Turbulence modulation investigation by a monodispersed droplet stream and electrohydrodynamic method

Wei Fu Lu, Wei Hsiang Lai, Keh Chin Chang

Research output: Contribution to conferencePaperpeer-review

3 Citations (Scopus)

Abstract

This research study turbulence modulation by combining the techniques of the monodispersed spray and electric charging to control dispersed phase of two-phase flows. A monodispersed droplet generator can produce a series of uniform size diameter droplet, and electrohydrodynamics (EHD) method assist these droplets to distribute evenly in a vertical pipe flow. A Particle Dynamics Analyzer (PDA) will be used to measure velocity, fluctuation and size of particle in the flow filed. The dispersed phase consists of mono-sized droplets; and gas phase consists of fog (seeding) from a humidifier. The monodispersed droplet generator can operate in a wide excitation frequency to control different size diameter of dispersed phase and volume fraction of flow field. Besides this, nozzle orifice and pressure difference can be used to change droplet size and velocity. By using EHD method can cause a similar result to glass spheres as dispersed phase if manipulate appropriately. These droplets can be dispersed but not atomized by charging. The droplets and seeding are both pure water, and therefore avoid difference of refractive index of these two phases. This advantage can simplify experimental apparatus and procedures efficiently if compared with glass spheres and Titanium dioxide in general two-phase flow case. This combination is helpful to apply to turbulence modulation measurement, and hence can assist some mathematic model to build. As measurement result, the authors believe that the asymmetric graph of turbulence modulation of larger droplet to gas phase is believable until now.

Original languageEnglish
Publication statusPublished - 2006
Event10th International Conference on Liquid Atomization and Spray Systems, ICLASS 2006 - Kyoto, Japan
Duration: 2006 Aug 272006 Sept 1

Other

Other10th International Conference on Liquid Atomization and Spray Systems, ICLASS 2006
Country/TerritoryJapan
CityKyoto
Period06-08-2706-09-01

All Science Journal Classification (ASJC) codes

  • Surfaces, Coatings and Films

Fingerprint

Dive into the research topics of 'Turbulence modulation investigation by a monodispersed droplet stream and electrohydrodynamic method'. Together they form a unique fingerprint.

Cite this