An Experimental Study on the Dynamic Ice Accretion Processes on Bridge Cable Models with Different Surface Modifications
To be published on June 10, 2019 by SAE International in United States
An experimental study was conducted to investigate the dynamic ice accretion processes on bridge cable models with different surface modifications (i.e., Standard plain, Pattern-indented surface, and helical fillets). The icing experiments were performed in the unique Icing Research Tunnel available at Iowa State University (i.e., ISU-IRT). In order to reveal the transient ice accretion processes and the associated aerodynamic loadings on the test models under different icing conditions (i.e., rime vs. glaze), while a high-speed imaging system was used to capture the transient features of the surface water runback and ice accretion over the surface of the cable models, a high-accuracy dual-transducer force measurement system was also utilized to measure the dynamic aerodynamic loadings acting on the ice accreting cable models. It was found that, the addition of surface features (i.e., pattern-indented surface vs. helical fillets) could effectively influence the dynamic ice accretion process and the final ice structures. Based on the temporally-resolved measurements of the aerodynamic drag forces acting on the different cable models, it was found that, while the ice accretion on the standard plain cable and the cable with helical fillets could essentially reduce the drag forces acting on the cable models, the ice formation on the pattern-indented cable would induce larger aerodynamic drag forces. The findings derived from this study is of great importance in elucidating the underlying icing physics on bridge cables for the development of innovative, effective anti-/de-icing strategies tailored for bridge icing mitigation and protection in cold climates.