Turbulence modulation in a simplex spray

Wei-Hsiang Lai, M. R. Wang, D. Y. Huang

Research output: Contribution to journalArticle

Abstract

Measurements of the turbulence modulation terms, i.e., u′giu′pl, between the gas and dispersed phase issued from a Simplex atomizer were carried out by a phase Doppler particle analyzer (PDPA) system. The Simplex atomizer is fueled by methanol with flow rate and pressure controlled at 1.39 g/s and 433 kPa, respectively. Results of the turbulence modulation for drop size less than 30 μm are presented. The turbulence modulation terms of Simplex spray is related to slip velocity, velocity fluctuations of both gas phase and dispersed phase, Reynolds stress of the gas phase and velocity correlation (u′pv′p) of the dispersed phase. The distributions of turbulence modulation terms in both axial and radial directions are similar. It is found that the turbulence modulation terms are higher in the spray sheet (i.e., R = 27-33 mm) for each size-class drops which increase from 0.8 m2/sec2 for 10 μm drops to 8.2 m2/sec2 for 30 μm drops, indicating the higher turbulence production of the gas phase due to the existence of larger drops. There are also turbulence modulations at radial position R = 10-20 mm which show the similar trend as Reynolds stress distribution at the same position. The Reynolds stress of gas phase and velocity correlation of dispersed phase are highly related to the turbulence modulation.

Original languageEnglish
Pages (from-to)97-107
Number of pages11
JournalInternational Journal of Fluid Mechanics Research
Volume24
Issue number1-3
DOIs
Publication statusPublished - 1997 Jan 1

Fingerprint

sprayers
Turbulence
turbulence
Modulation
modulation
vapor phases
Reynolds stress
atomizers
Gases
Atomizers
drop size
stress distribution
Stress concentration
analyzers
Methanol
slip
methyl alcohol
flow velocity
Flow rate
trends

All Science Journal Classification (ASJC) codes

  • Mechanical Engineering
  • Physics and Astronomy(all)

Cite this

Lai, Wei-Hsiang ; Wang, M. R. ; Huang, D. Y. / Turbulence modulation in a simplex spray. In: International Journal of Fluid Mechanics Research. 1997 ; Vol. 24, No. 1-3. pp. 97-107.
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Turbulence modulation in a simplex spray. / Lai, Wei-Hsiang; Wang, M. R.; Huang, D. Y.

In: International Journal of Fluid Mechanics Research, Vol. 24, No. 1-3, 01.01.1997, p. 97-107.

Research output: Contribution to journalArticle

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