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Momentum balance derivation in equations 
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#1
Nov2112, 04:16 PM

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I'm a little confused, in my fluid mechanics course we've covered many equations and they are all derived using an xdirection fluid flow. If I was to use these in a system in which fluid flowed in the ydirection would I have to rederive them? Or would it be more of a case of using a horizontal system in a vertical direction?



#2
Nov2112, 05:46 PM

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Hi Fishinev! Welcome to PF!
In that case, if you want to apply the equations to a vertical system, you'll need extra (ρgh) terms to deal with gravity. 


#3
Nov2112, 06:25 PM

P: 5,462

If this is a liquids questions then a body force such as gravity may well come into play. Remember in chemical engineering other body forces are often also in play. 


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