Characterization of a system generating a homogeneous isotropic turbulence field by free synthetic jets
- 418 Downloads
A facility inspired by Hwang and Eaton (2004a, b) for generating a homogeneous isotropic turbulence was built, the objective being to study evaporating droplets in the presence of turbulence. Turbulence was produced by the mixing of six synthetic jets, in ambient atmosphere. Combined PIV and LDA techniques were used to measure the statistical turbulence properties. The turbulence produced was found to be homogeneous isotropic with a small mean flow within a domain having an average size of 50 mm × 50 mm × 50 mm. The rms fluctuations were of the order of 0.9 m/s, corresponding to a Taylor Reynolds number of 240 and an integral length scale of about 40 mm. This apparatus proved to be well suited to the study of the evaporation of droplets in a controlled turbulence field.
The authors acknowledge the CNRS (Centre National de la Recherche Scientifique) and the French Ministry of Research and Technology (for their financial support. They express their gratitude to M. Massot (Laboratoire EM2C, ECP, UPR CNRS 288) for his scientific collaboration. They also acknowledge N. Grosjean and E. Jondeau for their efficient technical assistance in the handling of measuring techniques.
- George WK Jr (1978) Processing of random signals. Proceedings of the dynamic flow conference, Tonsbakken, Denmark, pp 20–63Google Scholar
- Hwang W, Eaton JK (2001) A new facility for study of attenuation of homogeneous isotropic gas turbulence by solid particles. 4th International conference on multiphase flow. New-Orleans. CD-rom, paper 125Google Scholar
- Hwang W, Eaton JK (2004b) Modification of homogeneous and isotropic turbulence by solid particles. Tech Rep TF-90. Stanford UniversityGoogle Scholar
- Kolmogorov AN (1941) The local structure of turbulence in an incompressible viscous fluid for very large Reynolds numbers. Dokl Akad Nauk SSSR 30:299–303Google Scholar
- Tennekes H, Lumley JL (1974) A first course in turbulence. MIT Press, Cambridge (Third printing)Google Scholar