Surface Absorptance Without Radiant Emittance

I
Thread starter j1230
Start date Jan 11, 2023
Tags

Surface Thermal physics Thermodaynamics Uni

In summary, surface absorptance without radiant emittance is a measure of the amount of radiation that is absorbed by a material without taking into account the amount of radiation that is emitted by the material. It is typically expressed as a percentage and is important in understanding the energy balance of a material. This measurement is typically done through experiments in a controlled environment, and factors such as material composition, texture, and color, as well as environmental conditions, can affect the absorptance. It is crucial in materials science for applications such as solar energy, thermal insulation, and heat transfer. It differs from surface absorptance with radiant emittance, which takes into account both absorbed and emitted radiation, and can lead to different values for the same material.

Jan 11, 2023

j1230

TL;DR Summary: surface absorption

how can I go about finding the surface absorptance of a material if I'm not given the radiant emittance of the non- black body?

Physics news on Phys.org

Jan 11, 2023

Baluncore

Science Advisor

2023 Award

Illuminate the surface with a square wave modulated or a pulsed source.
Then synchronously detect the reflected energy as an AC signal.
The DC output will be due to emittance of the body.

What is surface absorptance without radiant emittance?

Surface absorptance without radiant emittance is a measure of how much electromagnetic radiation a material absorbs without emitting any radiation of its own. It is a property that describes the efficiency of a material in absorbing radiation.

How is surface absorptance without radiant emittance measured?

Surface absorptance without radiant emittance is typically measured using a spectrophotometer, which measures the amount of radiation that is absorbed by a material at different wavelengths. The results are then used to calculate the absorptance value.

Why is surface absorptance without radiant emittance important?

Surface absorptance without radiant emittance is important because it is a key factor in determining the thermal properties of a material. It is also important in designing materials for specific applications, such as solar panels, where the ability to absorb radiation is crucial.

What factors affect surface absorptance without radiant emittance?

The surface texture, color, and chemical composition of a material can all affect its absorptance without radiant emittance. Rougher surfaces and darker colors tend to have higher absorptance values, while smoother surfaces and lighter colors tend to have lower values.

How can surface absorptance without radiant emittance be improved?

Surface absorptance without radiant emittance can be improved by using materials with higher absorptance values, such as darker colors or rougher textures. Additionally, surface treatments or coatings can be applied to increase the absorptance of a material.