Abstract
The object of research is the hydrodynamics of the boundary layer of the nozzle element of the proposed design. In the course of the study, computer simulation methods were used in the ANSYS environment, in particular the CFX block, which includes a set of physical, mathematical and numerical methods designed to calculate the characteristics of streaming processes. The analysis of the influence of the fluid velocity in the packed bed bioreactor on the magnitude of the hydraulic resistance for the following values of the fluid velocity: 0.1 m/s; 1 m/s; 2 m/s. The obtained data almost repeat the value of experimental studies, confirms the correctness of the construction of a computer model. A simulation of the hydrodynamics of a single nozzle of the proposed design for a longitudinal and transverse flow of fluid is done. Changes in the hydraulic resistance during transverse flow around the nozzle are insignificant, the maximum value lies within 101.3 kPa, for longitudinal washing the value of the pressure differential lies in the range from 98.96 to 102.7 kPa. Diagrams of the distribution of fields and velocity vectors in the boundary layer of the nozzle are obtained. When transversal washing of the nozzle, the magnitude of the velocities is in the range from 0 to 1.511 m/s, for longitudinal washer it ranges from 0 to 1.968 m/s. The distribution of the shear rate in the boundary layer is established, for the transverse washing of the nozzle, the magnitude of the shear flow rate ranges from 3.1 to 4.27·103 s-1, for a longitudinal washing of the nozzle, this indicator ranges from 5.6 to 1.25·104 s-1. Through the use of the proposed nozzle, it is possible to obtain large specific surface areas for the immobilization of microorganisms, provided that the critical parameters of the cultivation process are in accordance with permissible maximum deviations. Compared with the methods of determining the optimal parameters experimentally, a computer model is proposed that provides the following advantages: a significant reduction in the material costs of introducing a new nozzle design and a quick optimization of the process parameters when the initial data changes.
Highlights
The use of developed heat and mass transfer surfaces, today, is widely used in various industries [1, 2]
Since the movement of fluid near the nozzle surface carries a purely laminar regime, it significantly affects heat and mass transfer, the object of research is the hydrodynamics of the boundary layer of the nozzle element of the proposed design
During transverse washing of the nozzle, the value of hydraulic resistance does not change and lies within the limits of 101.3 kPa, while for longitudinal washing the value of the pressure drop changes significantly and ranges from 98.96 kPa to 102.7 kPa (Fig. 4). This fact suggests that the location of the nozzle elements in the fluid flow should be predominantly transverse in nature, which will help reduce the hydraulic resistance of the nozzle layer
Summary
The use of developed heat and mass transfer surfaces, today, is widely used in various industries [1, 2]. Since the movement of fluid near the nozzle surface carries a purely laminar regime, it significantly affects heat and mass transfer, the object of research is the hydrodynamics of the boundary layer of the nozzle element of the proposed design. The aim of research is simulation of the hydrodynamics of the nozzle of the developed surface of the proposed design in the ANSYS environment. The establishment of hydrodynamic features near the nozzle of the proposed design will allow to establish the optimal parameters and evaluate the possibility of using the nozzles of the proposed design in packed bed mass transfer devices
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