- Author
-
Thomas, P. H.
- Title
- Smoke Flow in Buildings: Entrainment Around the Corner (Hydraulic Model).
- Coporate
- Lund Univ., Sweden
- Sponsor
- Swedish Fire Research Board, Stockholm, Sweden
- Report
-
LUTVDG/TVBB-3067-SE
June 1992
21 p.
- Keywords
-
smoke
|
entrainment
|
corners
|
plumes
- Abstract
- In an engineering treatment of the rotation of a layer of hot gas emerging under a balcony Morgan and Marshall introduced the concept of a horizontal Equivalent Gaussian Source for the resulting vertical plume. They found it necessary to suppose that in the rotation the entrainment was more than 5 times the amount to be expected using conventional entrainment coefficients for vertical plumes. In this report two versions of an alternative model are given and it is suggested that the apparently high entrainment is due to the way equivalence is defined, i.e., it is in part real in part fictitious and in part an effect of temperature in the Morgan and Marshall model.