If you are experiencing problems downloading PDF or HTML fulltext, our helpdesk recommend clearing your browser cache and trying again. If you need help in clearing your cache, please click here . Still need help? Email help@ingentaconnect.com

A PHYSICALLY-BASED MODEL FOR COMPUTING NATURAL VENTILATION RATE IN SANITARY SEWER ATMOSPHERE

$17.50 plus tax (Refund Policy)

Buy Article:

Abstract:

Air flow rate in the headspace of wastewater collection conduit is recognized as a primary input for either equilibrium-or kinetic-based mass transfer modeling. Calculation of the air flow rate also allows the estimation of the volume of air capable of being forced out through openings such as manholes which in turn allows the determination of the size and cost of odorous air treatment alternatives. However, sewer ventilation models currently employed in the emission estimates are noted to overestimate the air flow rate due to the incorrect representation of the driving forces and inappropriate formulation of the physics of the flow phenomena. In this paper, the natural driving forces of wind speed, barometric pressure and wastewater drag are considered. Generalized curves and formulae for computing the air flow rate based on the results of computational fluid dynamics (CFD) modeling are presented. The governing equations are those of the momentum and continuity equations. Turbulence closure is achieved with the use of a generalized eddy viscosity mixing length model and semi-empirical relations. The effects of wind speed and barometric pressure are modeled as dynamic pressure gradient whereas that of wastewater is treated as a Dirichlet boundary condition. The resulting formulations are numerically integrated in a finite element framework.

Document Type: Research Article

DOI: http://dx.doi.org/10.2175/193864704784327287

Publication date: January 1, 2004

More about this publication?
  • Proceedings of the Water Environment Federation is an archive of papers published in the proceedings of the annual Water Environment Federation® Technical Exhibition and Conference (WEFTEC® ) and specialty conferences held since the year 2000. These proceedings are not peer reviewed.

    WEF Members: Sign in (right panel) with your IngentaConnect user name and password to receive complimentary access.
  • Subscribe to this Title
  • Membership Information
  • About WEF Proceedings
  • WEFTEC Conference Information
  • ingentaconnect is not responsible for the content or availability of external websites

Tools

Favourites

Share Content

Access Key

Free Content
Free content
New Content
New content
Open Access Content
Open access content
Subscribed Content
Subscribed content
Free Trial Content
Free trial content
Cookie Policy
X
Cookie Policy
ingentaconnect website makes use of cookies so as to keep track of data that you have filled in. I am Happy with this Find out more