High density, Less-Volatile, High Heat capacity Fluid

In summary, the conversation discusses the properties of a desired liquid for a college student's project, which include high density, high temperature of vaporization, low volatility, and high specific heat capacity. The student is interested in using this liquid to absorb all types of radiation, and is looking for suggestions for a safe, low cost and available liquid. The conversation also touches on the idea of using a polished surface and multiple layers of thermal conductors and insulators to maximize the absorption of thermal radiations. The expert in the conversation suggests using cryogenic cooling with low boiling liquids or allowing the liquid to evaporate and venting the gas elsewhere to stabilize the rate of radiative heat loss. The expert also questions the purpose of absorbing all types of radiation
  • #1
rohit1994
5
0
hey :smile:
I am a college student and am looking for a liquid having the following properties at very low temperatures (probably around 100-150 K) -
1) Very high density
2) Very high temperature of vaporization
3) Less- Volatile
4) High specific heat capacity
 
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  • #2
Your terms “very”, “very”, “less” and “high” are all a bit open to interpretation.
Maybe if you told us the application you wanted it for we could make some suggestions of liquids that not only meet your requirements, but are safe, low cost and available.
 
  • #3
Here is a quick list of possibilities, derived from CRC handbook.
Code:
T melt °C   enthalpy kJ per mole 
-259.34       0.12          H2            Hydrogen
-219.66       0.51          F2            Fluorine
-218.79       0.44          O2            Oxygen
-210.0        0.71          N2            Nitrogen
-205.02       0.833         CO            Carbon monoxide
-187.63       3.50          C3H8          Propane
-185.34       3.96          C4H8          1-Butene
-185.24       3.003         C3H6          Propene
-183.60       0.704         CF4           Tetrafluoromethane
-182.79       2.72          C2H6          Ethane
-182.47       0.94          CH4           Methane
-177.6        2.8           C4H8          Methylcyclopropane
-169.15       3.35          C2H4          Ethylene
-168.43       5.36          C5H10         3-Methyl-1-butene
-165.12       5.94          C5H10         1-Pentene
-163.6        2.30          NO            Nitric oxide
-162.90       5.30          C6H14         3-Methylpentane
-159.77       5.15          C5H12         Isopentane
-159.4        4.54          C4H10         Isobutane
-158.2        5.55          C2ClF3        Chlorotrifluoroethene
-157.42       4.12          CHClF2        Chlorodifluoromethane
-155.2        4.06          CHF3          Trifluoromethane
-153.84       4.92          C2H3Cl        Chloroethene
-153.6        6.27          C6H14         2-Methylpentane
-151.36       7.11          C5H10         cis-2-Pentene
-148.2        6.12          C5H8          1,4-Pentadiene
-147.88       4.98          C2H6S         Ethanethiol
-147.70       0.477         C3F8          Perfluoropropane
-145.9        4.93          C5H8          2-Methyl-1,3-butadiene
-142.42       6.93          C6H12         Methylcyclopentane
-141.5        4.94          C2H6O         Dimethyl ether
-141.11       8.88          C6H12         cis-2-Hexene
-140.8        5.64          C5H8          cis-1,3-Pentadiene
-140.7        5.92          C4H8          Isobutene
-140.21       8.35          C5H10         trans-2-Pentene
-139.76       9.35          C6H12         1-Hexene
-139.54       5.12          C2H3Br        Bromoethene
-138.88       7.31          C4H8          cis-2-Butene
-138.8        4.73          COS           Carbon oxysulfide
-138.4        4.45          C2H5Cl        Chloroethane
-138.3        4.66          C4H10         Butane
-137.53       7.91          C5H10         2-Methyl-1-butene
-136.6        4.40          C3H4          Allene
-136.2        6.96          C4H6          1,2-Butadiene
-135.0        3.36          C5H8          Cyclopentene
-134.4        6.85          C7H16         3,3-Dimethylpentane
-133.72       7.60          C5H10         2-Methyl-2-butene
-131.15       7.72          C2F4          Tetrafluoroethene
-130.5        5.74          C3H8S         2-Propanethiol
-129.67       8.40          C5H12         Pentane
-129.1        7.66          C4F10         Perfluorobutane
-128.10       0.79          C6H14         2,3-Dimethylbutane
-127.78       5.74          CCl2O         Carbonyl chloride
-127.58       5.44          C3H6          Cyclopropane
-126.8        4.20          BF3           Boron trifluoride
-126.6        6.75          C7H14         Methylcyclohexane
-125.7        6.03          C4H6          1-Butyne
-125.45       8.38          C3F6O         Perfluoroacetone
 
  • #4
Well, i read about the concept of a black body...
So, i was trying to develop a system which would absorb all the radiations falling on it.

As a perfectly black body is nearly impossible.
So, what i am planning to do is to have a fluid withing a multiple layers of thermal conductors and insulators having highly polished surface from inside.
The fluid is suppose to be at a very low temperature somewhere around 100 k or so, so that it attracts all the heat. And all the other properties that i listed in my original post are going to facilitate in the absorption of thermal radiations.

I have attached a simple layout of the desired system...
kindly help me out with it...
 

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  • #5
Most of time, cryogenic cooling is done by low boiling liquids - they are allowed to evaporate but since they are cheap and safe, it is not a problem, it is a feature because latent heat stops them from warming.

High boiling liquids exist, like propane. But how do you want to keep them near their freezing point rather than allow them to warm to their boiling point?
 
  • #6
Well, that's where the trick lies.
i want the fluid to have high specific heat capacity so that it requires a large amount of energy to increase its temperature.
And the boiling point should also be high as if it starts evaporating then radiation heat transfer would become dominating which i don't want.
i know i am asking for a nearly ideal fluid, but there should atleast be something like this.
 
  • #7
There are many ways of absorbing energy.
But why do you need / want to do it ?
 
  • #8
Baluncore said:
There are many ways of absorbing energy.
But why do you need / want to do it ?


Well, i actually want a system which could absorb all the radiations almost immediately ...
say, in less than a few seconds...
and if you have a better idea then kindly let me know :)
 
  • #9
Your diagram of a liquid filled container shows multiple internal reflections. If the internal surface was not polished it would absorb energy sooner and so reduce reflected energy passing back out through the window.

It does not matter which way the shiny or the matt side of an insulating sheet faces, it insulates either way. It is still better to polish both sides.

If you want the liquid to absorb all energy then presumably you will monitor it's rising temperature. At some temperature it will evaporate. Thermal radiation from the liquid will increase as the temperature of the liquid increases.

If you want to absorb all radiation passing through the window then you may as well let it evaporate the liquid and vent the gas elsewhere, the temperature will then remain constant without need for high thermal capacity. That will stabilise the rate of radiative heat loss and make for simpler flux measurements.

A perfect thermal sink is a broadband transmission line or a pipe, not a cul de sac, reflector or lake.

Baluncore said:
But why do you need / want to do it ?
I asked not what you want, but why you want it.
 

1. What is a high density fluid?

A high density fluid is a substance that has a large mass per unit volume. This means that a higher amount of the substance can fit in a given space compared to a substance with a lower density.

2. What does it mean for a fluid to be less-volatile?

A fluid is considered less-volatile when it has a lower tendency to evaporate or turn into a gas. This can be due to a combination of factors, including lower vapor pressure and stronger intermolecular forces.

3. How does high heat capacity affect a fluid?

High heat capacity refers to a substance's ability to absorb and store heat without experiencing a significant increase in temperature. In the case of a fluid, this means that it can maintain a stable temperature even when exposed to external heat sources.

4. What are some common applications of high density, less-volatile, high heat capacity fluids?

These types of fluids are commonly used in industrial processes, such as refrigeration, cooling systems, and heat transfer applications. They are also used in medical devices, such as MRI machines, and in automotive and aerospace industries for thermal management.

5. How are these types of fluids different from other types of fluids?

High density, less-volatile, high heat capacity fluids have unique properties that make them ideal for specific applications. They tend to be more stable and have a higher boiling point compared to other fluids, making them suitable for use in high-temperature environments. They also have a higher specific heat capacity, meaning they can absorb and release more heat energy without experiencing a significant change in temperature.

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