Effects of Insert Edge Design and Insertion and Sealing Techniques on Soil Air Permeability Measurement

1996 ◽  
Vol 39 (4) ◽  
pp. 1269-1273 ◽  
Author(s):  
P. Liang ◽  
C. G. Bowers Jr. ◽  
H. D. Bowen
Keyword(s):  
Air Permeability ◽  
Permeability Measurement ◽  
Soil Air

The Forchheimer Approach for Soil Air Permeability Measurement

2017 ◽  
Vol 81 (5) ◽  
pp. 1045-1053 ◽  
Author(s):  
Per Schjønning ◽  
Michael Koppelgaard
Keyword(s):  
Air Permeability ◽  
Permeability Measurement ◽  
Soil Air

Effects of concentrated application of soil conditioners on soil–air permeability and absorption of nitrogen by young peach trees

2018 ◽  
Vol 64 (3) ◽  
pp. 423-432 ◽  
Author(s):  
Yuansong Xiao ◽  
Yan Peng ◽  
Futian Peng ◽  
Yafei Zhang ◽  
Wen Yu ◽  
...  
Keyword(s):  
Air Permeability ◽  
Soil Air ◽  
Soil Conditioners ◽  
Peach Trees

scholarly journals On the use of the similar media concept for scaling soil air permeability

Geoderma ◽  
2014 ◽  
Vol 235-236 ◽  
pp. 154-162 ◽  
Author(s):  
Tiejun Wang ◽  
Xunhong Chen ◽  
Anh Minh Tang ◽  
Yu-Jun Cui
Keyword(s):  
Air Permeability ◽  
Soil Air

Effects of Confining Pressure on Unsteady-State Air Permeability Measurement Method in an Aggregated Andisol

2016 ◽  
Vol 15 (3) ◽  
pp. vzj2015.05.0081 ◽  
Author(s):  
Toru Nakajima ◽  
Hirotaka Saito ◽  
Seishu Tojo ◽  
Qinhong Hu
Keyword(s):  
Measurement Method ◽  
Confining Pressure ◽  
Air Permeability ◽  
Unsteady State ◽  
Permeability Measurement

Estimation of soil air permeability components at a laboratory-scale pilot

2012 ◽  
Vol 33 (19) ◽  
pp. 2223-2228 ◽  
Author(s):  
Otmane Boudouch ◽  
Daoud Esrael ◽  
Mariem Kacem ◽  
Belkacem Benadda
Keyword(s):  
Air Permeability ◽  
Laboratory Scale ◽  
Soil Air

scholarly journals Correlation of Air Permeability to Other Breathability Parameters of Textiles

Polymers ◽  
2021 ◽  
Vol 14 (1) ◽  
pp. 140
Author(s):  
Karel Adámek ◽  
Antonin Havelka ◽  
Zdenek Kůs ◽  
Adnan Mazari
Keyword(s):  
Water Vapour ◽  
Air Permeability ◽  
Water Vapour Permeability ◽  
Textile Material ◽  
Permeability Measurement ◽  
Smart Textiles ◽  
Vapour Permeability ◽  
Clothing Comfort ◽  
Strong Relation ◽  
Water Vapour Resistance

In the field of textile comfort of smart textiles, the breathability of the material is very important. That includes the flow of air, water and water vapours through the textile material. All these experiments are time consuming and costly; only air permeability is much faster and economical. The research is performed to find correlation between these phenomena of breathability and to predict the permeability based on only the air permeability measurement. Furthermore, it introduces a new way of expressing the Ret (water vapour resistance) unit according to SI standards as it is connected with the air permeability of garments. The need to find a correlation between air permeability and water vapour permeability is emphasised in order to facilitate the assessment of clothing comfort. The results show that there is a strong relation between air permeability and water vapour permeability for most of the textile material.

In-Situ Measurement and Monitoring of Fiber Preform Permeability for Liquid Composite Molding

2000 ◽  
Author(s):  
Zhiyong Liang ◽  
Chuck Zhang ◽  
Ben Wang ◽  
Chiang Shih
Keyword(s):  
Gas Flow ◽  
Gas Permeability ◽  
Pressure Profile ◽  
Air Permeability ◽  
Experimental Results ◽  
Liquid Composite Molding ◽  
Permeability Measurement ◽  
Fiber Preform ◽  
Composite Molding

Abstract In a liquid composite molding (LCM) process such as resin transfer molding (RTM), quality control depends on an in-situ permeability profile of the fibrous preform taken just before resin injection. However, the conventional permeability measurement method, which uses liquid (oil or resin) as its working fluid, only measures the average preform permeability in an off-line mode. It cannot be used to create an in-situ permeability profile because of fiber pollution, and cannot be used to reveal local permeability variations of preform. This study develops a new permeability characterization method that uses gas flow and pressure profiles to measure preform permeability variation in a closed mold assembly. This method is based upon two research findings: (1) that the air permeability of a preform can be obtained through measuring the pressure profile of gas flow, and (2) that resin permeability is highly correlated with air permeability for the same fiber preform. In this paper, the validity of this method is discussed. Experimental results of gas permeability measurement with defective and defect-free preforms are presented, and quantitative models for correlation of gas permeability versus pressure profile and of gas permeability versus resin permeability are also provided. Finally, the efficacy of the proposed method is illustrated through experimental results.

Air‐Permeability Measurement for Soil at Low and High Pressure

1994 ◽  
Vol 120 (5) ◽  
pp. 1337-1343 ◽  
Author(s):  
Shawn A. Rodeck ◽  
Bruce A. DeVantier ◽  
Braja M. Das
Keyword(s):  
High Pressure ◽  
Air Permeability ◽  
Permeability Measurement
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