Fluid spray for generating rectangular coverage

Spray apparatus for evaporational cooling of tubular media, the upper surfaces of which define a generally planar surface comprising a conduit carrying liquid under pressure and disposed above and generally parallel to said surface, at least one pair of nozzles depending in axially spaced relation from said conduit, each nozzle having an internal spherical end wall surface and an orifice opening through said spherical end wall surface and extending over an obtuse angle, said orifice being defined by upper and lower edges spaced apart from three-sixteenths inch to three-fourths inch, said orifice intersecting said spherical surface to provide a spherical surface below said orifice of about five-eighths to three-fourth the surface area of a hemisphere of the same radius as said spherical surface, each nozzle generating an arcuate spray of liquid droplets in generally parallel, superposed spaced relation to said planar surface of said tubular media, said nozzles being disposed in axially spaced relation on said conduit with the orifice of one nozzle opening directly toward the orifice of the other nozzle with the geometric center of each spray in general alignment with the axis of said conduit, the spacing between said pair of nozzles being such that the droplet velocity of the spray of each nozzle generated by a water pressure of 0.5 to 10 psi is attenuated by impact with the spray of the other nozzle, said attenuation being a maximum in a direction parallel to said axis and decreasing to a minimum as the spray angle from each nozzle increases toward a direction transverse to said axis whereby a generally rectangular spray pattern is deposited on said tubular media with its major dimension transverse to said conduit.