Elucidating the role of dust concentrations and initial turbulence on rice flour explosion

Wan Zaiton, Wan Sulaiman and Mohd Fadzil, Mohd Idris and Jolius, Gimbun (2025) Elucidating the role of dust concentrations and initial turbulence on rice flour explosion. Powder Technology, 453 (120653). pp. 1-12. ISSN 0032-5910. (Published)

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Abstract

The explosibility and severity characteristics of rice flour at different concentrations and ignition delay times were investigated experimentally. Meanwhile, the turbulent flow and dust dispersion that affect the dust explosion in a Siwek 20 L spherical chamber were elucidated using computational fluid dynamics (CFD) simulation. The dust injected at 21 bar from the bottom of the chamber was observed to move in an upward direction until it hit the wall and recirculated, then dispersed all over the chamber. The turbulent kinetic energy and velocity magnitude in the camber were observed to increase significantly in the first 20 ms, then reduce thereafter. It was found that the rice flour explosibility is much higher at a higher ignition delay time (tv) of >60 ms, while the lowest explosibility was observed at 20 ms due to the low concentration of dust at the point of ignition. Contrary to the explosibility, the maximum explosion overpressure (Pmax) of dried rice flour is the highest at the tv of 20 ms compared to those obtained at 60 and 100 ms, owing to the densely packed dust at the centre of the chamber. This study may provide a useful insight into the dust explosibility of rice flour dust cloud.

Item Type:	Article
Additional Information:	Indexed by Scopus
Uncontrolled Keywords:	Dust dispersion; Explosibility; Explosion overpressure; Ignition delay time; Rice flour
Subjects:	Q Science > Q Science (General) T Technology > TP Chemical technology
Faculty/Division:	Faculty of Industrial Sciences And Technology Faculty of Chemical and Process Engineering Technology Centre for Research in Advanced Fluid & Processes (Fluid Centre)
Depositing User:	Mrs Norsaini Abdul Samat
Date Deposited:	30 May 2025 04:06
Last Modified:	30 May 2025 04:06
URI:	http://umpir.ump.edu.my/id/eprint/44692
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