CFD Investigation of Room Ventilation for Improved Operation of a Downdraft Table: Novel Concepts

CFD Investigation of Room Ventilation for Improved Operation of a Downdraft Table: Novel Concepts

TitleCFD Investigation of Room Ventilation for Improved Operation of a Downdraft Table: Novel Concepts
Publication TypeJournal Article
Year of Publication2006
AuthorsBuvaneswari Jayaraman, Astrid H Kristoffersen, Elizabeth U Finlayson, Ashok J Gadgil
JournalJournal of Occupational and Environmental Hygiene
Volume3
Chapter
Pagination583-591
Keywordsairflow and pollutant transport group, cfd modeling, contamination control, downdraft table, indoor airflow and pollutant transport, indoor environment department, ventilation
Abstract

We report a computational fluid dynamics (CFD) study of containment of airborne hazardous materials in a ventilated room containing a downdraft table. Specifically, we investigate the containment of hazardous airborne material obtainable under a range of ventilation configurations. The desirable ventilation configuration should ensure excellent containment of the hazardous material released from the workspace above the downdraft table. However, increased airflow raises operation costs, so the airflow should be as low as feasible without compromising containment. The airflow is modeled using Reynolds Averaged Navier Stokes equations with a high Reynolds number k-epsilon turbulence model. CFD predictions are examined for several ventilation configurations. Based on this study, we find that substantial improvements in containment are possible concurrent with reduction in airflow, compared to the existing design of ventilation configuration.