ISSN Online: 2377-424X
ISBN Print: 0-89116-299-2
International Heat Transfer Conference 7
HEAT AND MASS TRANSFER DOWNSTREAM OF SUDDEN, NON-AXISYMMETRIC ENLARGEMENTS IN A DUCT
Resumo
This paper presents mass and heat transfer rates downstream of sudden expansions produced by circular pipes issuing into ducts of square cross-section. An electrochemical technique was employed to determine the axial distributions of the cross-stream, planar-averaged transfer coefficients. In all cases, a well-defined peak
was observed and these maxima were found to be up
to 17 times greater than the values associated
with fully-developed flow in a square duct. The
peak mass transfer data were correlated by means
of a simple power-law dependence on the Reynolds
number and the expansion ratio. Data are presented for area expansion ratios of 5,11,20 and 45 and the Reynolds number in the outlet square duct was varied from 2,000 to 20,000.