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how would is find the molar flow rate or mass flow rate of water when only...

how would is find the molar flow rate or mass flow rate of water when only pressure of inlet stream and outlet stream is given.

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Answer #1

By applying bernoulli equation and continuity equation

A1V1=A2V2

P + ½ρv2 + ρgy = constant

P = pressure

v = velocity

ρ = density of the fluid

g = gravity

y = height

Here some examples

The Venturi effect

Several factors determine the pressure drop that occurs in fluid flow applications including laminar versus turbulent flow, the flow velocity, kinematic viscosity and Reynolds number of the fluid, internal roughness of the inside of the pipe as well as its diameter, length and form factor. Orifice plates, Venturi tubes and nozzles simplify the situation. the flow is related to ΔP (P1-P2) by the equation:

q = cd π/4 D22 [2(P1 - P2) / ρ(1 - d4) ]1/2

Pitot tube

v1 = [2 (p2 - p1) / ρ] 1/2   

= [2 Δp / ρ] 1/2

There no direction reationship for pressure and mass flow rate but you can find using bernoulli

thankyou

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