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 {HEAD ~ the end portion} of {TAIL ~ the section} 31 
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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 { HEAD ~ the end portion } of { TAIL ~ the section } 31
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