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The Islamic University of Gaza Civil Engineering Department Fluid Mechanics-Discussion Autumn Semester (2011-2012) Instructors: Dr. Younes Mogheir Dr. Mazen AbuAltayef T.A. Eng: Mohammed Abu Al-hatal Eng: Amal Qarot Name: ……………………………………..……..…………… ID: …………………………..…….. Homework (2)b solution Question 1- Find the pressure at A,B,C and D Soln. ) PA= (62.4)*(4+2) = 374 Ib/𝑓𝑡 2 PB= -(62.4)*(2) = -125 Ib/𝑓𝑡 2 PB=PC = -125 Ib/𝑓𝑡 2 PD = -125-(62.4)(4+2+2) = -624 Ib/𝑓𝑡 2 Fluid mechanics Home Work 2- For the open tank , with piezometer on the side containing two different immiscible liquids find a) the elevation of the liquid surface in piezometer A b) elevation of the liquid surface in piezometer B c) total pressure at the bottom of the tank . a) ألنه الضغط متساوي على المستوى األفقيtank فيA لنفس االرتفاع السائلpeizometer ببساطة سيرتفع فيA السائل م2 وهو المنسوب b) باالضافة الى الضغط الذيB م ناتج عن الضغط الذي يسببه السائل0.3 لمنسوبpeizometer سوف يرتفع فيB السائل المكافئء للضغطB لذلك أريد إيجاد االرتفاع من السائلB مختلف عن السائلA ولكن الحظ هنا أن السائلA يسببه السائل كما يليA الذي يسببه السائل P = 720*9.81*1.7 =12 KN/𝑚2 Equivalent depth of liquid B to the pressure 12 KN/𝑚2 = 12 /(2.36*9.81) = 0.519 m The liquid B depth is 0.3+0.519 = 0.819 m c) 𝑃𝑏𝑜𝑡𝑡𝑜𝑚 = 720*9.81*1.7+2360*9.81*0.3 = 18.9 KPa 2 Fluid mechanics Home Work 3- A monometer is attached to a tank containing three different fluids , what will be the difference in elevation of the mercury column in monometer (y) 30 + (820*9.81*3)+(1000*9.81*2)+(1000*9.81*1) = 13600*9.81*y Y= 0.627 m 4- A differential manometer is attached to a pipe , calculate the pressure different between point A and B 𝑦+4 PA – (9.1*62.4(y/12))-(13.6*62.4*(4/12))+(0.91*62.4( 12 ))=PB PA-PB = 264 Ib/𝑓𝑡 2 3