a very short qustions , I really need help ( I need it clear ) : Q1 : in this ma

Question

a very short qustions , I really need help ( I need it clear ) :

Q1 : in this manometer problem , Why I can not use the bernoulli equation between point a and b ?

http://www.chegg.com/homework-help/applying-manometer-equations-33-manometer-used-measure-press-chapter-3-problem-61p-solution-9781118164297-exc

Q2 : can I use the bernoulli in the following problem?

https://www.chegg.com/homework-help/questions-and-answers/3-water-flows-steadily-shown-pipe-determine-difference-pressure-p-p2-b-head-loss-1-2-c-flo-q25868320

Q3 : explain all the situations that bernoulli equation cannot be used ?

Explanation / Answer

1. No you can't use Bernoulli equation because there is head loss between point a and point b.

2. No, same reason as above. Even in part b head loss is asked.

3. Bernoulli equation has lot of assumptions and it can be used in ideal situations only. Some of the assumptions are flow is steady, incompressible, viscous forces are negligible etc.

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