###
Simple U - tube Manometer

Home ->
Lecture Notes
->
Fluid Mechanics -> Unit-I

Equating the pressure at the level XX'(pressure at the same level in a continuous body of fluid is equal),

For the left hand side:

P_{x} = P_{1} + rg(a+h)

For the right hand side:

P_{x'} = P_{2} + rga + r_{m}gh

Since P_{x }= P_{x'}

P_{1} + rg(a+h) = P_{2} + rga + r_{m}gh

P_{1} - P_{2} = r_{m}gh - rgh

i.e. P_{1} - P_{2} = (r_{m }- r)gh.

The maximum value of P_{1} - P_{2} is limited by the height of the manometer. To measure larger pressure differences we can choose a manometer with heigher density, and to measure smaller pressure differences with accuracy we can choose a manometer fluid which is having a density closer to the fluid density.

Table of Contents

HOME

Last Modified on: 14-Sep-2014

Chemical Engineering Learning Resources - msubbu

e-mail: msubbu.in[AT]gmail.com

Web: http://www.msubbu.in