Computational Study of Effect of Increasing Heat Flux on Convective Heat Transfer in Sub Channels of Carbon Dioxide Flow at Pressure above Critical Value

Abstract:

This paper is focused on flow simulation in the sub channel of fuel rod assembly using code ANSYS Fluent 14, which is commercial computational fluid dynamics (CFD) code. Computational simulations are reported on convective heat transfer to carbon dioxide at a pressure of 7.59MPa. Pressure which is used in this simulation are just above the thermodynamic critical pressure value of CO₂. These have been carried out using a variable property, elliptic computational formulation incorporating low Reynolds number turbulence models of k–ε. Firstly, the simulations were compared with the effect of increasing heat flux on heat transfer coefficient. It has been found that the effect of buoyancy on turbulence production and heat transfer in fluids at supercritical pressure can be very significant even under conditions of relatively low buoyancy parameter based on bulk properties. It is clear that new heat transfer correlations are needed to account for such effects on heat transfer to supercritical pressure fluids as they come to be used more and more in new energy systems applications such as, advanced water-cooled nuclear reactors, high pressure water oxidation plant for waste processing.

• Periodical: Applied Mechanics and Materials (Volume 772)
• Pages: 8-13
• DOI: https://doi.org/10.4028/www.scientific.net/AMM.772.8
• Online since: July 2015
• Authors: Deepak Sharma, Krishna Murari Pandey*
• Keywords: ANSYS Fluent14& CFX, Computational Fluid Dynamics, Fuel Assembly, Heat Transfer, Sub Channel

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