Abstract

A novel efficiency reduction model to tubular heat exchanger based on heat transfer losses by biofilm adhesion is proposed, which included a modified equation based on the real data-dependent time, seawater, hydrodynamics and heat transfer resistance using computational fluid dynamics (CFD). The biofilm growth model based on Verhulst model and experimental data has been obtained and simulated in a CFD software tool to analyze the tubular heat exchanger performance prediction cooled by seawater. The biofilm CFD model with appropriate fit, and the correlation coefficient (R2) values are between 0.97 and 0.99, was validated by experimental data obtained at different flow velocity. The final results of in/outlet difference temperatures were from 3.9 °C to 2.2 °C for different flow velocity with R2 > 0.97. The simulation results demonstrate that the novel CFD model is capable of predicting the efficiency losses during the development period of biofilm growth in in open-loop cooling seawater systems.

摘要

提出了一种基于生物膜粘附传热损失的新型管式换热器效率降低模型，其中包括使用计算流体动力学 (CFD) 的基于真实数据相关时间、海水、流体动力学和传热阻力的修正方程。获得了基于 Verhulst 模型和实验数据的生物膜生长模型，并在 CFD 软件工具中进行了模拟，以分析海水冷却的管式换热器性能预测。通过在不同流速下获得的实验数据验证了具有适当拟合的生物膜CFD模型，并且相关系数（R2）值在0.97和0.99之间。对于不同的流速，R2 > 0.97，进/出口温差的最终结果为 3.9 °C 至 2.2 °C。