Similarity problems of the theory of unsteady concentration boundary layer

1983 ◽  
Vol 48 (10) ◽  
pp. 2751-2766
Author(s):  
Ondřej Wein ◽  
N. D. Kovalevskaya
Keyword(s):  
Boundary Layer ◽  
Approximate Method ◽  
Steady Flow ◽  
Broad Class ◽  
Concentration Boundary Layer ◽  
Concentration Change ◽  
Concentration Boundary ◽  
Flow Problems

Using a new approximate method, transient course of the local and mean diffusion fluxes following a step concentration change on the wall has been obtained for a broad class of steady flow problems.

Drag Reduction of Flat Plates with Slot Ejection of Polymer Solution

1970 ◽  
Vol 14 (02) ◽  
pp. 79-83
Author(s):  
Paul S. Granville
Keyword(s):  
Boundary Layer ◽  
Drag Reduction ◽  
Polymer Solution ◽  
Concentration Boundary Layer ◽  
Fourth Stage ◽  
Flat Plates ◽  
Concentration Boundary ◽  
Momentum Boundary Layer

The drag reduction due to polymer being emitted from a slot is analytically treated for the fourth stage for which the concentration boundary layer coincides with the momentum boundary layer.

Behaviour of biofilm systems under varying hydrodynamic conditions

2004 ◽  
Vol 49 (11-12) ◽  
pp. 345-351 ◽  
Author(s):  
A. León Ohl ◽  
H. Horn ◽  
D.C. Hempel
Keyword(s):  
Boundary Layer ◽  
Flow Velocity ◽  
Bulk Phase ◽  
Concentration Boundary Layer ◽  
Hydrodynamic Condition ◽  
Hydrodynamic Conditions ◽  
Concentration Boundary ◽  
Before And After ◽  
Biofilm Structure

Heterotrophic biofilms were cultivated in long-term experiments in biofilm tube reactors. During the biofilm cultivation the substrate loading of glucose was kept constant while the hydrodynamic conditions were changed stepwise. To describe the behaviour of the biofilm structure under these varying flow conditions the mass transfer and transport at the bulk/biofilm interface and inside the biofilm was investigated with oxygen microelectrodes. Furthermore, the biofilm density was used to describe the biofilm compactness before and after the change of the hydrodynamic condition. The obtained results show that the biofilm density and also the substrate flux decreased with decreasing flow velocity in the bulk phase. Additionally the slope of the oxygen concentration profiles decreased and the thickness of the concentration boundary layer increased. On the other hand, increasing the flow velocity in the bulk phase led both to a higher biofilm density and a higher maximum substrate flux. The biofilm surface became more homogenous and the thickness of the concentration boundary layer decreased. The time for adaptation of the biofilm structure after changing the hydrodynamic conditions ranged between 1 and 3 weeks.

J057045 Comparison of effect of concentration boundary layer on mass

2013 ◽  
Vol 2013 (0) ◽  
pp. _J057045-1-_J057045-2
Author(s):  
Masaya KONDO ◽  
Teppei TANAKA ◽  
Takahiro ITO ◽  
Yoshiyuki TSUJI
Keyword(s):  
Boundary Layer ◽  
Concentration Boundary Layer ◽  
Concentration Boundary

Analysis of concentration boundary layer in thallium (III) extraction with butyl acetate using membrane modules of different length

Desalination ◽  
2002 ◽  
Vol 148 (1-3) ◽  
pp. 241-246 ◽  
Author(s):  
Tatjana M. Trtić-Petrović ◽  
Goran T. Vladisavljević ◽  
Milica Tešic ◽  
Ksenija Kumrić ◽  
Jožef J. Čomor
Keyword(s):  
Boundary Layer ◽  
Butyl Acetate ◽  
Concentration Boundary Layer ◽  
Concentration Boundary ◽  
Membrane Modules
Sign in / Sign up

Export Citation Format

Share Document