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- W2078471106 abstract "Abstract The counter-current back-mixing model of fluidised-bed behaviour is applied to experimental back-mixing data obtained in a 6-in diameter column, with beds consisting of glass spheres, of mean diameter 75μ, 97μ and 125μ respectively. With still larger particles, the gas velocity required to produce back-mixing is such that slugging is produced in the 6-in diameter column. While the data have been expressed as axial diffusion coefficients, primarily they have been interpreted in terms of the counter-current back-mixing model to determine 1. (i) the critical velocity, Ucr, at which back-mixing commences; Ucr/Uo ⋍ 3; 2. (ii) fw, the volume of dense phase, set in motion per unit volume of bubble; fw ⋍ 1·0. 3. (iii) the rate of gas-exchange between ascending and descending material. The rate calculated from the experimental data in terms of the back-mixing model is of the same order of magnitude as the theoretical estimate of the exchange rate given by Davidson and Harrison, but the dependence on bubble diameter is different." @default.
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- W2078471106 date "1970-01-01" @default.
- W2078471106 modified "2023-10-03" @default.
- W2078471106 title "Back-mixing of gas in a 6-in diameter fluidised bed" @default.
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- W2078471106 doi "https://doi.org/10.1016/0300-9467(70)85009-2" @default.
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