CFD modeling of compact bundle of tubes and outputting the criterion equation of Nu number
DOI:
https://doi.org/10.31548/machenergy2019.01.151Keywords:
Heat Exchanger, CFD Modeling, Heat-Mass Transfer, Tube Bundle, Number Nu.Abstract
In the development of new types of designs of heat-exchange units, factors such as their mass-overall characteristics, the efficiency of heat transfer through the surface separating the heat carrier, the loss of pressure in the tract for each of the heat-carrier and other parameters characterizing the heat-exchange apparatus play an important role.
The CFD modeling of heat and mass transfer processes in a bundle of pipes at various Re numbers with a compact pipe arrangement was carried out using the ANSYS Fluent software complex. The basis of the mathematical model is the Navier-Stokes equation, the energy conservation equation for convective currents and the continuity equation. In the calculations, a standard k-ε turbulence model was used. The fields of velocities, temperatures, and pressure in the studied channels are obtained. The conditions of the hydrodynamic flow in the channels are analyzed and the heat transfer intensity measurements between the hot and cold coolant through the wall that separates them are carried out. On the basis of the results of CFD simulation a criterion equation Nu is derived which can be used for engineering calculations of heat exchangers with compact bundles of pipes.
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