# [basic question]

 Register Blogs Members List Search Today's Posts Mark Forums Read

 March 12, 2002, 20:24 [basic question] #1 beginner Guest   Posts: n/a what is the Newtonian, and Non-Newtonian flow ?

 March 13, 2002, 04:36 Re: [basic question] #2 Jonas Larsson Guest   Posts: n/a In a Newtonian fluid the shear stress is proportional to the velocity gradient (Tau = mu * du/dx, where mu is the viscosity). Most normal fluids are Newtoninan (air, water, ...) In non-Newtonian flows this linear relation between stress and strain is not valid - for example, many paints become more "fluent" (less viscosity) under shear (when you paint) and then "stiffens" when the shear dissapears. Many polymer flows are also non-Newtonian, blood flows also. In non-Newtonian flows there is a non-linear relation between the stress and the strain (strain changes the viscosity) Non-Newtoninan flows are often difficult to simulate.

 March 13, 2002, 23:22 Re: [basic question] #3 mukhopadhyay Guest   Posts: n/a Jonas, I have a suggestion. We are to encourage beginners and also ensure that the right message goes. So, why not we suggest text books for such beginners in place of giving kind of brief answers (because of limited space availability, etc.). They will be really enlightened I do believe.

 March 14, 2002, 04:32 Re: [basic question] #4 Jonas Larsson Guest   Posts: n/a Sure, you're free to suggest a good book instead.

 March 14, 2002, 05:15 Re: [basic question] #5 mukhopadhyay Guest   Posts: n/a Boundary layer theory by H Schlichting and Transport phenomena by Bird, Stewart and Lightfoot

 Thread Tools Display Modes Linear Mode

 Posting Rules You may not post new threads You may not post replies You may not post attachments You may not edit your posts BB code is On Smilies are On [IMG] code is On HTML code is OffTrackbacks are On Pingbacks are On Refbacks are On Forum Rules

All times are GMT -4. The time now is 19:46.