Laminar Mixed Convection Flow of Cu–Water Nanofluid in a Vertical Channel with Viscous Dissipation

2018 ◽  
pp. 637-648
Author(s):  
Surender Ontela ◽  
Lalrinpuia Tlau ◽  
D. Srinivasacharya
Keyword(s):  
Mixed Convection ◽  
Viscous Dissipation ◽  
Vertical Channel ◽  
Convection Flow ◽  
Mixed Convection Flow ◽  
Laminar Mixed Convection

scholarly journals Bistable fully developed mixed convection flow with viscous dissipation in a vertical channel

2018 ◽  
Vol 5 (7) ◽  
pp. 171880
Author(s):  
M. Miklavčič
Keyword(s):  
Mixed Convection ◽  
Thermal Radiation ◽  
Pressure Gradient ◽  
Viscous Dissipation ◽  
Vertical Channel ◽  
Convection Flow ◽  
Mixed Convection Flow ◽  
Radiation Model ◽  
Stable Solutions ◽  
Stable Flow

It is shown that unstable dual solutions in fully developed mixed convection flow in a vertical channel disappear in the presence of relatively strong thermal radiation. In this case, we have a unique stable flow at each pressure gradient. When the effect of thermal radiation is weak another branch of stable solutions is created, resulting in bistable flows. In this case, the flow exhibits hysteresis with variation of the pressure gradient. Optically, a thin radiation model is used.

Coupled Thermal Radiation and Mixed Convection Step Flow of Nongray Gas

2016 ◽  
Vol 138 (7) ◽  
Author(s):  
M. Atashafrooz ◽  
S. A. Gandjalikhan Nassab ◽  
K. Lari
Keyword(s):  
Mixed Convection ◽  
Radiative Transfer Equation ◽  
Convection Flow ◽  
Mixed Convection Flow ◽  
Discrete Ordinate ◽  
Full Spectrum ◽  
Step Flow ◽  
Laminar Mixed Convection ◽  
Gray Medium ◽  
Hydrodynamic Behaviors

The main goal of this paper is to analyze the thermal and hydrodynamic behaviors of laminar mixed convection flow of a nongray radiating gas over an inclined step in an inclined duct. The fluid is considered an air mixture with 10% CO2 and 20% H2O mole fractions, which is treated as homogeneous, absorbing, emitting, and nonscattering medium. The full-spectrum k-distribution (FSK) method is used to handle the nongray part of the problem, while the radiative transfer equation (RTE) is solved using the discrete ordinate method (DOM). In addition, the results are obtained for different medium assumptions such as pure mixed convection and gray medium to compare with the nongray calculations as a real case. The results show that in many cases, neglecting the radiation part in computations and also use of gray simulations are not acceptable and lead to considerable errors, especially at high values of the Grashof number in mixed convection flow.

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