J056022 砕波を伴う高風速域における物質輸送量の評価([J05602]乱流における運動量,熱,物質の輸送現象(2))

概要

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To predict the future global warming, one of the important issues is to precisely estimate mass transfer rate of greenhouse gases (e.g. CO_2 gas) across the air-water interface between atmosphere and oceans which cover about 70% of the surface of the earth. In this study, the effect of fetch on mass transfer across the air-water interface with wave breaking in high speed wind region is investigated through laboratory experiments in a wind-wave tank. The CO_2 transfer coefficient in the liquid side, kL, is measured by applying the mass-balance method to CO_2 evasion experiments. In the mass-balance method, vertical and horizontal distributions of wind velocity and CO_2 concentration in air are taken into account. The results show that kL increases rapidly in high speed wind region where the wind wave breaks and dispersed droplets and entrained bubbles are generated, and that it is not affected by the fetch in any wind speed region.
一般社団法人日本機械学会の論文
2011-09-11