Modeling and experimental study of pore structure in melt-blown fiber assembly

2021 ◽  
pp. 152808372110117
Author(s):  
Guangwu Sun ◽  
Yu Chen ◽  
Yanwen Ruan ◽  
Guanzhi Li ◽  
Wenfeng Hu ◽  
...  
Keyword(s):  
Pore Size ◽  
Flow Rate ◽  
Movement Speed ◽  
Polymer Flow ◽  
Fiber Assembly ◽  
Virtual Production ◽  
Air Jet ◽  
Die Temperature ◽  
Pressure Suction ◽  
Production Conditions

It is widely known that the pore size of a meltblown fiber assembly extensively affects the final applications of its products. We have developed a model for simulating melt-blowing production to investigate the formation mechanism of a fiber assembly. In this study, we calculated the pore size under different production conditions using the model. The predicted results reveal the relationship between the pore size and the production conditions, namely, the air jet pressure, suction pressure, die temperature, polymer flow rate, die to collector distance, and collector speed. The predicted results also verified the experimental trends reported in previous studies. High air jet pressure and die temperature tend to generate smaller pores, while a large polymer flow rate, die to collector distance, and collector movement speed contribute to the production of larger pores in the fiber assembly. In addition, the circularity was predicted in this study to describe the pore shape. The numerical investigation of virtual production is a novel method in which the expected pore size and corresponding production conditions can be easily obtained using a computer with a few keystrokes and mouse clicks.

scholarly journals Foaming of industrial lean methyldiethanolamine solution in the presence of hydrocarbon and fatty acid based corrosion inhibitors

2018 ◽  
Vol 73 ◽  
pp. 76 ◽  
Author(s):  
Mohammad Keewan ◽  
Fawzi Banat ◽  
Priyabrata Pal ◽  
Jerina Zain ◽  
Emad Alhseinat
Keyword(s):  
Fatty Acid ◽  
Pore Size ◽  
Corrosion Inhibitor ◽  
Flow Rate ◽  
Gas Flow ◽  
Corrosion Inhibitors ◽  
Liquid Volume ◽  
Operating Parameters ◽  
Time Flow ◽  
Foaming Time

In natural gas sweetening alkanolamine processes one of the regularly used chemical is the corrosion inhibitor. For better operation of the plant it is essential to understand the effect of their presence on foaming of industrial lean Methyldiethanolamine (MDEA) used as solvents at different temperatures. This study aimed at investigating the effect of HydroCarbon Based (HCB) and fatty acid based corrosion inhibitor having chemical name Bis(2-Hydroxyethyl)Cocoalkylamine (BHCL) on the foaming tendency of industrial real lean MDEA solutions. Experiments were conducted with different operating parameters, including liquid volume of the solution, foaming time, flow rate of nitrogen gas, concentration of the corrosion inhibitors, temperature of the solution, and gas diffuser pore size using the Foam Scan instrument. With the increase in solution volume and foaming time foaming happens to be more. The foaming tendency of lean MDEA solutions decreased with increasing temperature in absence of corrosion inhibitors but showed different behavior in their presence. At small diffuser pore size and high gas flow rate, the final foam volume increased in the presence of HCB but decreased with the BHCL inhibitor. Optimizing the operating parameters to minimize foaming was verified to be a function of the type of inhibitor used.

Effects of porous electrode pore size and operating flow rate on the energy production of capacitive energy extraction

2020 ◽  
Vol 155 ◽  
pp. 278-285
Author(s):  
Muhammad Nasir ◽  
Yuji Nakanishi ◽  
Anindityo Patmonoaji ◽  
Tetsuya Suekane
Keyword(s):  
Pore Size ◽  
Flow Rate ◽  
Energy Production ◽  
Porous Electrode ◽  
Energy Extraction

scholarly journals Effects of Flow Rate and Pore Size on Mud Transport in Sand Beds

2011 ◽  
Vol 67 (2) ◽  
pp. I_971-I_975
Author(s):  
Narong TOUCH ◽  
Shinya NAKASHITA ◽  
Takeshi KOEDA ◽  
Tadashi HIBINO
Keyword(s):  
Pore Size ◽  
Flow Rate ◽  
Mud Transport ◽  
Sand Beds

Bubble Removal in Microfluidic Devices Using Nanofibrous Membranes

2014 ◽  
Author(s):  
Ravindra Vundavilli ◽  
Jeff Darabi
Keyword(s):  
Pore Size ◽  
Flow Rate ◽  
Liquid Flow ◽  
Liquid Flow Rate ◽  
Microfluidic Devices ◽  
Channel Height ◽  
Hydrophobic Membrane ◽  
Fluidic Channel ◽  
Nanofibrous Membranes ◽  
Bubble Removal

This paper presents an experimental study to determine bubble removal characteristics of nanofibrous membranes in microfluidic devices. It is well known that the presence of gas bubbles in fluidic channels can cause significant flow disturbances and adversely affect the overall performance and operation of microfluidic devices. In this study, a microfluidic device is designed and fabricated to generate and extract bubbles from a microfluidic channel. A T-junction is used to produce controllable bubbles at the entrance of fluidic channel. The generated bubbles are then transported to a bubble removal region and vented through a highly porous hydrophobic membrane. Four different hydrophobic PTFE membranes with different pore sizes ranging from 0.45 to 3 μm were used to permeate air bubbles. The fluidic channel width was 500 μm and channel height ranged from 100 to 300 μm. The effects of pore size, channel height, and liquid flow rate on the bubble removal rate are investigated. The results reveal that the rate of bubble removal increases with increasing the pore size and channel height but decreases with increasing the liquid flow rate.

Optimisation of air-jet vortex generators with respect to system design parameters

1999 ◽  
Vol 103 (1028) ◽  
pp. 475-480 ◽  
Author(s):  
T. P. Bray ◽  
K. P. Garry
Keyword(s):  
Mass Flow Rate ◽  
Mass Flow ◽  
Flow Rate ◽  
Vortex Generator ◽  
Design Parameters ◽  
Air Jet ◽  
System Input ◽  
System Requirements ◽  
Jet Nozzle ◽  
Definition Of

Abstract A simple technique is proposed that allows the definition of the geometry and characteristics of an air-jet vortex generator to be defined, using the system requirements in practical design. Typically, the aircraft designer is concerned with the mass flow-rate and air pressure requirements of any pneumatic system for inclusion to an airframe. These parameters are not congruent with those for air-jet vortex generator aerodynamic design, and therefore, some tool is required to bridge the gap. Such a tool is proposed, based on empirical methods for the prediction of air-jet vortex generator behaviour. The technique allows the comparison of the vortex strength, and the system inputs (the jet mass flow-rate and the air-jet plenum pressure) for the air-jet, for a range of jet nozzle diameters and jet velocity ratios. Through this comparison, the optimum air-jet design can be reached for a given system input.

Carwash wastewater treatment by micro and ultrafiltration membranes: Effects of geometry, pore size, pressure difference and feed flow rate in transport properties

2017 ◽  
Vol 17 ◽  
pp. 143-148 ◽  
Author(s):  
Alinne Clície Salgueiro Pinto ◽  
Luiza de Barros Grossi ◽  
Rafael Alvarenga Carvalho de Melo ◽  
Thalles Macedo de Assis ◽  
Vanessa Mendes Ribeiro ◽  
...  
Keyword(s):  
Wastewater Treatment ◽  
Pore Size ◽  
Transport Properties ◽  
Flow Rate ◽  
Pressure Difference ◽  
Feed Flow Rate ◽  
Ultrafiltration Membranes

Preliminary Study on the Fabrication Mechanism of Nanofibers in the Melt Splitting Process

2013 ◽  
Vol 23 ◽  
pp. 92-95
Author(s):  
Li Li Wu ◽  
Yuan Ling Cheng ◽  
Ting Chen
Keyword(s):  
Flow Rate ◽  
Polymer Melt ◽  
Air Pressure ◽  
Polymer Flow ◽  
Splitting Technique ◽  
Filament Diameter ◽  
Preliminary Study ◽  
A New Technique ◽  
Surface Wave Method ◽  
Splitting Process

Melt splitting is a new technique for the mass production of nanofibers. The polymer melt split radially into several hundred very fine filaments in a specially designed nozzle. The prediction model for filament diameter after splitting in the melt splitting process is established based on the surface wave method. The predicted filament diameter compares favorably with the experimental data. Effects of the air pressure and polymer flow rate on the filament diameter are studied. It is found that larger air pressure and smaller polymer flow rate can all produce finer filaments. The results provide a good foundation for the optimization of the melt splitting technique.

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