The effect of drainage configuration on heat transfer under an impinging liquid jet array
Impinging jets provide high transport coefficients which make them attractive for use in applications such as paper drying, quenching of metals, turbine blade cooling, and thermal control of a variety of high heat flux devices (electronics, X-ray optics, etc.). Here, the heat transfer characteristics of single and dual-exit drainage configurations for arrays of liquid jets impinging normal to a heated isoflux plate has been studied experimentally. The interaction of drainage channel crossflow from upstream jets and the stagnation jets and its impact on heat transfer was the focus of the investigation. Infrared thermography was used to measure the local temperature distribution on the heated plate, from which local heat transfer coefficients were determined. A single jet diameter was used, and jet arrays with jet-to-jet spacings of 4.8, 6, 9, and 12 jet diameters were studied. Average jet Reynolds numbers in the range 400--5,000 were investigated for jet nozzle-to-impingement plate spacings of 1, 2, and 4 jet diameters for fully flooded (submerged) drainage flow. A single jet-to-plate spacing large enough to yield free-surface jets was also studied. The data reveal a complex dependence of local and average Nusselt numbers on the geometric parameters which describe the problem configuration.
- Research Organization:
- Brigham Young Univ., Provo, UT (US)
- OSTI ID:
- 20005620
- Journal Information:
- Journal of Heat Transfer, Journal Name: Journal of Heat Transfer Journal Issue: 4 Vol. 121; ISSN 0022-1481; ISSN JHTRAO
- Country of Publication:
- United States
- Language:
- English
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