Abstract

Oxygen mass transfer coefficient (k_La) is a key parameter in biochemical, photochemical, or other reactors. Pulsed plate column (PPC) has a potential application as a gas-liquid contactor. In the present work, TiO₂ nanofluid mediated oxygen mass transfer intensification in PPC is studied. The pulsing velocity (A × f) and nanoparticle loading in volume percent (Φ) have an interacting effect on k_La. The effect of Φ on k_La, showed a dual regime of an increase in k_La with an increase in Φ up to a critical loading (Φ_CL) and decrease in k_La on further increase in Φ. The effect of (A × f) on k_La showed three regimes. Φ_CL & k_La were found to decrease as the nanoparticle's size increased. Dimensionless correlations based on multiple regression analysis and ANN models were developed to predict the k_La values in PPC with TiO₂ nanofluids.

摘要

氧传质系数 (k _L a) 是生化、光化学或其他反应器中的关键参数。脉冲板塔 (PPC) 具有作为气液接触器的潜在应用。在目前的工作中，研究了 PPC 中TiO ₂纳米流体介导的氧传质强化。脉冲速度 (A × f) 和纳米颗粒的体积百分比 (Φ) 负载对 k _L a有相互作用影响。Φ 对 k _L a 的影响显示出 k _L a 增加与 Φ 增加直至临界载荷 (Φ _CL ) 和 k _L a 在 Φ 进一步增加时减少的双重机制。(A × f) 对 k _L a 的影响显示出三种状态。Φ _CL发现&k _L a 随着纳米颗粒尺寸的增加而降低。开发了基于多元回归分析和人工神经网络模型的无量纲相关性来预测具有 TiO ₂纳米流体的PPC 中的 k _L a 值。