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Panesar, JS; Heggs, PJ; Burns, AD; Ma, L; Graham, SJ (2015)
Publisher: Taylor & Francis
Languages: English
Types: Article

Classified by OpenAIRE into

arxiv: Physics::Fluid Dynamics
Numerical computations are presented for the temperature and velocity distributions of two differentially heated liquid columns with liquor depths of 0.1 m and 2.215 m, respectively. The temperatures in the liquid columns vary considerably with respect to position for pure conduction, free convection, and nucleate boiling cases using one-dimensional (1D) thermal resistance networks. In the thermal resistance networks the solutions are not sensitive to the type of condensing and boiling heat transfer coefficients used. However, these networks are limited and give no indication of velocity distributions occurring within the liquor. To alleviate this issue, two-dimensional (2D) axisymmetric and three-dimensional (3D) computational fluid dynamics (CFD) simulations of the test rigs have been performed. The axisymmetric conditions of the 2D simulations produce unphysical solutions; however, the full 3D simulations do not exhibit these behaviors. There is reasonable agreement for the predicted temperatures, heat fluxes, and heat transfer coefficients when comparing the boiling case of the 1D thermal resistance networks and the CFD simulations.
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    • Temperature Using Nu. Condensing Coefficient (°C) 60 70 80 90 100 110 120 Temperature Using Nu. Condensing Coefficient (°C) 60 70 80 90 100 110 120 130
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