Library Subscription: Guest

ISSN Online: 2379-1748

7th Thermal and Fluids Engineering Conference (TFEC)
SJR: 0.152 SNIP: 0.14 CiteScore™:: 0.5

Indexed in

Clarivate CPCI (Proceedings) Scopus
May, 15-18, 2022 , Las Vegas, NV, USA

FLOW INDUCED BY A TWO STAGE EHD GAS PUMP WITH UNEVEN APPLIED VOLTAGES

Get access (open in a dialog) pages 467-476
DOI: 10.1615/TFEC2022.emt.040987

Abstract

Previous studies have shown that EHD gas pump is effective for gas pumping. Flow induced by a two stage EHD (electrohydrodynamic) gas pump with uneven applied voltages has been experimentally examined to achieve the desired results. The gas pump with 12 emitting electrodes in each stage is evaluated for a combination of three different operating voltages (20 kV, 24 kV, and 28 kV) for further improvement in its performance. To achieve the maximum enhancement in gas pumping, the emitting electrodes are flush mounted on the channel walls so that the induced flow produced directly disturbs the boundary layer thickness and improves the heat transfer. This is leading to a higher velocity near the channel walls and resulting in an inverted parabolic velocity profile at the center of the channel, which is opposite to the fully developed velocity profile of a forced flow. Velocities are measured at three cross-sections along the tube length and then integrated to obtain the volume flow rate. In addition to the volume flow rate produced, the performance of the pump is evaluated using an energy efficiency factor, which is defined as the volume flow rate delivered by a unit power input. These results reveal that EHD gas pump has a great potential for many engineering applications and can be more energy efficient when operated with uneven applied voltages.