Interferometric research of heat transfer at air jet from ventilating outlets.

When designing the outlets for the ventilation or hot-air heating of particular spaces, we meet usually the problems to specify a form and reach of the air jet and a distribution of velocities and temperatures in the space followed. In practice the calculations of nonisothermal air jets are made using a number of calculation relations to be found e.g. in lit. (1) and other. But when applying the analogical relations derived by different authors we can find out considerable differences in results. This contribution is aimed at an experimental research of power and speed distribution in free lightly non-isothermal air jets from horizontally situated circular outlets. The experiments are carried out using Mach-z.ehnder interferometer and CCD camera connected to PC.