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Title: Temporal and spatial unmixedness downstream of a plate array

Abstract

The effect of a plate array on a turbulent velocity and turbulent concentration field is determined. Profiles of mean and root-mean-square velocity and concentration, profiles of temporal and spatial unmixedness, and profiles of the variance of the gradient of velocity and the variance of the gradient of concentration are presented. Velocity and concentration integral length scales are compared. A biplane injection grid is used to produce the turbulent concentration and turbulent velocity field. Helium is injected through the jets at the grid nodes as air passes through the grid. The time-resolved velocity and concentration data are obtained using a two-sensor probe that consists of a hot wire and a TSI 1440-20 aspirating concentration probe. The addition of a plate array is shown to decrease the spatial unmixedness to a nearly zero value in about half the downstream distance observed without plates. Further, an increase in dissipation is shown with the array in place that reduces the temporal unmixedness to a value less than the value observed without the plates in about one-third the downstream distance. (c) 2000 American Institute of Physics.

Authors:
 [1];  [2]
  1. Department of Mechanical Engineering, California State University, Los Angeles, Los Angeles, California 90032 (United States)
  2. Department of Mechanical and Aerospace Engineering, University of California, Irvine, Irvine, California 92697 (United States)
Publication Date:
OSTI Identifier:
20216384
Resource Type:
Journal Article
Journal Name:
Physics of Fluids (1994)
Additional Journal Information:
Journal Volume: 12; Journal Issue: 6; Other Information: PBD: Jun 2000; Journal ID: ISSN 1070-6631
Country of Publication:
United States
Language:
English
Subject:
71 CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS; PLATES; TURBULENCE; TURBULENT FLOW; VELOCITY; FLOW VISUALIZATION; THEORETICAL DATA

Citation Formats

Guillaume, D. W., and LaRue, J. C. Temporal and spatial unmixedness downstream of a plate array. United States: N. p., 2000. Web. doi:10.1063/1.870398.
Guillaume, D. W., & LaRue, J. C. Temporal and spatial unmixedness downstream of a plate array. United States. doi:10.1063/1.870398.
Guillaume, D. W., and LaRue, J. C. Thu . "Temporal and spatial unmixedness downstream of a plate array". United States. doi:10.1063/1.870398.
@article{osti_20216384,
title = {Temporal and spatial unmixedness downstream of a plate array},
author = {Guillaume, D. W. and LaRue, J. C.},
abstractNote = {The effect of a plate array on a turbulent velocity and turbulent concentration field is determined. Profiles of mean and root-mean-square velocity and concentration, profiles of temporal and spatial unmixedness, and profiles of the variance of the gradient of velocity and the variance of the gradient of concentration are presented. Velocity and concentration integral length scales are compared. A biplane injection grid is used to produce the turbulent concentration and turbulent velocity field. Helium is injected through the jets at the grid nodes as air passes through the grid. The time-resolved velocity and concentration data are obtained using a two-sensor probe that consists of a hot wire and a TSI 1440-20 aspirating concentration probe. The addition of a plate array is shown to decrease the spatial unmixedness to a nearly zero value in about half the downstream distance observed without plates. Further, an increase in dissipation is shown with the array in place that reduces the temporal unmixedness to a value less than the value observed without the plates in about one-third the downstream distance. (c) 2000 American Institute of Physics.},
doi = {10.1063/1.870398},
journal = {Physics of Fluids (1994)},
issn = {1070-6631},
number = 6,
volume = 12,
place = {United States},
year = {2000},
month = {6}
}