Questions tagged [thermal-conductivity]
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How would a temperature profile in wall change if the rate of heat transfer increases
Given the system below, how would the temperature profile in the wall change if the heat transfer in Fluid II was very fast?
If the heat transfer in Fluid II is very fast, then the T-profile ...
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0answers
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Derive expression for average heat flux in heat exchanger
The single-tube heat exchanger is used to increase the temperature of fluid
I from $T_{b1}$ to $T_{b2}$. The heating oil (fluid II) used
for this task enters at temperature $T_{02}$ and leaves at
...
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0answers
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Simplifying temperature profile
I am given the temperature profile below and the two equations:
$$Q = (2\pi R_0)LU_0(T_{1\infty}-T_{2\infty})\tag1\label1$$
$$\frac{1}{U_0R_0} = \frac{1}{h_1R_0} +\frac{\ln(R_\mathrm a/R_0)}{k}+ ...
2
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1answer
70 views
Derive expression for heat flow from oil bath to metal sphere
A spherical ball of iron is put into a hot bath of oil. The iron ball is initially at a low temperature and heat transfer from the oil to the iron will increase the temperature of the iron ball.
...
1
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1answer
88 views
What emits the least light when hot?
What sudstance emits the least light or radiation when hot with the highest vapor pressure point in a vacuum?
https://space.stackexchange.com/questions/35486/shielding-capability-of-liquid-metals
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1answer
24 views
Temperature profile at steady state [closed]
Consider a solid wall consisting of three layers where the layers are of equal
thickness but made out of different materials: $\ce{Layer 1}$ is made out
of copper (high thermal conductivity), $\ce{...
3
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2answers
51 views
Determine heat flux from temperature profile
The heating
element and the insulator are of equal thickness L. Heat transfer in
the air film adjacent to the heater is assumed negligible.
I've noticed that I find these type of problem the ...
-3
votes
2answers
180 views
Pre-Hydrogen Feature On the Output Of a Gas Chromatography Thermal Conductivity Detector
A candidate for "dark matter", predicted and now apparently detected to have both a higher thermal conductivity and higher diffusion rate than H2 is purported in this PowerPoint Presentation file. ...
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2answers
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Heat transfer through layered wall
An electrical heater is placed between two layers of insulation. The three layers (the heater and the two layers of insulation) have the same thickness. The figure below shows different temperature ...
3
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1answer
50 views
Equation for overall heat transfer coefficient
The heat flow (in $[\pu{J/s}]$) through the wall of a tube of length $L$ and inner radius $R_0$ is
$$Q = (2πR_0L)U(T_{1\infty} - T_{2\infty}),$$
where $T_{1\infty}$ is the bulk temperature ...
0
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1answer
657 views
Graphite: Thermal and electrical conductivity
I recently encounter this question:
Compare, while providing an explanation, the thermal and electrical conductivity of graphite to that of diamond.
Provided answer:
Graphite conducts electricity(...
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1answer
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Why would a ~1 cm thick layer of argon be a significantly poorer conductor of heat than air?
In yesterday's new Periodic Video, Argon (new) - Periodic Table of Videos, after about 07 min 00 sec, Sir Martyn Poliakoff says:
The final, and I have to admit perhaps slightly boring application ...
