Analysis of temperature oscillations parameters of heat exchanging systems

摘要

The oscillations of temperature in the transient states of heat exchanging systems were investigated. The experiments were carried out using a heat exchanger model. The resistance heating cooper rod was an active side and an element (identical in shape) situated above them, but without contact, was the passive side of the model heat exchanger. During the experiments, the oscillatory character of the changing temperature of the passive element versus the active element was observed. The following parameters of these oscillations were investigated: frequency of free oscillations, damping coefficient and relative damping coefficient. The values of heat flux, distances between elements and their shapes (in pair) were changed and their influence on the parameters of the oscillations were investigated. The value of heat flux has the greatest impact on the values of all the examined oscillation parameters; there is an increase in the value of all the parameters along with the increase in the value of the heat flux. There was no influence of the shape of the element on the values of the investigated parameters. The values of the frequency of free oscillations and the damping coefficient decrease at an increasing distance between them, but the relative damping coefficient increases. These dependencies indicate the complex nature of the studied oscillations.