The evolution of potential energy and contactopy two dimension granular materials in the case of compaction inhibited Brazil-nut effect

6th Asian Physics Symposium

Ain, T.N.^1 ; Wibowo, H.A.C.^1 ; Khotimah, S.N.^1 ; Viridi, S.^1

Nuclear Physics and Biophysics Research Division, Institut Teknologi Bandung, Jalan Ganesha 10, Bandung

40132, Indonesia^1

关键词: Acrylic material;    Brazil nut effect;    Logarithmic equations;    Minimum energy principle;    Potential energy changes;    Two-dimension;    Vibrating systems;    Vibration techniques;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/739/1/012135/pdf
DOI  :  10.1088/1742-6596/739/1/012135

来源: IOP

【 摘 要 】

Compaction inhibit Brazil nut effect experiment by using acrylic material as bed and intruder has peformed. There are five diameter of granular bed (cm): 0.68, 0.53, 0.47, 0.42, and 0.375 and single intruder with diameter 2.4 cm used in this experiment. Vibration taken under= 3 and frequency (Hz): 14, 15, 16, 17, 18, and 19. Discontinue vibration technique is used in this experiment. Vibrating system is done around one second then stop for a moment before next vibration. This technique used to make easier the process photo taken in each second. These photos then processed to gain contactopy and height of system. Based on the data, contactopy of all system observed are increasing. The average of contactopy without intruder system toward ratio of granular bed diameter and the width of shaking place giving logarithmic equation δ=-210,5ln(d/L) - 443,56. This equation show the value of contactopy without intruder system under certain ratio of granular bed diameter and the width of shaking place. Potential energy change for both system without intruder and with intruder are decreasing as the height system is decreasing. These result show that compaction inhibit Brazil nut effect phenomena still obey the minimum energy principle (MEP). The whole results of this research confirm that increasing contactopy and decreasing potential energy not only valid for Brazil nut effect, but also for compaction inhibit Brazil nut effect phenomenon.