title: Experimental estimate of energy accommodation coefficient at high temperatures.
abstract: The energy accommodation coefficient (EAC), which is used to characterize gas-surface interactions, was experimentally estimated at high temperatures. A method utilizing laser irradiation to heat up nanoparticles that are generated in a flame was proposed. From the obtained dependence of particle temperature upon laser power, the EAC was derived to be approximately equal to 0.005, which agrees nicely with our recent rigorous theoretical result. It indicates that the efficiency of heat transfer between gas and particles is sufficiently small in high temperature system at large Knudsen numbers.
authors.affiliation: National CRI Center for Nano Particle Control, Institute of Advanced Machinery and Design, School of Mechanical and Aerospace Engineering, Seoul National University, Seoul 151-742, Korea.
authors.forename: I S
authors.initials: IS
authors.lastname: Altman
authors.forename: D
authors.initials: D
authors.lastname: Lee
authors.forename: J
authors.initials: J
authors.lastname: Song
authors.forename: M
authors.initials: M
authors.lastname: Choi