OBSERVATION ON POTENTIAL ENERGY CHANGE AND CONTACTOPY CHANGE IN 2-D COMPACTION INHIBITED BRAZILIAN NUT EFFECT

• Main Author: NURUL AIN (NIM : 90213009), TRISE
• Format: Theses
• Language: Indonesia
• Online Access: https://digilib.itb.ac.id/gdl/view/24575
• Institution: Institut Teknologi Bandung

Experiments compaction inhibited Brazilian nut effect by using intruder with 2,4 cm diameter and diameter bed granular (cm): 0,68, 0,53, 0,47, 0,42, and 0,375 have done. Vibration taken under frequency (Hz): 14, 15, 16, 17, 18 and 19 with external energy given to system in the form of &#915; constant that is 3. Vibration process is discontinued with interval of each vibration around one second. This technique is used to make easier photo taken during vibration. The place of granular material shaking is made of acrylic with the width 10 cm. Experiment <br /> <br /> results show contactopy both of system with intruder and system without intruder are increasing. Average contactopy of system without intruder toward ratio granular bed diameter and width of shaking place give logarithmic equation (FORMULA)C with &#916;C is the change of contactopy, d is granular bed diameter and L is the width of shaking place. The equation give value of contactopy under certain ratio granular bed diameter and width of shaking place. <br /> <br /> Potential energy change is found from calculation based on the data height change. Based on the data, potential energy are decreasing for both system with intruder and system without intruder. This research results confirm that increasing contactopy and decreasing potential energy is not only valid for Brazilian nut effect but also valid for compaction inhibited Brazilian nut effect.