Numerical simulation of heat transfer in double-pipe heat exchangers with diffuser channels with small opening angles with gas and liquid coolants has been performed. During the calculations, a three-parameter differential RANS turbulence model was used, supplemented by a transfer equation for a turbulent heat flow. It is shown that due to the intensification of heat transfer in heat exchangers with diffuser channels, the amount of heat transferred from the «hot» coolant to the «cold» ones increases compared to heat exchangers with channels of constant cross section.
Теплообменник «труба в трубе» с диффузорными каналами с газовыми и жидкими теплоносителями
Выполнено численное моделирование теплообмена в теплообменниках «труба в трубе» с диффузорными каналами с малыми углами раскрытия с газовыми и жидкими теплоносителями. При проведении расчетов использована трехпараметрическая дифференциальная RANS-модель турбулентности, дополненная уравнением переноса для турбулентного потока тепла. Показано, что за счет интенсификации теплообмена в теплообменниках с диффузорными каналами количество переданного тепла от «горячего» теплоносителя к «холодному» возрастает по сравнению с теплообменниками с каналами постоянного сечения.
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