Marangoni convection and heat transfer of wavy trapezoidal and C-shaped enclosures filled with nanofluid / Sharifah Nuriza Syed Muhammad Naquib Al‘Aidrus

Sharifah Nuriza , Syed Muhammad Naquib Al‘Aidrus (2023) Marangoni convection and heat transfer of wavy trapezoidal and C-shaped enclosures filled with nanofluid / Sharifah Nuriza Syed Muhammad Naquib Al‘Aidrus. PhD thesis, Universiti Malaya.

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Abstract

The Marangoni effect is a type of natural convection that takes into consideration the surface tension gradient of the interface between two fluids where heat and mass move along it. The effect has many different applications including in microgravity, crystal growth, welding and cooling of electronic components. The present study considers this problem in a wavy trapezoidal and C-shaped enclosures filled with nanofluid. One side of the cavity is heated with the temperature profile varied while the opposite side is cooled at constant temperature. The governing equations which are the continuity, momentum and energy equations, are then derived and non-dimensionalied in order to simplify the system. The equations are then solved using COMSOL 5.3a which utilizes the Galerkin approach of the finite element method and the domain is discretised into fine triangular elements. The approximate solutions obtained are then graphically presented as streamlines, isotherms, local Nusselt and average Nusselt numbers. The general observation made from the outputs is that fluid flow and heat transfer increase with the Marangoni and Rayleigh number. In addition, the wavy wall also helps with temperature distribution when the wavelength is incremented. Furthermore, constant heating performs significantly better than the sinusoidal temperature profile. Applications of this study can be in heat exchangers and building insulation.

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