包含在平行圆盘之间挤压的可移动的陀螺微生物的纳米流体

IF 4.2 Q2 NANOSCIENCE & NANOTECHNOLOGY
Jada Prathap Kumar, J. Umavathi, A. S. Dhone
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引用次数: 0

摘要

用于纳米/微电子器件的先进纳米和微技术在过去几年中取得了实质性进展。这些技术正在迅速融合先进的流体介质,如纳米流体和生物微生物。受生物纳米流体在医学、生物系统和生物技术等领域应用的启发,建立了非定常生物对流纳米流体的数学模型。下盘和上盘均为固体。利用纳米颗粒的随机运动和热泳参数改善了温度场。纳米生物转移模型被写为一系列非线性偏微分方程,这些偏微分方程通过适当的变换被简化为一组常微分方程。利用MATLAB bvp4c求解器软件包,采用rk -4阶格式对无量纲问题进行数值求解,研究挤压参数、哈特曼数、布朗运动和热泳参数对运动微生物速度、温度、纳米颗粒浓度和密度的影响。计算了摩擦系数、努塞尔数、舍伍德数和微生物数量在哈特曼数、热电泳和布朗运动因子上的分布。纳米粒子的布朗运动和热泳动因子导致吸入和注射时温度分布的增加。在布朗参数下,注射时浓度和活动微生物均增大,而在吸力下浓度和活动微生物均减小,热泳参数则相反。利用热泳参数对活动微生物进行吸、注气。吸入和喷射对磁盘的传递特性有不利影响。磁阻体力在核心区盛行,导致速度下降。磁性纳米颗粒可以成功地去除带有活动微生物的挤压膜中产生的热量,这需要润滑系统和生物医疗系统的更长的使用寿命,并且需要更少的维护和更长的使用寿命。这一发现与结合纳米流体和生物对流现象的新型生物微系统有关。计算热量、质量和微生物输送率的百分比增加。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Nanofluid containing motile gyrotactic microorganisms squeezed between parallel disks
Advanced nano and microtechnologies for nano/micro-electronic devices have made substantial advances in the past few years. These technologies are rapidly incorporating advanced fluid media such as nanofluids and biological microorganisms. Inspired by bio-nanofluid applications in medicine, biological systems and biotechnology in the present study, mathematical model is evolved for unsteady bio convective conducting nanofluid along with gyrotactic micro-organisms squeezed between parallel disks. The lower disk and upper disks are solids. The temperature field is improved by the methods of haphazard motion of nanoparticles and thermophoresis parameters. The nano-bio transfer model is written as a series of non-linear partial differential equations that are reduced into a set of ordinary differential equations using suitable transforms. The dimensionless problem is then numerically solved by RK-4th order scheme utilizing MATLAB bvp4c solver’s package to investigate the impact of the squeezing parameter, Hartman number, Brownian motion and thermophoresis parameter on motile microorganism velocity, temperature, nanoparticle concentration, and density. The friction factor, Nusselt number, Sherwood number and microorganism number distributions on Hartman number, thermophoresis and Brownian motion factors are also computed. The Brownian motion and the thermophoresis factors of nanoparticles cause an increment in temperature profiles for both suction and injection. The concentration and motile microorganism are both amplified for the Brownian parameter in the case of injection, whereas they are declined for suction and the opposite trend is observed for the thermophoresis parameter. The motile microorganism is deflated for both suction and injection with thermophoresis parameter. Suction and injection adversely affect the transfer properties at the disks. The resistive magnetic body force prevails in the core zone, resulting in a decrease in velocity. The heat generation in squeeze films with motile microorganisms can be successfully removed with magnetic nanoparticles which require a longer serviceability of the lubrication system, bio-medical systems and need for less maintenance and a longer lifespan approach. The finding is pertinent to novel bio-microsystems that combine nanofluid and the bioconvection phenomenon. The percentage increase in heat, mass, and microorganism transport rates is calculated.
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来源期刊
CiteScore
6.00
自引率
1.70%
发文量
24
期刊介绍: Proceedings of the Institution of Mechanical Engineers Part N-Journal of Nanomaterials Nanoengineering and Nanosystems is a peer-reviewed scientific journal published since 2004 by SAGE Publications on behalf of the Institution of Mechanical Engineers. The journal focuses on research in the field of nanoengineering, nanoscience and nanotechnology and aims to publish high quality academic papers in this field. In addition, the journal is indexed in several reputable academic databases and abstracting services, including Scopus, Compendex, and CSA's Advanced Polymers Abstracts, Composites Industry Abstracts, and Earthquake Engineering Abstracts.
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