A Theoretical Study of Natural Convection of Water-Based Nanoliquids in Low-Porosity Enclosures Using Single-Phase Model

2018 ◽  
Vol 7 (1) ◽  
pp. 163-174 ◽  
Author(s):  
P. G. Siddheshwar ◽  
B. N. Veena
Keyword(s):  
Natural Convection ◽  
Single Phase ◽  
Theoretical Study ◽  
Phase Model ◽  
Water Based ◽  
Low Porosity

scholarly journals Unsteady natural convection in micropolar nanofluids

2014 ◽  
Vol 35 (3) ◽  
pp. 155-170 ◽  
Author(s):  
Kazimierz Rup ◽  
Konrad Nering
Keyword(s):  
Heat Transfer ◽  
Natural Convection ◽  
Single Phase ◽  
Volume Fraction ◽  
Cu Nanoparticles ◽  
Small Particles ◽  
The Third ◽  
Water Based ◽  
Momentum And Heat Transfer ◽  
Unsteady Natural Convection

Abstract This paper presents the analysis of momentum, angular momentum and heat transfer during unsteady natural convection in micropolar nanofluids. Selected nanofluids treated as single phase fluids contain small particles with diameter size 10-38.4 nm. In particular three water-based nanofluids were analyzed. Volume fraction of these solutions was 6%. The first of the analyzed nanofluids contained TiO2 nanoparticles, the second one contained Al2O3 nanoparticles, and the third one the Cu nanoparticles.

Optimization of Pulsating Heating in Pool Boiling

1997 ◽  
Vol 119 (2) ◽  
pp. 298-304 ◽  
Author(s):  
J. V. C. Vargas ◽  
A. Bejan
Keyword(s):  
Natural Convection ◽  
Single Phase ◽  
Theoretical Study ◽  
Thermal Conductance ◽  
Optimal Time ◽  
Time Interval ◽  
Heating Cycle ◽  
Excess Temperature ◽  
Time Intervals ◽  
Order Of Magnitude

This paper describes an experimental and theoretical study of the periodic on and off heating of water on a horizontal surface. The heat transfer is effected by natural convection and isolated bubbles. The experiments cover the heat flux range 33–154 kW/m2 and the wall excess temperature range 7–13°C. It is shown experimentally that the cycle-averaged thermal conductance between the surface and the pool can be maximized by properly selecting the time intervals of the on and off heating cycle. The maximum relative augmentation of the thermal conductance is approximately 15 percent. In the second part of the study, an order of magnitude analysis shows that the cycle-averaged thermal conductance can be maximized analytically by considering only the single-phase natural convection effect, and that the optimal time interval when heating is “on” agrees with the experimental results.

Single-Phase Natural Convection

2018 ◽  
pp. 87-99
Author(s):  
Maurizio Cumo ◽  
Antonio Naviglio
Keyword(s):  
Natural Convection ◽  
Single Phase

scholarly journals Numerical Study of Laminar Natural Convection in an Arch Enclosure Filled with Al2O3-Water Based Nanofluid

2016 ◽  
Vol 9 (6) ◽  
pp. 1927-1936 ◽  
Author(s):  
Manoj Kumar Triveni ◽  
Dipak Sen ◽  
Rajsekhar Panua ◽  
◽  
◽  
...  
Keyword(s):  
Natural Convection ◽  
Numerical Study ◽  
Water Based ◽  
Laminar Natural Convection
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