Passive and reactive scalar measurements in a transient high-Schmidt-number Rayleigh–Taylor mixing layer

Banerjee, Arindam; Mutnuri, L.A.Raghu

doi:10.1007/s00348-012-1328-y

Cited by 6 publications

(8 citation statements)

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“…The influence of ICs on classical RT-unstable flows has received considerable attention in the literature [12,19,[38][39][40][41]. Previous studies [17,42] have identified two alternative phenomenological models that describe the convergence towards self-similarity (Eq.…”

Section: Resultsmentioning

confidence: 99%

Numerical investigation of initial condition effects on Rayleigh-Taylor instability with acceleration reversals

2016

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The influence of initial conditions on miscible incompressible baroclinically driven Rayleigh-Taylor instability undergoing non-uniform acceleration is explored computationally using an Implicit Large Eddy Simulation (ILES) technique. We consider the particular case of evolution during multiple reversals of acceleration direction, where the flow is alternately statically stable or unstable. In the unstable phase, the flow is driven by the baroclinic release of potential energy, whereas in the stable phase, work is done against the density stratification with the energy exchange taking place by wave-like mechanisms. These dynamics are fundamentally different; here, we track the evolution of volume-averaged turbulent statistics that are most sensitive to changes in the distribution of spectral power and bandwidth of the initial conditions as the flow alternates between dynamical regimes due to acceleration reversal.3

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Section: Resultsmentioning

confidence: 99%

Numerical investigation of initial condition effects on Rayleigh-Taylor instability with acceleration reversals

2016

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“…The experiment has also been used for studying RTI unstable interface sitting between stably stratified layers with linear density profiles [80], an RTI in a system of three fluids [81] in which the stratification consists of one stable and one unstable interface. Similar experimental configurations have been developed elsewhere to study passive and reactive scalar measurements in a high Schmidt number ($1000) mixing layer [82] and elastoplastic fluids [83]. Molecular mixing estimates were determined from a passive scalar (Nigrosine) and reactive scalar (Phenolphthalein) measurements; snapshots of the passive scalar measurements are shown in Fig.…”

Section: The Stationary Tankmentioning

confidence: 99%

“…Molecular mixing estimates were determined from a passive scalar (Nigrosine) and reactive scalar (Phenolphthalein) measurements; snapshots of the passive scalar measurements are shown in Fig. 7(d) [82,84].…”

Section: The Stationary Tankmentioning

confidence: 99%

“…Then h ¼ 0 implies no molecular mixing, with the completely molecularly mixed situation indicated by h ¼ 1. Measurements of molecular mixing (plane averaged h) have been performed in stationary tank experiments (SB) [48,82] using salt-water mixed with dye. In the WC experiments, the temperature was used as a fluid-marker, and all parameters listed above were defined using a thermocouple [47,101,104,119].…”

Section: Water Channel Motivated By Shear-flow Experiments Of Brown mentioning

confidence: 99%

“…Molecular mix measurements reported for shear-flows to study a diffusion-limited chemical reaction showed that the degree of molecular mixing was influenced by the Schmidt number. Liquid phase experiments at WC [103] and using an SB setup [78,82] report molecular mixing measurements for a high-Schmidt-number (Sc $ 1000), small-Atwood-number (A t ¼ 7.5 Â 10 À4 ) RT mixing layer. The degree of molecular mixing was measured as a function of Re h by monitoring a diffusion-limited chemical reaction between the two fluids; the pH of each fluid was modified by the addition of acid or alkali.…”

Section: Water Channel Motivated By Shear-flow Experiments Of Brown mentioning

confidence: 99%

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Rayleigh-Taylor Instability: A Status Review of Experimental Designs and Measurement Diagnostics

Banerjee

2020

Journal of Fluids Engineering

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The focus of experiments and the sophistication of diagnostics employed in Rayleigh Taylor Instability (RTI) induced mixing studies have evolved considerably over the past seven decades. The first theoretical analysis by Taylor and experimental results by Lewis on RTI in 1950 examined two-dimensional, single-mode RTI using conventional photographic techniques. Over the next 70 years, several experimental designs have been used to creating an RTI unstable interface between two materials of different densities. These early experiments though innovative, were arduous to diagnose and provided little information on the internal, turbulent structure and initial conditions of the RT mixing layer. Coupled with the availability of high-fidelity diagnostics, the experiments designed and developed in the last three decades allow detailed measurements of various turbulence statistics that have allowed broadly to validate and verify late-time non-linear models and mix-models for buoyancy-driven flows. Besides, they have provided valuable insights to solve several long-standing disagreements in the field. This review serves as an opportunity to discuss the understanding of the RTI problem and highlight valuable insights gained into the RTI driven mixing process through experiments. For the current review, the focus is on low to high Atwood number (> 0.1) experiments.

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Development of Rayleigh Taylor Instability at Various Atwood Numbers—A Review

Boral

Dutta

Kumar

et al. 2022

Recent Advances in Thermofluids and Manufacturing Engineering

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Passive and reactive scalar measurements in a transient high-Schmidt-number Rayleigh–Taylor mixing layer

Cited by 6 publications

References 31 publications

Numerical investigation of initial condition effects on Rayleigh-Taylor instability with acceleration reversals

Numerical investigation of initial condition effects on Rayleigh-Taylor instability with acceleration reversals

Rayleigh-Taylor Instability: A Status Review of Experimental Designs and Measurement Diagnostics

Development of Rayleigh Taylor Instability at Various Atwood Numbers—A Review

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