Fluid Mechanics local acceleration and convective accelerationby yrael Tags: acceleration, convective, fluid, local, mechanics 

#1
Feb1008, 06:29 PM

P: 7

1. The problem statement, all variables and given/known data
The velocity of the water in the pipe is given by v1=.5t m/s and v2=1tm/s, where t is in seconds. Determine the local acceleration at points 1 and 2. Is the average convective acceleration between these two points negative, zero, or positive? 2. Relevant equations A figure of pipe (funnel like) that is larger at the input end with v1 and smaller end with out put speed of v2. 3. The attempt at a solution I don't really know how to start answering this question, I don't have the text with me (still in delivery) and don't have any notes thats on this topic. My try: d (v1)/dt=0.5t so a=d(v1)/dt=.5 m/s^2 d(v2)/dt=1t so a2=d(v2)/dt=1 m/s^2 



#2
Feb1108, 03:24 PM

HW Helper
P: 1,986

The local accn changes because the flow is not steady and time dependent, and the values are as you have derived.
The convective accn is positive because a particle of fluid has to speed up due to the area at point 2 being smaller than area at point 1. For a steady flow, there would be convective accn only. 


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