Experimental Fluid Dynamics Study of a New Fractal Dual-Flow Tray
2020
Countercurrent flow in conventional dual-flow trays results in segregation in liquid and vapor flow, reducing tray efficiency. Therefore, a new dual-flow tray with fractal geometry was experimentally investigated. Air and water were used as vapor and liquid models. Flow regime and fluid dynamics parameters such as dry (ΔPd) and wet (ΔPw) tray pressure drop, froth height (H), clear liquid height (hCL), and froth porosity (ε) were evaluated. The results showed a lower and a more stable ΔPw in the fractal tray with a smaller hole diameter compared to the conventional tray when Fₛ ranged from 0.59 to 1.04. Fluid dynamics parameters such as H, hCL, and ε were similar between the fractal tray with a smaller hole diameter and the conventional tray for capacity factor (Fₛ) values from 0.68 to 1.04 and for all values of liquid flow rate (QL). Fractal geometry provided a more stable liquid and vapor flow through the alternating formation of high and low pressure microzones.
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