Unsteady conjugate natural convection in a semicircular cavity with a solid shell of finite thickness filled with a hybrid water-based suspension of Al_{2}O_{3} and Cu nanoparticles (hybrid nanofluid) has been analyzed numerically. The governing equations for this investigation are formulated in terms of the dimensionless stream function, vorticity, and temperature and have been solved by the finite difference method of the second-order accuracy. The effects of the dimensionless time, Rayleigh number, thermal conductivity ratio, and the nanoparticles volume fraction on the flow patterns and heat transfer have been studied. The obtained results have revealed essential heat transfer enhancement at solid–fluid interface with addition of nanoparticles. In addition, a comparison of the heat transfer enhancement level due to the suspension of various nanoparticles materials (Al_{2}O_{3} and Cu) in water as regular nanofluids (Al_{2}O_{3}/water and Cu/water) and as a hybrid Al_{2}O_{3}–Cu/water nanofluid is reported.

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# Numerical Analysis of Unsteady Conjugate Natural Convection of Hybrid Water-Based Nanofluid in a Semicircular Cavity

Ali J. Chamkha

,
Ali J. Chamkha

Mechanical Engineering Department,

Prince Mohammad Bin Fahd University,

Al-Khobar 31952, Saudi Arabia;

Prince Mohammad Bin Fahd University,

Al-Khobar 31952, Saudi Arabia;

Prince Sultan Endowment for Energy

and Environment,

Prince Mohammad Bin Fahd University,

Al-Khobar 31952, Saudi Arabia

and Environment,

Prince Mohammad Bin Fahd University,

Al-Khobar 31952, Saudi Arabia

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Igor V. Miroshnichenko

,
Igor V. Miroshnichenko

Laboratory on Convective

Heat and Mass Transfer,

Tomsk State University,

Tomsk 634050, Russia

Heat and Mass Transfer,

Tomsk State University,

Tomsk 634050, Russia

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Mikhail A. Sheremet

Mikhail A. Sheremet

Laboratory on Convective

Heat and Mass Transfer,

Tomsk State University,

Tomsk 634050, Russia;

Heat and Mass Transfer,

Tomsk State University,

Tomsk 634050, Russia;

Department of Nuclear and

Thermal Power Plants,

Tomsk Polytechnic University,

Tomsk 634050, Russia

Thermal Power Plants,

Tomsk Polytechnic University,

Tomsk 634050, Russia

Search for other works by this author on:

Ali J. Chamkha

Mechanical Engineering Department,

Prince Mohammad Bin Fahd University,

Al-Khobar 31952, Saudi Arabia;

Prince Mohammad Bin Fahd University,

Al-Khobar 31952, Saudi Arabia;

Prince Sultan Endowment for Energy

and Environment,

Prince Mohammad Bin Fahd University,

Al-Khobar 31952, Saudi Arabia

and Environment,

Prince Mohammad Bin Fahd University,

Al-Khobar 31952, Saudi Arabia

Igor V. Miroshnichenko

Laboratory on Convective

Heat and Mass Transfer,

Tomsk State University,

Tomsk 634050, Russia

Heat and Mass Transfer,

Tomsk State University,

Tomsk 634050, Russia

Mikhail A. Sheremet

Laboratory on Convective

Heat and Mass Transfer,

Tomsk State University,

Tomsk 634050, Russia;

Heat and Mass Transfer,

Tomsk State University,

Tomsk 634050, Russia;

Department of Nuclear and

Thermal Power Plants,

Tomsk Polytechnic University,

Tomsk 634050, Russia

Thermal Power Plants,

Tomsk Polytechnic University,

Tomsk 634050, Russia

*J. Thermal Sci. Eng. Appl*. Dec 2017, 9(4): 041004 (9 pages)

**Published Online:**April 19, 2017

Article history

Received:

May 15, 2016

Revised:

February 22, 2017

Citation

Chamkha, A. J., Miroshnichenko, I. V., and Sheremet, M. A. (April 19, 2017). "Numerical Analysis of Unsteady Conjugate Natural Convection of Hybrid Water-Based Nanofluid in a Semicircular Cavity." ASME. *J. Thermal Sci. Eng. Appl*. December 2017; 9(4): 041004. https://doi.org/10.1115/1.4036203

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