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Dec. 25, 1962 w. K. FORTMAN 3,070,313 APPARATUS FOR THE ACOUSTIC TREATMENT OF LIQUIDS Filed March 5, 1962 A INVENTOR WILLIAM K. FORTMAN BY imwl H. K'Ra, ATTORNEY United States Patent 0" 3,070,313 Patented Dec. 205, 1962 2 1 3,070,313 spider there is provided a supporting stem 24 which may be moved axially by means of adjusting screw 25. When OF LIQUIDS William K. Fortman, Syosset, N.Y., assignor to Astrosonics, Inc., Syosset, N.Y. Filed Mar. 5, 1962, Ser. No. 177,395 7 Claims. (Cl. 239—102) the spider, supporting stem, and screw, in position. The portion of the hole extending through members 21 and 23 may be drilled in advance. Resonator cup 30 is pinned APPARATUS FOR THE ACOUSTIC TREATMENT a suitable axial position is attained, as indicated by a desired spray pattern, a hole is drilled into supporting stem 24 and screw 25 and a locking pin 26 inserted to lock to the end of supporting stem 24 by pin 32. It will be This invention relates to an improved apparatus for the acoustic treatment of liquids. The apparatus may, 10 noted that member 22 is provided with a conical bore forming a restricted throat 34 which again tapers out by way of example and without intent to be limiting, be employed for atomization, spray-drying, agglomeration of airborne contaminants, and/or deposition of liquids wardly in a downward direction at about a 15° angle to form nozzle 14. The throat dimension should be de slgned to provide an increase of air velocity to about by subjection of the liquid to sonic energy. Brie?y stated, the invention employs an acoustic gen 15 Mach 1.0. The subsequent increase in diameter to form expanded nozzle 14 results in achieving of a velocity of erator of the Hartmann type, such as disclosed, for ex about Mach 1.5. . ample, in US. Patent No. 2,519,619 to Yellott and Savory The mode of operation of the acoustic generator is for “Acoustic Generator.” The liquid to be treated is well described in the literature as, for example, in the dispensed through an annular premixing chamber which aforementioned US. Patent No. 2,519,619, and accord uniformly distributes the liquid through jet ori?ces into ingly need not be described herein. the sonic ?eld produced by the acoustic generator. The liquid to be treated is introduced through ?tting It is a feature of this invention to provide a sonic energy 11 and passes through tube 35 into an annular mixing re?ector so located as to prevent ?uids from contaminat chamber 38. ing the resonator. The body member 39 enclosing chamber 38 may readily Still another feature of this invention is to provide a sonic energy spray nozzle requiring relatively low gas and liquid operating pressures. be formed by ordinary machining techniques. The body member is composed of two major sections. The ?rst is an annular member 40 provided with an open annular recess. Member 40 threads onto body portion 22 of the 30 acoustic generator. The other section comprises an annu A particular feature of this invention is to provide a lar cover member 42 which threads into body 40 to de?ne spray nozzle of the type described wherein the liquid in the enclosed annular chamber 38. O-rings 44 and 46 let ori?ces may be positioned at an optimum distance from provide a liquid tight seal between members 40 and 42. the resonator. Liquid is dispensed through ori?ces 18 extending into These and still other objects and advantages of the annular chamber 38. The method of assembling the annu invention will, in part, be pointed out with particularity lar chamber to the acoustic generator is advantageous as and will, in part, become obvious as the following de it permits employment of one acoustic generator with a scription proceeds taken in conjunction with the accom wide range of annular chamber assemblies having a differ panying drawing. ent distribution arrangement or ori?ce size. The chamber In the drawing: 40 should be sufficiently large as to permit free circulation FIG. 1 is a perspective showing of the spray apparatus and uniform distribution of the liquid to all ori?ces. By of this invention. way of example, a chamber 1A” x %” has been found to FIG. 2 is a vertical section taken through the center ‘be suitable. A spacing between the bottom of the annular of the apparatus. _ chamber (at the ori?ce) to the midpoint between the end FIG. 3 is a section taken along line 3-3 of FIG. 2. of the nozzle 14 and the resonator 30 of one wavelength Referring now to FIG. 1 of the drawing, there is shown at the frequency at which the resonator is operating has a plane wave spray nozzle designated generally by the been found suitable. Generally an operating frequency in reference numeral 10. A standard Ms” pipe ?tting 11 is the range of 7000 to 9500 c.p.s. is preferred. provided for coupling to a liquid supply and a standard Thus as the sonic energy ?eld is generated in the well 16, %” pipe ?tting 12 is provided for coupling to a gas sup 50 it is directed upwardly toward the radial face 41 of mem ply. The gas supply may be steam, air, inert gases such ber 39. The radial face serves to beam the sonic energy as nitrogen, highly reactive gases such as oxygen and ?eld downwardly and outwardly so that the energy is not chlorine, solvent gases such as carbon tetrachloride vapor randomly dissipated. At the same time the liquid is or other compressible ?uid. into the ?eld. Gas passing through nozzle 14 is compressed in resona 55 injected The following experimental results were obtained em tor cavity or well 16, as explained in the aforementioned ploying a device as described having 8 ori?ces, each 0.40" US. Patent No. 2,619,619. Liquid is simultaneously in diameter. sprayed into the sonic field for treatment. It has been found that some liquids will dry faster into particles or Operational range (air) _________..p.s.i.g__ l5—60 beads after exposure to the sonic ?eld. Many gelatines Volumetric ?ow range (air) _______s.c.f.m__ 14-33 and waxes will fall to a collection basin in dry form after Frequency range _________ ________ __c.p.s__ 7000-9500 spraying into a sonic ?eld at room temperature. Other Flow conditions: materials need to be sprayed into a heated atmosphere 006 g.p.m__ 0.5 lb./min. 20~40 micron droplets‘. 1.92 g.p.m__ 16.0 lb./min. 300-400 micron droplets. for drying to occur. The internal construction of the apparatus is shown in 65 Having thus disclosed the best embodiment of my FIGS. 2 and 3. While a 300 series stainless steel in gen A further feature of this invention is to provide an im proved, sonic energy liquid treating apparatus. erally suitable, for special applications cermets, ceramics invention presently contemplated, it is to be understood and other suitable materials may be employed. The body 20 is conveniently machined of two mating pieces 21 and without departing from the spirit of the invention. 22, respectively, which are force fit to form a unitary 70 member. Force ?t within portion 21, there is provided a spider 23. Fitting within a central bore formed in the that variations may be made by those skilled in the art What is claimed is: 1. An apparatus for treating liquids by sonic energy comprising: - 3,070,313 3 4 an acoustic generator having an ori?ced nozzle for producing a ?uid jet; an oscillator having a well in spaced opposed relation ship to said nozzle ori?ce; a member surrounding said acoustic generator, said 5 member de?ning an annular liquid-receiving chamber and having a plurality of holes communicating from 7. An apparatus for treating liquids by sonic energy comprising: an acoustic generator for producing a sonic energy ?eld having an ori?ced nozzle for producing a ?uid jet; a rod extending axially into said ori?ce; an oscillator, having a well inv spaced opposed relation- ‘ ship to said nozzle ori?ce supported by said rod and for producing a sonic ?eld directed towards said the’chamber to an exterior portion of said member above said nozzle ori?ce; and conduit means for introducing liquid into said chamber. 10 2. The apparatus of claim 1 wherein said member is detachable from said acoustic generator. 3. The apparatus of claim 1 provided with a throat portion of lesser diameter than said nozzle immediately 15 upstream from said nozzle. 4. The apparatus of claim 3 in combination with a compressible ?uid source under su?icient pressure to pro duce a ?uid jet having a velocity of at least Mach 1 at said throat and in excess thereof at said nozzle. 20 5. The apparatus of claim 3 in combination with a source of a compressible ?uid at su?icient pressure to produce a fluid jet at said nozzle in excess of Mach 1. 6. An apparatus for treating liquids by sonic energy comprising: an acoustic generator having an ori?ced nozzle for 25 nozzle; means to axially move said rod; a member surrounding said acoustic generator and having a radial face positioned in the path of said ?eld upstream, with reference to the fluid jet from this nozzle, said member de?ning an annular liquid receiving chamber having a plurality of holes com municating therefrom to said radial face and arrangeda to dispense liquid into the resultant sonic ?eld; and conduit means for introducing liquid into said chamber. References Cited in the ?le of this patent . UNITED STATES PATENTS 1,939,302 2,481,620 2,519,619 2,908,443 2,944,029 Heaney ______________ __ Dec. 12, 1933 Rosenthal ____________ __ Sept. 13, 1949 Yellott et a1 ___________ __ Aug. 22, 1950 Fruengel _____________ __ Oct. 13, 1959 Jones et a1. ____________ "July 5, 1960 producing a ?uid jet; OTHER REFERENCES a rod extending axially into said ori?ce; Institute of Radio Engineers, Transaction on Ultra an oscillator, having a well in spaced opposed relation 30 Sonic Engineering, an article by I. V. Antonevich, Febru ship to said nozzle ori?ce supported by said rod; ary 1959, pages 6-15. means to axially move said rod; “Ultrasonic Engineering,” A. E. Crawford, Butter a member surrounding said acoustic generator, said worth’s Scienti?c Publications, London 1955, pages 113~ member de?ning an annular liquid-receiving cham 122. ber and having a plurality of holes communicating from the chamber to a portion of said member above said nozzle ori?ce; and conduit means for introducing liquid into said chamber. Chemical Engineering, September 4, 1961, pages 84 and 86, “Sound Waves Form Uniform Drops In Spray Nozzle” by Astronics, Incorporated, Syosset, Long Island, N.Y.