Droplet Charging Effects in the Space Environment
نویسندگان
چکیده
Several applications exist for transiting liquid droplets through the near-Earth space environment. Numerical results are presented for the charging of liquid droplets of trimethyl pentaphenyl siloxane (DC705) in three different plasma environments: ionosphere, auroral, and geosynchronous Earth orbit (GEO). Nominal and high geomagnetic activity cases are investigated. In general, high levels of droplet charging (>100V) exist only in GEO during periods of high geomagnetic or solar activity. An experiment was conducted to assess the charging of silcon-oil droplets due to photoemission. The photoemission yield in the 120-200nm wavelength range was found to be approximately 0.06.
منابع مشابه
Stratiform cloud electrification: comparison of theory with multiple in-cloud measurements
Stratiform clouds constitute ∼40% of global cloud cover and play a key role in determining the planetary radiation budget. Electrification remains one of the least understood effects on their microphysical processes. Droplet charging at the top and bottom edges of stratiform clouds arises from vertical current flow through clouds driven by the Global atmospheric Electric Circuit. In-cloud charg...
متن کاملExperimental determination of layer cloud edge charging from cosmic ray ionisation
[1] The cloud‐air transition zone at stratiform cloud edges is an electrically active region where droplet charging has been predicted. Cloud edge droplet charging is expected from vertical flow of cosmic ray generated atmospheric ions in the globa l e lec t r i c c i rcu i t . Exper imenta l confirmation of stratiform cloud edge electrification is presented here, through charge and droplet mea...
متن کاملGeometric characterization of optimal electrode designs for improved droplet charging and actuation.
Droplet charging characteristics depending on the geometry of charging electrodes have been investigated experimentally and numerically. In the experiments, two contrasting electrode systems are examined: pin-pin versus planar-planar types. To confirm the different charging behaviours on each electrode, an asymmetric system of a pin-planar type has also been examined. From the experimental and ...
متن کاملA mathematical model for the electric vehicle routing with time windows considering queuing system at charging stations and alternative paths
Due to many damages that human activities have imposed on the environment, authorities, manufacturers, and industry owners have taken into account the development of supply chain more than ever. One of the most influential and essential human activities in the supply chain are transportation which green vehicles such as electric vehicles (EVs) are expected to generate higher economic and enviro...
متن کاملTransient Two-Dimensional (r-z) Cyclic Charging/Discharging Analysis of Space Thermal Energy Storage Systems (RESEARCH NOTE)
A two-dimensional transient axi-symmetric model was developed to study the effects of various thermal and geometric parameters on cyclic heating and cooling modes of a phase-change thermal energy storage system. The high-temperature thermal energy storage device utilizes LiH for heat sink applications to store the waste heat generated during power-burst periods. The stored heat is then discharg...
متن کامل