Shubrajit Bhaumik

18 Questions 28 Answers 0 Followers

Questions related from Shubrajit Bhaumik

Does all mineral oil contains asphaltenes?

I had a mineral oil of 460cSt (containing sulphur and phosphorus), after addition of nanparticles (carbon nano tubes and graphene) the viscosity decreased significantly. literatures says that the...

17 August 2018 6,528 1 View

Which is more preferable mixed lubrication regime or boundary lubrication regime?

Case I : An experiment was conducted using some additives. The additives formed a protective layer on the steel surfaces which reduced the roughness and hence h/Ra increased. Case II: When the...

05 July 2016 1,922 6 View

How does Young's modulus,shear modulus,Poisson ratio of a nano wire/tube/particle influence the coefficient of friction?

Mechanical properties influencing coefficnet of friction.

22 June 2016 1,408 2 View

Can we get lower coefficient of friction with larger scar diameter in a Four Ball Test rig?

Two tests were carried out. One with a vegetable oil and the other with mineral oil. The mineral oil viscosity was almost twice than the vegetable oil. It was observed that the Coefficient of...

11 January 2016 8,317 6 View

Which phase of lubrication regime is experienced in a Four Ball Test rig?

As we pour the lubricant in the cup when the balls interact whether regime is boundary lubrication or in hydrodynamic lubrication

24 December 2015 8,461 10 View

I performed an experiment and the following were negative outputs in the response table. Why?

An L9 orthogonal DOE was performed using Minitab. The S/N in case of frictional force is negative.The response of the frictional force and rpm were negative. But in case of other output...

11 July 2015 6,797 5 View

In a friction test under lubricated condition, do the results always follow the Stribeck curve?

Two experiments were carried out: one with mineral oil and other with vegetable oil. In case of mineral oil the trend of Stribeck curve is followed but in vegetable oil it is opposite. Each test...

24 March 2015 7,203 25 View

While analyzing a pin-on-disc experiment using Taguchi analysis which type of problem has to be considered- static or dynamic?

A pin on disc experiment has been carried out acc to taguchi does. the response(outputs) are coefficient of friction , frictional force. In taguchi analysis , whether this experiment would be a...

22 March 2015 3,520 2 View

In pin on disk how are you calculating the total wear track distance?

Formula.

13 May 2014 4,127 10 View

When we add solid particles to a liquid what can we call them: emulsions or dispersions?

Addition of additives in lubricant is to be called what?

07 May 2014 6,169 9 View

What are the tribochemical reactions when ZnO based lubricants are present between steel plates?

ZnO based mineral oil lubricants + EN 24 steel.

07 May 2014 1,442 9 View

What is the main reason that nano particles get agglomerated?

Nano particles such as copper oxide, zinc oxide and carbon nano tubes.

24 March 2014 9,314 40 View

What is the reduced radius when we use flat faced cylindrical pins for a pin-on-disk experiment?

In hertzian models we have models for spherical -spherical and spherical-flat, but flat-flat surface is not shown.

14 December 2013 7,811 4 View

If we are having a circular flat surface pin for pin on disk then what can I consider the area of contact - circular or elliptical?

Please let me know

13 December 2013 10,010 4 View

Can pin on disk experiment be related with with boundary lubrication case?

04 December 2013 4,873 4 View

How can we do analysis of a composite in ANSYS eg. aluminium mixed with SiC?

The composite is not in laminar.

21 February 2013 4,335 1 View

How does the lubribricity of lamellar structured nano and macro additives additives related to the interlayer spacing?

additives used were graphite , graphene and multi wall carbon nano tubes in lubricant.

01 January 1970 6,796 2 View

How to decrease the NAS value of a oil? On what properies of the oil should we take into consideration?

I have received a sample whose NAS is 3. Our objective is to reduce the NAS value to 1.

01 January 1970 5,882 2 View