コンテナ内貨物の汗ぬれ現象-I : 熱及び水蒸気移動に関する物性値の推定

概要

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Sweat damages have been a serious problem in the cargo container transportation for hygroscopic materials such as soybean, coffee bean, cacao bean, hey cube and so on. We prepared a miniature container, which limits the flows of heat and vapor in the vertical direction, in order to elucidate the phenomena of the sweat damages. The changes of the temperature and the vapor pressure of each part in the container, loaded soybeans, were measured during cooling. In addition, the changes were simulated by applying the temporary coefficients of heat and vapor transfer, according to the simultaneous transfer equation of heat and vapor and the adsorption equation. The calculated changes were harmonized with the observed changes to estimate the real coefficients. The coefficients show that natural convection takes place in the inner air layers and in voids of the soybean bulk. Further, the simulation for the amount of sweat on the ceiling is successfully in accord with the observed values and shows a maximum after about 10 hours and disappearance after about 30 hours. These results would allow us to predict the detail changes of the temperature and the vapor pressure inside containers and then lead the estimation on the amount of sweat on the ceilings.
社団法人日本航海学会の論文
2001-09-25