- Author
- Goldman, D. | Jaluria, Y.
- Title
- Effect of Opposing Buoyancy on the Flow in Free and Wall Jets.
- Coporate
- Rutgers Univ., New Brunswick, NJ
- Journal
- Journal of Fluid Mechanics, Vol. 166, 41-56, 1986
- Sponsor
- National Bureau of Standards, Gaithersburg, MD
- Contract
- NBS-GRANT-NB83NADA4047
- Book or Conf
- American Society of Mechanical Engineers. 1985 Winter Annual Meeting in the session on Mixed Convection. November 17-22, 1986. and Preprinted in "Mixed Convection". ASME Heat Transfer Division (HTD) Vol. 53, 1985, American Society of Mechanical Engineers, New York, Miami, FL, Armaly, B. F.; Yao, L. S., Editors, 51-61 p., 1985
- Keywords
- buoyant flow
- Abstract
- An experimental investigation of the nature of the velocity and thermal fields in the mixed convection circumstance of negatively buoyant free and wall jet flows is carried out. The flow configuration considered is that of a negatively buoyant two-dimensional jet discharged adjacent to a vertical surface, as well as that discharged away from the boundaries of the region. Such mixed convection flows are frequently encountered in heat rejection processes and in enclosure fires, where, at various locations, the buoyancy force is upward while the flow is downward, resulting in a negatively buoyant circumstance. An experimental system is developed to study the downward penetration of such jets in which the buoyancy force opposes the externally induced flow. The penetration distance is measured and related to the inflow conditions, particularly the temperature and velocity at the discharge location. A steady-state circumstance is simulated by allowing the fluid to flow out of the enclosure at the open top. The velocity and temperature distributions are also measured, in order to understand the basic nature of such mixed convection flows. Several other effects, such as the entrainment into the flow, are also considered in this study.