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ISSN Online: 2377-424X

ISBN Print: 978-1-56700-421-2

International Heat Transfer Conference 15
August, 10-15, 2014, Kyoto, Japan

Numerical Simulation of 3D Flow Effect on Heat Transfer from a Tube Bank of Subsea Cooler

Get access (open in a dialog) DOI: 10.1615/IHTC15.hex.009766
pages 3663-3674

要約

The current contribution deals with a buoyancy-induced flow through a sparse inline tube bank of 12 rows. The goal of the study is to examine numerically the effect of water ejection through the side borders on the main vertical draft flow. Three-dimensional unsteady convection through the tube bank is computed assuming the infinite number of tubes in the transverse direction. The tube walls are assumed to be of a uniform temperature. The buoyancy effects are described with the Boussinesq approximation. The computations have been performed for the Prandtl number of 7.0, the Grashof number of 5×10^4, and the Reynolds numbers of the order of 10^2. A finite-volume Navier-Stokes code of second order accuracy both in space and time was used for simulation. Computational grids consisting of 5-10 million cells were employed. Unsteady flow inside the tube bank compartment as well as spatial variation of the instantaneous and time-averaged heat transfer coefficient values have been analyzed. The influence of the length of the tube straight sections on the water ejection has been investigated. It was found that the influence of ejection through the side boundaries of a tube bank on the integral heat transfer coefficient level is significant. A promising way to reduce the side flow effects is to install the vertical bounding walls disabling the side flow. Side walls produce a chimney effect resulting in a draft flow acceleration and correspondent increase in the heat output from a passive buoyancy-dominated subsea cooler.