Cooling nozzle - convection power

In summary: This can be challenging to simulate in FEA software because it requires defining the nozzle position and its cooling power at each time step. This could potentially be achieved by using the feature meant for simulating moving heat sources, where the power of convective heat transfer can be calculated using the given equation and the surface temperature at the current nozzle location. This approach may be useful in situations where the cooling nozzle only affects small parts of the surface at different times, rather than the entire surface. In summary, using the feature for moving heat sources in FEA software may be a viable solution for modeling convective cooling with a moving cooling nozzle.
  • #1
FEAnalyst
342
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TL;DR Summary
Is it reasonable to calculate power of convective heat transfer ?
Hi,

when modeling convective cooling in FEA one needs to define film coefficient ##h## and ambient temperature ##T_{amb}##. The software calculates convective heat flux using this data and current surface temperature ##T_s##: $$q=h(T_{s}-T_{amb})$$ However, modeling of moving cooling nozzle may be problematic in FEA software. Some programs have special features meant for moving heat sources (torch/laser) where the user defines position of the tool at a given time and specifies its power. Would it make sense to use this feature for moving cooling nozzle, i.e. calculate the power of convective heat transfer using the above equation (it should be possible to determine surface temperature at the current nozzle location) and simple relation: ##P=q \cdot A## ?
 
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  • #2
What is a "moving cooling nozzle?"
 
  • #3
Chestermiller said:
What is a "moving cooling nozzle?"

I was thinking about manufacturing processes where cooling nozzle follows specified path. It’s not easy to simulate something like that in FEA software because normally convection is applied to whole surface. But cooling nozzle would affect only small parts of the surface, each part at different moment of time.
 
  • #4
FEAnalyst said:
I was thinking about manufacturing processes where cooling nozzle follows specified path. It’s not easy to simulate something like that in FEA software because normally convection is applied to whole surface. But cooling nozzle would affect only small parts of the surface, each part at different moment of time.
I'm unable to picture the geometry. Perhaps a sketch would help.
 
  • #5
I guess the nozzles would locally and temporarly disrupt any established convection flow if they move quickly on a horizontal plane.
With sufficient time after the nozzle goes by, the convection may reach balance again.
At the same time, the blowing action of the nozzle would temporarily energize the heat transfer along its path.
If the above is true, the evaluation of the whole situation should consider speed of movement and blowed area/total area rate.
 
  • #6

1. What is a cooling nozzle and how does it work?

A cooling nozzle is a device that is used to cool down a hot surface or object. It works by using convection power, which is the transfer of heat through the movement of a fluid. The nozzle is designed to direct a stream of cool fluid, such as air or water, over the surface to absorb the heat and carry it away.

2. What are the benefits of using a cooling nozzle?

There are several benefits to using a cooling nozzle. It can help prevent overheating and damage to equipment, improve performance and efficiency, and increase the lifespan of the object. It can also improve safety by reducing the risk of burns or fires caused by hot surfaces.

3. How do I choose the right cooling nozzle for my application?

The right cooling nozzle will depend on various factors such as the size and shape of the object, the temperature and type of fluid being used, and the desired cooling rate. It is important to consider these factors and consult with a professional to determine the best nozzle for your specific application.

4. Can a cooling nozzle be used for other purposes besides cooling?

Yes, a cooling nozzle can also be used for other purposes such as drying, cleaning, or humidifying. By adjusting the temperature and flow rate of the fluid, the nozzle can be used for different applications. However, it is important to make sure that the nozzle is designed and suitable for the intended use.

5. How can I maintain and prolong the lifespan of my cooling nozzle?

To maintain and prolong the lifespan of your cooling nozzle, it is important to regularly clean and inspect it for any damage or wear. It is also essential to use the nozzle according to its specifications and avoid exposing it to extreme temperatures or corrosive substances. If any issues arise, it is recommended to seek professional assistance for repairs or replacements.

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