Entropy generation and heat transfer analysis of alumina and carbon nanotubes based hybrid nanofluid inside a cavity
P. Sreedevi, P. Sudarsana Reddy
Abstract
Abstract This article presents numerical investigation of heat transport, flow and entropy generation features of hybrid nanofluid, made up of Aluminum oxide, single – walled carbon nanotubes as nanoparticles and Ethylene glycol as base fluid, inside a square cavity. The resultant non-dimensional equations are numerically assessed by employing finite difference technique. The variations in the scatterings of isotherms, streamlines and entropy generation with diverse values of radiation parameter <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" overflow="scroll"> <mml:mo stretchy="false">(</mml:mo> <mml:mn>0.01</mml:mn> <mml:mo>≤</mml:mo> <mml:mi mathvariant="normal">R</mml:mi> <mml:mo>≤</mml:mo> <mml:mn>0.1</mml:mn> <mml:mo stretchy="false">)</mml:mo> <mml:mo>,</mml:mo> </mml:math> volume fraction of parameter of alumina nanoparticle <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" overflow="scroll"> <mml:mo stretchy="false">(</mml:mo> <mml:mn>0.01</mml:mn> <mml:mo>≤</mml:mo> <mml:mi>ϕ</mml:mi> <mml:mn>2</mml:mn> <mml:mo>≤</mml:mo> <mml:mn>0.1</mml:mn> <mml:mo stretchy="false">)</mml:mo> </mml:math> Prandtl number <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" overflow="scroll"> <mml:mo stretchy="false">(</mml:mo> <mml:mn>5.2</mml:mn> <mml:mo>≤</mml:mo> <mml:mi mathvariant="normal">Pr</mml:mi> <mml:mo>≤</mml:mo> <mml:mn>8.2</mml:mn> <mml:mo stretchy="false">)</mml:mo> <mml:mo>,</mml:mo> </mml:math> Rayleigh number <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" overflow="scroll"> <mml:mo stretchy="false">(</mml:mo> <mml:msup> <mml:mrow> <mml:mn>10</mml:mn> </mml:mrow> <mml:mrow> <mml:mn>4</mml:mn> </mml:mrow> </mml:msup> <mml:mo>≤</mml:mo> <mml:mrow> <mml:mi mathvariant="normal">Ra</mml:mi> </mml:mrow> <mml:mo>≤</mml:mo> <mml:msup> <mml:mrow> <mml:mn>10</mml:mn> </mml:mrow> <mml:mrow> <mml:mn>5</mml:mn> </mml:mrow> </mml:msup> <mml:mo stretchy="false">)</mml:mo> <mml:mo>,</mml:mo> </mml:math> volume fraction parameter of single—walled carbon nanotubes <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" overflow="scroll"> <mml:mo stretchy="false">(</mml:mo> <mml:mn>0.01</mml:mn> <mml:mo>≤</mml:mo> <mml:mi>ϕ</mml:mi> <mml:mn>1</mml:mn> <mml:mo>≤</mml:mo> <mml:mn>0.1</mml:mn> <mml:mo stretchy="false">)</mml:mo> </mml:math> and magnetic parameter <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" overflow="scroll"> <mml:mfenced close=")" open="(" separators=""> <mml:mrow> <mml:mn>0.1</mml:mn> <mml:mo>≤</mml:mo> <mml:mi mathvariant="normal">M</mml:mi> <mml:mo>≤</mml:mo> <mml:mn>0.7</mml:mn> </mml:mrow> </mml:mfenced> </mml:math> have schemed through graphs. Rate of heat transfer augments from 8.2% to 17.6% in the case single—walled carbon nanotubes of volume fraction 0.05 are suspending into the base fluid, whereas, heat transfer rate rises from 8.2% to 12.4% in the case of alumina nanoparticles of volume fraction 0.05 are suspending into the base fluid.