1995
DOI: 10.1016/0009-2509(95)00040-c
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Experimental and theoretical studies of pressure drop hysteresis in trickle bed reactors

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Cited by 43 publications
(56 citation statements)
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“…The ratio of liquid-solid mass transfer coefficients in the two modes is therefore roughly proportional to the square root of the inverse ratio of holdup. Wang et al 9 showed that smaller particles have more severe holdup hysteresis and one can therefore expect the holdup ratio to be larger than that reported for the 3 mm spheres (Table 1). Since the holdup in the Levec mode is lower than that in the Kan-Liquid mode, the Levec coefficient exceeds the Kan-Liquid coefficient.…”
Section: Resultsmentioning
confidence: 91%
See 1 more Smart Citation
“…The ratio of liquid-solid mass transfer coefficients in the two modes is therefore roughly proportional to the square root of the inverse ratio of holdup. Wang et al 9 showed that smaller particles have more severe holdup hysteresis and one can therefore expect the holdup ratio to be larger than that reported for the 3 mm spheres (Table 1). Since the holdup in the Levec mode is lower than that in the Kan-Liquid mode, the Levec coefficient exceeds the Kan-Liquid coefficient.…”
Section: Resultsmentioning
confidence: 91%
“…There is also the possibility of performing multiple loops (as discussed in Maiti et al 7 ), or combinations of loops such as gas flow rate variation induced hysteresis followed by liquid flow rate variation induced hysteresis. Recognizing the multitude of possibilities, Loudon et al 8 established approximate limiting cases of such loops by conscientiously defining a set of prewetting modes that form a conceptual basis by which hysteresis can be studied (a similar approach was followed by Wang et al 9 ). While the discussion has thus far used pressure drop as an example, it is important to note that similar loops exist for holdup, the gas-liquid volumetric mass transfer coefficient 8 and for wetting efficiency.…”
Section: Introductionmentioning
confidence: 98%
“…The rate of evaporation attributed to gas flow was found to be insignificant compared to the rate of draining. Note that this Levec prewetting procedure does deviate from the procedure stated by Wang et al, 12 who drained the bed without gas flow and prewetted the packing by pulsing with the liquid instead of flooding. In both cases, however, only the residual holdup remains before commencement of flow.…”
Section: Prewetting Procedures and Flow Conditionsmentioning
confidence: 94%
“…[8][9][10] Flow hysteresis and multiple hydrodynamic states are mostly quantified by pressure drop and holdup measurements. 5,6,[10][11][12] Differences in liquid flow morphology or shape are normally used to explain the existence of multiple hydrodynamic states 6,10 ; and computer-assisted tomography visualizations support this belief. 7,9 Popular descriptions of trickle-flow morphologies suggest that the distribution and nature of wetting efficiency may be functions of flow morphology, although no attempt has been made to quantify this.…”
Section: Introductionmentioning
confidence: 96%
“…It is possible that capillary pressure hysteresis is related to the hysteresis observed in the pressure drops and liquid holdups measured during cocurrent and countercurrent flow in packed beds (Kan and Greenfield, 1978;Levec et al, 1986Levec et al, , 1988Wang et al, 1998). However, Wang et al (1995) have attributed the pressure drop hysteresis to varying states of liquid and gas flow uniformity in the column, and have used the Sáez and Carbonell (1985) drag force expressions to model this effect. Grosser et al (1988) used the relative permeability drag force expressions for two-phase flow (Sáez and Carbonell, 1985) together with the Leverett correlation for the capillary…”
Section: Theories Of Trickling To Pulsing Transitionmentioning
confidence: 99%