Mass transfer between a fluid and an immersed object in liquid-solid packed and fluidized beds
| Autor: | M Nevenka Boskovic-Vragolovic, B Zeljko Grbavcic, V Danica Brzic |
|---|---|
| Rok vydání: | 2005 |
| Předmět: |
Mass transfer coefficient
Inert Void (astronomy) Chemistry Analytical chemistry packed beds 02 engineering and technology General Chemistry Liquid solid Particulates 021001 nanoscience & nanotechnology lcsh:Chemistry lcsh:QD1-999 020401 chemical engineering Fluidized bed correlation Mass transfer mass transfer 0204 chemical engineering particulate fludized beds 0210 nano-technology Dissolution |
| Zdroj: | Journal of the Serbian Chemical Society Journal of the Serbian Chemical Society, Vol 70, Iss 11, Pp 1373-1379 (2005) |
| ISSN: | 1820-7421 0352-5139 |
| Popis: | The mass transfer coefficient between fluid and an immersed sphere in liquid packed and fluidized beds of inert spherical particles have been studied experimentally using a column 40 mm in diameter. The mass transfer data were obtained by studying the transfer of benzoic acid from the immersed sphere to flowing water using the dissolution method. In all runs, the mass transfer rates were determined in the presence of inert glass particles 0.50-2.98 mm in diameter. The influence of different parameters, such as: liquid velocity, particles size and bed void age, on the mass transfer in packed and fluidized beds is presented. The obtained experimental data for mass transfer in the packed and particulate fluidized bed were correlated by a single correlation, thus confirming the similarity between the two systems. U ovom radu je eksperimentalno ispitivan prelaz mase između uronjene sfere i fluida u prisustvu pakovanih i fluidizovanih čestica. Za određivanje koeficijenta prelaza mase korišćena je metoda praćenja rastvaranja slabo rastvorne supstance- benzoeve kiseline u vodi. Korišćena je kolona prečnika 40 mm, uronjena sfera prečnika 21 mm, a pakovane i fluidizovane slojeve su činile staklene sfere prečnika 0,5-2,98 mm. Ispitivanja u pakovanim slojevima izvršena su u sistemima sa različitim pakovanjima - retkom i gustom. Prikazani su uticaji različitih parametara, kao što su brzina fluida, veličina čestica i poroznost slojeva na koeficijent prelaza mase. Pokazane su razlike i sličnosti u prenosu mase kada su u sloju prisutne nepokretne i fluidizovane čestice. Data je završna eksperimentalna korelacija koja je zajednička i za pakovane i za fluidizovane slojeve. Korelacija je data kao veza bezdimenzionih grupa Rep/(1-ε)i jDε koje nisu tipične za korelisanje podataka u fludizovanim slojevima. Ova korelacija ukazuje da postoji sličnost mehanizama prenosa mase u pakovanim i partikulativno fludizovanim slojevima. |
| Databáze: | OpenAIRE |
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