (NGNP/AGR) fuel development and qualification program included the design, installation, and testing of a 6-in. diameter nuclear fuel particle coater to demonstrate quality tri-structural isotropic (TRISO) fuel production on a small industrial scale. Scale-up from the laboratory-scale coater faced challenges associated with an increase in the kernel charge mass, kernel diameter, and a redesign of the gas distributor to achieve adequate fluidization throughout the deposition of the four TRISO coating layers. TRISO coatings are applied at very high temperatures in atmospheres of dense particulate clouds, corrosive gases, and hydrogen concentrations over 45% by volume. The severe environment, stringent product and process requirements, and the fragility of partially-formed coatings limit the insertion of probes or instruments into the coater vessel during operation. Pressure instrumentation were installed on the gas inlet line and exhaust line of the 6-in. coater to monitor the bed differential pressure and internal pressure fluctuations emanating from the fuel bed as a result of bed and gas “bubble” movements. These instruments are external to the particle bed and provide a glimpse into the dynamics of fuel particle bed during the coating process and data that could be used to help ascertain the adequacy of fluidization and, potentially, the dominant fluidization regimes. Pressure fluctuation and differential pressure data are not presently useful as process control instruments, but data suggest a link between the pressure signal structure and some measurable product attributes that could be exploited to get an early estimate of the attribute values.

Estimation of diameter and surface area flux of bubbles based on operational gas dispersion parameters by using regression and ANFIS

2013 ◽  
Vol 23 (3) ◽  
pp. 343-348 ◽  
Author(s):  
B. Shahbazi ◽  
B. Rezai ◽  
S. Chehreh Chelgani ◽  
S. M. Javad Koleini ◽  
M. Noaparast
Keyword(s):  
Surface Area ◽  
Dispersion Parameters ◽  
Gas Dispersion

Direct resolution of differential pressure fluctuations to characterize multi-scale dynamics in a gas fluidized bed

2016 ◽  
Vol 85 ◽  
pp. 380-394 ◽  
Author(s):  
Yumin Chen ◽  
Wei Chen ◽  
John R. Grace ◽  
Yongchun Zhao ◽  
Junying Zhang ◽  
...  
Keyword(s):  
Fluidized Bed ◽  
Pressure Fluctuations ◽  
Differential Pressure ◽  
Multi Scale

Measuring gas dispersion parameters: Selection of sampling points

2014 ◽  
Vol 65 ◽  
pp. 172-177
Author(s):  
R. Araya ◽  
M. Maldonado ◽  
C.O. Gomez ◽  
J.A. Finch
Keyword(s):  
Dispersion Parameters ◽  
Gas Dispersion ◽  
Parameters Selection ◽  
Sampling Points ◽  
Selection Of

Practical Upscaling Process for Enhanced Water Alternating Gas : A Numerical Investigation

2021 ◽  
Author(s):  
Saeed Majidaie ◽  
Luky Hendraningrat ◽  
M Azri Bin Hanifah
Keyword(s):  
Numerical Investigation ◽  
Scale Up ◽  
Gas Injection ◽  
Differential Pressure ◽  
Laboratory Analysis ◽  
Mobility Control ◽  
Base Case ◽  
Gas Dispersion ◽  
Water Alternating Gas ◽  
Mobility Reduction

Abstract Water alternating gas (WAG) is a well-known strategy to improve the mobility issues during gas injection. However, WAG was identified still having some challenges during implementation at oilfield with high reservoir heterogeneity and high permeable zones in the reservoir and will cause unfavorable mobility ratio. Enproperties of the selected core samplehancement of WAG (EWAG) using foam and surfactant has been research to solve its issue and has success stories. This paper will describe the work process of EWAG to be Pilot at Malaysian oilfield, focusing on numerical investigation during upscaling process. Foam treatment has role for gas mobility control, delaying gas breakthrough and diverting gas to unswept zones. Meanwhile, the surfactant was utilized to reduce the IFT between gas and liquid to enable gas dispersion into liquid phase. An in-house foaming surfactant has been developed and used for coreflooding experiment at harsh environment. It was used to generate stable foam in contact with gas and it caused a mobility reduction which was suitable for mobilizing trapped oil and hence improving oil recovery. Coreflood experiment was performed on native core and all experimental results were consolidated and checked for the quality prior model calibration in the reservoir simulator. Once coreflood model was constructed, base case was run using default foam parameters. It aimed initially to test whether the model run smoothly and to observe the matching quality using the default values. Once satisfactory matchings were achieved, the process continued with foam parameters upscaling. During scale-up process the velocity of the fluids and pressure drop were conserved as laboratory data. The important scale-up parameters and the corresponding scale-up ratio were investigated. Mobility Reduction Factor (MRF) was calculated by dividing average DP for each foam cycle with base differential pressure (DP) in the prior gas injection. MRF values for both lower and higher rate show increasing MRF values. Regardless, these values are lower in lower flowrates sequences compared to ones for higher flowrates. This corresponds to MRF values calculated in the laboratory analysis. Therefore, stronger and more stabilized foam were generated using higher injection rates. Lower and higher flowrates had distinctive set of foam parameters. The acceptable matches for differential pressure, oil, water, and gas were achieved. for lower flowrate. Based on this study, model was able to capture production trends depicted in the laboratory analysis. The foam parameter set from higher flowrates have more potential for further upscaling and modeling in full-field scale.

scholarly journals Experimental Investigation of Cavitation Signatures in an Automotive Torque Converter Using a Microwave Telemetry Technique

2003 ◽  
Vol 9 (6) ◽  
pp. 403-410 ◽  
Author(s):  
C. L. Anderson ◽  
L. Zeng ◽  
P. O. Sweger ◽  
A. Narain ◽  
J. R. Blough
Keyword(s):  
Experimental Investigation ◽  
Automatic Transmission ◽  
Pressure Fluctuations ◽  
Torque Converter ◽  
Differential Pressure ◽  
Operating Conditions ◽  
Pump Speed ◽  
Pressure Transducers ◽  
Charge Pressure ◽  
Transmission Fluid

A unique experimental investigation of cavitation signatures in an automotive torque converter under stall conditions is reported. A quantitative criterion is proposed for predicting early and advanced cavitation in terms of suitable nondimensional pump speeds. The dimensionless pump speed that marks early cavitation is obtained by relating this parameter to the appearance of charge-pressure–dependent pressure fluctuations in the differential pressure transducer readings. The differential pressure transducers were mounted at well-defined locations in the pump passage of a torque converter. The data were transmitted by a wireless telemetry system mounted on the pump housing. Data were received and processed by a ground-based data acquisition system. Automatic transmission fluid exhibited cavitation for charge pressures of 70–130 psi and pump speeds of 1000– 2250 rpm. Advanced cavitation was marked by operating conditions that exhibited a 2% or more torque degradation from the converter's noncavitating performance.For a given family of torque-converter designs and a given transmission fluid, the proposed nondimensional pumpspeed criteria are capable of marking early and advanced stages of cavitation for a range of torque-converter sizes and a range of charge pressures in the torque converter.

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