Effect of Perforation Geometry and Tube Diameter of Vertical Aerator From LAMB Dryer on Air Distribution Uniformity

Valerian Kong; Chi Huey Ng; Jidon Janaun.

Transactions on Science and Technology, 8(3-3), 445 - 450.

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Laterally Aerated Moving Bed (LAMB) dryer consists of a perforated vertical inner tube that distributes hot air radially. Six different types of perforated tubes were tested to investigate the airflow pattern by analyzing the non-uniformity flow coefficient and pressure drop accordingly with different perforation geometry and tube diameter. High uniformity of air outlet from all perforated tubes was confirmed with the low value of non-uniformity flow coefficient with the range 0.000041 to 0.00055. Furthermore, circle shape perforated hole with 4 mm diameter has the highest pressure drop and rectangle hole with 5mm x 2mm dimension have the lowest pressure drop. 1inch diameter of the tube has the highest pressure drop. This finding will aid in the optimization of the perforated tube design for the LAMB dryer system.

KEYWORDS: Dryer; uniformity; LAMB dryer; perforated tube; pressure drop.

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  1. Bajura, R. A. & Jones, Jr. E. H. 1976. Flow distribution manifolds. Journal of Fluids Engineering, 98(4), 654–665.
  2. Chen, A. W. & Sparrow, E. M. 2009. Effect of exit-port geometry on the performance of a flow distribution manifold. Applied Thermal Engineering, 29(13), 2689–2692.
  3. Chiou, J. P. 1982. The effect of nonuniform fluid flow distribution on the thermal performance of solar collector. Solar Energy, 29(6), 487–502.
  4. Greskovich, E. J. & O’Bara, J. T. 1968. Perforated-pipe distributors. Industrial and Engineering Chemistry Process Design and Development, 7(4), 593-595.
  5. Mokhtari, S., Kudriavtsev, V. V. & Danna, M. 1997. Flow uniformity and pressure variation in multi-outlet flow distribution pipes. Advances in Analytical, Experimental and Computational Technologies in Fluids, Structures, Transients and Natural Hazards, 355, 113–117.
  6. Peladeau-Pigeon, M. 2012. Simulation of Perfusion Flow Dynamics for Contrast Enhanced Imaging. MSc Thesis, University of Toronto, Canada.