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...

07 August 2018 9,447 1 View

What can be the reason for high coefficient of friction and low wear scar in a lubricant containing carbon friction modifier and zinc oxide?

A lubricant contains zinc oxide nano particles and carbon FMs, the coefficiet of friction is high while the wear scar diameter is less for the samples. The load was 392N @1200rpm @75degree C.

03 April 2018 3,084 6 View

Does the coefficient of friction values depend on the type of tribometers used?

Experiments were carried out using pin on disc apparatus (120N, 800rpm, a flat faced pin 10mm, room temperature) and four ball test(120N,800rpm , AISI 52100 balls , 75 degree C). The lubricant...

11 December 2017 3,529 2 View

What is the Youngs Modulus of Zinc Oxide Nanoparticles?

Elastic modulus of Zinc Oxide nano particles

07 August 2017 7,994 2 View

How to explain the phenomenon of extreme pressure properties in case of graphene and carbon nano tube?

Graphene and carbon nano tubes shows better extreme pressure characteristics when used as additives.

06 July 2016 8,544 0 View

Can anyone tell me some applications where we use gears of hardness 22Rc-30Rc?

Specific Application please.

06 July 2016 3,358 2 View

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

06 July 2016 9,847 7 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.

05 June 2016 1,316 2 View

Which roughness parameter would be more suitable to compare between steel surfaces : average roughness,skewness or kurtosis?Why?

05 June 2016 3,356 3 View

Does graphene exhibits better frictional properties than carbon nano tubes?

Graphene shows better frictional properties than carbon nano tubes.

05 June 2016 2,558 1 View

What is the production process of CaFe ferroalloys?

I looking for ferro calcium production process

03 March 2021 1,755 4 View

12% ledeburitic cold work tool steel, etched for revealing retained austenite, any help for clarifying?

Hello everyone. Given microstructure image belongs to a 12% ledeburitic cold work tool steel (annealed and tempered). The sample was etched with picral (100 mL ethanol and 4 g picric acid). I...

02 March 2021 4,119 3 View

Why Austenite grains in steel show much more twinning than ferrite grains?

It is oftentimes said to be a distinctive metallographic trait that differentiates a fully austenitic and a fully felly ferritic steel without etching that might distinguish between two. Why...

02 March 2021 728 2 View

What are the countries most affected by extreme rainfall as a result of climate change?

Increased heat, drought and insect outbreaks, all associated to climate change, have increased wildfires. Decreasing water supplies, declined agricultural yields, health impacts in cities owing to...

01 March 2021 7,168 9 View

How Can I bring as much common elements in steel as possible to calculate stable phase(s) in OpenCalphad?

As I was tweaking step-by-step OpenCalphad6 Macros step1.ocm involving phase and thermal property calculation of a High-speed steel, I could not incorporate more than 6 elements in the steel...

01 March 2021 8,840 1 View

I need to accelerate corrosion in steel parts that are used in a salt-water environment. Is there a technique for doing so?

I have a structure that employs d-ring swiveling tie-downs that corrode during use and become "frozen". I have sample swivel assemblies that I wish to corrode to see if I can free them using one...

01 March 2021 3,739 3 View

What is recommended for solid domain in ANSYS FLUENT?

Should I mesh the solid domain ? or should I use wall thickness? or Shell conduction? for Heat Transfer between two fluids of a Heat Exchanger. what is recommended?

01 March 2021 9,785 3 View

Heat exchanger with liquid Nitrogen as coolant?

I want to cool Natural Gas from 195 Kelvin to 138 Klevin in a heat exchanger by using liquid nitrogen as the coolant medium. When entering the heat exchanger, the liquid nitrogen will have a...

01 March 2021 6,450 5 View

How can i resolve the "final solutuin is not converged" error in Comsol for my heat transfer simulation??

I have been trying to simulate heat transfer problem in Comsol 5.5 for long time but it always throw an error stating: "Failed to find a solution. Maximum number of Newton iterations...

28 February 2021 8,626 3 View

How the wettability of rock sample can be changed by ageing in pure hydrocarbon oils only?

I want to do wettability analysis of hydrocarbon oil (octane)/rock/surfactant solution system. but to do the analysis first I have to make rock surface oil-wet. Since hydrocarbon oil does not have...

27 February 2021 5,383 3 View