Residence time distribution in an internal loop airlift reactor: CFD simulation versus digital image processing measurement

2018 ◽  
Vol 167 ◽  
pp. 221-228 ◽  
Author(s):  
Negin Farhadian ◽  
Jamshid Behin ◽  
Arsalan Parvareh
Keyword(s):  
Image Processing ◽  
Digital Image Processing ◽  
Residence Time ◽  
Digital Image ◽  
Time Distribution ◽  
Residence Time Distribution ◽  
Cfd Simulation ◽  
Airlift Reactor ◽  
Internal Loop ◽  
Processing Measurement

A method for measuring the residence time distribution of particles in a fluidized bed based on digital image analysis

2021 ◽  
Vol 0 (0) ◽  
Author(s):  
Jiamin Li ◽  
Xiaoping Chen ◽  
Jiliang Ma ◽  
Cai Liang
Keyword(s):  
Image Analysis ◽  
Fluidized Bed ◽  
Residence Time ◽  
Digital Image ◽  
Time Distribution ◽  
Residence Time Distribution ◽  
Digital Image Analysis ◽  
Color Space ◽  
The Difference ◽  
Accuracy And Repeatability

AbstractTraditional methods for measuring the residence time distribution (RTD) of particles in a fluidized bed are complex and time-consuming. To this regard, the present work proposes a new measurement method with remarkable efficiency based on digital image analysis. The dyed tracers are recognized in the images of the samples due to the difference of colors from bed materials. The HSV and the well-known RGB color space were employed to distinguish the tracers. By enhancing the Saturation and the Value in HSV and adjusting the gray range of images, the recognition error is effectively reduced. Then the pixels representing the tracers are distinguished, based on which the concentration of the tracers and RTD are measured. The efficiency, accuracy and repeatability of the method were validated by RTD measurements experiments. The method is also fit for distinguishing the target particles from multi-component systems consisting of particles of different colors.

Digital image processing measurement of the upper eyelid contour in graves disease and congenital blepharoptosis

Ophthalmology ◽  
1998 ◽  
Vol 105 (5) ◽  
pp. 913-918 ◽  
Author(s):  
Antonio A.V Cruz ◽  
Roberto P Coelho ◽  
Adriano Baccega ◽  
Maria C Lucchezi ◽  
André D.A Souza ◽  
...  
Keyword(s):  
Image Processing ◽  
Digital Image Processing ◽  
Digital Image ◽  
Graves Disease ◽  
Upper Eyelid ◽  
Processing Measurement

CFD Simulation of Gas Residence Time Distribution in Agitated Tank

2013 ◽  
Vol 732-733 ◽  
pp. 467-471
Author(s):  
Liang Chao Li
Keyword(s):  
Residence Time ◽  
Software Package ◽  
Time Distribution ◽  
Residence Time Distribution ◽  
Cfd Simulation ◽  
Stirred Tank ◽  
Tracer Method ◽  
Inlet Flow Rate ◽  
Simulation Results ◽  
Small Bubbles

Gas residence time is an important parameter for gas-liquid agitated tank. Two approaches, i.e., Euler-Tracer method and CFD-DPM method are proposed for predicting gas residence time distribution (RTD) in an aerated agitated tank by using a Fluent 6.2 software package. The simulation results show that the characteristic of the gas-RTD is a curve with single peak and long tailing. Bubble size, stirring speed and gas inlet flow rate have great effect on gas-RTD in the stirred tank. Small bubbles have wider residence time distribution and stay in the vessel longer than the large bubbles and tend to complete mixing. With increasing of impeller speed or decreasing of gas inlet rate, gas-RTD become wider and have longer average gas residence time, which is in favor of gas effectively utilization.

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