Characterization of Pipe-Flow Turbulence and Mass Transfer in a Curved Swirling Flow Behind an Orifice

2015 ◽  
pp. 225-235
Author(s):  
N. Fujisawa ◽  
R. Watanabe ◽  
T. Yamagata ◽  
N. Kanatani
Keyword(s):  
Mass Transfer ◽  
Pipe Flow ◽  
Swirling Flow ◽  
Flow Turbulence

Characterization of dissolved material during the initial phase of softwood kraft pulping

TAPPI Journal ◽  
2013 ◽  
Vol 12 (1) ◽  
pp. 37-43 ◽  
Author(s):  
HANNU PAKKANEN ◽  
TEEMU PALOHEIMO ◽  
RAIMO ALÉN
Keyword(s):  
Mass Transfer ◽  
Molecular Mass ◽  
Initial Phase ◽  
Degradation Products ◽  
Kraft Pulping ◽  
Reaction Products ◽  
Cooking Temperature ◽  
Molecular Masses ◽  
Aliphatic Carboxylic Acids

The influence of various cooking parameters, such as effective alkali, cooking temperature, and cooking time on the formation of high molecular mass lignin-derived and low molecular mass carbohydrates-derived (aliphatic carboxylic acids) degradation products, mainly during the initial phase of softwood kraft pulping was studied. In addition, the mass transfer of all of these degradation products was clarified based on their concentrations in the cooking liquor inside and outside of the chips. The results indicated that the degradation of the major hemicellulose component, galactoglucomannan, typically was dependent on temperature, and the maximum degradation amount was about 60%. In addition, about 60 min at 284°F (140°C) was needed for leveling off the concentrations of the characteristic reaction products (3,4-dideoxy-pentonic and glucoisosaccharinic acids) between these cooking liquors. Compared with low molecular mass aliphatic acids, the mass transfer of soluble lignin fragments with much higher molecular masses was clearly slower.

Mass transfer downstream of nozzles in turbulent pipe flow with varying Schmidt number

1987 ◽  
Vol 17 (6) ◽  
pp. 1118-1128 ◽  
Author(s):  
S. M. Chouikhi ◽  
M. A. Patrick ◽  
A. A. Wragg
Keyword(s):  
Mass Transfer ◽  
Pipe Flow ◽  
Schmidt Number ◽  
Turbulent Pipe Flow

Characterization of acoustic sources in a corrugated pipe flow with linear stochastic estimation

2021 ◽  
Vol 150 (6) ◽  
pp. 4268-4282
Author(s):  
Gaëtan Galeron ◽  
Muriel Amielh ◽  
Pierre-Olivier Mattei
Keyword(s):  
Pipe Flow ◽  
Stochastic Estimation ◽  
Linear Stochastic Estimation ◽  
Acoustic Sources
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