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Research articles

ScienceAsia 49S (2023): 43-49 |doi: 10.2306/scienceasia1513-1874.2023.s008


Effects of convection and segregation generated by granular materials in a pseudo-2D rectangular container under vertical vibration


Panupat Chaiworn*, Patcharee Duangjai, Pensri Pramukkul*

 
ABSTRACT:     This research examined the effect of convection and segregation generated by granular materials in a pseudo-2D rectangular container under vertical vibration. This experiment used different wall angles with vibration frequencies to affect the convection speed of granular materials. The angles of the container wall were 90, 85, 80, and 75 degrees, while the frequencies of the vibrator were 28, 29, and 30 Hz. The convection of the bed materials and the intruder materials resulted in a flow cycle along the left side of the container wall and surrounded the bed materials. In continuous vibrating experiments, the top surface of the bed materials was tilted. Afterward, the intruder material moved along the top surface of the granular material. Subsequently, the invasive granular materials traveled up along the right wall of the container and descended to the bottom along the left wall, completing an entire cycle to the starting point. When the angle of the container wall and the frequencies were increased, the intruder materials convected cells significantly faster, forming a smaller, asymmetrical loop. In contrast, the intruder material would slowly develop a more extensive, asymmetrical loop when the angle and frequency of the container wall decreased. The segregation effect was generated by the container wall with the vertical vibration of granular materials.

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a Department of Physics and General Sciences, Chiang Mai Rajabhat University, Chiang Mai 50300 Thailand

* Corresponding author, E-mail: Panupat_cha@g.cmru.ac.th, Pensri_Pra@g.cmru.ac.th

Received 17 Jan 2023, Accepted 1 Nov 2023