The nozzle-fluid concentration field of the round, turbulent, free jet

Abstract

The light-scatter technique has been used to study the nozzle-fluid concentration field in an isothermal, turbulent, axisymmetric air/air free jet with the nozzle air marked by an oil smoke. The data on the mean concentration field appear to be the most accurate yet obtained, due to the peculiar advantages of the technique. The turbulent concentration fluctuations have been characterized as to intensity, spectral distribution, and two-point correlation. The intermittency factor has been measured and the properties of the turbulent fluid computed. Comparison with the results of other investigators who used heat to mark the nozzle fluid indicates a close similarity between the concentration and temperature fields.

Turbulent Buoyant Jet of a Low-Density Gas Leaks into High-Density Ambient: Hydrogen Leakage in Air

“…The normalized cross-stream velocity profiles V/U cl (Eq. (12)) are based on measurements of a hydrogen-air jet by (Schefer et al, 2008b) and an air-air jet by (Becker et al, 1967), which are compared with measurements of an air-air jet by (Panchapakesan & Lumley, 1993), as illustrated in Fig. 2.…”

“…(11) and (13) give the entrainment coefficient α = c m /2 = 0.0515 for the momentum-dominated hydrogen-air jet and α = c m /2 = 0.053 for the air-air jet based on measurements by (Becker et al, 1967). By inserting the time-averaged profiles of U and V, Eq.…”

Assessment of the release of atomic Na from a burning black liquor droplet using quantitative PLIF

“…As described in Section 2, the dilution ratio was estimated assuming a jet, based on the analysis of Becker et al [21]. For this estimate, the diameter of the nozzle was based on that of wire loop, i.e.…”

Effects of Thermal Discharges on the Mass/Energy Balance of Lake Michigan.

“…Tracers such a s dye, smoke, o r heat (with n e g l i g i b l e change i n d e n s i t y ) have been used t o s t u d y mass t r a n s p o r t i n jets [17]. It i s found t h a t t h e s e t r a c e r s spread more r a p i d l y t h a n does,momentum i n t u r b u l e n t j e t s f o r t h e reason given i n S e c t i o n 11-A.…”