Fluidization dynamics.pdf
This book is intended l`or seientists nnd engineers who l`ind themselves involved. l`or rensons rnnging l`rom pure nendemie interest to dire indus- trinl neeessity. in problems eoneerning the lluidized stnte. It hns been written with two purposes in mind. The lirst is to present un unulysis direeted nt the predietion ol` lluidized bed behnviou r in systems l`or whieh empirienl dntu is limited or unuvuiluble. This represents it relevunt goul; beeuuse ulongside the ndvuntnges in the ehoiee ol`n lluidized environment l`or nehieving at proeessing objeetive there exist worrying uneertninties regurding the preeise nuture ol` the lluidizntion thut will ensue; purtieles
l`ree ol` direet eonstrnints on their positions nnd trujeetories mny well eomport themselves in it munner thnt is highly disudvnntugeous to the purpose l`or whieh they nre employed. Sueh oeeurrenees ure not unknown; disnstrous mistukes hnve been mude in the pnst. whieh inhibit the ndop- tion ol`npproprinte proeess solutions in the present.
The seeond objeetive is to provide n treutment ol` lluidizntion-dynumies thnt is rendily neeessible to the non-speeiulist. A strny eneounter with the lluid-dynnmie literuture on the subjeet eun be at diseoneerting experienee l`or the engineers seeking to improve their el`l`eetiveness in the prnetieul npplieution ol` lluidizntion teehnology. The lineur upproueh ndopted in this book. stnrting with the l`ormulution ol` predietive expressions l`or the primury l`orees ueting on at lluidized purtiele. is nimed nt providing n elenr route into the theory. nnd the ineorporntion ol` the l`oree terms in the eonservution equntions l`or muss und momentum, und subsequent nppli- entions. is presented in at mnnner whieh ussumes only the huziest reeollee- tion ol`elementnry lluid-dynnmie prineiples.
Although rel`erenee is mnde throughout to primnry souree mnterinl the npproneh in this respeet. ns in others. is at l`oeused one. no nttempt hnving been made to mix into the narrative a comprehensive survey of the back- ground literature; to have done so would have resulted in a very different book from the one intended. In deciding on how much detail to include I have been guided by experience in presenting much of this material in Master’s level degree courses in Italy and the UK. Students on the whole have no problem with being reminded of simple standard procedures, and a number positively welcome it; I have extrapolated these responses to the anticipated read- ership. In order to avoid clutter some common manipulations are given in
small-type paragraphs, which may be easily skipped over. In this way I hope to have defused objections to having, say, spelt out the steps in the formulation of a differential equation from a control volume balance, or the subsequent linearization procedure. Such criticism as may remain in that respect I feel can be lived with. What I have strenuously tried to avoid is the all too familiar cry for help from careful readers of the scientific literature: where on earth does that come from? The analyses presented in this book represent, by and large, a body of research that has appeared in numerous publications (predominantly in the chemical engineering literature) — some quite recent, others going back over nearly 20 years. In gathering these together for the purpose of producing a coherent narrative I have taken the opportunity to re-order much ofthe material, to correct errors and inconsistencies, and to add the details and clarifications that space constraints prohibit in journal pub- lications. The book could form the basis for university course modules in engineering and applied science at both undergraduate and graduate level, as well as for focused post-experience courses for the process and allied industries.
L.G. Gibilaro
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