An experimental study was conducted to determine the effect of pulsation duty cycle on the heat transfer rates between an axisymmetric jet of air and a flat impingement surface. In all experiments the jet was heated and a pulsed flow field was generated using a high-speed solenoid valve. The duty cycle of the valve (on time divided by total cycle time) was adjusted using a repeat cycle timer and results are presented for duty cycles ranging from 0.20 to 0.73. Heat transfer rates to a finite area disk have been found to vary by up to 25% depending upon the duty cycle of the flow and the jet to plate spacing. The highest heat transfer rates are associated with the pulsed case with a large duty cycle. Numerical simulations of this experiment are being developed concurrently. This dual-mode approach, allows experimental validation of the numerical model followed by numerical experimentation in regimes not attainable with the experiment.
|Original language||English (US)|
|Number of pages||6|
|Journal||American Society of Mechanical Engineers, Heat Transfer Division, (Publication) HTD|
|State||Published - 1996|
ASJC Scopus subject areas
- Mechanical Engineering
- Fluid Flow and Transfer Processes