Evaporative cooling on a grooved surface
Wierum, Frederic A.
Master of Science
Spray evaporative cooling defines a mode of heat transfer where the drops evaporate on contact with the heated surface. Since no water accumulates on the surface, the term "dry wall" is used to described the surface condition. If while operating in the drywall mode the surface temperature is lowered, there will be a transition to a point where water will begin to accumulate on the surface. When water begins to accumulate the surface is said to be "flooded". Behavior at this transition point was investigated experimentally to determine the temperatures and corresponding heat flux at which this transition occurred. Several pressure ranges were considered including one below the triple point of water. Additionally, the results using a grooved surface were compared to those using a smooth surface. It was determined that a grooved surface has no effect on the heat transfer.