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FE Exam Fluid Mechanics - 3.4 - Practice Problem - Continuity and Impulse-Momentum Principle 

College Fluid Mechanics
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In this segment, we solve an FE practice problem from the continuity equation (conservation of mass) and the Impulse-Momentum Principle (conservation of momentum) topics of the Fluid Mechanics FE Exam. These topics are tested on FE Mechanical, FE Civil, FE Environmental, FE Chemical, and FE Other Disciplines.
We often refer to the reference manual, which is freely available after creating an account with the NCEES at: ncees.org/supp....
Disclaimer: This is a practice problem created by us and not an actual FE exam question. This material is based upon work supported by the National Science Foundation under Grant No. 2019664. Any opinions, findings, and conclusions, or recommendations expressed in this material are those of the author and do not necessarily reflect the views of the National Science Foundation.

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13 окт 2024

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Комментарии : 6   
@bishalpokharel5360
@bishalpokharel5360 2 года назад
Why did you negleted P1A1? Coz they are negligible when exposed to atmosphere?
@carultch
@carultch Год назад
P1*A1 is a force that is resisted by the constraint that holds the nozzle in place, which is out of the picture of the question asked. We are interested in the force that holds the impinged plate in place.
@josea.serrano-perez3544
@josea.serrano-perez3544 2 года назад
Is it ok to use here the equation for jet propulsion, it would be the same Fx = Qp(V2), why not use this directly?
@CollegeFluidMechanics
@CollegeFluidMechanics 2 года назад
As long as you are careful about the inherent assumptions for the jet propulsion equation (pressure forces are negligible is one one assumption), you sure can use it.
@Keko881000
@Keko881000 2 года назад
Can this problem be solved by applying conservation of Energy between two points ( Discharge and Impact) Points, Then F = PA ??
@CollegeFluidMechanics
@CollegeFluidMechanics 2 года назад
Good question: unfortunately, that will not work. You can not multiple static pressure with cross sectional area to find the force exerted by a flow (due to the existence of fluid momentum). You can use that formula for static cases safely, though
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