Simultaneous measurements of instantaneous concentrations of two species being mixed in a turbulent flow by using a combined laser-induced fluorescence and laser-scattering technique

Komori, Satoru; Kanzaki, Takao; Murakámi, Yasuhiro; Ueda, Hisahiro

doi:10.1063/1.857454

Cited by 25 publications

(31 citation statements)

References 8 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…On the other hand, the results of the LES based on the primitive models overpredict the mean concentration of product P for both moderately fast and rapid reaction cases, as shown in Figure 17b. Symbols denote the measurements by Komori et al (1993b) and the lines are the results of the LES: E, -, ͗u 2 ͘; Ⅺ, ---, ͗v 2 ͘. The results mentioned above suggest that the LES with the present SGS models is very useful for predicting various concentration statistics of a turbulent reacting liquid flow.…”

Section: Large-eddy Simulation Of a Mixing Layer Liquid Flow Downstrementioning

confidence: 69%

Large‐Eddy simulation of a turbulent reacting liquid flow

Michioka

Komori

2004

AIChE Journal

Self Cite

View full text Add to dashboard Cite

A subgrid-scale (SGS) model for the filtered reaction source term is presented to develop the large-eddy simulation (LES) of a nonpremixed, turbulent liquid flow with a moderately fast reaction. The SGS model is based on the SGS probability density function (PDF) and SGS conditional expectation. The SGS probability density function (SGS-PDF) is assumed to follow a beta distribution and a simple algebraic model for the SGS conditional expectation is developed using the filtered data obtained from the direct numerical simulation (DNS) of stationary isotropic liquid turbulence with a second-order chemical reaction. For a rapid reaction, the SGS-PDF model based on the conserved scalar is used as the SGS model. The LES based on these SGS models is applied to a liquid

show abstract

Section: Large-eddy Simulation Of a Mixing Layer Liquid Flow Downstrementioning

confidence: 69%

Large‐Eddy simulation of a turbulent reacting liquid flow

Michioka

Komori

2004

AIChE Journal

Self Cite

View full text Add to dashboard Cite

show abstract

“…The resolutions are 0.3-1.0 mm in the streamwise direction and 0.8-1.3 mm in the vertical and spanwise directions. Judging from the experiments, 7,8 these are within the inertial subrange in an energy spectrum. Therefore, the use of the subgrid model 13,14 is considered to be adequate.…”

Section: Large-eddy Simulationmentioning

confidence: 97%

Application of flamelet model to large‐eddy simulation of turbulent reacting liquid flows

et al. 2011

Self Cite

View full text Add to dashboard Cite

Large-eddy simulations using the flamelet models are applied to turbulent reacting liquid flows and validated by comparing with the experiments. The computations are performed for two reaction conditions, namely a rapid reaction and a moderately fast reaction in a grid-generated turbulent flow. For the flamelet models, both the steady flamelet model and the unsteady Lagrangian flamelet model are tested. A second-order, irreversible, and isothermal reaction is considered. The results show that the flamelet models inherently developed for turbulent combustion are applicable to turbulent reacting liquid flows, provided that the model coefficient in evaluating the subgrid scale variance of mixture fraction in the scale-similarity model is set to be 5.0. The rapid reaction can be adequately predicted by both the steady and unsteady Lagrangian flamelet models, whereas the moderately fast reaction can be predicted only by the unsteady Lagrangian flamelet model which is capable to take slow chemical processes into account. V V C 2010 American Institute of Chemical Engineers AIChE J, 57: 911-917, 2011

show abstract

“…In contradiction to Batchelor's 19 prediction, several experimental studies of high Schmidt number turbulent scalars have not observed the κ −1 scaling behavior. [20][21][22][23] Some observed that a weaker scaling, possibly a lognormal scaling, across the viscous-convective subrange may be more representative of experimental data. 20 Case 5 has a sufficiently high Sc = 256 to allow for a comparison of the scalar spectra produced by the linear scalar and mean gradient forcing methods to both Batchelor's 19 predictions and the summarized experimental results.…”

Section: -15mentioning

confidence: 99%

“…These differences are more pronounced at larger Sc and can be considered in terms of Batchelor's theory for scalar behavior 19 and experimentallyobserved high-Schmidt number scalar behavior. [20][21][22][23] …”

Section: Implications For High-schmidt Number Scalar Mixingmentioning

confidence: 99%

A novel forcing technique to simulate turbulent mixing in a decaying scalar field

2013

View full text Add to dashboard Cite

To realize the full potential of Direct Numerical Simulation in turbulent mixing studies, it is necessary to develop numerical schemes capable of sustaining the flow physics of turbulent scalar quantities. In this work, a new scalar field forcing technique, termed "linear scalar forcing," is presented and evaluated for passive scalars. It is compared to both the well-known mean scalar gradient forcing technique and a low waveshell spectral forcing technique. The proposed forcing is designed to capture the physics of one-time scalar variance injection and the subsequent self-similar turbulent scalar field decay, whereas the mean scalar gradient forcing and low waveshell forcing techniques are representative of continuous scalar variance injection. The linear scalar forcing technique is examined over a range of Schmidt numbers, and the behavior of the proposed scalar forcing is analyzed using single and two-point statistics. The proposed scalar forcing technique is found to be perfectly isotropic, preserving accepted scalar field statistics (fluxes) and distributions (scalar quantity, dissipation rate). Additionally, it is found that the spectra resulting from the three scalar forcing techniques are comparable for unity Schmidt number conditions, but differences manifest at high Schmidt numbers. These disparities are reminiscent of those reported between scaling arguments suggested by theoretical predictions and experimental results for the viscous-convective subrange. C 2013 AIP Publishing LLC. [http://dx

show abstract

Simultaneous measurements of instantaneous concentrations of two species being mixed in a turbulent flow by using a combined laser-induced fluorescence and laser-scattering technique

Cited by 25 publications

References 8 publications

Large‐Eddy simulation of a turbulent reacting liquid flow

Large‐Eddy simulation of a turbulent reacting liquid flow

Application of flamelet model to large‐eddy simulation of turbulent reacting liquid flows

A novel forcing technique to simulate turbulent mixing in a decaying scalar field

Contact Info

Product

Resources

About