Conduction and convection- processes understanding

[Sahil Dev]

Hi,

I shall be grateful if someone can throw light on the heat transfer processes taking place through in this very simple example.

Consider the attached image (pdf). See figure (c) which I have also marked in red block. It is pot lying on a hot plate.

I want to know the heat transfer processes taking place in this mechanism.

1) Firstly, the vessel is heated through the hot plate
2) Heat travels from the hot place to the bottom of the vessel
3) IS this process conduction that is taking place between the hot plate and the bottom of the vessel ?
4) Then the heat travels from the bottom of the vessel to the fluid (Assuming the vessel is filled with fluid). IS this process natural convection as the fluid rises up by buoyancy?

Are all my points 1,2,3,4 correct?

Thanks

 

[berkeman]

Hi,

I shall be grateful if someone can throw light on the heat transfer processes taking place through in this very simple example.

Consider the attached image (pdf). See figure (c) which I have also marked in red block. It is pot lying on a hot plate.

I want to know the heat transfer processes taking place in this mechanism.

1) Firstly, the vessel is heated through the hot plate
2) Heat travels from the hot place to the bottom of the vessel
3) IS this process conduction that is taking place between the hot plate and the bottom of the vessel ?
4) Then the heat travels from the bottom of the vessel to the fluid (Assuming the vessel is filled with fluid). IS this process natural convection as the fluid rises up by buoyancy?

Are all my points 1,2,3,4 correct?

Thanks

This is very similar to your previous thread(s). Are these questions for schoolwork?

 

[Sahil Dev]

No.

I'm doing a self study course on heat transfer as I need it for a purpose/

The previous threads were on radiation and then thermal resistance.

The above questions weren't there.

 

[berkeman]

No.

I'm doing a self study course on heat transfer as I need it for a purpose/

The previous threads were on radiation and then thermal resistance.

The above questions weren't there.

Even self-study work should go in the Homework Help forums. I will move this there and reply...

 

[berkeman]

1) Firstly, the vessel is heated through the hot plate
2) Heat travels from the hot place to the bottom of the vessel
3) IS this process conduction that is taking place between the hot plate and the bottom of the vessel ?
4) Then the heat travels from the bottom of the vessel to the fluid (Assuming the vessel is filled with fluid). IS this process natural convection as the fluid rises up by buoyancy?

-1- Yes
-2- Yes
-3- Yes
-4- Sort of. The heat is conducted to the liquid at the bottom (and sides) of the vessel, and then "advection" is the process that moves heat through the liquid (I believe). Then also convection is the process that transfers heat from the liquid to the air at the surface of the liquid.

Please have a look at the wikipedia page for more details and a more precise description: http://en.wikipedia.org/wiki/Heat_transfer