TY - GEN
T1 - The combined effects of rib arrangemets and discrete ribs on local heat/mass transfer in a square duct
AU - Cho, H. H.
AU - Lee, S. Y.
AU - Wu, S. J.
PY - 2001
Y1 - 2001
N2 - Local heat/mass transfer and friction loss in a square duct roughened with various types of continuous and discrete rib tabulators are investigated. The combined effects of the gap flows of the discrete ribs and the secondary flows are examined for the purpose of the reduction of thermally weak regions and the promotion of the uniformity of heat/mass transfer distributions as well as the augmentation of average heat/mass transfer. The rib-to-rib pitch to the rib height ratio (p/e) of 8 and the rib angles of 90 and 60 deg are selected with e/Dh,=0.08. The vortical structure of the secondary flows induced by the parallel angled arrays are quite distinct from that induced by the cross angled arrays. This distinction influences on heat/mass transfer and friction loss in all the tested cases. The gap flows of the discrete ribs reduce the strength of the secondary flows but promote local turbulence and flow mixing. As a result, the fairly uniform heat/mass transfer distributions are obtained with two row gaps.
AB - Local heat/mass transfer and friction loss in a square duct roughened with various types of continuous and discrete rib tabulators are investigated. The combined effects of the gap flows of the discrete ribs and the secondary flows are examined for the purpose of the reduction of thermally weak regions and the promotion of the uniformity of heat/mass transfer distributions as well as the augmentation of average heat/mass transfer. The rib-to-rib pitch to the rib height ratio (p/e) of 8 and the rib angles of 90 and 60 deg are selected with e/Dh,=0.08. The vortical structure of the secondary flows induced by the parallel angled arrays are quite distinct from that induced by the cross angled arrays. This distinction influences on heat/mass transfer and friction loss in all the tested cases. The gap flows of the discrete ribs reduce the strength of the secondary flows but promote local turbulence and flow mixing. As a result, the fairly uniform heat/mass transfer distributions are obtained with two row gaps.
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U2 - 10.1115/2001-GT-0175
DO - 10.1115/2001-GT-0175
M3 - Conference contribution
AN - SCOPUS:84905717880
SN - 9780791878521
T3 - Proceedings of the ASME Turbo Expo
BT - Heat Transfer; Electric Power; Industrial and Cogeneration
PB - American Society of Mechanical Engineers (ASME)
T2 - ASME Turbo Expo 2001: Power for Land, Sea, and Air, GT 2001
Y2 - 4 June 2001 through 7 June 2001
ER -