Heat-mass transfer analysis in multiple jets

In cases where the heat transfer coefficient is difficult to detect, it may be necessary to use high technologies for measurement, especially to avoid wall-conduction errors. This increases the measurement costs very high. However, in recent years, different methods have been applied for heat transfer coefficient determination. In this thesis, the use of naphthalene sublimation technique which is one of the methods developed in recent years and which is based on mass transfer technique has been used in multiplier jets which are used in many industrial fields and have high heat and mass transfer capability. Naphthalene is a white compound with a bright crystal structure with a special smell. It is organic and belongs to the class of aromatic compounds of organic chemistry. There is no liquid form of naphthalene with sublimation, and the technique of naphthalene sublimation allows us to obtain accurate measurements. However, in order for the method to give accurate results, the density of the solid naphthalene, the saturated vapor density / pressure and the mass diffusion coefficient in the air/ Schmdit number must be determined accurately. The experimental set-up for this thesis consists of naphthalene tablets placed on a tripod and a heated air jet which is impinging to naphthalene at the Fırat University Engineering Faculty Mechanical Engineering Department Fluid Mechanics Laboratory. As a result of the studies carried out, the mass differences of the samples weighed before and after the test for the mass loss measurement and the sublimation quantities calculated by taking into consideration the time passed, the increase in the jet outlet temperature increased the mass transfer and heat transfer increased at the same rate. The increase of Reynolds number has a positive effect on both mass transfer and heat transfer.