Das, Suchandan K and Godiwalla, K M and Panda, Lopamudra and Bhattacharyya, K K and Singh, Ratnakar and Mehrotra, S P (2007) Mathematical modelling of bagnold effect and separation behavior of a coal-washing spiral using a mechanistic approach. In: Advanced Gravity Separation, Aug 30 - Sept 1, 2007, NML Jamshedpur.
Among the gravity separators, the spiral concentrator is considered to be one of the most efficient and simple unit operations. Complex mechanisms, including the combined effects of different forces, differential particle settling rates, interstitial trickling and possibly hindered-settling affect the stratification of particles. "Bagnold effect" arises at relatively high pulp densities of the feed. This effect is attributed to the velocity distribution along the depth of the flowing film, which gives rise to a distribution of shear rates along the depth of flow. An improved mathematical model incorporating Bagnold effect is proposed to characterize the separation behavior of a coal-washing spiral. Sensitivity studies of the operating parameters on the segregation behavior of particles across the radial width of the trough during their motion along the spiral have been carried out. It is believed that the model reasonably mimics the segregation behavior of a particle during its motion along the spiral with a reasonable degree of realism.
|Item Type:||Conference or Workshop Item (Paper)|
|Uncontrolled Keywords:||Spiral, Mathematical modelling, Coal washing, Mechanistic approach|
|Divisions:||Mathematical Modelling and Simulation|
|Deposited By:||Dr. A K Sahu|
|Deposited On:||30 Jul 2010 12:35|
|Last Modified:||02 Dec 2011 12:01|
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