Experimental heat transfer and discharge coefficients for multiple confined jets normal to the target surface at close distances
Permanent URL:
http://hdl.handle.net/2047/d20003120
Taslim, Mohammad (Committee member)
The test results indicate that discharge coefficient increased with increasing pitch and jet to target wall distances. For all tested geometries, the area-weighted Nusselt number, Nujet, increases monotonically with the jet Reynolds number. Increasing jet-to-jet spacing (p/d) resulted in reduced heat transfer coefficients. At lower impingement distances, p/d had a greater influence on heat transfer than at higher z/d. Highest averaged Nusselt numbers were found at z/d=1.0 (p/d=2.0) and z/d=2.0 (p/d=3.0 and 4.0). Multiple-jet heat transfer is strongly affected by jet interactions. The inner jets exhibit more changes than the outer jets with altering z/d and p/d. A correlation between the pertinent nondimensional parameters, the Nusselt number, the jet Reynolds number, the jet spanwise distance, p/d, and the jet to target plate distance, z/d, was obtained that encompasses all test data with a reasonable agreement.
jet impingement
Heat Transfer, Combustion
Mechanical Engineering
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