Heat transfer for a semi-confined impinging laminar jet
Jets are used for a multitude of applications such as annealing, drying, and cooling. Here, heat transfer and fluid flow aspects of a steady-state two-dimensional impinging semi-confined laminar jet are numerically analyzed for various conditions using a finite control volume method. Jet Reynolds numbers in the range {le} Re{sub w} {le} 500 are considered for non-dimensional distances from jet inlet to target plate, H/W, of 1 to 4. The effect of changing thermal boundary conditions is examined. A self-adjusting noding scheme was developed and used to increase resolution in regions where thermal conditions were changing rapidly in the direction of flow. Jet Nusselt numbers are calculated to be between 0.8 and 0.9 times the square root of jet Reynolds number at the stagnation point. The Nusselt number profile along the impingement surface is influenced by the development of a secondary vortex for larger H/W values. This vortex suppresses the heat transfer at this surface as the cooler jet fluid is redirected over the vortex. A third vortex, adjacent to the confining wall near the jet inlet, was observed for higher Re{sub w} values at H/W = 4.
- Research Organization:
- Dept. of Energy, Washington, DC (US)
- Sponsoring Organization:
- US Department of Energy
- OSTI ID:
- 20002465
- Report Number(s):
- CONF-990805--
- Country of Publication:
- United States
- Language:
- English
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