Ahmad Sohail, Ashraf Muhammad, Ali Kashif
Centre for Advanced Studies in Pure and Applied Mathematics, Bahauddin Zakariya University, Multan, 60800, Pakistan.
Department of Basic Sciences and Humanities, Muhammad Nawaz Sharif University of Engineering and Technology, Multan, 60000, Pakistan.
Heliyon. 2020 Dec 25;6(12):e05832. doi: 10.1016/j.heliyon.2020.e05832. eCollection 2020 Dec.
The addition of gyrotactic microbes in the nanoparticles is essential to embellish the thermal efficiency of many systems such as microbial fuel cells, bacteria powered micro-mixers, micro-volumes like microfluidics devices, enzyme biosensor and chip-shaped microdevices like bio-microsystems. Porous media also plays a pivotal role in augmentation of the thermal efficiency. Our approach in the present work is to offer a novel study of bioconvection due to gyrotactic microbes in a nanofluid flow comprising thermal radiation within a porous media over a nonlinear shrinking/stretching surface. The entire coupled system involving nonlinear equations is tackled by means of Successive over Relaxation technique. The impacts of the involved parameters on the flow, motile microbes diffusion rate, mass and heat transfer rates are examined and shown through diagrams and tables. Comparisons with graphical and tabular data are provided and observed to be in a good agreement. Numerical results evidently point out that the motile microbes parameter and the bioconvection Peclet number elevate the motile microorganisms' density whereas the thermal radiation phenomenon enhances the temperature.
在纳米颗粒中添加趋旋微生物对于提高许多系统的热效率至关重要，这些系统包括微生物燃料电池、细菌驱动的微混合器、诸如微流控设备的微体积、酶生物传感器以及像生物微系统这样的芯片状微器件。多孔介质在提高热效率方面也起着关键作用。我们在当前工作中的方法是对纳米流体流动中由于趋旋微生物引起的生物对流进行一项新颖的研究，该纳米流体流动包含多孔介质内非线性收缩/拉伸表面上的热辐射。通过逐次超松弛技术解决涉及非线性方程的整个耦合系统。研究了相关参数对流动、活动微生物扩散率、质量和传热率的影响，并通过图表展示。提供了与图形和表格数据的比较，发现两者吻合良好。数值结果明显指出，活动微生物参数和生物对流佩克莱数提高了活动微生物的密度，而热辐射现象提高了温度。
