9.6 PRESSURE MEASUREMENTS IN MOVING

9.6 PRESSURE MEASUREMENTS IN MOVING FLUIDS
Pressure measurements in moving fluids warrant special consideration. Consider the flow over the bluff body shown in Figure 9.17. Assume that the upstream flow is uniform and steady with negligible losses. Along streamline A, the upstream flow moves with a velocity U1, such as at point 1. As the flow approaches point 2, it must slow down and finally stop at the front end of the body. Above streamline A, flow moves over the top of the bluff body, and below streamline A, flow moves under the body. Point 2 is known as the stagnation point and streamline A the stagnation streamline for this flow. Along streamline B, the velocity at point 3 is U3 and because the upstream flow is considered to be uniform it follows that U1=U3. As the flow along B approaches the body, it is deflected around the body. From the conservation of mass principles, U4 > U3. Application of conservation of energy between points 1 and 2 and between 3 and 4 yields

Results (English) 1:

9.6 pressure measurements in moving fluids
pressure measurements in moving fluids warrant special consideration. consider the flow over the bluff body shown in figure 9.17. assume that the upstream flow is uniform and steady with negligible losses. along streamline a, the upstream flow moves with a velocity u1, such as at point 1. as the flow approaches point 2,.the velocity at point 3 is u3 and because the upstream flow is considered to be uniform it follows that u1 = u3. as the flow along b approaches the body, it is deflected around the body. from the conservation of mass principles, u4> u3. application of conservation of energy between points 1 and 2 and between 3 and 4 yields
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Results (English) 3:

9.6 PRESSURE MEASUREMENTS IN MOVING FLUIDS
Pressure measurements warrant special consideration in moving fluids. Consider the flow over the bluff body shown in Figure 9.17. Assume upstream that the flow is uniform and steady with negligible losses. Along A streamline, the upstream flow moves with a velocity U 1, such as at point 1. As flow approaches the point 2,It must slow down and finally stop at the front end of the body. streamline Above A, flow moves over the top of the bluff body, and streamline A below, flow moves under the body. Point 2 is known as the stagnation point and the stagnation streamline streamline A for this flow, streamline Along B,The velocity at point 3 and 3 U is because the upstream flow is considered to be uniform it follows that 1 = U U 3. As B approaches the flow along the body, it is deflected around the body. From the conservation principles of mass, U U 4 > 3.Application of conservation of energy between points 1 and 2 and between 3 and 4 yields