Influence of duct aspect ratio on heat/mass transfer in coolant passages with rotation

Augmented heat transfer with intersecting rib in rectangular channels having different aspect ratios

“…The fluid flow and heat transfer characteristics of an internal passage are dependent not only on the configuration of rib turbulators, but also on the aspect ratio of the channel. There has been extensive research on the heat transfer performance of rib-roughened channels with various aspect ratios [11][12][13].…”

Thermal performance of rotating two-pass ribbed square channel with wavy sidewalls

“…In general, the Coriolis force effects induce the sectional vortices with the turbulence production to be respectively promoted and suppressed over the unstable and stable walls [23]. Such isolated Coriolis force effects generate the peripheral heat transfer decays from the unstable toward the stable walls and are reconfirmed by the heat transfer data converted from the mass transfer test results [24] with diminished buoyancy interaction. Acting by the Coriolis force effects in isolation by increasing Ro, the heat transfer rates over the unstable wall keep increasing from the stationary channel levels; whereas the stable counterparts are initially reduced from the stationary references but followed by the subsequent heat transfer recoveries after Ro exceeding the critical values [1][2][3][4][5][6][8][9][11][12][15][16][17][18][19][20][21][22].…”

Effect of rib height on heat transfer in a two pass rectangular channel (AR=1:4) with a sharp entrance at high rotation numbers

“…Kim et al [19] explained that by increasing the ratio, flow is accelerated over the ribs, producing higher heat transfer levels. In that study, the blockage ratio was changed by decreasing the channel height H. The channel hydraulic diameter D h was kept constant.…”