Title of Paper:EXPERIMENTAL INVESTIGATION OF FLOW AND HEAT TRANSFER CHARACTERISTICS ON MATRIX RIBBED CHANNEL

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Journal:THERMAL SCIENCE:

Abstract:The effect of the rib width to height ratio t/e and width to pitch ratio t/p on the local
heat transfer distribution in a rectangular matrix ribbed channel with two opposite
in line 45° ribs are experimentally investigated for Reynolds numbers from 54000
to 150000. The rib height to channel height ratio e/H is 0.5, t/p and t/e both varies in range of 0.3-0.5. To simulate the actually situation in turbine blades, and
provide useful direct results for turbine blade designers, the parameters are same
with the blade. The experiments results show that, in comparison to fully developed
flow in a smooth pipe of equivalent hydraulic diameter, the Nusselt number inside
the matrix-ribbed rectangular channel is increased up to 5 to 9 times higher, while
total pressure drop is enlarged by up to significant magnitude. The Nusselt number
ratio increases with t/p and t/e increased. Semi-empirical heat transfer is developed for designing of cooling channel.

Translation or Not:no