A first part of the air stream which is admitted into the portion 23 is swirled by the member 40 to form a swirling stream having a ring shaped cross sectional outline and contacting the outermost layer of the flow of liquid issuing from {TAIL ~ the end portion} of {HEAD ~ the section} 31 
A first part of the air stream which is admitted into the portion 23 is swirled by the member 40 to form a swirling stream having a ring shaped cross sectional outline and contacting the outermost layer of the flow of liquid issuing from { TAIL ~ the end portion } of { HEAD ~ the section } 31
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH HEAD HEAD HEAD HEAD HEAD HEAD OTH