Thermal Radiation from a Liquid or Gas

In summary, the conversation discusses the difficulty in calculating heat loss from gas or liquid at different temperatures, with the understanding that it is not a simple blackbody problem. The speakers are looking for papers or texts that address this issue and inquire about potential solutions. They also mention that other processes such as conduction and convection can complicate the calculation.
  • #1
radiatorguy
2
0
Hello,

I've been trying to find out how to calculate heat loss from a gas or liquid vs. temp. My understanding is that this is not a simple blackbody problem for a variety of reasons... guess it's more a gray-body problem. Have not been successful at finding papers or texts which deal with this specific issue. Are there simple ways to get approximate solutions to this problem or is this much simpler than I realize. Any insights or leads would be appreciated.

Thanks
 
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  • #2
Radiation heat losses are reasonably straightforward to calculate- the total power radiated is a product of the temperature-weighted blackbody curve with the spectrally-weighted emissivity, integrated over all wavelengths.

There can be other processes- conduction and convection- that cause heat transfer as well. Those can be much more complicated, depending on the geometry.
 
  • #3
Rohsenow & Hartnett
 
  • #4
Thanks for the help Andy and Bystander.
 

What is thermal radiation?

Thermal radiation is a type of electromagnetic radiation emitted by objects due to their temperature. It is also known as heat radiation or infrared radiation.

How is thermal radiation from a liquid or gas different from solid objects?

Liquids and gases can also emit thermal radiation, but they do so in a different manner compared to solid objects. Solids emit thermal radiation due to the vibration of their molecules, while liquids and gases emit thermal radiation due to the movement and collision of their molecules.

What factors affect the amount of thermal radiation emitted by a liquid or gas?

The amount of thermal radiation emitted by a liquid or gas depends on its temperature, surface area, and the properties of the material. Higher temperatures and larger surface areas result in higher amounts of thermal radiation being emitted.

How does thermal radiation from a liquid or gas transfer heat?

Thermal radiation from a liquid or gas can transfer heat through radiation. When the thermal radiation is absorbed by another object, it causes the molecules in that object to vibrate, increasing its temperature.

What are some practical applications of thermal radiation from liquids or gases?

Thermal radiation from liquids or gases has many practical applications, including cooking, heating, and energy production. It is also used in industries such as metallurgy, where it is used to heat and shape metals.

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