11/11/2023 0 Comments Direct airflow technology![]() In the current state of the art, forced airflow is predominantly generated by mechanical devices with spinning blades. 1 IntroductionĪirflow generation is everywhere, with applications ranging from large-scale jet propulsion engines to domestic hand-held hairdryers. EHD air amplification yields up to 3x the airflow rate as regular EHD.Energy efficiency increase of 66% compared to regular EHD.Experimental proof-of-concept of EHD air amplification.It lays the groundwork for further optimization studies to position EHD air amplification as a low-energy, low-maintenance, motor- and noiseless airflow generation technology. The proposed EHD air amplifier operates at atmospheric pressure. The flow rate to electric power ratio increased to 66% in EHD air amplification compared to regular EHD. Compared to regular EHD, we achieved a higher aerodynamic performance for the same electric energy invested. Maximum airflow rates of about 15 m 3 h −1 were obtained shortly before electric breakdown at 22 kV. After a voltage threshold of 14 kV, amplified airstreams up to an amplification factor of 3 were measured. We show the proof-of-concept for an EHD air amplification system. Lastly, the converged nozzle airflow was used to create a bleed flow on a plate to facilitate air amplification of the surrounding air. ![]() The impact of a converging nozzle on the EHD-generated airflow was subsequently studied. Then, a dielectric material was added to determine its influence on the electric field. First, regular EHD flow was studied in a 150 × 150 × 500 mm 3 channel. Due to the complex interactions between EHD and dielectric structures for air amplification, the conceptual EHD air amplifier device is designed stage-wise, starting with a simple emitter-collector electrode configuration. The concept uses ionic wind as bleed flow to induce a more significant bulk flow by the air-amplifying Coanda effect. To increase EHD-generated flow rates, this study experimentally investigates a novel concept called EHD air amplification. While the ionization process is energy-efficient, reaching competitive flow rates remains challenging from a high-voltage engineering perspective. The air ionizes between electrodes via corona discharge and accelerates in an electric field, exchanging momentum with the surrounding air. EHD airflow, or ionic wind, arises when a high voltage gradient is applied to a set of electrodes. With electrohydrodynamics (EHD), we can propel air in a low-energy fashion. 3Swiss Federal Institute of Technology, ETH-Zurich, Zurich, Switzerland.2BIOSYST-MeBioS, KU Leuven, Heverlee, Belgium.1Empa, Swiss Federal Laboratories for Materials Science and Technology, Laboratory for Biomimetic Membranes and Textiles, Dübendorf, Switzerland.Donato Rubinetti 1,2 Kamran Iranshahi 1,3 Daniel Onwude 1 Bart Nicolaï 2 Lei Xie 4 Thijs Defraeye 1*
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