Experimental study of gas-liquid two-phase bubbly flow characteristics in a static mixer with three twisted leaves
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pISSN: 0256-1115 eISSN: 1975-7220
INVITED REVIEW PAPER
INVITED REVIEW PAPER
Experimental study of gas-liquid two-phase bubbly flow characteristics in a static mixer with three twisted leaves Huibo Meng*, Yuning Hao*, Yanfang Yu*,†, Zhonggen Li*, Shuning Song**, and Jianhua Wu* *Liaoning Key Laboratory of Chemical Technology for Efficient Mixing, Shenyang University of Chemical Technology, Shenyang 110142, P. R. China **School of Chemistry and Molecular Bioscience, The University of Queensland, Brisbane 4067, Australia (Received 17 March 2020 • Revised 15 May 2020 • Accepted 8 June 2020) AbstractUnder the conditions of liquid phase inlet Re ranging from 9,836 to 56,206 and gas fraction α from 4.76% to 66.67%, gas-liquid two-phase bubbly flow was investigated in a static mixer with three twisted leaves (TKSM) with a diameter of 100 mm and an aspect ratio of 1.5. A high-speed camera Revealer-2F04M with a resolution of 1,920×1,080 pixels was used to capture the evolution of bubble groups at the different axial windows of mixer elements. The results show that the flow pattern in the TKSM is still in bubbly flow at the flow rate of continuous phase QL no more than 1.0 m3/h and gas fraction α higher up to 54.55%-66.67%. The Sauter mean diameter d32 of bubble groups gradually decreased with the increase of the mixing elements number. With the given liquid flow rate QL 1.0 m3/h, the Sauter mean diameter d32 firstly decreased and then increased with the increase of gas flow rate. The local minimum of d32 was obtained at QG=0.72 m3/h and 84.5% of the dB/D0 is in the range of 0.02-0.05. The relationship among Sauter mean diameter, the inner diameter and the non-dimensional residence time satisfies the correlation We0.35 ·d32/D0 =0.026 0.17. Keywords: Static Mixer, Gas-liquid Two-phase, Flow Pattern, Sauter Mean Diameter, Dimensionless Residence Time
cially for many years. KSM consists of a series of left and right-hand helical blades which are alternatively arranged and have been given a twist angle of 90o-180o [8]. Hobbs et al. [9] numerically studied the three-dimensional chaotic mixing characteristics in the KSM. They found that the static mixer elements with twist angle of 120o produced more energy efficiency than standard KSM [10,11]. Kumar et al. [12] conducted numerical research on the pressure drop in KSM under a range of Re=1-25,000. At higher Re with a range of 10,000-25,000, the pressure drop across the KSM increased significantly. Zidouni et al. [13] numerically studied the axial and radial gas phase distribution in the KSM under different initial bubble sizes (3, 5.8 and 8 mm). The effects of Re number, Weber number and number of mixing elements on the Fanning friction were evaluated by Haddadi et al. [14], who found that the Sauter mean diameter decreased with the increasing of Weber and mixing elements number. The KSM also plays an important role in environmental protection. Tajima et al. [15] proposed a new method for ocean sequestration of the anthropogenic CO2 by using a KSM. They experimentally ex
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