Detailed heat transfer coefficient distributions under an array of impinging jets with coolant extraction

Book · Tue Dec 31 04:00:00 EST 1996

OSTI ID:445529

Huang, Y; Ekkad, S V; Han, J C ^[1]

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1. Texas A and M Univ., College Station, TX (United States). Dept. of Mechanical Engineering

Jet impingement cooling is a high performance technique for heat transfer enhancement. Local heat transfer distributions are presented for an array of jets impinging on a target plate with a series of coolant extraction holes. The flow enters the pressure channel, impinges on the target plate and exits toward the sides and through the coolant extraction holes. The impingement plate has four rows of 12 jet holes and the target plate has three rows of 11 coolant extraction holes. The jet holes and the coolant extraction holes have the same diameters and are staggered such that the air impinging from the jet hole does not exit directly through the extraction hole. The detailed heat transfer coefficient distributions are measured using a transient technique and liquid crystal coating. Results are presented for a range of jet Reynolds numbers between 4,000 and 20,000. The effect of crossflow is also studied by changing the exit opening of the impingement channel to provide three different spent air exit directions. Heat transfer results for the target plate with coolant extraction are compared with those without coolant extraction at the same flow conditions.

• OSTI ID: 445529
• Report Number(s): CONF-961105--; ISBN 0-7918-1520-X
• Country of Publication: United States
• Language: English

Related Subjects

42 ENGINEERING
COOLING
CROSSFLOW SYSTEMS
EXPERIMENTAL DATA
HEAT TRANSFER
JETS
NUSSELT NUMBER