scholarly journals Effect of hot calendering on physical properties and water vapor transfer resistance of bacterial cellulose films

2016 ◽  
Vol 51 (21) ◽  
pp. 9562-9572 ◽  
Author(s):  
V. L. D. Costa ◽  
A. P. Costa ◽  
M. E. Amaral ◽  
C. Oliveira ◽  
M. Gama ◽  
...  
Keyword(s):  
Water Vapor ◽  
Physical Properties ◽  
Bacterial Cellulose ◽  
Transfer Resistance ◽  
Cellulose Films ◽  
Vapor Transfer ◽  
Water Vapor Transfer

Effects of Peg Additives on Water Vapor Permeability of Porous PVDF Membranes

2009 ◽  
Author(s):  
Li-zhi Zhang ◽  
Li-xia Pei
Keyword(s):  
Water Vapor ◽  
Polyvinylidene Fluoride ◽  
Water Vapor Permeability ◽  
Vapor Permeability ◽  
Transfer Resistance ◽  
Molecular Weights ◽  
Vapor Transfer ◽  
And Performance ◽  
Water Vapor Transfer ◽  
Permeation Test

Porous polyvinylidene fluoride (PVDF) membranes with various structures were prepared via phase inversion using DMF as solvent. Polyethylene glycols (PEG) with three different concentrations and molecular weights were used. Effects of PEG on the structure and performance of porous membranes were investigated. The morphology and structure of the prepared membrane were characterized by scanning electron microscopy (SEM). The water vapor permeability through membranes was evaluated by permeation test. The results showed that PEG was used as pore forming agent in PVDF/DMF/H2O system. Moreover, it has great influences on morphology and water vapor permeability. The membranes becomes more porous with PEG additives. Water vapor transfer resistance was reduced, which leads to improved water vapor permeability.

scholarly journals Heat and Water Vapor Transfer between Atmosphere and Pavement Surface Under Dry, Wet, Ice Plate and Packed Snow State

2006 ◽  
Vol 22 (3) ◽  
pp. 220-228 ◽  
Author(s):  
Akihiro Fujimoto ◽  
Hiroshi Watanabe ◽  
Teruyuki Fukuhara ◽  
Takeshi Sato ◽  
Masaki Nemoto ◽  
...  
Keyword(s):  
Water Vapor ◽  
Pavement Surface ◽  
Vapor Transfer ◽  
Water Vapor Transfer

scholarly journals Dynamic Simulation Modeling of Heat and Water Vapor Transfer in a Fluid-Roof Greenhouse.

2001 ◽  
Vol 57 (4) ◽  
pp. 169-182 ◽  
Author(s):  
Ahmed M. ABDEL-GHANY ◽  
Toyoki KOZAI ◽  
Nabil Y. ABDEL-SHAFI ◽  
Ibrahem S. TAHA ◽  
Ahmed S. HUZAYYIN
Keyword(s):  
Water Vapor ◽  
Dynamic Simulation ◽  
Simulation Modeling ◽  
Vapor Transfer ◽  
Water Vapor Transfer

scholarly journals Heat and water vapor transfer in the wake of a falling ice sphere and its implication for secondary ice formation in clouds

2019 ◽  
Vol 21 (4) ◽  
pp. 043043 ◽  
Author(s):  
Agathe Chouippe ◽  
Michael Krayer ◽  
Markus Uhlmann ◽  
Jan Dušek ◽  
Alexei Kiselev ◽  
...  
Keyword(s):  
Water Vapor ◽  
Ice Formation ◽  
Vapor Transfer ◽  
Water Vapor Transfer

Water Vapor Transfer in the Soil by Thermal Gradients and Its Control

1963 ◽  
Vol 6 (3) ◽  
pp. 0244-0248 ◽  
Author(s):  
R. K. Matthes ◽  
Jr. and H. D. Bowen
Keyword(s):  
Water Vapor ◽  
Thermal Gradients ◽  
Vapor Transfer ◽  
Water Vapor Transfer

scholarly journals Effect of Air Gap Entrapped in Firefighter Protective Clothing on Thermal Resistance and Evaporative Resistance

2018 ◽  
Vol 18 (1) ◽  
pp. 28-34 ◽  
Author(s):  
Hualing He ◽  
Zhicai Yu
Keyword(s):  
Water Vapor ◽  
Thermal Resistance ◽  
Ambient Temperature ◽  
Protective Clothing ◽  
Air Gap ◽  
Evaporative Resistance ◽  
Vapor Transfer ◽  
Thermal Protective Clothing ◽  
Fabric System ◽  
Water Vapor Transfer

Abstract Heat and water vapor transfer behavior of thermal protective clothing is greatly influenced by the air gap entrapped in multilayer fabric system. In this study, a sweating hot plate method was used to investigate the effect of air gap position and size on thermal resistance and evaporative resistance of firefighter clothing under a range of ambient temperature and humidity. Results indicated that the presence of air gap in multilayer fabric system decreased heat and water vapor transfer abilities under normal wear. Moreover, the air gap position slightly influenced the thermal and evaporative performances of the firefighter clothing. In this study, the multilayer fabric system obtained the highest thermal resistance, when the air space was located at position B. Furthermore, the effect of ambient temperature on heat and water vapor transfer properties of the multilayer fabric system was also investigated in the presence of a specific air gap. It was indicated that ambient temperature did not influence the evaporative resistance of thermal protective clothing. A thermographic image was used to test the surface temperature of multilayer fabric system when an air gap was incorporated. These results suggested that a certain air gap entrapped in thermal protective clothing system could affect wear comfort.

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