Effects of crossflow temperature on heat transfer within an array of impinging jets

Journal Article · Sun Feb 01 04:00:00 EST 1987 · Journal of Heat Transfer (Transcations of the ASME (American Society of Mechanical Engineers), Series C); (United States)

DOI:https://doi.org/10.1115/1.3248072· OSTI ID:5482761

Florschuetz, L W; Su, C C ^[1]

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1. Arizona State Univ., Tempe (USA)

Two-dimensional arrays of circular air jets impinging on a heat transfer surface parallel to the jet orifice plate are considered. In the experimental model the jet flow, after impingement, was constrained to exit in a single direction along the channel formed by the jet orifice plate and heat transfer surface. In addition to the crossflow that originated from the jets following impingement, an initial crossflow was present that approached the array through an upstream extension of the channel. By varying the initial crossflow temperature, the mixed-mean crossflow temperature approaching each spanwise jet row n(T{sub m,n}) was varied independently of the jet temperature (T{sub j}). For each row, the effect of T{sub m,n} relative to T{sub j} on the heat flux opposite the row was determined. Results are formulated in terms of parameters defined for each individual spanwise row domain: a crossflow-to-jet temperature difference influence factor ({eta}{sub r}) and a Nusselt number (Nu{sub r}) as functions of jet Reynolds number, crossflow-to-jet mass flux ratio, and geometric parameters. Effects of row position within the array are also considered. It was found that {eta}{sub r} and Nu{sub r} are nominally independent of row position after the first two rows.

• OSTI ID: 5482761
• Journal Information: Journal of Heat Transfer (Transcations of the ASME (American Society of Mechanical Engineers), Series C); (United States), Journal Name: Journal of Heat Transfer (Transcations of the ASME (American Society of Mechanical Engineers), Series C); (United States) Vol. 109:1; ISSN 0022-1481; ISSN JHTRA
• Country of Publication: United States
• Language: English

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ELECTRONIC EQUIPMENT
ELEMENTS
ENERGY TRANSFER
EQUIPMENT
GAS TURBINES
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