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Questions tagged [cryogenics]

14 questions
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Looking for best material for a cryogenic ball mill cup and balls

I am working with a set of alloys that must first be ground up in a ball mill at cryogenic temperatures. It is important that no contamination makes it into the material and careful steps are taken to ensure this end. Unfortunately when we ran a…
eatscrayons
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Do liquid hydrogen-based cooling devices exist and what are they used for?

Liquid hydrogen cooling could be some intermediate solution between helium and liquid nitrogen based cooling. For example, some type of superconductors could be cooled by liquid H2, and this could be much cheaper than the liquid He. What are their…
peterh
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Can a Peltier's device (i.e.Thermoelectric cooler) achieve cryogenic temperature efficiently?

Does the stacking of peltiers device shows promising results in achieving the cryogenic temperature? I have tried doing the experiment, the overall temperature of the system increased around 80ºC and then the dissipation of that heat was the prime…
Adarsh Shubhananda
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Does a tank of liquid nitrogen increase in total internal energy after emptying?

Suppose there's a 10 liter perfectly-insulated sealed tank of saturated liquid nitrogen at 4 bar. Therefore the fluid has properties, $\rho=740 \,\frac{\text{kg}}{\text{m}^3}$, $m=7.4 \,\text{kg}$, $\hat{u}=-93\,\frac{\text{kJ}}{\text{kg}}$, and…
Victor
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Heat rate through composite wall with non-constant thermal conductivity

I just started a job working with cryogenics and I am trying to solve an interesting heat conduction problem that I was hoping someone could help me along with. I have a structure that spans from room temp (call it 300K) to 4K, and I want to…
Andre3
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How can we dissipate the heat from a block of 10*10*3 mm with 100 degree Celsius without losing the portability of the block?

I have a Peltier's device of 10*10*3mm and the material is Bismuth Telluride. The hot side is 100 $^oC$ and I want to dissipate the heat, and at the same time, the device should be portable i.e. it should not be part of the system so that I can't…
Adarsh Shubhananda
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Liquifying nitrogen using Joule–Thomson effect

I need equations to calculate these cryogenic problems: Generally how much energy (joules) is required to convert room temperature (21 °C) nitrogen gas into 1 liter LN2 using Joule–Thomson effect ? Is there a more energy-efficient way to do that…
wuka
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How can I develope a water loop cooler system sustaining with liquid nitrogen?

Water will be circulated in the water pipe and liquid nitrogen tanks heat going to cool the water pipe,by the way to the water too. And fan is going to blow this cold air and heat is going to be decreased. Is it possible ?
Deli Coban
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Polycarbonate as a short-term cryo-tank?

Can polycarbonate be used to store a cryogenic liquid for a short duration, let's say 15-20 minutes. I've heard that PVC will be really brittle at low temperatures. What I'm trying to do is a rocket and I need a tank to store my LOX. I need it to be…
Dat Ha
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Cheap epoxy for Liquid Nitrogen temperatures?

I have been testing acrylic in and out of a N2 bath. It is a very thick piece so it is holding up surprisingly well. I need to bond pieces of acrylic together for my application that will be submerged in N2. In your experience have you used or know…
Blacbeanburgr
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What tool (numerical/simulation) can help me with this problem on liquid/gaseous nitrogen in a cylinder?

I hope everyone's doing well. I was wondering what kind of tools (numerical/simulation, and perhaps the corresponding equations as well) can help me model this problem of liquid/gaseous nitrogen in a cylinder. I'm interested in finding out how the…
ca2n
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Do companies recover CO2 and water from the purification step of cryogenic air separation, and how?

In the 3rd step of cryogenic air separation, filtered air is purified to remove water, CO2, and hydrocarbons from the N2-O2-Ar stream. Im interested in knowing what happens with that CO2 and water. Can both resources be recovered in a useful form?…
dlight
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Which materials we can use for storing liquid nitrogen?

What are the materials we can use for the long-term storage of 30~liters of liquid nitrogen with composition and grade, along with the thickness of the sheet and storage capacity? Can we use any composites for the same? And which is the best among…
Vaibhav Gaur
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Rate of flow of liquid nitrogen from a static tank through an orifice in a submerged vessel

My background is in electronics, not mechanical engineering and fluid dynamics, so please keep that in mind. Also, this is not a homework or academic assignment. Q: A dewar is partially filled with liquid nitrogen (LN2) and is open to the…
Elflord
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