Numerical investigation of two dimensional natural convection and entropy generation inside a porous square enclosure with sinusoidally heated wall

2016 ◽  
Vol 16 (2) ◽  
pp. 88 ◽  
Author(s):  
Prashant Meshram ◽  
Saurabh Bhardwaj ◽  
Amaresh Dalal
Keyword(s):  
Natural Convection ◽  
Numerical Investigation ◽  
Entropy Generation ◽  
Heated Wall ◽  
Two Dimensional ◽  
Square Enclosure

Experimental and Numerical Investigation on Natural Convection Heat Transfer of TiO2–Water Nanofluids in a Square Enclosure

2013 ◽  
Vol 136 (2) ◽  
Author(s):  
Yanwei Hu ◽  
Yurong He ◽  
Shufu Wang ◽  
Qizhi Wang ◽  
H. Inaki Schlaberg
Keyword(s):  
Heat Transfer ◽  
Thermal Conductivity ◽  
Natural Convection ◽  
Numerical Investigation ◽  
Convection Heat Transfer ◽  
Distribution Functions ◽  
Lattice Boltzmann Model ◽  
Natural Convection Heat Transfer ◽  
Convection Heat ◽  
Square Enclosure

An experimental and numerical investigation on natural convection heat transfer of TiO2–water nanofluids in a square enclosure was carried out for the present work. TiO2–water nanofluids with different nanoparticle mass fractions were prepared for the experiment and physical properties of the nanofluids including thermal conductivity and viscosity were measured. Results show that both thermal conductivity and viscosity increase when increasing the mass fraction of TiO2 nanoparticles. In addition, the thermal conductivity of nanofluids increases, while the viscosity of nanofluids decreases with increasing the temperature. Nusselt numbers under different Rayleigh numbers were obtained from experimental data. Experimental results show that natural convection heat transfer of nanofluids is no better than water and even worse when the Rayleigh number is low. Numerical studies are carried out by a Lattice Boltzmann model (LBM) coupling the density and the temperature distribution functions to simulate the convection heat transfer in the enclosure. The experimental and numerical results are compared with each other finding a good match in this investigation, and the results indicate that natural convection heat transfer of TiO2–water nanofluids is more sensitive to viscosity than to thermal conductivity.

Numerical Investigation of the Entropy Generation Due to Natural Convection in a Partially Heated Square Cavity Filled With Nanofluids

2016 ◽  
Vol 38 (17) ◽  
pp. 1506-1521 ◽  
Author(s):  
Mohammad Mohammadtabar ◽  
Farshad Mohammadtabar ◽  
Rouholluh Shokri ◽  
Mohtada Sadrzadeh
Keyword(s):  
Natural Convection ◽  
Numerical Investigation ◽  
Entropy Generation ◽  
Square Cavity
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