Turbulence modulation measurements in a charged monodispersed droplet stream

Wei Fu Lu, Wei-Hsiang Lai, Keh-Chin Chang, Tung Hsiao Tsai

Research output: Contribution to journalArticle

Abstract

As reported in the study of Chang et al. (2003), the modulation of the carrierphase turbulence, that is, the effect of the presence of dispersed phase on the turbulence structure, is heavily dependent on the term of (u′giu′pi - 2k). Nevertheless, very little experimental data on u′giu′pi can be found in the literature. In this study, a monodispersed droplet stream, instead of poly dispersed spray, is generated using a monosized atomizer. However, the occurrence of breakup or coalescence due to droplet collisions in the stream downgrades the uniformity of droplet size in the downstream. To avoid this, the ele ctrohydr odynamic (EHD) technique is used. Monodispersed droplets can be made toward a rigid body after charging the electrons. When charged droplets move closer, the coulomb force will keep the droplets distant from one another and avoid the occurrence of droplet breakup or coalescence. Measurements of droplets' velocity and size in a turbulent stream are made using a particle dynamic analyzer (PDA). Quantities of u′giu′pi and k can be computed using the measured velocities of both carrier and dispersed phases.

Original languageEnglish
Pages (from-to)158-168
Number of pages11
JournalChemical Engineering Communications
Volume197
Issue number2
DOIs
Publication statusPublished - 2010 Jan 1

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Turbulence
Modulation
Coalescence
Atomizers
Electrohydrodynamics
Electrons

All Science Journal Classification (ASJC) codes

  • Chemistry(all)
  • Chemical Engineering(all)

Cite this

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Turbulence modulation measurements in a charged monodispersed droplet stream. / Lu, Wei Fu; Lai, Wei-Hsiang; Chang, Keh-Chin; Tsai, Tung Hsiao.

In: Chemical Engineering Communications, Vol. 197, No. 2, 01.01.2010, p. 158-168.

Research output: Contribution to journalArticle

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