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<p>Microalgae cultivation is a field with significant potential across various industries, such as pharmaceuticals, food, cosmetics, and energy. Aiming to optimize the geometric parameters of a paddlewheel agitation system through computational fluid dynamics (CFD) and experimental validation, an investigation was conducted involving different rotation speeds, blade pitch angles, and the number of blades on a paddlewheel within a microalgae cultivation tank. The results revealed paddlewheels with 90° inclined blades exhibited higher average flow velocities. Regarding the vertical mixing index, the 8-blade paddlewheels demonstrated inferior performance compared to systems with four and six blades. A pitch angle of 60° minimized power consumption. The optimal configuration found was a 60°-angled 4-blade paddlewheel, operating at a rotation speed of 19&#xa0;rpm, yielding the highest mixing performance index value at 46.12 W<sup>−1</sup>. The straight blades operated at 13&#xa0;rpm could not sustain microalgae suspension. For 60° inclined blades, all tested rotations achieved a high level of suspension.</p>

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Influence of paddlewheel geometry on hydrodynamic performance and energy consumption in microalgae cultivations in open raceway ponds

  • 期刊论文

  • 发表日期：

    2025年4月23日

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  • Gabriel de Morais Campos,
  • Natalia dos Santos Renato,
  • Victor Hugo Laviola de Oliveira,
  • Pedro Henrique de Moura Rodrigues,
  • Marcio Arêdes Martins

摘要

Microalgae cultivation is a field with significant potential across various industries, such as pharmaceuticals, food, cosmetics, and energy. Aiming to optimize the geometric parameters of a paddlewheel agitation system through computational fluid dynamics (CFD) and experimental validation, an investigation was conducted involving different rotation speeds, blade pitch angles, and the number of blades on a paddlewheel within a microalgae cultivation tank. The results revealed paddlewheels with 90° inclined blades exhibited higher average flow velocities. Regarding the vertical mixing index, the 8-blade paddlewheels demonstrated inferior performance compared to systems with four and six blades. A pitch angle of 60° minimized power consumption. The optimal configuration found was a 60°-angled 4-blade paddlewheel, operating at a rotation speed of 19 rpm, yielding the highest mixing performance index value at 46.12 W−1. The straight blades operated at 13 rpm could not sustain microalgae suspension. For 60° inclined blades, all tested rotations achieved a high level of suspension.