An effect of the tubular baffles configuration in an agitated vessel with a high-speed impeller on the power consumption

Abstract

The results of the power consumption for an agitated vessel equipped with vertical tubular baffles and high-speed impeller are presented in the paper. Aqueous solutions of CMC were agitated within transitional range of the non-Newtonian liquid flow in the agitated vessel of inner diameter equal to 0.6 m. Eight different types of the impellers were tested: Rushton or Smith turbines, turbine with straight blades, pitched blade turbines and propeller. The J tubular baffles of outer diameter B were located in the position e from the vessel wall. Different configurations of baffles, arranged around the vessel circumference singularly or blocked in the modules, were considered in the study. In total, 180 different tubular baffles–impeller systems were tested. The measurements of the torque were conducted by means of the strain gauges method. Based on the power characteristics obtained for each impeller type, the effect of the geometrical parameters of the vertical tubular baffles on the power number was determined and discussed. The results show that geometry of the tubular baffles mostly affects the power number for the system with radial flow Rushton turbine. Moreover, power numbers decrease with the increase of the clearance between baffle and vessel wall for the systems, in which the radially axial circulation of the liquid is promoted. The dependences of the power number on the geometrical parameters of the vertical tubular baffles arranged singularly around the vessel circumference were described by means of the Eqs. (5)–(16). These equations can be useful in the project computations.

Experimental and hydrodynamic methods to determine aqueous dispersion of discontinuous reclaimed carbon fibres

“…However, the design of the vessel, baffles, and the number and shape of the mixing blades are critical to achieve the desired level of dispersion. 36,37 The practical fibre dispersion was experimentally observed as shown in Figure 12; the vertical axis indicates the fibre dispersion in an arbitrary unit. Fibre dispersion per unit volume with respect to crowding factor implies how much fibre suspension was achieved per unit volume by observing a 3-dimensional volume vessel.…”

Mixing Efficiency of Viscous Fluid in a Multiple‐Impeller Agitated Tank

“…The data showed that C 1 values for the middle regime followed the order 6-flat-blade turbine > 4-pitched-blade turbine > 3-blade propeller systems. For axial and radial triple impeller systems, this relationship is accurate [38][39][40]. In the late transition regime, the data showed that the g values of the 6-flat-blade turbine are higher than those of the 4-pitched-blade turbine; the power number values of the 3-blade propeller remain essentially unchanged [41].…”

Roteiro de projeto de chicana tubular vertical em tanques agitados com turbina Rushton / Project roadmap for vertical tubular baffle in agitated tanks with Rushton turbine

“…O consumo de energia em tanques agitados com turbinas Rushton de fluxo radial depende da geometria das chicanas e da folga entre esta e a parede do tanque, onde ocorre a circulação do líquido [10]. Para fluidos Newtonianos, o projeto de um tanque depende da potência fornecida pelo motor que será em função das propriedades físicas dos fluidos e das variáveis geométricas do sistema (tanque, impulsor e trocador de calor).…”

“…O diferencial da energia total no volume de controle, pode ser reescrita na Equação (10) pelo diferencial da energia interna, cinética e potencial em função do tempo. comparadas com a energia interna, a Equação (10) passa a ser representada na Equação (11).…”