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您的检索式：作者名="S.S.Mallick"
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| 1 | An investigation into flow mode transition and pressure fluctuations for fluidized dense-phase pneumatic conveying of fine powders显示文摘This paper presents the results of an ongoing investigation into the fluctuations of pressure signals due to solids-gas flows for dense-phase pneumatic conveying of fine powders.Pressure signals were obtained from pressure transducers installed along different locations of a pipeline for the fluidized dense-phase pneumatic conveying of fly ash(median particle diameter 30μm;particle density 2300kg/m^3;loosepoured bulk density 700kg/m^3) and white powder(median particle diameter 55 u.m;particle density1600kg/m^3;loose-poured bulk density 620kg/m^3) from dilute to fluidized dense-phase.Standard deviation and Shannon entropy were employed to investigate the pressure signal fluctuations.It was found that there is an increase in the values of Shannon entropy and standard deviation for both of the products along the flow direction through the straight pipe sections.However,both the Shannon entropy and standard deviation values tend to decrease after the flow through bend(s).This result could be attributed to the deceleration of particles while flowing through the bends,resulting in dampened particle fluctuation and turbulence.Lower values of Shannon entropy in the early parts of the pipeline could be due to the non-suspension nature of flow(dense-phase),i.e.,there is a higher probability that the particles are concentrated toward the bottom of pipe,compared with dilute-phase or suspension flow(high velocity),where the particles could be expected to be distributed homogenously throughout the pipe bore(as the flow is in suspension).Changes in straight-pipe pneumatic conveying characteristics along the flow direction also indicate a change in the flow regime along the flow. | A.Mittal S.S.Mallick P.W.Wypych | 2014 | Particuology2014，12，5： | 14 |
| 2 | Energy loss at bends in the pneumatic conveying of fly ash显示文摘An accurate estimation of the total pressure drop of a pipeline is important to the reliable design of a pneumatic conveying system.The present paper presents results from an investigation into the modelling of the pressure drop at a bend in the pneumatic conveying of fly ash.Seven existing bend models were used(in conjunction with solids friction models for horizontal and vertical straight pipes,and initial acceleration losses) to predict the total pipeline pressure drop in conveying fly ash(median particle diameter:30 μm;particle density:2300 kg/m^3;loose-poured bulk density:700 kg/m^3) in three test rigs(pipelines with dimensions of 69 mm inner diameter(I.D.) × 168 m length:105 mm I.D.× 168 m length;69 mm I.D.× 554 m length).A comparison of the pneumatic conveying characteristics(PCC) predicted using the seven bend models and experimental results shows that the predicted total pipeline PCC and trends depend on the choice of bend model.While some models predict trends that agree with the experimental results,other models predicted greater bend pressure drops for the dense phase of fly ash than for the dilute phase.Models of Pan,R.(1992).Improving scale-up procedures for the design of pneumatic conveying systems.Doctoral dissertation,University of Wollongong,Australia.Pan,R.,& Wypych,P.W.(1998).Dilute and dense phase pneumatic conveying of fly ash.In Proceedings of the sixth International Conference on Bulk Materials Storage and Transportation(pp.183-189),Wollongong,NSW,Australia and Chambers,A.J.,& Marcus,R.D.(1986).Pneumatic conveying calculations.In Proceedings of the second International Conference on Bulk Materials Storage and Transportation(pp.49-52).Wollongong,Australia reliably predicted the bend losses for systems conveying fly ash over a large range of air flows. | Naveen Tripathi Atul Sharma S.S.Mallick P.W.Wypych | 2015 | Particuology2015，13，4： | 5 |
| 3 | Validated scale-up procedure to predict blockage condition for fluidized dense-phase pneumatic conveying systems显示文摘This paper presents results of an ongoing investigation into modelling fluidized dense-phase pneumatic conveying of powders.For the reliable design of dense-phase pneumatic conveying systems,an accurate estimation of the blockage boundary condition or the minimum transport velocity requirement is of significant importance.The existing empirical models for fine powder conveying in fluidized dense-phase mode are either based on only a particular pipeline and product or have not been tested for their accuracy under a wide range of scale-up conditions.In this paper,a validated test design procedure has been developed to accurately scale-up the blockage boundary with the help of a modelling format that employs solids loading ratio and Froude number at pipe inlet conditions using conveying data of two different samples of fly ash,electro-static precipitation(ESP) dust and cement(particle densities:2197-3637 kg/m^3;loose poured bulk densities:634-1070kg/m^3:median size:7-30 μm).The developed models(in power function format) have been used to predict the blockage boundary for larger diameter and longer pipelines(e.g.models based on 69 mm I.D.× 168 m long pipe have been scaled up to 105 mm I.D.and 554 m length).The predicted blockage boundaries for the scale-up conditions were found to provide better accuracy compared to the existing models. | G.Setia S.S.Mallick P.W.Wypych Renhu Pan | 2013 | Particuology2013，11，6： | 2 |
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