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Prediction of interphase drag coefficient and bed expansion using a variational model for fluidization of small spherical particles
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作者 mihal duris Zorana Arsenijevic +1 位作者 Radmila Garic-Grulovic Tatjana Kaluderovic Radoicic 《Particuology》 SCIE EI CAS CSCD 2020年第4期184-192,共9页
In this study,we applied the variational model to fluidization of small spherical particles.Fluidization experiments were carried out for spherical particles with 13 diameters between dp=0.13 and 5.00 mm.We propose a ... In this study,we applied the variational model to fluidization of small spherical particles.Fluidization experiments were carried out for spherical particles with 13 diameters between dp=0.13 and 5.00 mm.We propose a generalized form of our variational model to predict the superficial velocity U and interphase drag coefficientβby introducing an exponent n to describe the different dependences of the drag force Fd on fluid velocity for different particle sizes(different flow regimes).By comparing the predictions with the experimental results,we conclude that n=1 should be used for small particles(dp<1 mm)and n=2 for larger particles(dp>1 mm).This conclusion is generalized by proposing n=1 for particles with Ret<160 and n=2 for particles with Ret>160.The average mean absolute error was 5.49%in calculating superficial velocity for different bed voidages using the modified variational model for all of the particles examined.The calculated values ofβwere compared with values of literature models for particles with dp<1.0 mm.The average mean absolute error of the modified variational model was 8.02%in calculatingβfor different bed voidages for all of the particles examined. 展开更多
关键词 Calculus of variations Isoperimetric problem Bed expansion Drag coefficient FLUIDIZATION Spherical particles
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