THERMAL SCIENCE

International Scientific Journal

Bo Zhang

,

Quan Hong

,

Yuanyuan Dou

,

Honghu Ji

,

Rui Chen

EXPERIMENTAL INVESTIGATION OF FLOW AND HEAT TRANSFER CHARACTERISTICS ON MATRIX RIBBED CHANNEL

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.
KEYWORDS
matrix ribbed channel, Heat Transfer Enhancement, blade cooling, aero engine
PAPER SUBMITTED: 2019-07-02
PAPER REVISED: 2019-09-11
PAPER ACCEPTED: 2019-09-19
PUBLISHED ONLINE: 2020-02-08
DOI REFERENCE: https://doi.org/10.2298/TSCI190702026Z
CITATION EXPORT: view in browser or download as text file
THERMAL SCIENCE YEAR 2020, VOLUME 24, ISSUE Issue 3, PAGES [1593 - 1600]
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Experimental investigation of flow and heat transfer characteristics on matrix ribbed channel

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