Mo. Hamdan et al., Enhancing forced convection by inserting porous substrate in the core of aparallel-plate channel, INT J N M H, 10(5-6), 2000, pp. 502-517
Citations number
27
Categorie Soggetti
Mechanical Engineering
Journal title
INTERNATIONAL JOURNAL OF NUMERICAL METHODS FOR HEAT & FLUID FLOW
Investigates numerically the mechanism of enhancing heat transfer by using
porous substrate. The numerical investigation is carried out for transient
forced convection in the developing region of a parallel-plate channel part
ially filled with a porous medium. A porous substrate is inserted in the ch
annel core in order to reduce the boundary layer thickness and hence, enhan
ce heat transfer Darcy-Brinkman-Forchheimer model is used to simulate the p
hysical problem. Results of the current model show that the existence of th
e porous substrate may improve the Nusselt number at the fully developed re
gion by a factor of four and even higher depending an the value of Darcy nu
mber. If is found that the maximum Nusselt number is achieved at an optimum
thickness. Also, the study shows that partially filled channels have bette
r thermal performance than the totally filled ones. However, there is an op
timum thickness of porous substrate, beyond it the Nusselt number starts to
decline.