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Enhanced impingement heat transfer using a Self-Oscillating Jet Impingement Nozzle array
xvi, 128 leaves : illustrations ; 28 cm.
18, respectively. Each S/D value correspond to the highly,
25, respectively. The maximum local heat transfer values
3, 8, 9, 10, 16 and 24 at H/D of 4. Each fell within the
350 W/m' K, at S/D of 3, 8, 9, 10, 16, and 24, respectively.
A simple modification to an in-line jet (ILJ) has been proven
addition of a collar over the nozzle exit. When extended to
An arrayto-surface spacing of 4 diameters was found to be the
average heat transfer coefficients and Nusselt numbers were
coefficients were determined to be 790, 850, 665, 490, and
coefficientsof 1030, 660, 470, and 345 W/m' K at nozzle
determined. The research involved two 0.635 cm inside
diameter SOJIN nozzles. The study consisted of acoustic
extensions were found to be 3.6 mm for the 60,000 and 100,000
following regions: 3 highly; 8, 9, 10 semi; 16 weakly; and 24
interactive regions. The optimum first stage collar
laboratory's ambient air. An infrared camera was used to
measure the temperature distribution of the impingement
measurements and heat transfer testing conducted at Reynolds
modified impinging jet nozzle has been labeled the Self-
non-interactive. The average surface heat transfer
numbers of 60,000, 100,000, and 140,000. Infrared imaging
optimum height for heat transfer purposes. The 60,000
Oscillating Jet Impingement Nozzle (SOJIN). The experiments
Reynolds number produced average surface heat transfer
Reynolds numbers, and 4.1 mm for the 140,000 Reynolds number.
S/D value investigated with a Reynolds number of 100,000 were
semi, weakly, and non interactive regions, respectively. The
separation distance-to-diameter ratios, S/D,of 3, 8, 13, and
showed small changes with respect to nozzle separation
standing wave and flow oscillations at the nozzle exit. The
surface under various operating conditions. Local and
The 140,000 produced the highest heat transfer coefficients.
The average surface heat transfer coefficients were 2030,
the proper length, the collar will create an acoustic
The transport properties of the ILJ were enhanced by the
to significantly increase its heat transfer capabilities.
was used to identify highly, semi, weakly, and non-
were conducted utilizing air jets submerged in the
"Major subject: Mechanical Engineering".
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