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>Comments on: 'Solid cross-flow into the spout and particle trajectories in conical spouted beds' by San Jose Maria, J., et al., Chemical Engineering Science 53 (1998) 3561-3570
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Comments on: 'Solid cross-flow into the spout and particle trajectories in conical spouted beds' by San Jose Maria, J., et al., Chemical Engineering Science 53 (1998) 3561-3570
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机译：评论：San Jose Maria，J.等人，Chemical Engineering Science 53（1998）3561-3570“在圆锥形喷口中有固体横流进入喷口和颗粒轨迹”
(1) Themeasuredparticleverticalvelocityinthespoutasshown in Figs.2,3and8seemsnotreasonable.Thesameremarkappliesto other measurementspublishedbytheauthorsin Olazar etal.(1995) (Fig. 9)andin Olazar etal.(1998) (Figs. 4–6).Alltheseexperimental findings revealthatthemaximumsolidverticalvelocityinthespout occurs nearthegasinlet(z = 0.03 m, r = 0). Thismaximumvelocity was foundtobearound8.0m/swhichisunphysicalconsideringthe spouted bedgeometricalparameters,operatingparametersandthe type ofsolidparticlesused.Thiscanbeexplainedthroughasimple analysis basedonkinematicsandhydrodynamicsofsolidparticles using theprovidedexperimentalresults.Letusfirstmentionthat the measuredvoidagecorrespondingtoFig.3ispresentedinFig.8 in San Joséetal.(1998b). Itcanbeseenthatthemeasuredflownear the inletisverydilutewithavoidagethatexceeds STXmin =0.95 inthe region betweenthebedbottom z = 0 and z = 0.05 m.Weassumethe average verticalaccelerationoftheparticleis a. Atthisacceleration a particlemovesfrom z = 0 to0.03mandgainedthemaximum velocity of8m/sintime ta as itwaspredictedbytheexperimental work.
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