Frequently used properties ·Relative velocity 一UAB -Drift velocity,uNi -Drift flux,jNJi=jNi-aNi=aN UNJi,ZjNJi=0 In two phase JABi=JA =-JB jABi =da(uA)=aa(ua-uad-upa B)=aadguaBi - For homework,derive the equation between Volume quality and mass quality,and equation between volume fraction and volume qualityFrequently used properties • Relative velocity – uAB – Drift velocity, uNJi – Drift flux, jNJi = jNi-αN j i =αN uNJi, ΣjNJi=0 – In two phase – For homework, derive the equation between Volume quality and mass quality, and equation between volume fraction and volume quality ABi A AJi A A A A B B A B ABi ABi AJi BJi j u u u u u j j j            ( ) ( )