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P4.1 An idealized velocity field is given by the formula
Is this flow field steady or unsteady? Is it two- or three-dimensional? At the point (x, y, z) = (?1, +1, 0), compute (a) the acceleration vector and (b) any unit vector normal to the acceleration. Solution: (a) The flow is unsteady beca
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- 등록일 2019.04.25
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5.1 For axial flow through a circular tube, the Reynolds number for transition to turbulence is approximately 2300 [see Eq. (6.2)], based upon the diameter and average velocity. If d = 5 cm and the fluid is kerosene at 20°C, find the volume flow rate in m3/h which causes transition.
Solution: For
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1.1 A gas at 20°C may be rarefied if it contains less than 1012 molecules per mm3. If Avogadro’s number is 6.023E23 molecules per mole, what air pressure does this represent? Solution: The mass of one molecule of air may be computed as
Then the density of air containing 1012 molecules per mm3 i
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- 페이지 64페이지
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- 등록일 2019.04.25
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P3.1 Discuss Newton’s second law (the linear momentum relation) in these three forms: ∑F=ma ∑F= d dt(mV) ∑F= d dt V ρ d υ system ∫ ? ? ? ? ? ? ? ?
Solution: These questions are just to get the students thinking about the basic laws of mechanics. They are valid and equivalent for constant-mass syst
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P7.1 An ideal gas, at 20°C and 1 atm, flows at 12 m/s past a thin flat plate. At a position 60 cm downstream of the leading edge, the boundary layer thickness is 5 mm. Which of the 13 gases in Table A.4 is this likely to be?
Solution: We are looking for the kinematic viscosity. For a gas at l
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- 페이지 89페이지
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- 파일종류 아크로벳(pdf)
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