Questions tagged [heat-conduction]

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3answers
6k views

Why does a lot of water vapour come suddenly after the heat source of boiling water is removed? [duplicate]

I have noticed this several times. When I am boiling water, a few seconds before its boiling point, vapours are formed as usual. But if I turn the gas off before boiling, the moment it turns off, I ...
2
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2answers
195 views

More efficient way to heat liquids

If we consider two processes to heat up a bucket of water as follows:- Taking one bucket and heating it to our desired temperature for V volume. Taking two buckets of half the volume and heating one ...
2
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2answers
1k views

What is temperature as a function of time in Fourier's Law?

Can we find temperature as a function of time using Fourier's Law of thermal conduction? For example: If we have two square parallel plates of a given length, width, and distance apart with one ...
0
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2answers
1k views

Temperature at different points in a metal rod during heat conduction

$$ k = \frac{\frac{Q}{t}}{A(\frac{T_1 - T_2}{L})} $$ where k is thermal conductivity of the solid, Q is total amount of heat transferred, t is time taken for the heat transfer, A is area of the cross ...
2
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3answers
118 views

Focusing Sunlight with Flat Mirrors- solar barbecue

Say somebody had 48 1sqft glass mirrors (almost 4.5 sq.m total), because these tiles cost about $1 each. If mirrors are all tediously aligned to redirect sunlight onto a Weber BBQ, the air temp inside ...
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0answers
19 views

Behaviour of photons in different materials

Often when learning about heat transfer within metals and thermal conductors,the heat transfer is explained by saying how molecules vibrate in thier positions to conduct heat. But if that's the case ...
2
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1answer
100 views

Is the randomized motion of particles produce heat?

In the show on factomania from gregg foot I've heard that when sun light comes then some gas particles of air get more energy and velocity and as the average kinetic energy of molecules is Temperature ...
0
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1answer
571 views

Calculating rate of heat loss through conduction and radiation

Calculate the rate at which a hollow cylinder with a heating element inside will lose heat, specifically through both conduction and radiation. My goal is to find the temperature inside this cylinder....
0
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1answer
64 views

Effect of pressure when drying wet clothes in a windy environment

When we hang wet clothes outside, they dry faster if it is windy. The wind causes forced convection and removes the air saturated with vapor, and the rate of evaporation does not decrease much in ...
2
votes
1answer
92 views

What causes burns when in contact with hot water?

As I understand it thermal energy (heat) is simply a measure of the kinetic energy of an object (For example : water).Hot water is simply water with a larger kinetic energy in its molecules, right ? ...
2
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3answers
418 views

In an adiabatic process, why is it that if work is done very quickly then there is no time for energy transfer to the surrounding?

I don't seem to understand the logic in adiabatic process of how 'if work is done on the system very quickly e.g. compress a piston containing n number of gas particles, there is no time for energy to ...
0
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1answer
826 views

Temperature of solids and “average translational kinetic energy”

Temperature is related to the random motion of atoms and molecules in a substance. More, specifically, temperature is proportional to the average "translational" kinetic energy of molecular motion. ...
1
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0answers
21 views

Thermic isolation for 3D printer buildplate

I have questions about heat conduction, directly related to a problem I have with my 3D printer. Here is (schematic) front view of my 3D printer buildplate: The orange top plate is a PCB heated bed (...
0
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1answer
567 views

How do I convert $W/(mK)$, $W/m^2$ and $W/(m^2K)$ to the same “dimensionality” and unit?

How do I convert $W/(mK)$, $W/m^2$ and $W/(m^2K)$ to the same "dimensionality" and unit? $W/(mK)$ is thermal conductivity. $W/m^2$ is heat flow density related to one unit. $W/(m^2K)$ is the ...
1
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0answers
43 views

Heat loss due to thermal penetration [closed]

I am doing an experiment on a regenerator (Period 120 s). I found the thermal penetration depth through the insulation as 13 mm. I'm not sure how to estimate this heat loss?. I tried to estimate by ...
2
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0answers
123 views

What is the physical limit of thermal insulation?

If we consider a container (at very low) temperature $T_0$ surrounded by some passive structure, in turn surrounded by an environment at temperature $T_1>T_0$, there will be an inward heat flow ...
4
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3answers
4k views

If steam and water, both at 100 °C, were exposed to a person's skin for a small time interval, which would result in a more severe burn?

Imagine that you had two boxes with of steam and water of equal mass, both at $100~^\circ\rm C$, and you decide to expose your left land to the steam and your right to the water for a short period of ...

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