By observing {HEAD ~ the changing values} of void fraction and {TAIL ~ liquid density}, an operator may observe effects of transient or abrupt changes in the fluid flow 
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By observing { HEAD ~ the changing values } of void fraction and { TAIL ~ liquid density } , an operator may observe effects of transient or abrupt changes in the fluid flow
OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH