Mass transfer from large single bubbles at high reynolds numbers

AIChE Journal ◽  
1967 ◽  
Vol 13 (4) ◽  
pp. 697-702 ◽  
Author(s):  
Takayuki Nate ◽  
D. M. Himmelblau
Keyword(s):  
Mass Transfer ◽  
Reynolds Numbers ◽  
High Reynolds Numbers ◽  
High Reynolds

Laminar Forced Convection Mass Transfer to Ordered and Disordered Single Layer Arrays of Micro-Spheres

2012 ◽  
Author(s):  
D. Ambesi ◽  
C. R. Kleijn
Keyword(s):  
Mass Transfer ◽  
Forced Convection ◽  
Sherwood Number ◽  
Single Layer ◽  
Reynolds Numbers ◽  
Frontal Area ◽  
High Reynolds Numbers ◽  
Schmidt Numbers ◽  
High Reynolds ◽  
Laminar Forced Convection

We study laminar forced convection mass transfer to single layer arrays of equidistantly and non-equidistantly spaced micro-spheres. We report average Sherwood numbers as a function of geometry and flow conditions, for open frontal area fractions between 0.04 and 0.95, Schmidt numbers between 0.7 and 10, and Reynolds numbers (based on micro-sphere diameter and the free stream velocity) between 0.1 and 100. For equidistantly spaced arrays of micro-spheres we propose a general analytical expression for the average Sherwood number as a function of the Reynolds number, Schmidt number and the open frontal area fraction, as well as asymptotic scaling rules for small and large Reynolds. For all studied Schmidt numbers, equidistant arrays exhibit decreasing average Sherwood numbers for decreasing open frontal area fractions at low Reynolds numbers. For high Reynolds numbers, the Sherwood number approaches that of a single spheres in cross-flow, independent of the open frontal area fraction. For equal open frontal area fractions, the Sherwood number in non-equidistant arrays is lower than in equidistant arrays for intermediate Reynolds numbers. For very low and high Reynolds numbers, non-uniformity does not influence mass transfer.

Mass transfer in wetted-wall columns: Correlations at high Reynolds numbers

1998 ◽  
Vol 53 (3) ◽  
pp. 495-503 ◽  
Author(s):  
Christian H.E. Nielsen ◽  
Søren Kiil ◽  
Henrik W. Thomsen ◽  
Kim Dam-Johansen
Keyword(s):  
Mass Transfer ◽  
Reynolds Numbers ◽  
High Reynolds Numbers ◽  
High Reynolds

An Experimental Study of the Friction Factor and Mass Transfer Performance of an Offset-Strip Fin Array at Very High Reynolds Numbers

2007 ◽  
Vol 129 (9) ◽  
pp. 1134-1140 ◽  
Author(s):  
Gregory J. Michna ◽  
Anthony M. Jacobi ◽  
Rodney L. Burton
Keyword(s):  
Mass Transfer ◽  
Reynolds Number ◽  
Friction Factor ◽  
Heat Exchangers ◽  
Reynolds Numbers ◽  
Transfer Performance ◽  
High Reynolds Numbers ◽  
High Reynolds ◽  
Offset Strip Fin ◽  
Very High

Thermal-hydraulic performance data for offset-strip fin arrays are readily available in the range Re<10,000. However, in emerging applications in automotive and aerospace systems, where fan power is not a constraint and compactness is important, it may be desirable to operate offset-strip fin heat exchangers at very high Reynolds numbers. In this paper, friction factor and mass transfer performance of an offset-strip fin array at Reynolds numbers between 10,000 and 120,000 are characterized. A scale-model, eight-column fin array is used in pressure drop and naphthalene sublimation experiments, and the data are compared to predictions of performance given by available analytical models and extrapolations of the best available correlations. The friction factor data follow the correlation-predicted trend of decreasing monotonically as the Reynolds number is increased to 20,000. However, at higher Reynolds numbers, the friction factor increases as the Reynolds number increases and local maxima are observed in the data. Over the range investigated, the modified Colburn j factor decreases monotonically as the Reynolds number increases. For Reynolds numbers in the range 10,000<Re<120,000, well beyond that covered by state-of-the-art correlations, both the friction factor and Colburn j factor are roughly twice that predicted by extrapolating the best available correlations. The higher-than-predicted Colburn j factor at very high Reynolds numbers is encouraging for the use of offset-strip fin heat exchangers in emerging applications where compactness is of high importance.

TRANSONIC CROSS FLOW (M∞ = 0.8) OVER A CIRCULAR CYLINDER AT HIGH REYNOLDS NUMBERS

2012 ◽  
Vol 43 (5) ◽  
pp. 589-613
Author(s):  
Vyacheslav Antonovich Bashkin ◽  
Ivan Vladimirovich Egorov ◽  
Ivan Valeryevich Ezhov ◽  
Sergey Vladimirovich Utyuzhnikov
Keyword(s):  
Circular Cylinder ◽  
Cross Flow ◽  
Reynolds Numbers ◽  
High Reynolds Numbers ◽  
High Reynolds

Oscillatory control of separation at high Reynolds numbers

AIAA Journal ◽  
1999 ◽  
Vol 37 ◽  
pp. 1062-1071 ◽  
Author(s):  
A. Seifert ◽  
L. G. Pack
Keyword(s):  
Reynolds Numbers ◽  
High Reynolds Numbers ◽  
High Reynolds

Turbulent vortex breakdown at high Reynolds numbers

AIAA Journal ◽  
2000 ◽  
Vol 38 ◽  
pp. 825-834
Author(s):  
F. Novak ◽  
T. Sarpkaya
Keyword(s):  
Vortex Breakdown ◽  
Reynolds Numbers ◽  
Turbulent Vortex ◽  
High Reynolds Numbers ◽  
High Reynolds
Sign in / Sign up

Export Citation Format

Share Document