Mean residence time and mass fraction of tracer in a liquid-solid tapered inverse fluidized bed: numerical modelling with experimental validation

2021 ◽  
Author(s):  
H. Upender ◽  
K. Anand Kishore ◽  
Asif Afzal ◽  
Md. Tariqul Islam ◽  
Muhammad Ibrahim
Keyword(s):  
Numerical Modelling ◽  
Fluidized Bed ◽  
Residence Time ◽  
Mean Residence Time ◽  
Mass Fraction ◽  
Experimental Validation ◽  
Inverse Fluidized Bed

scholarly journals Measurement and characterization of biomass mean residence time in an air-blown bubbling fluidized bed gasification reactor

Fuel ◽  
2019 ◽  
Vol 253 ◽  
pp. 1414-1423 ◽  
Author(s):  
Cornelius E. Agu ◽  
Christoph Pfeifer ◽  
Marianne Eikeland ◽  
Lars-Andre Tokheim ◽  
Britt M.E. Moldestad
Keyword(s):  
Fluidized Bed ◽  
Residence Time ◽  
Mean Residence Time ◽  
Bubbling Fluidized Bed

Precipitation and filtration of zinc, magnesium, copper and aluminium hydroxides

1982 ◽  
Vol 47 (12) ◽  
pp. 3362-3370
Author(s):  
Otakar Söhnel ◽  
Eva Matějčková
Keyword(s):  
Residence Time ◽  
Mean Residence Time ◽  
Filtration Resistance ◽  
Filtration Pressure ◽  
Bed Porosity ◽  
The Mean ◽  
Filtration Properties

Filtration properties of batchwise precipitated suspensions of Zn(OH)2, Mg(OH)2 and Cu(OH)2 and continuously precipitated Al(OH)3 were studied. For batchwise precipitated suspensions was verified the theoretically predicted dependence of specific filtration resistance on initial supersaturation and for the continuously precipitated Al(OH)3 the relation between the specific filtration resistance and the mean residence time of suspension in the reactor. Dependences were also recorded between the bed porosity and concentration of precipitated solutions, specific filtration resistance and used filtration pressure and the effect of aging of the batchwise precipitated suspension of Mg(OH)2on its filtration properties. The used CST method for determination of filtration characteristics of Zn(OH)2 suspension was also studied.

Nitrogen use efficiency: does a trade-off exist between the N productivity and the mean residence time within species?

2008 ◽  
Vol 56 (3) ◽  
pp. 272 ◽  
Author(s):  
Zhi Y. Yuan ◽  
Han Y. H. Chen ◽  
Ling H. Li
Keyword(s):  
Residence Time ◽  
Nitrogen Use Efficiency ◽  
Mean Residence Time ◽  
Negative Relationship ◽  
Controlled Experiments ◽  
Nitrogen Use ◽  
Trade Off ◽  
N Supply ◽  
Use Efficiency ◽  
The Mean

Nitrogen use efficiency (NUE) can be divided into two components, i.e. N productivity (A) and the mean residence time (MRT). Controlled experiments indicate that there is not a trade-off between A and MRT within species, but this theory has not been well tested in field conditions. Here, we studied the A, MRT and NUE of Stipa krylovii Roshev. in a grassland over 4 years of N fertilisation experimentation. The three parameters (A, MRT and NUE) were significantly related to soil N supply and there was a negative relationship between A and MRT within this species (r = –0.775, P < 0.05), i.e. plants with higher A had lower MRT. Our results showed a trade-off between A and MRT within this Stipa species and this observed trade-off was attributed to different responses of A and MRT to soil fertility.

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