Writing in turbulent air

J. Bominaar, M. Pashtrapanska, T. Elenbaas, N.J. Dam, J.J. Meulen, ter, W. Water, van de

Research output: Contribution to journalArticleAcademicpeer-review

10 Citations (Scopus)
102 Downloads (Pure)

Abstract

We describe a scheme of molecular tagging velocimetry in air in which nitric oxide (NO) molecules are created out of O2 and N2 molecules in the focus of a strong laser beam. The NO molecules are visualized a while later by laser-induced fluorescence. The precision of the molecular tagging velocimetry of gas flows is affected by the gradual blurring of the written patterns through molecular diffusion. In the case of turbulent flows, molecular diffusion poses a fundamental limit on the resolution of the smallest scales in the flow. We study the diffusion of written patterns in detail for our tagging scheme which, at short (µs) delay times is slightly anomalous due to local heating by absorption of laser radiation. We show that our experiments agree with a simple convection-diffusion model that allows us to estimate the temperature rise upon writing. Molecular tagging can be a highly nonlinear process, which affects the art of writing. We find that our tagging scheme is (only) quadratic in the intensity of the writing laser.
Original languageEnglish
Article number046312
Pages (from-to)046312-1/12
Number of pages12
JournalPhysical Review E - Statistical, Nonlinear, and Soft Matter Physics
Volume77
Issue number4
DOIs
Publication statusPublished - 2008

Fingerprint Dive into the research topics of 'Writing in turbulent air'. Together they form a unique fingerprint.

Cite this