Question
Download Solution PDFCapillary tube viscometers used for measurement of viscosity are based on -
This question was previously asked in
RRB JE CBT 2 ME 19 Sep 2019 Shift 2 Official Paper
Answer (Detailed Solution Below)
Option 1 : Hagen - Poiseuille equation
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Detailed Solution
Download Solution PDFExplanation:
Capillary Tube Viscometer:
- Viscometer is an instrument used for measuring the viscosity of a fluid. In the capillary tube viscometer, the pressure needed to force the fluid to flow at a specified rate through a narrow tube is measured.
- This type of viscometer is based on laminar flow through a circular pipe.
- It has a circular tube attached horizontally to a vessel filled with a liquid whose viscosity has to be measured. Suitable head (hf ) is provided to the liquid so that it can flow freely through the capillary tube of certain length (L) into a collection tank as shown in figure.
- The flow rate (Q) of the liquid having specific weight wl can be measured through the volume flow rate in the tank.
- The Hagen-Poiseuille equation for laminar flow can be applied to calculate the viscosity (µ) of the liquid.
\(\mu = \left( {\frac{\pi }{{128}}} \right)\frac{{{W_l}{h_f}{d^4}}}{{QL}}\)
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