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