Studying the laws of convective heat transfer

The article presents the results of the study of the nature of the change in the graph of the wall temperature dependence on the heat flux density. The results of these studies have shown that the double occurrence of intensification of the heat transfer process is characteristic of hydrocarbons and the latter does not depend on the direction of fluid movement and the position of the experimental tube.

As a result of the analysis of the graphs, it was established that, regardless of the values of the mass velocity, the course of the temperature curve changes several times and, in this case, the intensification of the heat exchange process occurs twice. The onset of the first improved heat transfer mode at lower values of the mass velocity corresponds to a lower value of the heat flux density. The onset of the second improved heat exchange in experiments with n-heptane during upward motion at different mass velocities corresponds to the same value of the heat flux density.

When analyzing experimental data obtained during the downward movement of n-heptane, it was established that heat transfer during the upward movement is accompanied by an additional sound effect – fluctuations in liquid pressure and wall temperature.

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