Viscosity Conversion

4 comments

Rate

Aussie Ray Member Join Date: Apr 2008 Posts: 7	Viscosity Conversion 08/20/2008 3:45 AM
	I wish to determine the viscosity of a mineral slurry in order to size a mixer. Unfortunately the only property that can be provided is the yield stress of the slurry taken with a vane viscometer. This yield stress is 200Pa. Please advise how I can convert this value into a centipoise valve to use in my calculations?
	Register to Reply

Interested in this topic? By joining CR4 you can "subscribe" to
this discussion and receive notification when new comments are added.

PWSlack Guru Join Date: Jan 2007 Location: In the bothy, 7 chains down the line from Dodman's Lane level crossing, in the nation formerly known as Great Britain. Kettle's on. Posts: 32175 Good Answers: 839	#1 Re: Viscosity Conversion 08/20/2008 5:26 AM
	The thing that is missing is the shear rate. Shear stress divided by shear rate is the viscosity. Viscosity divided by density is the kinematic viscosity, which has the dimensions of area squared divided by time. __________________ "Did you get my e-mail?" - "The biggest problem in communication is the illusion that it has taken place" - George Bernard Shaw, 1856
	Register to Reply

arsan50 Associate Join Date: May 2008 Posts: 26	#3 In reply to #1 Re: Viscosity Conversion 08/21/2008 1:43 AM
	Thanks, short but very valuable information. Regards Hasan
	Register to Reply

Anonymous Poster	#2 Re: Viscosity Conversion 08/21/2008 12:09 AM
	Sorry to add further to this problem, but mineral slurries are almost invariably shear thinning fluids. This means that you will need to get the full graph of viscosity vs shear rate. From this you can calculate the impeller power draw. Depending on the particular application you may also need to use cavern theory to size the mixer. Best advise is to send the slurry to a mixer manufacturer for them to test as if you are suspending solids there is a significant time effect. Reasonably large scale testing is your best bet for reliable results. You will also need to tell them solids size distribution. On a side note a Haake viscometer is probably the best bet for this type of slurry.
	Register to Reply

Kishore Kaikini Associate Join Date: Apr 2008 Posts: 34	#4 Re: Viscosity Conversion 08/21/2008 3:33 AM
	Dear Sir, In case you wish to convert the Viscous Slurry in to Dry Powder by machine support, I would need PHYSICAL Properties of Slurry such as Compoistion, Density, TDS, DSS, Moisture Content etc This is just a possibility that I could be of Support to you outside the scope of your Querry. Regards:Kishore
	Register to Reply Off Topic (Score 5)

Copy to Clipboard

Anonymous Poster (1); arsan50 (1); Kishore Kaikini (1); PWSlack (1)

You might be interested in: Rheometers, Spray Valves, Viscometers

	Got Something to Say?
	Ask a Question Start a Discussion

	Search this Forum
	Chemical & Material Science: Go

	Aerospace
	BioMech & BioMed
	Chemical & Material Science
	Civil Engineering
	Communications & Electronics
	Education and Engineering Careers
	Electrical Engineering
	General Discussion
	Instrumentation
	Manufacturing
	Mechanical Engineering
	New Technologies & Research
	Software & Programming
	Sustainable Engineering
	Transportation

	Site Directories
	Forum Directory Blog Directory User Group Directory RSS Feeds CR4 Rules of Conduct CR4 FAQ Site Glossary Who's Online (57 right now) Show Members