Heat transfer on ribbed surfaces

The Local Nusselt numbers of Ribbed surfaces were measured. From the measured data, average Nusselt numbers were evaluated in the sub-regions of ribbed surface, such as front, top and back surfaces of rib, and downstream and upstream regions of base surface. In the present paper were discussed the relationships between the average Nusselt number in each sub-region and Reynolds number, the pitch and height of rib, and heat flux ratio. (author)