Pressure drop and gas holdup in air–water flow in 180° return bends

2014 ◽  
Vol 61 ◽  
pp. 83-93 ◽  
Author(s):  
Pedro M. de Oliveira ◽  
Jader R. Barbosa
Keyword(s):  
Pressure Drop ◽  
Water Flow ◽  
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

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

Pressure Drop Characteristics of Water Flow Through Static Annular and Triangular Cavity Labyrinth Seals

2008 ◽  
Vol 2 (4) ◽  
pp. 482-495 ◽  
Author(s):  
S. P. Asok ◽  
K. Sankaranarayanasamy ◽  
T. Sundararajan ◽  
P. Starwin ◽  
R. Kalieswaran ◽  
...  
Keyword(s):  
Pressure Drop ◽  
Water Flow ◽  
Labyrinth Seals ◽  
Flow Through

Comprehensive analysis of the thermohydraulic performance of cooling networks subject to fouling and undergoing retrofit projects

2020 ◽  
pp. 0958305X2094531
Author(s):  
Hebert Lugo-Granados ◽  
Lázaro Canizalez-Dávalos ◽  
Martín Picón-Núñez
Keyword(s):  
Pressure Drop ◽  
Water Flow ◽  
Flow Rate ◽  
Fluid Velocity ◽  
Water Flow Rate ◽  
Volumetric Flow Rate ◽  
Cooling Capacity ◽  
Point Of View ◽  
Rate Distribution

The aim of this paper is to develop guidelines for the placing of new coolers in cooling systems subject to retrofit. The effects of the accumulation of scale on the flow system are considered. A methodology to assess the interconnected effect of local fluid velocity and fouling deposition is developed. The local average fluid velocity depends on the water flow rate distribution across the piping network. The methodology has four main calculation components: a) the determination of the flow rate distribution across the piping network, b) the prediction of fouling deposition, c) determination of the hydraulic changes and the effect on fouling brought about by the placing of new exchangers into an existing structure, and d) the calculation of the total cooling load and pressure drop of the system. The set of disturbances introduced to the system through fouling and the incorporation of new coolers, create network responses that eventually influence the cooling capacity and the pressure drop. In this work, these interactions are analysed using two case studies. The results indicate that, from the thermal point of view, the incorporation of new heat exchangers is recommended in series. The limit is the point where the increase of the total pressure drop causes a reduction in the overall volumetric flow rate. New coolers added in parallel create a reduction of pressure drop and an increase in the overall water flow rate; however, this increase is not enough to counteract the reduction of fluid velocity and heat capacity removal.

Numerical Evaluation of Pressure Drop Across Orifices for Different Gas-Liquid Mixtures

2018 ◽  
Author(s):  
Zurwa Khan ◽  
Reza Tafreshi ◽  
Matthew Franchek ◽  
Karolos Grigoriadis
Keyword(s):  
Numerical Model ◽  
Pressure Drop ◽  
Water Flow ◽  
Fuel Oil ◽  
Phase Flow ◽  
Empirical Correlations ◽  
Local Pressure ◽  
Two Phase ◽  
Pressure Drops ◽  
Mass Fractions

Modeling two-phase flow across orifices is critical in optimizing orifice design and fluid’s operation in countless architectures and machineries. While flow across different orifice geometries has been extensively studied for air-water flow, simulations and experiments on other two-phase flow combinations are limited. Since every fluid mixture has its own physical properties, such as densities, viscosities and surface tensions, the effect of these properties on the local pressure drops across the orifices may differ. This study aims to investigate the effect of different fluid combinations on the pressure drop across sharp-edged orifices with varying gas mass fractions, orifice thicknesses, and area ratios. A numerical model was developed and validated using experimental data for air-water flow. Then, the model was extended to include various gas-liquid flows including gasoil, argon-diesel and fuel oil. The local pressure drops were then estimated and compared with the existing empirical correlations. The developed model presents a unified approach to measure pressure drop across orifices for different fluid mixtures with different geometries and gas-liquid compositions, unlike existing empirical correlations which are applicable for specific orifice geometries. The results showed that Morris correlation, Simpson correlation, and Chisholm correlation are more appropriate for gasoil, argon-diesel and fuel oil mixtures, respectively. They also yielded that for all fluid combinations, increasing orifice thickness and area ratio led to a decrease in local pressure drop, while increasing gas mass fraction led to an increase in local pressure drop. This revealed that, despite having similar responses to changes in orifice geometries and gas fractions, unlike the assumption made by previous works on air-water flow, no empirical correlation is able to predict pressure drops for all flow mixtures, while the presented numerical model can efficiently determine the local pressure drop for all combinations of flow mixtures, orifice geometries and gas mass fractions.

scholarly journals Quantitative optimization of drainage strategy of coalbed methane well based on the dynamic behavior of coal reservoir permeability

2020 ◽  
Vol 10 (1) ◽  
Author(s):  
Xinlu Yan ◽  
Songhang Zhang ◽  
Shuheng Tang ◽  
Zhongcheng Li ◽  
Qian Zhang ◽  
...  
Keyword(s):  
Pressure Drop ◽  
Dynamic Behavior ◽  
Water Flow ◽  
Coalbed Methane ◽  
Single Phase ◽  
Reservoir Permeability ◽  
Geological Conditions ◽  
Cbm Production ◽  
Coal Reservoir ◽  
Flow Stage

AbstractThe development of coalbed methane (CBM) is not only affected by geological factors, but also by engineering factors, such as artificial fracturing and drainage strategies. In order to optimize drainage strategies for wells in unique geological conditions, the characteristics of different stages of CBM production are accurately described based on the dynamic behavior of the pressure drop funnel and coal reservoir permeability. Effective depressurization is achieved by extending the pressure propagation radius and gas desorption radius to the well-controlled boundary, in the single-phase water flow stage and the gas–water flow stage, respectively, with inter-well pressure interference accomplished in the single-phase gas flow stage. A mathematic model was developed to quantitatively optimize drainage strategies for each stage, with the maximum bottom hole flow pressure (BHFP) drop rate and the maximum daily gas production calculated to guide the optimization of CBM production. Finally, six wells from the Shizhuangnan Block in the southern Qinshui Basin of China were used as a case study to verify the practical applicability of the model. Calculation results clearly indicate the differences in production characteristics as a result of different drainage strategies. Overall, if the applied drainage strategies do not achieve optimal drainage results, the coal reservoir could be irreversibly damaged, which is not conducive to expansion of the pressure drop funnel. Therefore, this optimization model provides valuable guidance for rational CBM drainage strategy development and efficient CBM production.

Pressure Drop Measurements in Venturi Meters of Different Beta Ratios for Oil–Water Flow Experiments

2018 ◽  
Vol 43 (11) ◽  
pp. 6355-6374
Author(s):  
Mujahid O. Elobeid ◽  
Aftab Ahmad ◽  
Abdelsalam Al-Sarkhi ◽  
Luai M. Alhems ◽  
Syed M. Shaahid ◽  
...  
Keyword(s):  
Pressure Drop ◽  
Water Flow ◽  
Oil Water ◽  
Flow Experiments
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