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