Thermal and entropy generation of non-Newtonian magneto-Carreau fluid flow in microchannel

• Published in: Journal of thermal analysis and calorimetry Vol. 143; no. 3; pp. 2717 - 2727
• Main Authors: Shehzad, S. A., Madhu, Macha, Shashikumar, N. S., Gireesha, B. J., Mahanthesh, B.
• Format: Journal Article
• Language: English
• Published: Cham Springer International Publishing 01-02-2021; Springer; Springer Nature B.V
• Subjects: Analytical Chemistry; Chemistry; Chemistry and Materials Science; Computational fluid dynamics; Electronic devices; Entropy; Finite element method; Fluid flow; Heat; Heat exchangers; Heat transfer; Heat transmission; Inorganic Chemistry; Measurement Science and Instrumentation; Micro air vehicles (MAV); Microchannels; Ohmic dissipation; Optimization; Physical Chemistry; Polymer Sciences; Resistance heating; Velocity distribution; Carreau fluid; Bejan number; Microchannel; Magnetic field; Entropy generation
• ISSN: 1388-6150; 1588-2926
• DOI: 10.1007/s10973-020-09706-8

The heat flow in microchannels can be established in numerous applications such as micro air vehicles, mechanical–electromechanical systems, cooling of electronic devices and micro heat exchanger systems. Heat flow optimization deliberates the function of entropy generation minimization (EGM) in engineering applications. Hence, this paper investigates the heat transport of non-Newtonian magneto-Carreau fluid in a microchannel with EGM. Mathematical modeling incorporates the Carreau fluid model. Further, viscous heating, Joule heating and convective heating aspects are also analyzed. The physical features of entropy production in the flow of non-Newtonian Carreau fluid in a microchannel are the major focus of this model. Dimensionless variables are executed for the simplicity of basic equations. The subsequent system is treated by using finite element method. Behaviors of effective parameters on velocity, Bejan number, entropy generation rate and temperature are interpreted. It is established that EGM is occurred for larger values of Weissenberg number. The Carreau fluid exponent is positively related to Bejan number, whereas it is negatively related to EG, temperature and velocity fields.