Oxygen transfer and hydrodynamics in three-phase inverse fluidized beds

Comparison of Fixation Distances in Middle-Aged Subjects

“…For both water and CMC solution, the Sherwood number increases with increasing particle size. It has been observed using hydrodynamic studies that as the Modified Reynolds number (either for gas or liquid) increases, the solids and liquid hold-ups decreases, but the gas hold-up increases for both water and CMC solutions [14]- [17]. Also, it has been found that solids holdup are less, where as liquid and gas holdups are slightly more for CMC solutions than water.…”

Modeling and Simulation of Three Phase Fluidized Bed Characteristics Using MATLAB

“…2, No. 6, November 2012 It has been observed using hydrodynamic studies that as the Modified Reynolds number (either for gas or liquid) increases, the solids and liquid hold-ups decreases, but the gas hold-up increases for both water and CMC solutions [14]- [17]. Also, it has been found that solids holdup are less, where as liquid and gas holdups are slightly more for CMC solutions than water.…”

Influence of fluid-mechanical characteristics of the system on the volumetric mass transfer coefficient and gas dispersion in three-phase system

“…Istraživanja su pokazala da zapreminski koeficijent prenosa mase zavisi od distribucije i veličine mehurova u sistemu [7], kao i da ponašanje mehurova u sistemu, koje je uglavnom uslovljeno načinom disperzije, ima direktan uticaj na prenos mase i hidrodinamiku sistema [8]. U dosadašnjom istraživanjima ispitivan je uticaj različitih tipova ispune poput kamene, sta-klene, keramičke, plastične i sintetske, na prenos mase kiseonika u trofaznim sistemima [4,6,[9][10][11][12][13][14][15][16]. Ova ispitivanja su pokazala da osobine čestica koje čine ispunu, gustina i prečnik, kao i njihova količina, utiču na pojavu koalescencije, odnosno na prečnik mehura i zadržavanje gasa u sistemu [4,6,[9][10][11][12][13][14][15][16].…”

“…Na slici 3 se vidi da povećanje brzine gasa dovodi do povećanja broja mehurova, odnosno količine gasa u sistemu kao i to da su formirani mehurovi sitniji pri većoj brzini gasa. Da povećanje brzine gasa utiče na povećanje "hold-up"-a gasa i k L a, potvrđeno je i od strane drugih istraživača koji su ispitivali i druge tipove čestica [4,6,9,16,27,28].…”