Gravitation modulation impact on MHD free convection flow of micropolar fluid

IF 16.4 1区化学 Q1 CHEMISTRY, MULTIDISCIPLINARY

Accounts of Chemical Research Pub Date : 2020-12-30 DOI:10.3329/JNAME.V17I2.41742

S. Sengupta, R. Deb

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引用次数: 0

Abstract

Department of Mathematics, Assam University, Silchar, Assam, India, E-mail: sanjib_aus2009@rediffmail.com; Department of Mathematics, Assam University, Silchar, Assam, India, ,E-mail: reshmideb27@gmail.com Abstract In this paper, a theoretical study is carried out on unsteady three dimensional, laminar, free convection flow of micropolar fluid with Hall effect, Joule heating and heat sink under gravitation modulation. A uniform transverse magnetic field is applied normal to the plate along the fluid region. The magnetic Reynolds number is considered to be small due to incomparability of applied and induced magnetic fields, as such the influence of induced magnetic field can be neglected. The multi parameter perturbation technique is used to solve the governed dimensionless equations. The fluid velocity, temperature and the concentration profiles are discussed with the aid of graphs and tables. The coefficient of skin friction and couple stresses is numerically computed in addition to Nusselt number and Sherwood number. The result reveals that the linear velocity increases due to escalation in gravitation modulation parameter values but for intensification in values of gravitation modulation parameter, a reverse effect is observed for rotational velocity. A comparative analysis shows that skin friction coefficient is less in micropolar fluid than the corresponding Newtonian fluid.

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重力调制对微极流体MHD自由对流流动的影响

阿萨姆邦大学数学系，印度阿萨姆邦西尔查尔，E-mail: sanjib_aus2009@rediffmail.com;摘要本文对重力调制下具有霍尔效应、焦耳加热和热沉降的微极流体的非定常三维、层流、自由对流流动进行了理论研究。均匀的横向磁场沿流体区域垂直于平板。由于外加磁场和感应磁场的不可比性，认为磁雷诺数很小，可以忽略感应磁场的影响。采用多参数摄动技术求解控制无量纲方程。用图形和表格讨论了流体的速度、温度和浓度分布。除努塞尔数和舍伍德数外，还对表面摩擦系数和耦合应力进行了数值计算。结果表明，随着重力调制参数值的增大，线速度增大，而随着重力调制参数值的增大，旋转速度则相反。对比分析表明，微极流体的表面摩擦系数小于相应的牛顿流体。

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来源期刊

Accounts of Chemical Research 化学-化学综合

CiteScore

31.40

自引率

1.10%

发文量

312

审稿时长

2 months

期刊介绍： Accounts of Chemical Research presents short, concise and critical articles offering easy-to-read overviews of basic research and applications in all areas of chemistry and biochemistry. These short reviews focus on research from the author’s own laboratory and are designed to teach the reader about a research project. In addition, Accounts of Chemical Research publishes commentaries that give an informed opinion on a current research problem. Special Issues online are devoted to a single topic of unusual activity and significance. Accounts of Chemical Research replaces the traditional article abstract with an article "Conspectus." These entries synopsize the research affording the reader a closer look at the content and significance of an article. Through this provision of a more detailed description of the article contents, the Conspectus enhances the article's discoverability by search engines and the exposure for the research.