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IndustryArena Forum > Mechanical Engineering > Mechanical Calculations/Engineering Design > Newtonian Pressure Drop vs Non-Newtonian Prssure Drop
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  1. #1
    Join Date
    Oct 2016
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    2

    Question Newtonian Pressure Drop vs Non-Newtonian Prssure Drop

    Hi,

    I did some experiments on Newtonian and non-Newtonian fluids measuring the pressure drop through a horizontal pipeline. The Newtonian two-phase flow was water+air and the non-Newtonian was (water+xanthan gum)+air.
    I prepared 2 samples (2 concentrations) of the xanthan gum solution 1g/1L (995 kg/m3) and 2g/1L (990 kg/m3). I am wondering if it is logical that the Newtonian pressure drop was bigger than the non-Newtonian one?! Also the 2g/1L sample should've been with a higher density comparing to the 1g/1L!

    Thanks

  2. #2
    Join Date
    Mar 2006
    Posts
    202

    Re: Newtonian Pressure Drop vs Non-Newtonian Prssure Drop

    How does the viscosity of the water+xanthan gum+air change with shear? Some non-Newtonian fluids, like blood, get thinner with shear. Others, like corn starch in water, get thicker.

    The flow rate will affect it also. Higher flow rate means higher shear. I suppose too you need to know if the mixture changes the friction against the tube wall.

  3. #3
    Join Date
    Oct 2016
    Posts
    2

    Re: Newtonian Pressure Drop vs Non-Newtonian Prssure Drop

    Quote Originally Posted by vegipete View Post
    How does the viscosity of the water+xanthan gum+air change with shear? Some non-Newtonian fluids, like blood, get thinner with shear. Others, like corn starch in water, get thicker.

    The flow rate will affect it also. Higher flow rate means higher shear. I suppose too you need to know if the mixture changes the friction against the tube wall.
    The xanthan gum solution gets less viscous as the shear stress increases so, when we increase the flow rates, the shear stress increases and it will result in a small pressure drop.

    Thanks

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