MIXED CONVECTION IN A SINGLE-WALLED CARBON NANOTUBE-WATER NANOFLUID FILLED PARTIALLY HEATED TRIANGULAR LID-DRIVEN CAVITY HAVING AN ELASTIC BOTTOM WALL

Abstract

In this study, mixed convection of nanofluid filled triangular cavity with a partial heater and having an elastic bottom wall is analyzed with finite element method. Left vertical wall is partially heated while the inclined wall is kept at constant lower temperature. The bottom wall is flexible and inclined wall is moving at constant speed. Influences of Richardson number, elastic modulus of flexible wall, solid nanoparticle volume fraction on the convective heat transfer characteristics are analyzed. It was observed that, lower values of Richardson number, elastic modulus of the flexible wall and higher values of nano-particle volume fraction resulted in higher local and average heat transfer enhancements. Average heat transfer enhanced significantly when solid particle volume fraction of nanoparticle was increased. Enhancements up to 121% were obtained at solid volume fraction of 0.04 as compared to pure water at Richardson number of 1. Effects of elastic modulus of the bottom wall were found to be marginal and at Ri=1, enhancements up to 2% were achieved by using a more flexible wall.

Keywords

• Carbon Nanotube
• Nanofluid
• Flexible Wall
• Mixed Convection
• Simulation

References

1. [1] Khanafer K, Vafai K, Gaith, M. Fluid-structure interaction analysis of flow and heat transfer characteristics around a flexible microcantilever in a fluidic cell. International Communications in Heat and Mass Transfer. 2016; 75:315-22.
2. [2] Jamesahar E, Ghalambaz M, Chamkha AJ. Fluid-solid interaction in natural convection heat transfer in a square cavity with a perfectly thermal conductive flexible diagonal partition. International Journal of Heat and Mass Transfer. 2016; 100:303-19.
3. [3] Selimefendigil F, Oztop HF, Abu-Hamdeh N. Mixed convection due to rotating cylinder in an internally heated and flexible walled cavity filled with SiO2-water nanofluids: Effect of nanoparticle shape. International Communications in Heat and Mass Transfer. 2016; 71:168-78.
4. [4] Khanafer K. Comparison of flow and heat transfer characteristics in a lid-driven cavity between flexible and modified geometry of a heated bottom wall. International Journal of Heat and Mass Transfer. 2014; 78:1032-41.
5. [5] Oztop HF, Abu-Nada E. Numerical study of natural convection in partially heated rectangular enclosures filled with nanofluids. International Journal of Heat and Fluid Flow. 2008; 29: 1326-36.
6. [6] Lazarus G. Nanofluid heat transfer and applications, Journal of Thermal Engineering. 2015; 1(2):113-15.
7. [7] Ravi̇sankar R. Application of nanotechnology to improve the performance of tractor radiator using cu-water nanofluid. Journal of Thermal Engineering. 2018; 4(4):2188-2200.
8. [8] Imtiaz M, Hayat T, Alsaedi A, Ahmad B. Convective flow of carbon nanotubes between rotating stretchable disks with thermal radiation effects. International Journal of Heat and Mass Transfer. 2016; 101:948-57.

9. [9] Yazid MNAM, Sidika NAC, Yahya WJ. Heat and mass transfer characteristics of carbon nanotube nanofluids: A review. Renewable and Sustainable Energy Reviews. 2017; 80:914-41.
10. [10] Kamali R, Binesh A. Numerical investigation of heat transfer enhancement using carbon nanotube-based non-Newtonian nanofluids. International Communications in Heat and Mass Transfer. 2010; 37:1153-57.
11. [11] Estellé P , Halelfadl S , Maré T . Thermal conductivity of CNT water based nanofluids: Experimental trends and models overview. Journal of Thermal Engineering. 2015; 1(2):381-390.
12. [12] Brinkman H. The viscosity of concentrated suspensions and solutions. Journal of Chemical Physics. 1952; 20:571.
13. [13] Reddy JN, Gartling DK. The finite element method in heat transfer and fluid dynamics. Boca Raton, Florida: CRC Press;1994.
14. [14] Lewis RW, Nithiarasu P, Seetharamu KN. Fundamentals of the finite element method for heat and fluid flow. John Wiley & Son; 2004.
15. [15] Selimefendigil F, Öztop HF, Chamkha AJ. Analysis of mixed convection of nanofluid in a 3D lid-driven trapezoidal cavity with flexible side surfaces and inner cylinder. International Communications in Heat and Mass Transfer. 2017; 87:40-51.
16. [16] Selimefendigil F, Öztop HF. Natural convection in a flexible sided triangular cavity with internal heat generation under the effect of inclined magnetic field. Journal of Magnetism and Magnetic Materials. 2016; 417:327-37.