pressure changes to be Satm, if it is required that the gas flows in the tube at the same temperature rate and mass velocity, what's the inside diameter of the tube? Solution: Suppose the subscribe l as the state under latm and subscribe 2 as the state under 5atm In the two cases ws=w2=w T=T,=T l because W,=MAP=u,A,P2 A=-d P,=p, 2P1 TP2 PI pI P2 p2 temd2=d1P=0071=0013m 10. As shown in the figure, the feed liquid whose density is 850kg/m is sent into the tower from the elevated tank The liquid level of the elevated tank keeps constant. The gauge pressure in the tower is 0. lkgf/cm2, and the feed rate is 5m/h. The connected pipe is steel pipe( 38x2. 5mm), the energy loss in the connected pipe of the feed liquid is 0. lkgf/cm(the energy loss in the exit is not included). what is the distance between the liquid level of the elevated tank and the feed inlet? Solution: Suppose the liquid level of header tanker as the upper reaches, and the inner side of the connecting pipe as the lower reaches. And suppose sectionl-l' as basic level. We can get the quation u pI 822 P in the equation Z1=0pressure changes to be 5atm,if it is required that the gas flows in the tube at the same temperature , rate and mass velocity, what’s the inside diameter of the tube? Solution: Suppose the subscribe 1 as the state under 1atm and subscribe 2 as the state under 5atm. In the two cases ws1 = ws2 = ws T1 = T2 = T u1 = u2 = u because ws = u1A11 = u2A2 2 1 2 2 1 1 2 2 4 T P T p A d    = = so 2 1 2 2 1 1 2 ( ) p p d d = =   then mm p p d d 0.0313 5 1 0.07 2 1 2 = 1 = = 10. As shown in the figure, the feed liquid whose density is 850kg/m³ is sent into the tower from the elevated tank .The liquid level of the elevated tank keeps constant. The gauge pressure in the tower is 0.1kgf/cm²,and the feed rate is 5m³/h. The connected pipe is steel pipe(Φ382.5mm),the energy loss in the connected pipe of the feed liquid is 0.1kgf/cm²(the energy loss in the exit is not included).What is the distance between the liquid level of the elevated tank and the feed inlet? Solution: Suppose the liquid level of header tanker as the upper reaches, and the inner side of the connecting pipe as the lower reaches. And suppose section1-1’ as basic level. We can get the equation + + = + + +hf u p gZ u p gZ   2 2 2 2 1 2 1 1 2 2 in the equation Z1 = 0