抄録
Heat transfer characteristics of two-dimensional impinging jet were evaluated numerically for sinusoidal velocity at nozzle exit. Numerical calculation was carried out for Reynolds number,Re=500, 1000, and frequency, f=l, 2, 5, 10[Hz] at Prandtl number Pr=0.71. Local heat transfer is improved or is depressed within one period for low frequency. However, it is enhanced for high frequency within the present numerical conditions. Therefore, the frequency region which gives the heat transfer improvement, is determined for each Reynolds number.
