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.
Highlights
Mixed convective heat transfer due to a moving surface plays an important role in different thermal engineering applications such as in nuclear reactors, food processing, chemical processes, cooling of electronic devices and many others
In this study we considered the mixed convection of carbon nanotube-water nanofluid filled triangular cavity having a flexible wall
As compared to other studies related to convection in flexible walled cavities, the location of the flexible part become important for the heat transfer enhancement
Summary
Mixed convective heat transfer due to a moving surface plays an important role in different thermal engineering applications such as in nuclear reactors, food processing, chemical processes, cooling of electronic devices and many others. The mixed convection in cavities can be affected by using flexible walls [1,2,3,4]. A numerical study for the mixed convective heat transfer in a nanofluid filled square cavity having flexible side walls and with internal heat generation was performed in Ref. Mixed convection a lid driven cavity with a flexible bottom wall was investigated in ref. Mixed convection a lid driven cavity with a flexible bottom wall was investigated in ref. [4] and it was observed that profound enhancement in the heat transfer with flexible wall achieved when compared with flat wall configuration
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