Presentation Information
[O12-P62]Analysis of Water Flow on the Martian Surface with a Gravity Variable Apparatus: Part IV
*Kaito Hikawa1, *Chisato Yoshimura1, *Hinaki Ookouchi1, *Hiroyuki Maruyama1, *Rin Tsugita1, *Rento Kurata1, *Takuma Kuwasaka2, *Shiyui Yoshitani2, *Haruki Ohama1, *Reo Ogaw2, *Towa Igarashi3, *Souma Shimohama3, *Hyouga Hidaka3, *Masahide Yoshida3 (1. Kasugaoka Senior High School of Osaka Prefecture: The evening course, 2. Tomiokanishi Senior High School of Tokushima Prefecture, 3. Imamiya Technology Senior High School of Osaka Prefecture: The evening course)
Keywords:
Gravity Variable Apparatus,Martian gravity,Water permeation
Our joint Science Club team has been studying how water permeates sand under Martian gravity using a variable gravity apparatus. Through this research, we have sought to clarify the relationship between the rate of water permeation through sand and the gravitational force and particle size. Last year, we conducted experiments under four different gravitational conditions: Earth gravity (1.0G), 0.7G, Martian gravity (0.36G), and 0.23G. We also conducted experiments using sand with four different particle sizes (0.85 mm, 1.19 mm, 1.75 mm, and 2.25 mm). As a result, we experimentally confirmed the relationship between infiltration velocity (absolute value), gravity, and sand particle size. For sand with particle sizes of 1.19 mm, 1.75 mm, and 2.25 mm, the terminal infiltration velocity was proportional to gravity. However, for sand with a particle size of 0.85 mm, contrary to these results, the infiltration velocity actually decreased when gravity increased (1.0 G). To determine the cause of this phenomenon, we conducted a series of experiments. As a result, we found that changes in the porosity of sand are related to the sand infiltration velocity. We report the details here.