it will be readily understood that the components of the present invention , as generally described and illustrated in the drawings herein , could be arranged and designed in a wide variety of different configurations . thus , the following more detailed description of the embodiments of the system and method of the present invention , as represented in the drawings , is not intended to limit the scope of the invention , as claimed , but is merely representative of various embodiments of the invention . the illustrated embodiments of the invention will be best understood by reference to the drawings , wherein like parts are designated by like numerals throughout . referring to fig1 , while continuing to refer to fig1 through 14 generally , a silencer 10 or separator 10 may be configured as an air - blade , silencing , separator apparatus and method . accordingly , it will be appropriate to speak of the subsystem 10 as a silencer , a separator , an air - blade , or the like . the subsystem 10 may also be referred to as a silencer - separator , since it functions as both , and was designed , experimented , evaluated , operated , redesigned , modified , dozens upon dozens of times in order to obtain its combination of silencing and separating effects . by silencing is meant the reduction in sound propagated outside a diffuser 12 or system 12 in operation . by separating is meant the separation from a flow of air , certain , entrained droplets in the flow of air . typically , as used herein , the expression separator or separating refers to removing “ comparatively larger ” droplets . comparatively larger droplets refer to those droplets that are sufficiently large that their mass , and therefore their weight under the influence of gravity , are sufficiently large compared to their aerodynamic drag in a flow of modest to velocity , typically the circulation of room air , that such droplets will fall out of the flow of air within the room , typically 15 to 20 feet . however , comparatively smaller droplets remain in the airflow constitute the objective . thus , comparatively smaller droplets are those that are sufficiently small that they will drift in a flow of air at modest velocities , typically associated with ventilation motion of the air in a ventilated room , indefinitely . indefinitely means at least an hour or more , and will typically be several hours , or until the room air has been effectively exchanged . in a system 12 equipped with a silencer - separator 10 , the system 12 is effectively constituted as a cold - air , diffusion apparatus 12 , also referred to simply as a diffuser 12 . a diffuser 12 may draw from a reservoir 14 containing a suitable liquid . liquids typically may include essential oils , mixtures of solvents with the essential oils , emulsions of water , other liquids , or the like . typically , the content or liquid in a reservoir 14 is drawn through a tube 15 or line 15 penetrating to a location near the bottom of the reservoir 14 . an atomizer 16 draws liquid content from the reservoir 14 through the line 15 to be atomized . by atomization is meant the breaking up of a liquid , flow of liquid , or the like into a random distribution , which will typically be a gaussian distribution , also known as a normal distribution . atomization may be done by a venturi or an eductor . a venturi is a conduit narrowing to a throat through which a flow of fluid passes , the conduit progressing from a comparatively larger diameter to a smaller diameter and ultimately to a narrowest diameter , followed by an increase in diameter . by the word diameter is meant hydraulic diameter . a hydraulic diameter is four times the area divided by the wetted perimeter . in a circular cross - sectional area , hydraulic diameter equals circular diameter . in a square cross section , hydraulic diameter equals the length of one side . in any other shape of a cross section , the hydraulic diameter provides a value that may be used for effective diameter in hydrodynamic or aerodynamic equations of flow . hydraulic diameter relates the cross - sectional area to the shape of the perimeter or circumference of or about a flow . thus , in speaking of diameter , the expression means effective diameter or hydraulic diameter . that is , any time the word diameter is used , what is meant is the effective diameter . a venturi relies upon dynamic pressure head . typically , in a flow through a venturi , dynamic pressure head is substantially constant . there is some amount of drag , but it is substantially negligible in many instances . thus , assuming a constant , dynamic pressure head means that the static pressure contribution and the velocity contribution to dynamic pressure head add to the same constant value throughout . thus , whenever the cross - sectional area narrows , the velocity must increase . thus , the velocity head component must increase , causing a reduction in the static pressure head contribution . the result of the reduction in static pressure head at the narrowest portion or the throat of a venturi results in a low pressure region that tends to draw against the walls . thus , a penetration , tube , pipe , or a port in a wall , or the presence of a tube , inlet , or other access by a second fluid at the exact throat ( narrowest portion ) of a venturi will result in drawing that fluid into the flow . an eductor is an entirely different mechanism . an eductor is a device found in virtually all gas stoves , gas furnaces ( e . g ., propane , natural gas , butane , etc .) and has been for decades , in fact , over a century . likewise , eductors are used in various pumping systems , particularly for pumping fluids that will damage pumps . sewage is one example . for example , pumping a flow of sewage sludge is not appropriate for a mechanical pump . damage by wear and corrosion would be swift and certain . instead , a cleaner fluid may be injected as a high speed jet relative to a comparatively low speed flow of sludge . the high speed jet imparts momentum from itself ( e . g ., small mass , high velocity ) to the flow of sludge ( e . g ., large mass , comparatively low velocity ). an eductor thus relies on direct momentum transfer between a first flow at a comparatively higher velocity into a second flow at a comparatively lower velocity . momentum transferred from the higher speed jet into the lower speed surrounding fluid results in motion of the comparatively slower mass of fluid , resulting in drawing in more of that surrounding fluid into the jet as it progresses forward . eductors 18 have been described in considerable detail , along with their operation , in the references incorporated hereinabove by reference . typically , an eductor 18 may be made up of a variety of components , resulting in a flow of air therethrough shattering or comminuting liquid , received through the tube 15 , in an eductor jet 28 , not shown in entire detail here , but included in great detail in the references incorporated herein by reference . the atomizer 16 may include a housing 17 , as a part of which the eductor 18 may fit its own seals 22 air jet nozzles 24 including a jet aperture 25 all fitted into a housing 26 for containment . the eductor nozzle 28 receives air from the jet opening 25 through the eductor nozzle 28 , thus drawing with it liquid captured therebetween , that is , between the air nozzle 24 and the eductor nozzle 28 . thus , out of an opening in the eductor nozzle 28 sprays an airflow containing a distribution of droplets of the liquid content drawn from the reservoir 14 . the droplets from the eductor 18 enter a separation chamber 20 a or drift chamber 20 a . the drift chamber 20 a may also be referred to as a separator 20 a . a separator 20 , generally , operates by several mechanisms . first of all , the specific separation chamber 20 a as constituted by the housing 17 , presents a wall against which the flow will impinge . comparatively larger droplets will tend to strike the wall . comparatively smaller droplets will tend to remain in the flow of air . that is , comparatively larger droplets having more mass , and therefore more weight , associated with greater momentum within themselves , are sufficiently heavy that they cannot change direction due to the insufficient aerodynamic drag of air flowing thereby . accordingly , comparatively larger droplets strike a wall , coalesce there or shatter . to the extent that the droplets coalesce , they will drift downward toward the reservoir 14 . to the extent that the droplets shatter , comparatively larger portions may again be subjected to coalescing against the wall . sufficiently small droplets will be entrained ( carried by aerodynamic drag ) within the airflow , eventually finding their way out of an exit from the drift chamber 20 a . a separator plate 30 may divide the separator chamber 20 a of the atomizer 16 from a second separation chamber 20 b or drift chamber 20 b of the silencer - separator 10 . trailing letters or reference numerals indicate a specific instance of the item type identified by the numeral . the silencer - separator 10 may begin at its lower extremity with a neck 32 . the neck 32 may include a collar portion 34 or collar 34 that has a smaller or larger diameter than does the neck 32 . in the illustrated embodiment , the collar 34 has a smaller diameter , in order to fit into the housing 17 of the atomizer 16 . in other embodiments , the collar 34 may have a larger diameter than the neck 32 , thus forming a detent 34 to constrain the neck 32 within the housing 17 of the atomizer 16 . in other embodiments , threads may substitute for any other retainers . however , in the illustrated embodiment , one purpose for the collar 34 is to provide a close fit against the surface 36 in the housing 17 . likewise , a registration 38 or notch 38 in the neck 32 fits against a matching or mating protrusion on the surface 36 . thus , by not being threaded , the neck 32 may slide into the housing 17 , with the collar 34 snuggly fitting against the surface 36 , and being rotatable for registering the registration 38 or notch 38 therein . registration 38 assures that the channel 40 or air blade 40 itself is opposite the eductor nozzle 28 of the atomizer 16 . this , as it turns out , is important for reducing sound . sound waves propagate up through the channel 40 or air blade 40 . the channel ( cavity ) 40 may be called an air blade 40 and creates a blade of air or an air blade , because it has a comparatively narrow thickness relative to both its overall width , and its overall length in the direction of flow ( e . g ., vertically ). the air blade 40 or channel 40 , by being positioned obliquely , in fact a right angle , in the illustrated embodiment , with respect to the flow of the eduction spray , provides much damping , and uncoupling of the soundwaves by virtue of the difference in characteristic lengths between it and the surrounding drift chamber 20 b . various characteristic lengths ( e . g ., diameter , varied diameter along its height , depth , varied depth in view of the capered bottom surface , and so forth ) exist throughout . referring to fig1 , while continuing to refer generally to fig1 through 14 , a silencer - separator 10 may include a channel 40 or air blade 40 defined by a wall 42 around a tower 43 . the wall 42 may include an inner portion 42 a and an outer portion 42 b . typically , the outer portion 42 b will extend down and through the separator plate 30 . accordingly , the actual outer wall 42 b may eventually be coincident or share an inner surface with the neck 32 at the bottom of the silencer - separator 10 . referring to fig2 and 3 , and fig1 through 14 generally , one will see that assembled , the system 12 may include a reservoir 14 , threaded onto an atomizer 16 , with a silencer - separator 10 fitted into the upper opening of the atomizer 16 . effectively , the bowl 44 or bowl portion 44 of the silencer - separator 10 defines the wall surrounding the second drift chamber 20 b . by drift chamber 20 is meant that an airflow containing droplets flows through the drift chamber 20 , permitting comparatively larger ( higher momentum , lower drag ) droplets to drift out of the flow of air to impinge against solid surfaces , there coalescing to become a film , rivulets , and drops that eventually drip downward to return to the reservoir 14 . the bowl 44 is closed on top by a cap 46 . the cap 46 is comparatively snuggly fitted in order to not pass any significant amount of fluids through the seal or fit therebetween . referring to fig4 through 10 , while continuing to refer generally to fig1 through 14 , the bowl 44 and cap 46 may be provided with a registration 48 or notch 48 adapted to receive a protrusion in the cap 46 , fitted thereto . one will note that the registration 48 is illustrated as a notch , but could be a protrusion , a spline , a key , or the like . typically , a collar on the cap 46 may slide with a friction fit into the bowl 44 . one benefit of a sliding fit , snap fit , or the like is that the registration 48 may be matched with a corresponding registration 49 on the cap 46 . thus , the bowl 44 and cap 46 may be visibly rotated with respect with one another in order to match up the registration 48 at the appropriate location . the effect of the registration 48 is to establish the position of the air blade 40 with respect to the outlet 50 . typically , the registration 48 and its matching pin 49 may be reversed or may be changed in any suitable manner , so long as registration therebetween is promoted . effectively , the outlet 50 serves best if offset by at least 90 degrees from the plane or center plane that would effectively form a reflectively symmetric surface passing vertically through the tower 43 , air blade 40 , and its walls 42 . as a practical matter , it is proper to speak of the air blade 40 as the channel 40 , or as the flow of air 51 therethrough . thus , the flow 51 through the channel 40 represents an air blade 40 , 51 . similarly , one may speak of the air blade as the structure 42 or walls 42 that form the channel 40 that passes the flow 51 . thus , herein , the term air blade 10 , 40 , 43 , 51 should be clear from its context . it has been found that the outlet 50 serves best if offset by 180 degrees from the channel 40 , or the center line or center plane through the channel 40 . one may think of a center plane through the channel 40 as a vertical plane extending upward and horizontally bisecting both the inner wall 42 a and outer wall 42 b around the channel 40 . the separator plane or dividing plane would thus form a vertical plane of symmetry for the air blade 40 , the flow 51 , the walls 42 , the bowl 44 , the cap 46 , and so forth . referring to fig5 through 10 , while continuing to refer generally to fig1 through 14 , the silencer - separator 10 is not entirely symmetrical or axially symmetrical . for example , the cap 46 and bowl 44 are largely point symmetrical or axially symmetrical . nevertheless , the walls 42 are clearly not line or point symmetrical , being offset from the center , and curved along a circumferential direction to be uniformly spaced away from the bowl 44 itself . the bowl 44 and cap 46 may be fitted together with a notch registration 38 and a corresponding pin 49 or peg 49 . meanwhile , proceeding circumferentially around virtually the entire circumference of the cap 46 may be a capillary break 52 . a capillary break 52 constitutes a gap 52 sufficiently large that capillary action of the contained fluid droplets coming from the eductor and coalescing in the bowl 44 will not cross . accordingly , oil will not collect or seep out of the gap or the sealing surfaces between the bowl 44 and the cap 46 . for example , the vertical surface 53 may be comparatively tight , and therefore may attract , due to surface tension , collection of a certain quantity of oil or other contents being coalesced from droplets . however , the capillary break 52 interferes with transport to anywhere outside the bowl 44 . regarding asymmetric features of the silencer - separator 10 , one will immediately note that in fig9 the inner wall 42 a angles downward . the lower edge 54 acts as a drip edge 54 . for example , the channel 40 between the inner wall 42 a and outer wall 42 b constituting the walls 42 or wall region 42 develops a slot flow profile as well understood in engineering . any basic , engineering , fluid - mechanics book will describe conditions and show the flow profile for a laminar flow and for a turbulent flow in a narrow passage . in either event , a boundary layer near the surfaces of the walls 42 a , 42 b will form , moving very slowly and collecting liquid droplets that touch the walls 42 a , 42 b . droplets thereby adhere to the walls 42 and other liquids coalesce thereagainst . a direct result is a flow down the inside surfaces of the channel 40 . that flow along the outer wall 42 b will eventually find its way down into the housing 17 and neck 32 of the atomizer 16 , and thereby to the reservoir 14 . meanwhile , any coalesced droplets that impinge against the inner surface of the bowl 44 will drain downward toward the drain 58 . one will note that the drip edge 44 , by being angled downward from one extreme to the other , creates a drip point 56 at the lowest location 56 of the drip edge 54 . droplets coalescing against the inner wall 42 a , within the channel 40 will flow down to the drip edge 54 , and thence to the drip point 56 , where they will form droplets that will readily drop back into the housing 17 from the neck 32 . droplets tend not to stop along the drip edge 54 , but collect and move downward toward the drip point 56 . thus , droplets collected from the channel 40 will typically adhere to the wall 42 , move toward the outer wall 42 b , and thereby drip back through the neck 32 and into the housing 17 and reservoir 14 . the drain 58 may be provided with a breaker 60 or surface tension breaker 60 constituted by a sharp edge or multiple sharp edges on a protrusion 60 away from the neck 32 . this protrusion 60 may have sharp edges in order to promote the formation of droplets therearound , stripping them from the drain 58 , so they do not collect , become blocked , or otherwise form larger droplets suspending from the drain 58 . the breaker 60 operates as a surface tension breaker 60 providing a solid surface promoting flow away from the drain 58 . in general , the capillary break 52 , the surface tension breaker 60 , the drip edge 54 and drip point 56 , and so forth are innovations deemed appropriate in order to encourage complete draining of liquids from the silencer - separator 10 . typically , the system 12 may be taken apart , the reservoirs 14 may be changed out with different contents , and so forth . by encouraging prompt and complete draining of all liquids back to the reservoir 14 , the silencer - separator 10 is maintained cleaner , will be less likely to drip or otherwise transfer oily contents to the hands or clothing of a user , or to a surface on which any component may be temporarily set when dismantled . referring to fig9 , while continuing to refer generally to fig1 through 14 , one will note that the port 50 or outlet 50 also includes a wall 62 protruding into the drift chamber 20 b formed by the bowl 44 and cap 46 . this provides several benefits . first , the wall 62 provides a requirement for a change of direction , and multiple changes of direction of airflows . for example , an airflow 51 exits substantially vertically . thence , the flow 51 will impinge against the cap 46 , particularly , an inner , horizontal surface 64 thereof . thereafter , the flow 51 will be diverted to flow in other directions throughout the drift chamber 20 b . to the extent that airflow progresses radially , it may impinge against the inner surface 66 of the bowl 44 . ultimately , a flow 70 may exit the outlet 50 . however , at least three changes of direction must occur in most of the flow 51 in order for the flow 51 or droplets and air within the flow 51 to exit the channel 50 , since the air blade 51 comes to a halt due to striking the inside surface 64 of the cap 46 , progress horizontally , radially , and the like in order to reach the outlet 50 . the flow must then turn to progress vertically out through the port 50 . moreover , the change of shape between the comparatively thin but wide air blade 51 from the channel 40 and the comparatively narrow , typically circular or otherwise cylindrical shape of the outlet 50 , requires expansion of the flow into a larger area , out of a comparatively smaller cross - sectional area . it then reduces from that comparatively larger cross - sectional area back into an even smaller cross - sectional area of the exit 50 . this repeated change of cross - sectional area available to accommodate the flow also results in drifting , slowing , and jinking ( zig - zagging , sharp turns back and forth , darting ), which action therefore provide more dwell time , repeated acceleration and deceleration of flow , and so forth to promote more drifting and smashing by comparatively larger droplets against solid surfaces . only droplets small enough that their mass , momentum , and fluid dynamic drag permit them to remain with the air flow through all its twists , turns , stops , starts , accelerations , and decelerations will remain in that flow when it exits the systems 10 , 12 . this is the ultimate definition of “ small ” droplets , those that exit the separator 12 with the air flow . at any space , conduit , path , location , or the like , the “ comparatively larger droplets ” are those that strike a solid surface and coalesce . “ comparatively smaller droplets ” remain entrained in , and exit that space with , the flow of air therethrough . the silencer - separator 10 illustrated has proven highly effective in eliminating the sound of hissing generated by an atomizer 16 , and particularly the eductor 18 . it is also very effective at eliminating comparatively larger droplets in the airflow 70 proceeding from the outlet 50 . those comparatively larger droplets are those that would otherwise drift downward at an unacceptable rate to land on furniture , counters , and flooring . the objective is for all droplets released to evaporate or drift with room air indefinitely or sweep out with ventilation air exiting the treated space . the sound is minimized , typically reduced by from about six to about ten decibels in volume ( intensity , amplitude ), and typically provides on the order of about eight decibels of reduction of sound when the outlet 50 is 180 degrees out of phase with respect to the tower 43 of the air blade 51 . meanwhile , the elimination of comparatively larger droplets or “ spitting ” droplets that are sufficiently large to settle out on furniture or other surfaces nearby is eliminated so long as the cap 46 has been rotated to place the outlet 50 at about 90 degrees or greater out of phase with the center plane of the air blade 40 . other features of a silencer - separator 10 in accordance with the invention are the various changes in cross - sectional area , shape , and so forth . by providing suitable taper to the shape of the bowl 44 , the variation in diameter tends to avoid establishing a single resonant length that may promote resonant frequencies of audible sound waves during operation of the system 12 . likewise , by canting or tilting the separator plate 30 that operates as a floor 30 of the bowl 44 , a single resonant length or height is less likely . similarly , below the floor 30 ( i . e ., separator plate 30 ), vertical height is affected by the angled separator plate 30 . the shape of the tower 43 and air blade 51 is capable of accomplishing several functions . first , maintaining a distance from the exit 50 or outlet port 50 is accommodated by wrapping the walls 42 along the path substantially parallel to the surface 66 inside the bowl 44 . also , this provides for maintaining distance away from the outlet 50 . although a straight ( non curved ) channel 40 may operate to provide the separation function of the channel 40 , coalescing droplets along the walls 42 a , 42 b , the sound is prevented from obtaining consistent characteristic lengths by the curvature , and its resulting distribution of the flow 51 throughout the drift chamber 20 b . in other words , care has been taken to reduce the incidence of single , characteristic lengths that might promote or support resonant frequencies that may increase propagation of sounds . referring to fig8 through 14 , the various views of the silencer - separator 10 illustrate the relative dimensions and shapes involved . for example , the neck 32 is comparatively smaller , and capable of fitting within a housing 17 of an atomizer 16 available . meanwhile , the comparatively larger diameter of the bowl 44 provides substantial drift space , substantial increase in cross - sectional area of the flow , multidirectional dispersion of the flow 51 , and so forth . meanwhile , the rear elevation , front elevation , right side elevation , and left side elevation views show substantial symmetry , with only small variations . nevertheless , internally , the pleasing symmetry of the exterior is absent and does not limit the ability to form non - symmetric shapes , flow areas , transitions , changes of direction , and the like therewithin . one will also note the manufacturing elegance of the outer wall 42 b being essentially coincident with the neck 32 generally . meanwhile , the formation of the channel 40 by the inner wall 42 a , may be molded from the two sides or surfaces of the separator plate 30 that forms the floor 30 of the bowl 44 , and the sealing of the first drift chamber 28 in the housing 17 . an additional separator plate , or even a micro - cyclone may still be placed below the system 12 . the present invention may be embodied in other specific forms without departing from its purposes , functions , structures , or operational characteristics . the described embodiments are to be considered in all respects only as illustrative , and not restrictive . the scope of the invention is , therefore , indicated by the appended claims , rather than by the foregoing description . all changes which come within the meaning and range of equivalency of the claims are to be embraced within their scope .