Feature of Entropy Generation in Cu-Al 2 O 3 /Ethylene Glycol Hybrid Nanofluid Flow Through a Rotating Channel
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Feature of Entropy Generation in Cu-Al2 O3 /Ethylene Glycol Hybrid Nanofluid Flow Through a Rotating Channel S. Das1 · S. Sarkar1 · R. N. Jana2
© Springer Science+Business Media, LLC, part of Springer Nature 2020
Abstract This paper aims to delineate the heat transfer enhancement and entropy generation of a magnetohydrodynamic (MHD) flow of a viscous incompressible electrically conducting non-Newtonian Casson hybrid nanofluid between two infinite parallel non-conducting plates channel in a rotating frame. Copper and aluminium oxide nanoparticles are dispersed in ethylene glycol (EG) as a base fluid. Casson model is deployed here to describe the constitutive behaviour of non-Newtonian fluids. The thermal radiation, viscous dissipation and Joule heating (Ohmic dissipation) effects are included in this model. Closedform solutions are obtained for constitutive equations. Graphs and tables are presented and illustrated to disclose the impact of significant flow parameters on the flow system. The shear stresses and the rate of heat transfer are discussed numerically, and their numerical values for pertinent physical parameters are tabulated. The total entropy generation rate and Bejan number are also discussed and their interpretations with the physical parameters are conferred via graphs. The results obtained from the parametric analysis manifest that the temperature field is boosted up due to the high intensity of magnetic field as well as Coriolis force. The intensification of magnetic parameter contributes to an increase in the rate of heat transfer at the channel walls. The entropy generation can be minimized by improving Casson parameter. Moreover, a comparison between the flows of Casson hybrid nanofluid (Cu-Al2 O3 /EG) and Casson nanofluid (Cu-EG) is reported. Minimization in entropy generation is achieved for Casson hybrid nanofluid in comparison with Casson nanofluid. Keywords MHD Casson hybrid nanofluid · Ethylene glycol(EG) · Porous channel · Rotating frame · Entropy generation · Bejan number
1 Introduction In the twenty-first century, we are greatly concerned with energy resources because of advanced and rapid technological and biomedical processes and devices. Thus, the research community shows their keen interest to discover new energy resources. Due to the increase of work frequency and heat flux of electronic systems, the dissipation of heat from it becomes a major concern of electronic component design. Miniaturization of electronic systems needs less heat dissipation from compact thermal devices. Effective heat transfer using a compact system S. Das
[email protected] 1
Department of Mathematics, University of Gour Banga, Malda, 732 103, India
2
Department of Applied Mathematics, Vidyasagar University, Midnapore, 721 102, India
is essential for modern thermal management systems, especially for cooling application of CPUs, LEDs, rectifiers, thyristors, transistors, travelling wave collectors, audio and RF amplifiers and high-density semiconductors. To achieve this, the improvement of therma
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