細径クライオプローブにおける液体窒素の微細噴流沸騰熱伝達

概要

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A novel, flexible, long, slender cryoprobe with a vacuum insulation layer of the outermost diameter 3.1mm and length 1m has been developed for cryosurgery of tumors and cancers. The tip of the cryoprobe was cooled by a micro-impinging jet of liquid nitrogen; the maximum cooling heat flux of 1.5MW/m^2 was attained. The boiling heat transfer characteristics of the micro-impinging jet was investigated in detail using three types of probe-tips with hemispherical surface and flat surfaces with/without a needle. The effects of the mass flow rate of LN_2, jet mouth-to-tip distance, shape of probe-tip, and surface roughness on the boiling heat transfer were experimentally examined. The probe-tip of the hemispherical surface finished with a sand paper of emery 500 showed the best cooling performance for cryosurgery.
一般社団法人日本機械学会の論文
1991-06-25