Time-resolved, 3D, laser-induced fluorescence measurements of fine-structure passive scalar mixing in a tubular reactor期刊界 All Journals 搜尽天下杂志传播学术成果专业期刊搜索期刊信息化学术搜索

Time-resolved, 3D, laser-induced fluorescence measurements of fine-structure passive scalar mixing in a tubular reactor

Authors:

E. Van Vliet S. M. Van Bergen J. J. Derksen L. M. Portela H. E. A. Van den Akker

Affiliation:

(1) Kramers Laboratorium voor Fysische Technologie, Faculty of Applied Sciences, Delft University of Technology, Prins Bernhardlaan 6, 2628 BW Delft, The Netherlands

Abstract:

A three-dimensional, time-resolved, laser-induced fluorescence (3D-LIF) technique was developed to measure the turbulent (liquid-liquid) mixing of a conserved passive scalar in the wake of an injector inserted perpendicularly into a tubular reactor withRe=4,000. In this technique, a horizontal laser sheet was traversed in its normal direction through the measurement section. Three-dimensional scalar fields were reconstructed from the 2D images captured at consecutive, closely spaced levels by means of a high-speed CCD camera. The ultimate goal of the measurements was to assess the downstream development of the 3D scalar fields (in terms of the full scalar gradient vector field and its associated scalar energy dissipation rate) in an industrial flow with significant advection velocity. As a result of this advection velocity, the measured 3D scalar field is artificially ldquo

skewed

during a scan period. A method to correct for this skewing was developed, tested and applied. Analysis of the results show consistent physical behaviour.List of symbols A Deformation tensor - D_t,D_f Reactor and injector diameter - L_x,L_y,L_z Dimensions of the 3D-LIF measurement volume - N_x,N_y,N_z Number of data samples per measurement volume - Re_m Reynolds number based on mean velocity - Sc Schmidt number - f Focal length - f_c,lens, f_c,array Cut-off frequency for camera lens and sensor array - f,f Marginal probability density function for and - f Joint probability density function of and - $$Delta t $$

Temporal separation of the 2D data planes - $$Delta T $$

Temporal resolution of the measurement volume - $$Delta x,;Delta y,;Delta z $$

Spatial resolution of the measurement volume - , Deformation angle and deformation, where =tan - Fluid energy dissipation rate - , Strain limited vorticity and scalar diffusion layers - Scalar concentration - ,_B Kolmogorov and Batchelor length scale - , Spherical angles of the scalar gradient vector, $$nabla zeta $$

- Kinematic viscosity - _e^–2 Half-thickness (1/e²) of the laser sheet - ,_a Kolmogorov and Kolmogorov advection time scales - Scalar energy dissipation rate - Scalar diffusivity - 2D, 3D Two- and three-dimensional - DNS Direct numerical simulation - LIF Laser-induced fluorescence - SED Scalar energy dissipation rate - TR Tubular reactor

E. Van VlietEmail:

Keywords:

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