Studies of polymer electrets. III. Charge decay behavior in polar polymer homoelectrets

1982 ◽  
Vol 27 (6) ◽  
pp. 1967-1975 ◽  
Author(s):  
Anu Mishra
Keyword(s):  
Charge Decay ◽  
Polar Polymer ◽  
Decay Behavior ◽  
Polymer Electrets

scholarly journals Monomorphs, bimorphs, and multimorphs from polar polymer electrets

1999 ◽  
Vol 29 (2) ◽  
pp. 306-317 ◽  
Author(s):  
Simona Bauer-Gogonea ◽  
Siegfried Bauer ◽  
Reimund Gerhard-Multhaupt
Keyword(s):  
Polar Polymer ◽  
Polymer Electrets

Charge Trapping in Polymer Electrets with Highly Dilute Blended Arylamine Donors

2021 ◽  
Author(s):  
Evan C. Plunkett ◽  
Qingyang Zhang ◽  
Howard E. Katz ◽  
Daniel H. Reich
Keyword(s):  
Charge Trapping ◽  
Polymer Electrets

scholarly journals Electret Filters—From the Influence of Discharging Methods to Optimization Potential

Atmosphere ◽  
2021 ◽  
Vol 12 (1) ◽  
pp. 65
Author(s):  
Maximilian Kerner ◽  
Kilian Schmidt ◽  
Stefan Schumacher ◽  
Christof Asbach ◽  
Sergiy Antonyuk
Keyword(s):  
Fine Particles ◽  
Operating Time ◽  
Filtration Efficiency ◽  
Long Term Stability ◽  
Aerosol Filtration ◽  
Charge Decay ◽  
The One ◽  
Testing Standards ◽  
Discharge Efficiency

Electret filters are electrostatically charged nonwovens which are commonly used in aerosol filtration to remove fine particles from gases. It is known that the charge and thus also the filtration efficiency can degrade over time. Thus, many testing standards require to remove the charge by treatment with liquid isopropanol (IPA) or IPA-saturated air. However, the parameters influencing this discharge have not been completely clarified yet. The aim of this work was, on the one hand, to experimentally investigate the influence of the IPA treatment on different electret filters and, on the other hand, to show the optimization potential of electret filters with respect to efficiency and long-term stability by numerical simulations. The experiments revealed that the air permeability is a central influencing parameter. Small pores lead to a reduced discharge efficiency using liquid IPA, while both treatment methods are suitable for larger pores. The simulations showed that a homogeneous charge distribution within the filter depth is advantageous for the initial performance. In contrast, charge penetrating deeper in the filter medium delays the charge decay and thus increases the operating time, with the trade-off of a lower initial performance.

Study on the decay behavior of the stability of asphalt mixture under different dry-wet cycle conditions

2021 ◽  
Vol 296 ◽  
pp. 123307
Author(s):  
Jing Lu ◽  
Mingyang Gong ◽  
Jingyun Chen ◽  
Dong Zhang ◽  
Zuoqiang Liu
Keyword(s):  
Asphalt Mixture ◽  
The Stability ◽  
Decay Behavior

scholarly journals Polymer electrets and their applications

2020 ◽  
pp. 50406
Author(s):  
Xin Li ◽  
Yurui Wang ◽  
Minxuan Xu ◽  
Yueqin Shi ◽  
Hemiao Wang ◽  
...  
Keyword(s):  
Polymer Electrets

The strengthening of polar polymer blends with small carbon additives and the relaxation properties of the blends

2014 ◽  
Vol 56 (3) ◽  
pp. 346-351 ◽  
Author(s):  
R. B. Tkhakakhov ◽  
A. G. Pshikhachev ◽  
L. V. Baragunova ◽  
Ya. Al-Khaulani
Keyword(s):  
Polymer Blends ◽  
Relaxation Properties ◽  
Carbon Additives ◽  
Polar Polymer

On Prediction and Unified Correlation for Decay of Vertical Buoyant Jets

1979 ◽  
Vol 101 (3) ◽  
pp. 532-537 ◽  
Author(s):  
C. J. Chen ◽  
C. H. Chen
Keyword(s):  
Kinetic Energy ◽  
Scaling Law ◽  
Flow Characteristics ◽  
Heat Fluxes ◽  
Buoyant Jets ◽  
Numerical Result ◽  
Plume Region ◽  
Unified Scaling Law ◽  
Rate Of Dissipation ◽  
Decay Behavior

A differential turbulence model is used to predict the decay behavior of turbulent buoyant jets in a uniform environment at rest. The turbulent stresses and heat fluxes are modeled by the algebraic expressions while the differential transport equations are solved for the kinetic energy of turbulence, k, the rate of dissipation of turbulence kinetic energy, ε, and the fluctuating temperature T′2. The numerical result correlated with a unified scaling law was shown to fall into a single curve for the flows beyond the zone of flow establishment. The flow characteristics are then classified into a non-buoyant region, an intermediate region and a plume region. The predicted results show that the buoyant jets is accelerated in the zone of flow establishment. Equations for decay of velocity, density, and turbulent quantities are given from the non-buoyant region to the plume region for both plane and round buoyant jets.

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