Thermal conductivity measurements of porous dust aggregates: I. Technique, model and first results

Details Thermal conductivity measurements of porous dust aggregates: I. Technique, model and first results Thermal conductivity measurements of porous dust aggregates: I. Technique, model and first results

2011-01-13

arxiv.org/abs/1101.2586v4

Astronomy and Astrophysics

Astrophysics

Earth and Planetary Astrophysics

accepted by Icarus

Scientific paper

10.1016/j.icarus.2011.04.024

We present a non-invasive technique for measuring the thermal conductivity of fragile and sensitive materials. In the context of planet formation research, the investigation of the thermal conductivity of porous dust aggregates provide important knowledge about the influence of heating processes, like internal heating by radioactive decay of short-lived nuclei, e.g. 26Al, on the evolution and growth of planetesimals. The determination of the thermal conductivity was performed by a combination of laboratory experiments and numerical simulations. An IR camera measured the temperature distribution of the sample surface heated by a well-characterized laser beam. The thermal conductivity as free parameter in the model calculations, exactly emulating the experiment, was varied until the experimental and numerical temperature distributions showed best agreement. Thus, we determined for three types of porous dust samples, consisting of spherical, micrometer-sized SiO2 particles, with volume filling factors in the range of 15% to 54%, the thermal conductivity to be 0.002 to 0.02 W/(m*K), respectively. From our results, we can conclude that the thermal conductivity mainly depends on the volume filling factor. Further investigations, which are planned for different materials and varied contact area sizes (produced by sintering), will prove the appropriate dependencies in more detail.

Affiliated with

Also associated with

No associations

Rating

Thermal conductivity measurements of porous dust aggregates: I. Technique, model and first results does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.

If you have personal experience with Thermal conductivity measurements of porous dust aggregates: I. Technique, model and first results, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Thermal conductivity measurements of porous dust aggregates: I. Technique, model and first results will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-66768