International Scientific Journals
of Scientific Technical Union of Mechanical Engineering "Industry 4.0"

When developing new types of heat exchanger constructions, such factors as their mass-size characteristics, efficiency of heat transfer through the separating heat-carrier surface, pressure losses in the paths for each of the heat-carriers and other parameters characterizing the heat-exchange apparatus play an important role. CFD modeling of heat and mass transfer processes in a tube bundle at different Re numbers with compact placement of tubes, using ANSYS Fluent software package, has been conducted. The mathematical model is based on Navier-Stokes equation, energy conservation equation for convective flows and continuity equation. The standard k-ε model of turbulence is used in the calculations. The fields of velocities, temperatures, pressures in the studied channels have been obtained. The hydrodynamic flow conditions in the channels are analyzed and the intensity of heat transfer between the hot and cold coolant through the wall separating them is estimated. Based on the results of CFD modeling, the criterial equation of Nu, number is derived, which can be used in engineering calculations of heat exchange apparatuses with compact tube bundles.

By using the application package ANSYS Fluent, the numerical simulation of heat and mass transfer processes in the channels of shell-and-tube heat exchanger with compact placement of tube bundles has been carried out. The fields of velocities, temperatures and pressures in the heat exchanger channel were obtained and the conditions of hydrodynamic flow in the channels and the processes of heat transfer in these channels were analyzed. A new construction of shell-and-tube heat exchanger with compact arrangement of tubes in tube bundles is proposed and developed.