Predicting bed voidage in solid-liquid fluidization.
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概要
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Previously published solid-liquid fluidization data and new experimental data were correlated to develop an explicit expression for bed voidage, <I>ε</I>, in solid–liquid systems. Based on the observed deviation between the voidage predicted by the Richardson–Zaki<SUP>18)</SUP> equation (<I>ε<SUB>RZ</SUB></I>) and the actual voidage, this new correlation assumes the form<BR><BR><I>ε</I> = <I>ε<SUB>PK</SUB></I> + (1 – <I>ε<SUB>PK</SUB></I>)<I>ε<SUB>RZ</SUB><SUP>A</SUP></I> exp(<I>B</I>(1 – <I>ε<SUB>RZ</SUB></I>)<BR><BR>where <I>A</I> = 2.2<I>n</I> + 8<I>d<SUB>P</SUB></I>/<I>D</I> and <I>B</I> = 2.1<I>n</I>. <I>ε<SUB>PK</SUB></I> is the "packed" bed or the static bed voidage (i.e., <I>ε</I> when the superficial liquid veIocity, <I>U<SUB>L</SUB></I>, is zero), <I>n</I> is the Richardson–Zaki<SUP>18)</SUP> exponent, and <I>d<SUB>P</SUB></I>/<I>D</I> is the particle diameter-to-column diameter ratio. A total of 811 data points were correlated with Reynolds numbers based on terminal velocity, <I>Re<SUB>t</SUB></I>, ranging from 0.7 to 3200. The correlation satisfactorily predicts voidage with a standard deviation of less than 5%.
- The Society of Chemical Engineers, Japanの論文
著者
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Hirata Akira
Department Of Chemical Engineering Waseda University
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Bulos Fredric
Department of Chemical Engineering, Waseda University
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