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DTIC ADA190606: Dense-Spray Structure and Phenomena. Part 1. Turbul... |
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by Defense Technical Information Center |
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This report describes one aspect of an investigation of |
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dense-spray processes: namely turbulence/dispersed-phase |
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interactions. The work was divided into two phases: (1) |
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measurements of particle-laden jets injected into a still |
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liquid; and homogenous particle flows, consisting of |
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particles falling in a still (in the mean) liquid bath. |
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The structure of turbulent, dilute, particle-laden water |
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jets, submerged in still water, was studied both |
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experimentally and theoretically. Nonintrusive |
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measurements were made of mean and fluctuating phase |
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velocities and particle number fluxes. Analysis was used |
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to help interpret the measurements, considering three |
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limiting cases, as follows: (1) locally-homogenous flow, |
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where relative velocities between the phases are ignored; |
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(2) deterministic separated flow, where relative |
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velocities are considered, but particle/turbulence |
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interactions are ignored; and (3) stochastic separated |
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flow, where both phenomena are considered using random- |
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walk methods. The locally-homogenous flow approximation |
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was more effective than for past work involving larger |
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density ratios between the phases; nevertheless, |
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stochastic analysis yielded best agreement with |
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measurements. Effects of enhanced drag (due to high |
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relative turbulent intensities of particle motion) and |
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effects of particles on liquid turbulence properties |
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(turbulence modulation), were observed. Several recent |
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proposals for treating these phenomena were examined; |
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however, none appears to be adequate for reliable general |
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use. |
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Date Published: 2018-02-17 11:33:12 |
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Identifier: DTIC_ADA190606 |
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Item Size: 51126663 |
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Language: english |
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Media Type: texts |
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# Topics |
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DTIC Archive; Parthasarathy, R N ; M... |
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