센겔 앤 볼스 열역학 5th 솔루션5-1
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센겔 앤 볼스 열역학 5th 솔루션입니다.
목차
Chapter 5
MASS AND ENERGY ANALYSIS OF CONTROL VOLUMES
본문내용
Conservation of Mass
5-1C Mass, energy, momentum, and electric charge are conserved, and volume and entropy are not conserved during a process.
5-2C Mass flow rate is the amount of mass flowing through a cross-section per unit time whereas the volume flow rate is the amount of volume flowing through a cross-section per unit time.
5-3C The amount of mass or energy entering a control volume does not have to be equal to the amount of mass or energy leaving during an unsteady-flow process.
5-4C Flow through a control volume is steady when it involves no changes with time at any specified position.
5-5C No, a flow with the same volume flow rate at the inlet and the exit is not necessarily steady (unless the density is constant). To be steady, the mass flow rate through the device must remain constant.
5-6E A garden hose is used to fill a water bucket. The volume and mass flow rates of water, the filling time, and the discharge velocity are to be determined.
Assumptions 1 Water is an incompressible substance. 2 Flow through the hose is steady. 3 There is no waste of water by splashing.
Properties We take the density of water to be 62.4 lbm/ft3 (Table A-3E).
Analysis (a) The volume and mass flow rates of water are
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