Revealing flow structure of air and rice husk in the acrylic suspension furnace: simulation study and cold test experiment

Pasymi, pasymi (2024) Revealing flow structure of air and rice husk in the acrylic suspension furnace: simulation study and cold test experiment. Revealing flow structure of air and rice husk in the acrylic suspension furnace: simulation study and cold test experiment.

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Abstract

An acrylic suspension furnace was used to study the flow structure of air and rice husk. The standard k–ε model with standard wall function was employed in the simulation study while the cold test experiment, for results validation, utilized onionskin (thin oil paper) and rice husk itself. From the simulation, both air and rice husk flows are in swirling mode due to the tangential air. The cold test experiment strengthened that swirl flow of air is indicated by the onionskin movement upward and downward forming a curve and circular directions. On the other hand, swirl flow of rice husk is visualized by the sinusoidal peaks and valleys. In addition, the contribution of secondary air generates recirculation flow at the bottom area of the furnace. Also, there are backflow phenomena that occur, and yet, the revalidation study revealed that modification of tangential air pipes angle with a longer burner length can overcome the problem. Finally, this model can predict the flow structure in a good compliment to the cold test experiment results. Moreover, the less-intensive computation load with a shorter computation time makes it in demand for the design purpose and performance evaluation of process equipment.

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