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Computer simulation of push-pull systems.

Authors
Flynn-MR
Source
Environmental Sciences and Engineering, School of Public Health, University of North Carolina, Chapel Hill, North Carolina 1993 Dec; :1-70
Link
NIOSHTIC No.
00218695
Abstract
A three dimensional finite element code was developed to estimate jet trajectories for push pull ventilation systems in crossdrafts. A system with a square jet of dilute tracer gas directed toward a square hood with a crossdraft perpendicular to their common centerline axis was modeled. Computer predicted velocity vectors and tracer concentrations were tested by using hot film anemometry, hood capture efficiency measurements, jet trajectory visualization, and measurements of the tracer concentration field. The findings of the study suggested that reasonable three dimensional velocity simulations can be obtained with an upwind finite element code using a penalty function. However, the prediction of turbulence kinetic energy was not good, possibly because of inadequate turbulence modeling or the need for finer grids. The author concludes that the agreement of the jet trajectory with the simulations was excellent, despite limitations in the size of the problem that this algorithm can address.
Keywords
NIOSH-Grant; Control-technology; Ventilation-equipment; Ventilation-hoods; Mathematical-models; Simulation-methods
Contact
Environmental Sciences & Engr University of North Carolina CB 7400 Rosenau Chapel Hill, NC 27599-7400
Publication Date
19931201
Document Type
Final Grant Report
Funding Amount
154156
Funding Type
Grant
Fiscal Year
1994
NTIS Accession No.
PB94-164274
NTIS Price
A05
Identifying No.
Grant-Number-R01-OH-002710
NIOSH Division
OEP
Priority Area
Control-technology
Source Name
Environmental Sciences and Engineering, School of Public Health, University of North Carolina, Chapel Hill, North Carolina
State
NC
Performing Organization
University of North Carolina Chapel Hill, Chapel Hill, North Carolina
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