日本地球惑星科学連合2019年大会

講演情報

[J] ポスター発表

セッション記号 A (大気水圏科学) » A-GE 地質環境・土壌環境

[A-GE31] New Roles of Soil Science for Extraterrestrials

2019年5月28日(火) 13:45 〜 15:15 ポスター会場 (幕張メッセ国際展示場 8ホール)

コンビーナ:登尾 浩助(Meiji University)、溝口 勝(東京大学大学院農学生命科学研究科)

[AGE31-P03] 微小重力下における毛管中の水分移動速度の低下

*丸尾 裕一1佐藤 直人1長沼 菜摘1野川 健人1登尾 浩助2 (1.明治大学大学院、2.明治大学)

キーワード:土壌物理学、微小重力、水分移動

The international deep space gateway is going to be built on the moon orbit from early 2020s. As manned space missions may get farther and longer, the importance of food production in space increases. For food production by growing crops in space, water by the crops plays an important role; however, few workers have conducted research on water movement in porous media under microgravity. It was reported that a water infiltration rate in porous media was slower under microgravity than under 1G. The objective of this study is to reveal what makes water move slower in porous media under microgravity. Capillary rises in capillary tubes, which were simpler pores, were observed under microgravity induced by a free-fall tower. The measured rates of capillary rise were slower than theoretical values calculated by Lucas-Washburn equation for 1G condition. The slower rates could be explained if either surface tension, contact angle, or viscosity are the function of gravity. Previous research reported that larger viscosity was observed under microgravity than under 1G although surface tension and contact angle were not changed by gravity. Slower water flows in capillary tubes under microgravity may be explained by changes in viscosity as a function of gravity.