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1、Chap 5Newtons second law of motion Control-volume approachUnit Operation & Transfer PhenomenaLinear momentumStream lineBoundary of system At time tBoundary of system At time t+tIIIIII單位換算要除gcThe time rate of change of momentum of a system = The force act on the systemNewtons Second Law of MotionnThe
2、 time rate of change of momentum of a system = The force act on the system momentum efflux through the control volumenvdAStream lineExamp-1 Application of Linear momentumV1V2P1WWP2PWPwExamp-1 Application of Linear momentumV1V2PWWFxFyprob-5-13單元操作V21vm22V1 = 01x1A=1x2單元操作1單位質量所含之 內能+位能+動能=常數P1aSy+yy
3、v2v1bP2A1A2 =A 1+AP=PProb.5-14 柏奴利方程式AA+ A PrExamp-2hv0hv0yxFx移動座標v0scoopExamp-2hv0hv0yxFx固定座標Prob 5-7Oil 比重0.8 流量Q=3ft3/s 求管件對流體作用力Fx50psig D=125psig D=2.51 2Prob 5-7Oil 比重0.8 流量Q=0.1m3/s 求管件對流體作用力Fx5000KPa D=3500KPa D=11 2Prob 5-8water 流量Q=400gal/min 求管件對流體作用力Fx單位換算要除gcProb 5-9Aj=0.06ft2vj =90ft/svs=10ft/sv2= ? ft/sA=0.6ft2Turbine & Pump PumpTurbineMoment of momentumrmvpelton wheel Turbinenpelton wheel帕爾登水機屬衝擊式 (impulse turbine) ，應用於高差 (200-2000m)、低的水. 發電廠Radial-Flow Turbine向量內積AB向量外積AB垂直於平面 之單位向量
