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1. Professor Zhao Bingtaos team from Shanghai University of Technology: Fluid dynamics machine for enhancing interphase mass transfer effect by gas-phase swirling flow

The research conducted by Professor Zhao Bingtaos team at Shanghai University of Technology has revealed the fluid dynamics mechanism of enhancing interfacial mass transfer through multidimensional shear effects in gas-phase swirling flow. It was found that swirling flow is significantly better than conventional axial flow in terms of energy loss, velocity gradient, and turbulent kinetic energy distribution. A semi empirical model was established to quantify its flow characteristic parameters.. The following is the specific content: Research background and purpose Background: Rotating flow (swirl) has been proven to enhance the transfer process between heterogeneous phases, but its basic principles and physical mechanisms are not yet clear, which limits the application of counter current swirl theory in multiphase flow, mass transfer, reaction and separation fields. Objective: To reveal the multidimensional shear effect and its essence of improving interphase mass transfer in a countercurrent gas-liquid contact reactor through gas-phase swirling flow from the perspective of fluid dynamics. Figure 1. Multidimensional research method and experimental condition method for enhancing gas-liquid mass transfer process using gas-phase swirling flow: a combination of experimental research and numerical simulation based on CFD Reynolds stress model is adopted. Experimental conditions: Operating flow range of 50? 250 L/min (characteristic Reynolds number Re=1.18? 5.90×10? ）Compare the physical process parameters of gas-phase swirling flow and convent

ional axial flow in a countercurrent contact reactor. Key findings and conclusions: Energy loss increases with gas flow rate, and the Euler number Eu remains stable at 2.49 ± 0.17, which is 21.05% higher than conventional axial flow. Velocity and pressure distribution: Cyclones exhibit higher magnitudes and gradients in the distribution of static pressure, tangential velocity, axial velocity, and turbulent kinetic energy, which are directly related to enhanced interfacial contact, mixing, and mass transfer processes. Tangential velocity: The maximum tangential velocity of the vortex is significantly higher than that of conventional axial flow, and its radial occurrence position is closer to the center of the reactor, forming a stronger shear effect. Axial velocity: The axial velocity distribution of the vortex is more uniform, reducing the flow dead zone and improving the overall mass transfer efficiency. Turbulent kinetic energy: The turbulent kinetic energy distribution of swirling flow is wider, enhancing the turbulent mixing ability of the fluid and promoting interphase mass transfer. Figure 2. Cloud map and comparison of attenuation behavior and multidimensionality of tangential velocity distribution of swirl and axial flow in a countercurrent gas-liquid contact reactor: There is attenuation behavior in the axial flow process of swirl, but it also has multidimensionality (increased tangential dimension), which is a key element for process intensification that conventional axial flow does not possess. Semi empirical model: A semi empirical model was established to characterize the flow characteristic parameters such as the maximum tangential velocity of the vortex and its radial occurrence position. The determination

Vortex Flow | What are the brands of treadmills suitable for long-distance running | Rotameter Flow Meter

1. Professor Zhao Bingtaos team from Shanghai University of Technology: Fluid dynamics machine for enhancing interphase mass transfer effect by gas-phase swirling flow

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