Axial distribution of solid holdup in bubble column for gas‐liquid‐solid systems

Effect of solids on homogeneous–heterogeneous flow regime transition in bubble columns

“…Sometimes, an increase is detected (Banisi et al, 1995a). A negligible effect can be found too (Kelkar et al, 1984;Matsumoto et al, 1989;Fan et al, 1999). Pandit and Joshi (1984) resolve this ambiguity by showing that the graph e = e(d p ) has a peculiar structure of four qualitatively different regions: (i) small particles (Re < 2) increase the holdup, (ii) medium particles (2 Re 300) decrease, (iii) large particles (Re > 500) increase it again, and then (iv) the graph saturates at a roughly constant level (see also Pandit and Joshi, 1986).…”

“…Partly because of comparing results obtained under aforementioned different operating conditions, partly due to complex nature of the solid influence, where many aspects have to be taken into account. The presence of solids affect the gas-liquid mixture in many different ways: bubble formation (Yoo et al, 1997;Luo et al, 1998;Fan et al, 1999), bubble rise (Bly and Worden, 1992;Luo et al, 1997a;Fan et al, 1999), axial (Gandhi et al, 1999) and radial (Warsito et al, 1997) profiles, mixing and dispersion (Smith and Ruether, 1985;Matsumoto et al, 1989), mass transfer (Koide et al, 1984;Quicker et al, 1984;Pandit and Joshi, 1986;Charinpanitkul et al, 1993), and voidage and flow regimes. Unfortunately, it seems that there is no authoritative review available covering in detail this broad area where the reader could be referred to.…”

Transient discharge of solid particles from upper outlet of vertical bubble columns

“…The column, 15 cm in diameter and 2.7 m in height, was equipped with eleven shutter plates, and the other features were fundamentally the same as those of the 7-cm-diameter column. The gas distributor and other details have been described elsewhere (Matsumoto et al, 1989(Matsumoto et al, , 1991.…”

“…where Rexi is defined by u,,dPi/v, based on the settling velocity of isolated i particles, umi. According to Matsumoto et al (1989, Re,, is given by…”

“…Three-phase fluidization is an important technique for contacting gas, liquid, and solid particles and is widely used in petroleum and biochemical processes. Many works (Imafuku et al, 1968;Kato et al, 1972Kato et al, , 1985Smith and Ruether, 1985;Morooka et al, 1986;Smith et al, 1986;Murray and Fan, 1989;Matsumoto et al, 1989Matsumoto et al, , 1991Matsumoto et al, , 1992Hidaka et al, 1992) have been published on the behavior of solid particles in columns. Fan (1989) summarized results on fundamentals and applications of three-phase fluidization up to 1989.…”