- Author
-
Abib, A. H.
|
Jaluria, Y.
- Title
- Penetrative Convection in a Partially Open Enclosure.
- Coporate
- Rutgers, State University of New Jersey, New Brunswick
- Sponsor
- National Institute of Standards and Technology, Gaithersburg, MD
- Contract
- NIST-GRANT-60NANB7D0743
- Book or Conf
- American Society of Mechanical Engineers (ASME). Natural Convection in Enclosures. HTD-Vol. 192. 1992,
Am. Soc. of Mechanical Engineers, New York, NY,
73-81 p.,
1992
- Keywords
-
enclosures
|
convection
|
heat sources
|
formulations
|
equations
|
stratification
|
flow fields
|
temperature
|
velocity distribution
|
penetration
|
heat transfer
- Identifiers
- transient behavior; thermal fields; mass outflow rates
- Abstract
- The penetrative convection induced by a localized heat source at the bottom of a partially open enclosure, while the background ambient medium is stably and thermally stratified, is considered. A rectangular cavity with a partially open side is assumed to be adjacent to a long corridor which is stably stratified. The stable thermal stratification that is of interest is a two-layered one or a linear temperature stratification. A control-volume finite-difference method, in stream function and vcorticity formulation, is employed for the solution. The influence of the stratification parameter is examined in the laminar flow regime by considering a range of stratification levels. Heat transfer results, mass outflow rate, penetration distance, velocity and temperature distributions are presented to quantify the penetrative convection. It is found that, for a step ambient temperature profie, the convective motion occurring in the lower unstable layer penetrates significantly into the stable upper layer only for a weak stratification. Small penetration occurs at large stratification levels. The flow field reveals a multi-cellular pattern. Furthermore, it is observed that the penetrative motion occurs in the form of nearly horizontal motion in the lowest part of the stable upper-layer. The thermal field is studied in detail. Other important details on the penetrative transport are brought out.