Abstract
The heat transfer of vertically impacting water sprays has been investigated experimensally using a one-dimensional mono-size spray. The liquid mass flux, droplet size and droplet velocity of the spray are independently variable in ranges. At low liquid flux, the film boiling heat transfer of an impacting spray is affected by the droplet size and velocity; however, at high liquid flux these effects become much less observable. The contribution of air convection to the overall heat transfer is low. The dominant parameter affecting the impacting spray heat transfer is the liquid mass flux. The film boiling heat transfer of impacting sprays has a power-law dependency on the liquid mass flux with the power varying from unity to a fraction as the liquid mass flux is increased.
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