ISSN Online: 2377-424X
ISBN Print: 0-89116-299-2
International Heat Transfer Conference 7
CROSS FLOW INFLUENCE UPON IMPINGEMENT CONVECTIVE HEAT TRANSFER IN CIRCULAR ARRAYS OF JETS : A GENERAL CORRELATION
摘要
A mathematical formalism is presented to take
account of the cross flow influence upon impingement
heat transfer rates for arrays of circular
jets. A one dimensional flow description yields a
novel dimensionless parameter based upon the length
of the array in the exit cross flow direction. The
overall average Nusselt Number can then be evaluated
as:
Nux = (Nox + Nux) Ψ
where Nox is the Nusselt number in the absence of cross flow, Nux and Ψ being analytical functions of Z/D (impingement distance to jet diameter ratio), m (cross flow to jet momentum ratio), Rex (cross flow Reynolds number based on jet spacing). Accuracy is ± 10% within the range of parameters examined.
Nux = (Nox + Nux) Ψ
where Nox is the Nusselt number in the absence of cross flow, Nux and Ψ being analytical functions of Z/D (impingement distance to jet diameter ratio), m (cross flow to jet momentum ratio), Rex (cross flow Reynolds number based on jet spacing). Accuracy is ± 10% within the range of parameters examined.