Powei Huang Publications Content

Publications

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Underlined names are links to recent or past GEG members

REFEREED PUBLICATIONS IN JOURNALS

1. 
Huang, P.W., and F. Wellmann, An Explanation to the Nusselt–Rayleigh Discrepancy in Naturally Convected Porous Media, Transport in Porous Media, 2021. [Download PDF] [View Abstract]We model hydrothermal convection using a partial differential equation formed by Darcy velocity and temperature—the velocity formulation. Using the Elder problem as a benchmark, we found that the velocity formulation is a valid model of hydrothermal convection. By performing simulations with Rayleigh numbers in the non-oscillatory regime, we show that multiple quasi-steady-state solutions can be one of the reasons that caused the Nusselt–Rayleigh discrepancy found in previous experiments. The results reveal more understandings about the nature of uncertainty of convection modes in porous media.


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PROCEEDINGS REFEREED

1. 
Huang, P.W., and J.F. Wellmann, Investigating Different Formulations for Hydrothermal Convection in Geothermal Systems, Proceedings World Geothermal Congress 2020, 2020. [View Abstract]Hydrothermal convection in porous media is an essential piece of physics in geothermal reservoirs, and understanding them leads to better development of geothermal energy. We analyze the validity of simulating hydrothermal convection using different formulations of partial differential equations. Using the Elder problem as a benchmark, we found out that the stream function formulation and the velocity formulation are a valid and efficient model of hydrothermal convection. The Nusselt number and entropy production are measurements of the quality of convective heat transfer. The Rayleigh number describes the physical properties of a porous media. We use simulations to investigate further the discrepancy in the Nusselt Rayleigh relationship found in previous experiments. The conclusion is that the multiple steady states of convection pattern in a 3D box are the main reason for the discrepancy found in the Nusselt-Rayleigh relationship.


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THESES

1. 
Huang, P.W., Investigating different formulations for hydrothermal convection in geothermal systems, MSc Thesis, RWTH Aachen, 2017. [View Abstract]Hydrothermal convection in porous media is an important piece of physics in geothermal reservoirs, and understanding them leads to better development of geothermal energy. We analyze the validity of simulating hydrothermal convection using different formulations of partial differential equations. Using the Elder problem as a physical benchmark, we found out that the stream function formulation and the velocity formulation are a valid and efficient model of hydrothermal convection. The Nusselt number and entropy production are measurements of the quality of convective heat transfer. The Rayleigh number describes the physical properties of a porous media. We use simulations to further investigate the discrepancy in the Nusselt Rayleigh relationship found in previous experiments. The conclusion is that the multiple steady states of convection pattern in a 3D box are the main reason for the discrepancy in the Nusselt Rayleigh relationship.