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Droplet trajectories and icing-collision efficiencies for cylinders determined using LDV
AbstractPresented herein are the results of laboratory measurements on droplet trajectories around ice accretions formed on collector cylinders. The measurements, performed using an icing windtunnel at the Iowa Institute of Hydraulic Research (IIHR), were aimed at evaluating droplet-collision efficiencies associated with the formation of dry-rime icing. Two-component laser-Doppler velocimetry (LDV) was used to make the droplet-trajectory measurements, which required experimentation with both a refrigerated and a non-refrigerated laboratory. Icings were formed in a refrigerated laboratory. A series of non-frigid icing forms then were replicated to enable measurements in a non-refrigerated laboratory. Flow visualization, performed using a smoke-wire method, enabled comparison of droplet trajectories and flow-field evolution around the icing forms.The results show that the formulations of collision efficiency, E, based on potential flow theory over-estimate E compared with E values obtained from the LDV measurements of this study. The differences are attributable mainly to the assumption of potential-flow around a cylinder.
Droplet trajectories and icing-collision efficiencies for cylinders determined using LDV
AbstractPresented herein are the results of laboratory measurements on droplet trajectories around ice accretions formed on collector cylinders. The measurements, performed using an icing windtunnel at the Iowa Institute of Hydraulic Research (IIHR), were aimed at evaluating droplet-collision efficiencies associated with the formation of dry-rime icing. Two-component laser-Doppler velocimetry (LDV) was used to make the droplet-trajectory measurements, which required experimentation with both a refrigerated and a non-refrigerated laboratory. Icings were formed in a refrigerated laboratory. A series of non-frigid icing forms then were replicated to enable measurements in a non-refrigerated laboratory. Flow visualization, performed using a smoke-wire method, enabled comparison of droplet trajectories and flow-field evolution around the icing forms.The results show that the formulations of collision efficiency, E, based on potential flow theory over-estimate E compared with E values obtained from the LDV measurements of this study. The differences are attributable mainly to the assumption of potential-flow around a cylinder.
Droplet trajectories and icing-collision efficiencies for cylinders determined using LDV
Yoon, B. (author) / Ettema, R. (author)
Cold Regions, Science and Technology ; 21 ; 381-397
1992-12-08
17 pages
Article (Journal)
Electronic Resource
English
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