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2C40.u1a - Laminar Motion - Beaker Size

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​2C40.u1a - Laminar Motion - Beaker Size

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Title2C40.u1a - Laminar Motion - Beaker Size
Objective

A line of dye in glycerin is slowly rotated into a sheet then back into a line.  The viscosity of the glycerin is high enough that the motion is laminar and the apparent mixing of dye and fluid is reversible.​

StatusAvailable
Assembly Instructions

Overview:  Two cameras can be used with good results, one from the side and the other from the top to see the spiral nature of the 'winding'.  It is important to provide a backing plate for best viewing of the apparatus with a camera.

Instructions:  The demonstration uses two concentric Plexiglas cylinders. The inner cylinder is solid and can be rotated on its vertical axis. The space between the cylinders is filled with glycerin. Using a syringe, the dark blue ink is released into the cylinder forming a vertical line. The ink should be as close as possible to the inner cylinder.  As the apparatus is small, use the video camera for class viewing.

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Setup Time5
Operation Time5
Preview Time5
Operation Instructions

Instructions:  If the line of dye is not already released into the cylinder, first take the syringe and squeeze some of the dark blue ink into the cylinder forming a vertical line.  Spin the inner cylinder slowly, which will move the line of ink into a winding sheet. Reverse the spin direction and the sheet returns to a line.  The viscosity of the glycerin is high enough that the motion is laminar and the apparent mixing of dye and fluid is reversible. ​

ExportableNo
Demo on DimeNo
PIRA 200No
Export Instructions (if different)
HazardsNone
Analysis/Information
Category2 Fluid Mechanics
Subcategory2C - Dynamics of Fluids
KeywordsLaminar motion, glycerin
Construction Information
 
Equipment TitleUse SHIFT+ENTER to open the menu (new window).
  
QuantityUse SHIFT+ENTER to open the menu (new window).
  
laminar motion jar - beaker with laminar central rotational post
1
glycerin
ink injector
1
camera - b&w
1
dye - blue