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Heat transfer due to a round jet impinging normal to a flat surface

1993; Elsevier BV; Volume: 36; Issue: 6 Linguagem: Inglês

10.1016/s0017-9310(05)80073-0

1879-2189

A.K. Mohanty, A. A. Tawfek,

Combustion and flame dynamics

Heat transfer measurements from an isothermal plate due to an impinging air-jet from 3, 5 and 7 mm diameter circular nozzles were carried out for nozzle to plate distance ratio varied from 4 to 58, and the nozzle Reynolds number from 4860 to 34 500. Local heat transfer rates have been estimated from the outputs of three-wire differential thermocouple heat flux sensors. From the highest value at the impingement point, the heat transfer rate decays exponentially with radial distance. The effective area for a nozzle has been defined when a non-dimensional heat transfer rate, H, has decreased from unity to e−1, Q = 0.54 is a good average value.