Experiment Study

Experiment Study

ABSTRACT

Tests have been performed to distinguish the interactions of thermo fluid between the transferred heat and the oscillatory fluid motion gathered from a hot cylinder which is immersed in a acoustic standing wave. A stagnant round shape cylinder was put inside a water channel along with the immersion in a sinusoidal oscillatory flow. The particle image velocimety as well as the planar induced laser was used to continuously confine the synchoronus veloctity that is tyime dependant as well as the fields of temperature throughout the cylinder. The vorticity generation along with the heat convention from a cylinder was observer to greatly differ from the steady flows. The local phase and time dependent rates of heat transfer were gathered as a function of the acoustic Reynolds number, non dimensional frequency parameters and the Keulegan Carpenter number. The observations would show the role of the secondary vertical interaction on the transfer of heat.

Introduction

The transfer of heat and the fluid flow across the bluff bodies immersed in the channel are observed to have a great significance as well as the relevance in practical engineering. The engineering applications invole the regeneration of heat for the stirling engines, cooling as well as the overall all design of the heat exchangers. The paper would show the issue in which ambient flow is a oscillatory channel flow. The past studies have targeted over the physics of oscillatory flow as well as the understanding of the phenomenum of fluid mechanic. Williamson in his research focused over the vertical flows as well as the forces of the fluids over the cylinders in oscillorty motion. Spontanueous visualization of flow as well as the measurements of force were doing through the neutrally buoyant polystyrene bead. Other reasearchers of the area of velocity in circular cylinders in the flow was done by Obassju and Justesen showing the particle techniques to calculate the acoustic particle by the utilization of a singular hot wire anemometer. This method would allow the knowledge of the speed amplitude as well as the phase. The benefit of using this is that it would not require any seeding. But that would allow the research of the field in small areas. The hot wire probe should be traversed that is difficult in most cases. PIV is considered as a optical techniques to calculate the speed as well as the direction of the flow that is based over the motion of seeded particles. The benefit of PIV is that it would give 2 or 3 dimensional vector field as other methods provide only unit dimensional locations. Hann showed a methods that allows the calculation of the velocity as particle velocity instantaneously on a area through the use of PIV methods. Blanc utilized this to research the flow field in the internal base of the thermoacoutic system. They observed the vortex creation along the sides of the thick and thin plates in a 2/3 wavelength system. It was also found that the flow field near the side of the plates ...