Probe Placement and Bean Mass Question

[SusanJoM]

Does anyone have a clear understanding (and maybe a graphic) of how the beans move in the drum when it is turning?

I've been looking at the pictures
https://www.hukyforum.com/index.php?action=gallery;sa=view;pic=37

Until now I have envisioned the beans being pushed towards the outside of the drum.  Now I wonder if they don't get carried upwards and then dropped down through the middle?   Why does it matter?
Probably it doesn't, but I can't help but think that changes their 'real' relationship (if not their graphed relationship).

Seems from the picture that BT is not likely IN the bean mass if the drum is not turning, right?  Unless of course the drum is packed solid? 

[brew]

Looks to me that some beans get thrown to the back but ultimately get thrown to the front.

[SusanJoM]

Excellent picture.
And an even more reasonable scenario.
Thanks.

Brew, can we upload that picture into our Gallery?

[SusanJoM]

I asked Mr Li the following question:
I've been looking at the thermocouple placement, and it seems as if BT is towards the center of the drum itself, and ET is towards the inside of the wall itself.  Correct?  So, how full does the drum have to be for beans to be in the bean mass when the drum is at rest.  What about when the drum is turning?  And does the rotation of the drum press to beans to the outside or do those fins make them drop down through the center?

To which he responded with the following two pictures

[korkiley]

Thank you for obtaining these images. It's very helpful to see the relationship of the probes and the exhaust tube!

[brew]

Excellent picture.
And an even more reasonable scenario.
Thanks.

Brew, can we upload that picture into our Gallery?

I linked to it when I posted and it isn't my image

[beananimal]

Some time ago I tried to visualize the level of beans in the drum to understand the position of the thermocouple and if it is measuring the bean mass temperature or more a mixture of beans and air flow temp.
It should be 333g and 400g of beans. I rotated the drum by hand carefully until the beans rolled down. The faster the drum turns the more beans climb up on the left side.

For me it was good enough to decide that 333g is ok for the position for the BT. (I bent it done anyway)

[beananimal]

That is the picture we know very well: (Just the chrome is missing)



And that is what is behind the wall:







Behind the probes and the trier there is not very much space.
If you push them in a little bit further, then they hit the the "3-arm" in the middle of the drum

[SusanJoM]

So, what is the minimum charge weight that keeps the BT thermocouple in the bean mass, or that keeps it in at the most consistent percent of the turning time ?

Edit:  Oops, sorry.  I just read back to the beginning and see that you already stated that.

[beananimal]

I did already a set of videos with 100, 150, 250, 330, 400g, 500g, but I have to redo them again, because the quality is quite bad due to a lot of disturbing light effects.

This is the  Huky when it is full:


330g, which is my typical batch size


Some impressions of the setup:




I filled in step-by-step. Unloading is still a little bit slow. 



And here the most most negative "surprize". Starting at 400g, some beans start jumping into the exhaust and rest there. Even without the fan running!



The elbow has the original dimensions, but the inlay plate is not yet installed.
There will be a more transparent elbow next time.
It is part of the learning curve 

One question: For the videos, how to implement them?
I assume I have to create a youtube account?

[SusanJoM]

Do I see this right? 
Did you make yourself a clear replica of the front plate of the HUKY? 
If that's what it is, it's fabulous and I want to know more about it.

[edtbjon]

Do I see this right? 
Did you make yourself a clear replica of the front plate of the HUKY? 
If that's what it is, it's fabulous and I want to know more about it.

I had some conversations with Peter, as he bought a T conversion kit from me. There's even more nice tidbits on a german forum, but I'll let Peter tell all of you all about that.
BTW, Susan, how does one post a video? (The 1Mb max size for the forum makes me think like Peter, i.e. a YouTube account and a link to the YouTube video...) Anyhow, I know that we all want to see the videos!

[SusanJoM]

How does one post a video? The 1Mb max size for the forum makes me think like Peter, i.e. a YouTube account and a link to the YouTube video...)

That should work.

[beananimal]

Do I see this right? 
Did you make yourself a clear replica of the front plate of the HUKY? 
If that's what it is, it's fabulous and I want to know more about it.

Yes, It's a Plexiglas version, with all the holes for axis, probe, bean-trier, analog gauge, as you can see on the "night view" pictures. Unfortunately the transparent foil, which shall prevent from scratches, ruins the nice clear view from the plain plexiglas.

So for the next weekend(s) I plan several tasks:
- Proper preparation of the foil to gain a clear view
- Changing the light concept and get the light "inside" avoiding the reflexions
- To test,  how to upload the videos

If the foil remains so disturbing, I'll remove it when I am sure that I can create proper videos in the next run.

Generally it was surprizing to see, that inside the Huky the beans are not only in rotation, but that the heap is much higher at the front than at the rear side. If you change direction of rotation, this changes as well.

The flow at the glas front may change for large batches if the bean trier is installed, because the bean trier, the axis and the probe build quite some hindrance for the beans falling down from left top side.

[beananimal]

Now I can present the first video and hope you can see:
The light conditions are very difficult and I varied it, so that sometimes the view inside the Huky is possible and in other moments the view onto the front is clear.
In the exhaust there is a torch.
I hope you can see the video.

https://youtu.be/TOa-1hUAYBk


And here the overview on the setup: