THE EFFECT OF TRANSVERSE VIBRATION ON THE NATURAL CONVECTION HEAT TRANSFER IN A RECTANGULAR ENCLOSURE

The effect of transverse vibration on the natural convection heat transfer in a rectangular enclosure with an aspect ratio of 0.5 filled with air as a working fluid aligned horizontally on a mechanical shaker generating a sinusoidal transverse vibrational displacement was studied experimentally. The study was carried for a Raghiely number between (3.77 - 10.8)*107 with applied heat flux between (20 - 45) Watt. The vibrational experimental measurements were carried out for different frequency ratio (0.87-1.6) and vibrational Rayleigh number ranged between (0.12 - 2.7)*107 . The results of the heat transfer inside the enclosure without vibration show a very close agreement with the published one. The vibrational heat transfer results show that the behavior of different heat transfer convection parameters can be affected by applying a forced vibration condition. It is shown that the high heat transfer can be achieved at frequencies near to the system natural frequency at constant heat flux. Also, it is concluded that a careful attention should be given to the proper selection of heat flux and frequency ratio results in obtaining maximum values of heat transfer parameters with low cost of power consumption