Teachable Moment Pop-Quiz #3

[Outta Control]

Okay one more before I rebuild my other drone.

The Apparent temperature of the heating element is near 356F, why is the conduction of heat seen slow.

Explain your observations.

 

[ArrUnTuS]

The base of the basin has not yet started to transmit heat? or is the rest of the casserole made of a more heat-resistant material?

These are exam questions, aren't they?

 

[jack.s]

I would think the dish was designed to transfer heat to the contents. Also seems the upper part of the dish is similar temperature to back panel of the stove, so I wonder if the time the heat element has been on is not very long.
Just wondering why the lid is black? Is that reflection or is it much cooler as the lower number 60.8 would indicate.
Maybe it just came out of the fridge.

 

[Outta Control]

The base of the basin has not yet started to transmit heat? or is the rest of the casserole made of a more heat-resistant material?

These are exam questions, aren't they?

You are half way there but need to complete it.

I would think the dish was designed to transfer heat to the contents. Also seems the upper part of the dish is similar temperature to back panel of the stove, so I wonder if the time the heat element has been on is not very long.
Just wondering why the lid is black? Is that reflection or is it much cooler as the lower number 60.8 would indicate.
Maybe it just came out of the fridge.

Great observation but you and ArrUnTus is so close!

Here is a hint...cast iron.

Over all good job fellas. Let's run this a little longer.

 

[ArrUnTuS]

Outside, the cast iron does not allow the sensor to detect heat?

 

[Outta Control]

Ok being that it is a cast iron cookware you need to think about the material itself. *hint hint*

 

[ArrUnTuS]

Here I get lost, the iron is able to transmit the heat quite well, the cast iron still has some characteristic that encloses the heat inside it helping to save energy (in this case). I don't know

 

[Outta Control]

LOL. No worries my friend. You had the right idea.

Cast iron is a very dense material, thus why it can retain heat evenly.

So if you ever cooked with a cast iron cookware, you should note that cast iron pans and cookware take a bit longer to bring it up to temperature unlike aluminum or steel pans.

Which means cast iron material take a longer to do Conductive heating, which is evident to the cookware slowly heating near the bottom at a high temperature heating element.

As for the lid, I placed a minute before I took the thermal photo.

 

[ArrUnTuS]

To make a good study I understand that it is necessary to have at least also an RGB image to be able to determine this kind of things. I mean, you also have to take into account the material of the objects under study.

 

[Outta Control]

If you look closely even the convected heat from the heating element does affect the cast iron sides.

 

[jack.s]

So is this emissivity? Knowing the material and it's ....heat reflectance ( for lack of knowing the right term)

 

[Outta Control]

Well emissivity is the ratio of a the actual amount of electromagnetic energy emitted by an object to the amount emitted by an ideal blackbody at the same temperature.

So basically when we talk about Emissivity it about measuring for Absolute temperature.

This was an exercise of a Qualitative analysis but knowing the material and how it is manufactured (Enamel) will affect it's ability to both absorb and/or reflective.

 

[jack.s]

Thanks again,
Ok, so is it a fair statement to say
-different materials will reflect the same amount of heat differently.
-Then using thermal imaging we would need to know the materials and what the ratio is, to analyse correctly.
If not emissivity what do we call this ?

 

[Outta Control]

We would call it Conduction.

ie. "...Based on my background, knowledge, and experience, the conductivity of the cast iron show a slow but gradual transfer of heat energy signified by the lower portion of the cookware. This could be attributed to the material ability to resist conduct based on Fourier's Law of heat conduction."

Now I'll send the Invoice to who?

 

[jack.s]

Ok ok I might have gotten into a bit much.
See, your doin such a good job gettin people involved.
Thanks
I have a number of relatives around Mountain View so next time I'm there I'll pay that invoice if I can beer you.

 

[Outta Control]

You are always welcome to ping me buddy.

 

[Norm Kokes]

It appears the pot is suspended on a grate so it is not in direct contact with the stove element.

 

[Avocet]

Looks to be a Corning type (glass) cook top. I recognize the LED readout on the panel! RGB would confirm.