スケール付着面上での単一液滴の蒸発挙動と伝熱特性

概要

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The present report aims at presenting basic data to prove the wetability of a heated surface contaminated by scale adherence by comparing the behaviors of a water droplet on a contaminated surface and a glossy surface polished by emery paper. A water droplet (2.3 mm in dia. ) of about 18℃ is dropped from a height of 20 mm above the heated surface and the evaporation behavior on the heated surface is photographed by a high speed camera. The initial temperatures of the heated surface are in the range of 140-220℃. At temperatures of the heated surface above 200℃, in the case of a fresh surface, the residence time of a drop on the heated surface is about 13 ms. While in the case of a contaminated surface, even if the drop is about to rebound from the heated surface, its root is so firmly contacted with the heated surface through the thin liquid film that the residence time is longer than that of the fresh surface. This fact proves that the surface with scale has a high wetability.
一般社団法人日本機械学会の論文
1988-08-25