Applied Mathematics and Mechanics (English Edition) ›› 2018, Vol. 39 ›› Issue (5): 623-638.doi: https://doi.org/10.1007/s10483-018-2331-6

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3D Casson nanofluid flow over slendering surface in a suspension of gyrotactic microorganisms with Cattaneo-Christov heat flux

V. NAGENDRAMMA1, C. S. K. RAJU2, B. MALLIKARJUNA3, S. A. SHEHZAD4, A. LEELARATHNAM1   

  1. 1. Department of Mathematics, SPMVV University, Tirupati 517502, India;
    2. Department of Mathematics, GITAM University, Bangalore 562163, India;
    3. Department of Mathematics, BMS College of Engineering, Bangalore 560019, India;
    4. Department of Mathematics, COMSATS Institute of Information Technology, Sahiwal 57000, Pakistan
  • 收稿日期:2017-09-18 修回日期:2017-11-16 出版日期:2018-05-01 发布日期:2018-05-01
  • 通讯作者: S.A.SHEHZAD,E-mail:ali qau70@yahoo.com E-mail:ali qau70@yahoo.com

3D Casson nanofluid flow over slendering surface in a suspension of gyrotactic microorganisms with Cattaneo-Christov heat flux

V. NAGENDRAMMA1, C. S. K. RAJU2, B. MALLIKARJUNA3, S. A. SHEHZAD4, A. LEELARATHNAM1   

  1. 1. Department of Mathematics, SPMVV University, Tirupati 517502, India;
    2. Department of Mathematics, GITAM University, Bangalore 562163, India;
    3. Department of Mathematics, BMS College of Engineering, Bangalore 560019, India;
    4. Department of Mathematics, COMSATS Institute of Information Technology, Sahiwal 57000, Pakistan
  • Received:2017-09-18 Revised:2017-11-16 Online:2018-05-01 Published:2018-05-01
  • Contact: S.A.SHEHZAD E-mail:ali qau70@yahoo.com

摘要:

A mathematical model is proposed to execute the features of the non-uniform heat source or sink in the chemically reacting magnetohydrodynamic (MHD) Casson fluid across a slendering sheet in the presence of microorganisms and Cattaneo-Christov heat flux. Multiple slips (diffusion, thermal, and momentum slips) are applied in the modeling of the heat and mass transport processes. The Runge-Kutta based shooting method is used to find the solutions. Numerical simulation is carried out for various values of the physical constraints when the Casson index parameter is positive, negative, or infinite with the aid of plots. The coefficients of the skin factors, the local Nusselt number, and the Sherwood number are estimated for different parameters, and discussed for engineering interest. It is found that the gyrotactic microorganisms are greatly encouraged when the dimensionless parameters increase, especially when the Casson fluid parameter is negative. It is worth mentioning that the velocity profiles when the Casson fluid parameter is positive are higher than those when the Casson fluid parameter is negative or infinite, whereas the temperature and concentration fields show exactly opposite phenomena.

关键词: Casson fluid, Stroh’s formalism, eigenvalue, stress intensity factors, microorganisms, Cattaneo-Christov heat flux, slendering sheet, multiple slip

Abstract:

A mathematical model is proposed to execute the features of the non-uniform heat source or sink in the chemically reacting magnetohydrodynamic (MHD) Casson fluid across a slendering sheet in the presence of microorganisms and Cattaneo-Christov heat flux. Multiple slips (diffusion, thermal, and momentum slips) are applied in the modeling of the heat and mass transport processes. The Runge-Kutta based shooting method is used to find the solutions. Numerical simulation is carried out for various values of the physical constraints when the Casson index parameter is positive, negative, or infinite with the aid of plots. The coefficients of the skin factors, the local Nusselt number, and the Sherwood number are estimated for different parameters, and discussed for engineering interest. It is found that the gyrotactic microorganisms are greatly encouraged when the dimensionless parameters increase, especially when the Casson fluid parameter is negative. It is worth mentioning that the velocity profiles when the Casson fluid parameter is positive are higher than those when the Casson fluid parameter is negative or infinite, whereas the temperature and concentration fields show exactly opposite phenomena.

Key words: multiple slip, Stroh’s formalism, eigenvalue, stress intensity factors, Cattaneo-Christov heat flux, microorganisms, slendering sheet, Casson fluid

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