Principal Statistical Relations of Mass Transfer in Critical Flow

2010 ◽  
pp. 93-105
Author(s):  
Eugene Barsky
Keyword(s):  
Mass Transfer ◽  
Critical Flow

Odour, covering and ventilation

2009 ◽  
Vol 59 (7) ◽  
pp. 1377-1384 ◽  
Author(s):  
D. Sivil ◽  
J. A. Hobson
Keyword(s):  
Mass Transfer ◽  
Emission Rate ◽  
Extraction Rate ◽  
Critical Flow ◽  
Residence Times ◽  
Minimum Rate ◽  
Maximum Value ◽  
Odour Concentration ◽  
Rate Of Extraction ◽  
Concentration Limits

A technique is described based on the decay in concentration of added SF6 to measure L0, the rate of leakage from an enclosure with no extraction of air. It is believed this measurement is much more precise than measurements of E0, the minimum rate of extraction which just prevents leakage. Three out of four enclosures studied had L0 values equating to residence times of air that were well under one hour. Relationships were developed between extraction rate and concentration and emission rate for enclosed odour sources based on mass transfer from water to air. These could be used to assess the benefits of minimising extraction rates while remaining within concentration limits set on the grounds of corrosion or toxicity. From these relationships a critical flow can be identified, termed Q50, at which both the emission rate and concentration of a particular species are at 50% of their maximum value. In any particular system, Q50 for one species, such as H2S, will in general not be the same as for another species, nor for odour concentration. As a consequence the benefit of reducing extraction rates based on H2S may not appear as good as it would based on an assessment of odour concentration. A second consequence is that as the rate of air extraction is varied, the ratio between two species or between H2S and odour concentration, is likely to vary.

scholarly journals Identification of areas of emergence of critical flow regimes of nonlinear viscous liquids in a tubular reactor

2019 ◽  
Vol 124 ◽  
pp. 05046
Author(s):  
S.A. Livshits ◽  
N.A. Yudina ◽  
T.U. Dunaeva ◽  
E.K. Nikolaeva ◽  
S.R. Enikeeva
Keyword(s):  
Mathematical Model ◽  
Mass Transfer ◽  
Continuous Production ◽  
Tubular Reactor ◽  
Flow Regimes ◽  
Critical Flow ◽  
Control Parameters ◽  
Viscous Liquids ◽  
Production Scheme ◽  
The Mathematical Model

The mathematical model describing heat-mass transfer in rheologically complex media in a tubular reactor is developed in the article. Using the example of the continuous production scheme for grade B2 polymethacrylate, solutions of the characteristic equations confirming the possibility of emergence the critical flow regimes for certain sets of control parameters were obtained.

Comparator method for critical flow nozzles calibration

2019 ◽  
pp. 44-47
Author(s):  
A. V. Mingaleev ◽  
◽  
A. I. Gorchev ◽  
A. B. Yakovlev ◽  
◽  
...  
Keyword(s):  
Critical Flow ◽  
Comparator Method
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