Characteristics of Dry Ice Particles Produced by Expanding Liquid Carbon Dioxide and Its Application for Surface Cleaning
The characteristics of dry ice particles produced by expanding liquid carbon dioxide and it its application for surface cleaning have been studied experimentally. The production of the dry ice s particles was based on the Joule Joule-Thomson effect. The ejected dry ice particles were observed using a high high-speed microscope camera. Through digital image proc processing, the particle size and particle essing, velocity in the jet were analyzed. To in in-situ measure the size distribution of the dry ice particles, a laser diffraction method was used. The experimental results showed that the primary dry ice particles ejected fro from the expansion nozzle were about 1 μm in mass median diameter. The presence of a thermally insulated tube at the outlet of the nozzle enhanced the agglomeration of the particles, whereby agglomerates of about 100 μm in mass median diameter were formed. Th The performance of dry ice jet for removing fine particles adhering to surfaces was also evaluated using microscopic observation. It was found that the particle removal process consists of two stages —slow removal stage and rapid removal stage —that are relate related to the jet temperature.
Dry ice Jet flow Agglomeration Particle size measurement Removal efficiency.
Yi Yi-Hung Liu Shuji Matsusaka
Department of Chemical Engineering, Kyoto University, Nishikyo Nishikyo-ku, Kyoto 615 615-8510, Japan
国际会议
上海
英文
38-42
2011-10-27（万方平台首次上网日期，不代表论文的发表时间）