• Welcome to Photrio!
    Registration is fast and free. Join today to unlock search, see fewer ads, and access all forum features.
    Click here to sign up

Stirring, mixing and homogenizing

Off-Center Questions...

Re prop pix:
What is the thing that looks like scotch tape on the beaker ?
Is it the same thing that is resting on the rod on top?

What is the Beaker size?
 
The thing that looks like scotch tape is scotch tape!

The rod is a stainless steel rod with clips for other experiments being conducted at the same time. The tape is holding the rod. The entire experiment and many more photos will be in the book.

PE
 
It is a 1 L heavyweight pyrex glass beaker with about 800 ml of water held at 20 deg C. Food dye was added to the water for visibility. The PEPA is custom built and the prop mixer is an off the shelf item. The Scotch tape was the wide version taken from a 3 pack. The tape had just been opened. The mixer is clamped to a standard heavy duty ring stand. Power leads go to the rear. The prop mixer is on the base of the ring stand on the right in the second photo. Both photos are digital images that were cropped to size for uploading and to remove extraneous material such as the pump which can be partially seen on the left of the photos. A sheet of white backing paper was used to block shelves and other equipment such as pH meters, test solutions, more beakers and a timer. That was just clutter that was not needed for this purpose.

Is that enough information Ray? I can look up the time and date stamp of the images if you wish.

PE
 
I couldn't see the vortex as you described them...
my screen is set dark for night viewing.

Maybe another look tomorrow morning....

One word did throw me...
Random... in "2 random cylinders"

What is random about the cylinders?

Did you mean "Rambo" ?



(hint for Rambo: cf. Japanese meaning and movie usage)
 
The explanation is shown graphically on another reference in the shrouded turbine thread, but basically the PEPA throws out a thin plane of mixed materials from above and below by centrifugal force. The ejected fluid, when it hits the edge of the beaker at a perpendicular can go up or down and then, reaching the top or bottom it curls around forming two cylindrical mix patters of random fully mixed materials. In doing so, it works in a much smoother method with higher energy transfer and at higher speeds for faster maxing.

According to my translation, you mean "ranbo" or violence!

PE
 

Faster Maxing?
Isn't that proprietary T-max technology ?

 
Last edited by a moderator:
Photo Engineer said:
According to my translation, you mean "ranbo" or violence!

PE
Click to expand...

Yes. Thanks for that good description of the PEPA mixer.
I am sure the pictures will look the way they are supposed to now.
They say a picture's worth a thousand words, but sometimes a few words go a long way to clarify pictures too. Thanks.

Ray
 
Ray Rogers said:
Faster Maxing?
Isn't that proprietary T-max technology ?

Click to expand...

This was described by Herb Wilgus in a paper in an engineering jorunal in the 70s. I am not a member, and so I cannot read the journal but this was also described in other articles and patents. There are 3 version in use at EK AFAIK. It is virtually essential that high speed mixing take place in order to make any modern emulsion, but it is not essential to making a T-Grain emulsion.

PE
 
You must log in or register to reply here.
Menu
Log in
Register