MHD mixed convection analysis in an open channel by obstructed Poiseuille flow of non-Newtonian power law fluid

2016 ◽  
Author(s):  
Khan Md. Rabbi ◽  
Tawfiqur Rakib ◽  
Sourav Das ◽  
Satyajit Mojumder ◽  
Sourav Saha
Keyword(s):  
Mixed Convection ◽  
Power Law ◽  
Poiseuille Flow ◽  
Open Channel ◽  
Power Law Fluid

MHD mixed convection analysis of non-Newtonian power law fluid in an open channel with round cavity

2017 ◽  
Author(s):  
Pritom Bose ◽  
Tawfiqur Rakib ◽  
Sourav Das ◽  
Khan Md. Rabbi ◽  
Satyajit Mojumder
Keyword(s):  
Mixed Convection ◽  
Power Law ◽  
Open Channel ◽  
Power Law Fluid

Augmentation of Pure Mixed Convection Heat Transfer in a Non-newtonian Power-law Fluid Filled Lid-driven Trapezoidal Cavity with Double Rotating Cylinders

2021 ◽  
Author(s):  
Hasib Ahmed Prince ◽  
Didarul Ahasan Redwan ◽  
Enamul Hasan Rozin ◽  
Sudipta Saha ◽  
Mohammad Arif Hasan Mamun
Keyword(s):  
Heat Transfer ◽  
Nusselt Number ◽  
Mixed Convection ◽  
Numerical Investigation ◽  
Power Law ◽  
Convection Heat Transfer ◽  
Cavity Surface ◽  
Rotating Cylinders ◽  
Power Law Fluid ◽  
Driven Cavity

Abstract In this study, a numerical investigation on mixed convection inside a trapezoidal cavity with a pair of rotating cylinders has been conducted. Three different power-law fluid indexes (n = 1.4, 1.0, and 0.6) have been considered to model different sets of non-Newtonian fluids. Four separate cases are considered dependent on the rotation orientation of the cylinders within the cavity. In the first two cases, the cylinders rotate in the same direction, i.e., both counter-clockwise (CCW), and both clockwise (CW), whereas, in the other two cases, cylinders rotate in opposite directions (CW-CCW and CCW-CW). Simulations have been carried out over a broad range of Reynolds number (from 0.5 to 500) and angular speeds (a dimensionless value from 0 to 10). The average Nusselt number values at the isothermal hot inclined cavity surface are determined to evaluate heat transfer performance in various circumstances. Streamlines and isotherm contours are also plotted for better understandings of the effects of different cases for various parameters on thermal and fluid flow fields. It is found that the Nusselt number varies non-linearly with different angular speeds of the cylinders. The combined effect of the mixing induced by cylinder rotation and viscosity characteristics of the fluid dictates the heat transfer in the system. Predictions from the numerical investigation provide insights onto the sets of key parametric configuration that have dominant influence on the thermal performance of lid driven cavity with double rotating cylinders.

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