Heat transfer and friction behaviors in rectangular channels with varying number of ribbed walls

Convective heat transfer enhancement in solar air channels

“…Chandra et al [35] conducted experiments for a turbulent square channel flow with transverse ribs on one, two, three, and all four surfaces for Re values ranging from 10,000 to 80,000, with a pitch-to-rib height ratio of 8.0 and rib-height-to-duct hydraulic diameter ratio of 0.06255.…”

Effect of rib spacing on heat transfer and friction in a rotating two-pass square channel with asymmetrical 90-deg rib turbulators

“…Han and Zhang (1992) [10], Ekkad and Han (1996) [11] presented more detailed heat transfer distributions in a square channel with 90-deg ribs, 60-deg parallel or V ribs. On the other hand, Chandra et al (1997Chandra et al ( , 2003 [12,13], Rau et al (1998) [14], and Ahn et al (2008) [15] focused the number of ribbed walls (one to four) on heat transfer. They found that both the heat transfer coefficient and the friction factor increase with an increasing number of ribbed walls, but the relative increase in heat transfer is lower than the increase in friction factor.…”

Materials Property Profiles for Actively Cooled Panels: An Illustration for Scramjet Applications

“…The conflicting requirements of points (a) through (c) result in the optimum. It is also possible to enhance the coolant heat transfer by modulating the duct internal surfaces, [11,12] but because this option is not considered, the code remains conservative.…”