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Key to ME 111_S08 Exam2

# Key to ME 111_S08 Exam2 - ME111 Spring 2008 Exam#2 Key to...

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ME111: Spring 2008 Exam #2 1 Key to Examination #2 ME111 – FLUID MECHANICS Spring 2008 – Section 01

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ME111: Spring 2008 Exam #2 2 1. Define a steady flow field in the Eulerian reference frame. In such a steady flow, is it possible for a fluid particle to experience a nonzero acceleration? Explain. Yes, the fluid particle can experience a nonzero acceleration. By definition, a steady-flow process is defined as a process during which a fluid flows through a control volume steadily. That is, the fluid properties can change from location to location within the control volume, but at any location, they remain constant during the entire process. ( ) V V V V + = = . t dt d on Accelerati The first term on the right-hand side, called local acceleration, is zero for steady flow. The second term, called the advective (or convective) acceleration, can be nonzero even for steady flow. It accounts for the effect of the fluid particle moving to a new location in the flow, where the velocity field is different. 2. Consider the following steady, two-dimensional velocity field: V = (0.5 + 1.2 x ) i + ( 2.0 1.2 y ) j Is there a stagnation point in this flow field? If so, specify its x and y coordinates. A stagnation point is defined as a point in the flow field where the velocity is identically zero. Since velocity V is a vector, all of its components must be equal to zero in order for
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Key to ME 111_S08 Exam2 - ME111 Spring 2008 Exam#2 Key to...

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