Recent Publications by Amin Esmaeili

 

Our group has recently made new research progress in the hydrodynamic understanding of bubble column reactors operating with non-Newtonian liquids.

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1. For better design, optimization, and scale-up purposes of bubble columns operating under elevated pressure, Amin Esmaeili et.al investigated the simultaneous effects of liquid phase rheological properties and operating pressure in a pilot-scale bubble column reactor by means of analyzing global and local pressure data. They found that the total gas holdup increases with an increase in the operating pressure. The operating flow regime transition point was shifted to higher superficial gas velocities at elevated pressures. The standard deviation of pressure fluctuations was also found to increase with operating pressure but to decrease with the elasticity of the liquid phase. They developed a new correlation to predict the gas holdup in bubble columns operating at elevated pressures. Click to see the article

2. Amin Esmaeili and coworkers measured local bubble properties by placing two in-house made optical fiber probes at various locations within a bubble column reactor operating with different non-Newtonian liquids. They found that the presence of elasticity can noticeably increase the bubble frequency but decreases the bubble chord length and its rise velocity. The radial profiles of bubble frequency, bubble chord length and bubble rise velocity are shown to be relatively flat at low superficial gas velocity while they become parabolic at high superficial gas velocity. They proposed two novel correlations based on dimensionless numbers by introducing the dynamic moduli of the liquid phase into the correlations. The novel proposed correlations provides a reliable method to predict bubble size and gas holdup in bubble column reactors operating with non-Newtonian liquids with a wide range of viscosity and elasticity. Click to see the article

These works have been supported by TOTAL American Services, Inc. and the Natural Science and Engineering Research Council, Canada (NSERC).