scholarly journals GAS HOLDUP AND PRESSURE DROP IN A MULTISTAGE VIBRATING DISK COLUMN WITH COCURRENT GAS-LIOUID FLOW

1974 ◽  
Vol 7 (2) ◽  
pp. 123-126 ◽  
Author(s):  
KAKUJI TOJO ◽  
KEI MIYANAMI ◽  
TAKEO YANO
Keyword(s):  
Pressure Drop ◽  
Gas Holdup

Gas holdup and pressure drop for air-water flow through plate bubble columns

1986 ◽  
Vol 64 (3) ◽  
pp. 387-392 ◽  
Author(s):  
B. H. Chen ◽  
N. S. Yang ◽  
A. F. Mcmillan
Keyword(s):  
Pressure Drop ◽  
Water Flow ◽  
Gas Holdup ◽  
Bubble Columns ◽  
Flow Through

Modeling of Gas Holdup and Pressure Drop Using ANN for Gas-Non-Newtonian Liquid Flow in Vertical Pipe

2014 ◽  
Vol 917 ◽  
pp. 244-256 ◽  
Author(s):  
Nirjhar Bar ◽  
Sudip Kumar Das
Keyword(s):  
Pressure Drop ◽  
Liquid Flow ◽  
Multilayer Perceptron ◽  
Transfer Functions ◽  
Gas Holdup ◽  
Newtonian Liquid ◽  
Training Algorithms ◽  
Vertical Pipe ◽  
Frictional Pressure Drop ◽  
Hidden Layer

This paper is an attempt to compare the the performance of the three different Multilayer Perceptron training algorithms namely Backpropagation, Scaled Conjugate Gradient and Levenberg-Marquardt for the prediction of the gas hold up and frictional pressure drop across the vertical pipe for gas non-Newtonian liquid flow from our earlier experimental data. The Multilayer Perceptron consists of a single hidden layer. Four different transfer functions were used in the hidden layer. All three algorithms were useful to predict the gas holdup and frictional pressure drop across the vertical pipe. Statistical analysis using Chi-square test (χ2) confirms that the Backpropagation training algorithm gives the best predictability for both cases.

scholarly journals Gas holdup and pressure drop in three-phase vertical flows of gas-liquid-fine solid particles system.

1986 ◽  
Vol 19 (1) ◽  
pp. 56-61 ◽  
Author(s):  
YASUO HATATE ◽  
HIROSHI NOMURA ◽  
TAKANORI FUJITA ◽  
SHUICHI TAJIRI ◽  
NOBUYUKI HIDAKA ◽  
...  
Keyword(s):  
Pressure Drop ◽  
Gas Holdup ◽  
Solid Particles ◽  
Three Phase

scholarly journals Gas holdup and pressure drop in three-phase horizontal flows of gas-liquid-fine solid particles system.

1986 ◽  
Vol 19 (4) ◽  
pp. 330-335 ◽  
Author(s):  
YASUO HATATE ◽  
HIROSHI NOMURA ◽  
TAKANORI FUJITA ◽  
SHUICHI TAJIRI ◽  
ATSUSHI IKARI
Keyword(s):  
Pressure Drop ◽  
Gas Holdup ◽  
Solid Particles ◽  
Three Phase ◽  
Horizontal Flows

Gas Holdup Characteristics in a Tapered Bubble Column

2003 ◽  
Vol 1 (1) ◽  
Author(s):  
Kai Zhang ◽  
Yulong Zhao ◽  
Bijiang Zhang
Keyword(s):  
Pressure Drop ◽  
Bubble Column ◽  
Particle Diameter ◽  
Liquid System ◽  
Gas Holdup ◽  
Internal Diameter ◽  
Slurry Concentration ◽  
The Difference ◽  
Bed Expansion ◽  
Solid System

Gas holdup characteristics were explored experimentally in a tapered bubble column of 3.00m height. The internal diameter increased from 0.10 m at the bottom to 0.20 m at the top. Two gas holdup characteristic parameters investigated were local gas holdup and overall gas holdup. Local gas holdup was measured by pressure drop method whilst overall gas holdup was measured by both pressure drop and bed expansion techniques. Axial gas holdup profile decreased from the bottom to the top in the range of the experiments. Overall gas holdup reached a maximum in transitional regime for either the gas-liquid system or the gas-liquid-solid system with low slurry concentration, but increased monotonically for gas-liquid-solid system with high slurry concentration. Overall gas holdup decreased with increasing static slurry height or solid concentration. The effect of particle diameter on gas holdup was too insignificant to be considered. Experiments were carried out in a cylindrical column to compare the difference between cylindrical and tapered bubble columns. Moreover, an empirical correlation was presented to estimate overall gas holdup in the tapered slurry bubble column (TSBC).

scholarly journals CFD Study of Gas Holdup and Frictional Pressure Drop of Vertical Riser Inside IC Reactor

Processes ◽  
2019 ◽  
Vol 7 (12) ◽  
pp. 936 ◽  
Author(s):  
Sheng Wang ◽  
He Dong ◽  
Zhongfeng Geng ◽  
Xiuqin Dong
Keyword(s):  
Pressure Drop ◽  
Flow Rate ◽  
Phase Interface ◽  
Gas Holdup ◽  
Circulation System ◽  
Circulation Flow ◽  
Internal Circulation ◽  
Frictional Pressure Drop ◽  
Volumetric Loading ◽  
Circulation Flow Rate

The internal circulation system in Internal Circulation (IC) reactor plays an important role in increasing volumetric loading rate and promoting the mixing between sludge and wastewater. In order to design the internal circulation system, the flow behaviors of gas-liquid inside vertical riser should be studied in detail. In the present study, the Multiple Flow Regimes model is adopted to capture the phase interface for different flow conditions. The flow patterns, internal circulation flow rate, gas holdup, and frictional pressure drop of vertical riser are investigated. The results show that the bubble flow inside a vertical riser is in a stable flow condition. There exists a maximum value for internal circulation flow rate with the increasing superficial gas velocity. The parameters of Martinelli models for gas holdup and frictional pressure drop are improved based on Computational Fluid Dynamics (CFD) results. The deviations between the calculated gas holdup and frictional pressure drop by improved model and experimental value are reduced to 14% and 13.2%, respectively. The improved gas holdup and frictional pressure drop model can be used for the optimal design of internal circulation system.

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