Mixed convection hybrid nanofluids flow of MWCNTs–Al 2 O 3 /engine oil over a spinning cone with variable viscosity and thermal conductivity

Heat Transfer ◽  
2021 ◽  
Author(s):  
Ayele Tulu ◽  
Wubshet Ibrahim
Keyword(s):  
Thermal Conductivity ◽  
Mixed Convection ◽  
Variable Viscosity ◽  
Engine Oil ◽  
Hybrid Nanofluids

scholarly journals Mixed convection dissipative viscous fluid flow over a rotating cone by way of variable viscosity and thermal conductivity

2016 ◽  
Vol 6 ◽  
pp. 1126-1135 ◽  
Author(s):  
M.Y. Malik ◽  
Hamayun Jamil ◽  
T. Salahuddin ◽  
S. Bilal ◽  
K.U. Rehman ◽  
...  
Keyword(s):  
Thermal Conductivity ◽  
Fluid Flow ◽  
Viscous Fluid ◽  
Mixed Convection ◽  
Variable Viscosity ◽  
Viscous Fluid Flow ◽  
Rotating Cone

scholarly journals Mixed convection flow in a vertical channel in the presence of wall conduction, variable thermal conductivity and viscosity

2020 ◽  
Vol 9 (1) ◽  
pp. 412-431
Author(s):  
Abiodun O. Ajibade ◽  
Ayuba M. Umar
Keyword(s):  
Thermal Conductivity ◽  
Mixed Convection ◽  
Variable Viscosity ◽  
Reverse Flow ◽  
Plate Thickness ◽  
Vertical Channel ◽  
Critical Value ◽  
Convection Flow ◽  
Heated Plate ◽  
Mixed Convection Flow

AbstractThis study theoretically investigates the effects of variable viscosity, thermal conductivity and wall conduction on a steady mixed convection flow of heat generating/absorbing fluid passes through a vertical channel. One of the channel plates moves with a constant velocity while the other is stationary. The governing flow equations are solved analytically using homotopy perturbation method (HPM). The effects of the thermophysical and hydrodynamics parameters are captured in graphs and tables. It has been observed that, both the velocity and temperature distributions decrease with increase in viscosity and boundary plate thickness near the heated plate while a reverse cases were observed near the cold plate. Increase in thermal conductivity ε decreases the fluid flow near the heated plate. When the boundary plate thickness is increased, the critical value of Gre to onset the reverse flow increases while increase in thermal conductivity reduces the critical value of Gre. It’s also noticed that the skin friction and rate of heat transfer at the heated plate decrease with increase in boundary plate thickness d.

The Classical Plane Couette-Poiseuille Flow With Variable Fluid Properties

2006 ◽  
Vol 128 (5) ◽  
pp. 1115-1121 ◽  
Author(s):  
Asterios Pantokratoras
Keyword(s):  
Thermal Conductivity ◽  
Poiseuille Flow ◽  
Variable Viscosity ◽  
Volume Flow Rate ◽  
Variable Thermal Conductivity ◽  
Engine Oil ◽  
Large Temperature ◽  
Temperature Profiles ◽  
Straight Line ◽  
Classical Plane

A theoretical study of the effect of variable viscosity and variable thermal conductivity on the classical plane Couette-Poiseuille flow is presented in this brief communication. The investigation concerns engine oil, air, and water taking into account the variation of these quantities with temperature. The results are obtained with the numerical simulation of the governing equations and cover large temperature differences. Velocity and temperature profiles are presented as well as the volume flow rate and the heat flux between the plates. It is found that temperature profiles are close to the straight line for oil and water and depart significantly from the straight line for air due to nonlinear thermal conductivity. Dynamic viscosity plays an important role on the results which depart significantly from those of a fluid with constant properties.

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