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An investigation of the unstable region for dense phase conveying in sliding bed flow

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Abstract.

For fine powdered materials, capable of being conveyed in dense phase, a conveying region exists in which instability in flow and pipeline blockage can occur if the pressure gradient available is insufficient to maintain a minimum value of solids loading ratio. A reduction in material flow rate can also lead to pipeline blockage in this region. Conveying trials under-taken with cement are used to illustrate the nature of the problem.

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References

  1. D. Mills, A first approximation method for the design of pneumatic conveying systems, Proc RelPowFlo, (Porsgrunn, Norway, 1999), p. 675–686

  2. D. Mills, J. S. Mason & P. Marjanović, An analysis of the dense phase pneumatic conveying of cement in vertical pipelines, Proc 9th Powder and Bulk Solids Conf, (Chicago, 1984), p. 125–147

  3. D. Mills, J. S. Mason & P. Marjanović, A comparison of pressure drops in horizontal and vertical dense phase pneumatic conveying, Proc 3rd Conf on Pneumatic Conveying, (Pecs, Hungary, 1985)

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  6. D. Mills, V. K. Agarwal and M. D. Bharathi, The pneumatic conveying of fly ash and cement at low velocity, Proc 24th Powder and Bulk Solids Conf, (Chicago, 1999), p. 147–163. Subsequently published in Advances in Dry Processing 2000, (1999), p. 43–50

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  8. J. S. Mason & D. Mills, Plenary lecture - 20 years of pneumatic conveying with the Powder and Bulk Solids Conference, Proc 20th Powder and Bulk Solids Conf, (Chicago, 1995), p. 3–40

  9. D. Mills, Material flow rates in pneumatic conveying, Chemical Engineering 109, (2002), p. 74–78

  10. F. Schaberg and B. F. Mehring, Dense phase conveying: large outputs/long distances, Proc Pneumatech 4 (Jersey, UK, 1987), p. 281–299

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Authors and Affiliations

  1. Pneumatic Conveying Consultant, Old Wives Lees, Canterbury, CT4 8BQ, UK

    David Mills

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  1. David Mills
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Correspondence to David Mills.

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Mills, D. An investigation of the unstable region for dense phase conveying in sliding bed flow. GM 6, 173–177 (2004). https://doi.org/10.1007/s10035-004-0162-1

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  • DOI: https://doi.org/10.1007/s10035-004-0162-1

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