Capillary 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
View all RRB JE ME Papers >
  1. Hagen - Poiseuille equation
  2. Stoke's Law
  3. Chezy equation
  4. Darcy - Weisbach equation

Answer (Detailed Solution Below)

Option 1 : Hagen - Poiseuille equation
Free
RRB ALP: (उड़ान) Mini Live Test
1 Users
40 Questions 40 Marks 32 Mins

Detailed Solution

Download Solution PDF

Explanation:

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.

\(\mu = \left( {\frac{\pi }{{128}}} \right)\frac{{{W_l}{h_f}{d^4}}}{{QL}}\)

Full Test 6 (1-58) IMAGES Q58

Latest RRB JE ME Updates

Last updated on Mar 27, 2025

-> The CBT II Examination is now scheduled for 22nd April 2025. 

-> The RRB JE Mechanical Notification 2024 was released for 1145 vacancies.

-> Candidates applying for the recruitment should have a Diploma or B.E/B.Tech degree in Mechanical Engineering or relevant streams.

-> The selection process of the JE Mechanical includes Computer-Based Test 1, Computer-Based Test 2, Document Verification, and Medical Examination.

-> The RRB JE Mechanical Salary for the selected candidates will be from Rs. 13,500 to Rs. 38,425.

Get Free Access Now
Hot Links: teen patti classic teen patti live teen patti bliss