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Investigation of irreversibilities in a microchannel by differing viscosity, including buoyancy forces and suction/injection
Author(s) -
Venkatesh Puttaswmay,
Gireesha Bijjanal Jayanna,
Almeida Felicita
Publication year - 2021
Publication title -
heat transfer
Language(s) - English
Resource type - Journals
eISSN - 2688-4542
pISSN - 2688-4534
DOI - 10.1002/htj.22044
Subject(s) - biot number , buoyancy , nanofluid , mechanics , microchannel , materials science , viscosity , thermodynamics , heat transfer , composite material , physics
Single‐phase Poiseuille flow considering oxides of copper‐water nanoliquid in the upright microchannel with uneven viscosity causes the production of inbuilt irreversibility in the system. This is reported in the present investigation involving the buoyancy force with suction/injection at the walls by taking into account different shapes of nanoparticles. The equations so obtained being highly nonlinear is attempted to solve via Runge–Kutta–Fehlberg shooting scheme. Flow and heat transmission characteristics are explored by considering the nanoparticle's shape. The result exemplifies that the viscosity variation parameter escalates the flow profile as well as temperature profile. The thermal radiation and Biot number boost the let go of thermal energy, which leads to system cooling. The temperature profile for nanoparticle shape factor upholds the fact that temperature is high for lamina‐shaped nanoparticles and least for spherical‐shaped nanoparticles. Also, the Biot number, radiation parameter, and nanoparticle volume fraction serve in lowering the entropy, which augments the exergetic effectiveness of the system.