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Indexed by:期刊论文

Date of Publication:2014-04-01

Journal:ENERGIES

Included Journals:SCIE、EI、Scopus

Volume:7

Issue:4

Page Number:2079-2094

ISSN No.:1996-1073

Key Words:temperature; rebound characteristics; impaction experiments; normal restitution coefficient

Abstract:This study investigated the rebound behavior of SiO2 particles normally impacting a planar surface under different temperature conditions. The system has been characterized for an aerosol inlet temperature range of 20-190 degrees C, flow velocities of 0-20 ms(-1), and an impaction surface temperature range of 20-140 degrees C. For the first time, while keeping the same temperature gradient from the high-to low-temperature regions, the influences of varying temperature on the rebound behavior of SiO2 particles normally impacting a plane surface were examined. At increased temperatures, the plastic deformation increases and the coefficient of restitution reduces. The critical velocity is between 0.542 and 0.546 m/s under condition 1 (the carrier gas temperature (T-g) and the impaction surface temperature (T-W) remain at room temperature of 20 degrees C), which increases to between 0.829 and 0.847 m/s under condition 4 (T-g and T-W remain at temperatures of 190 degrees C and 140 degrees C, respectively). The experimental results show that the critical velocity increases with increasing temperature.