Mixing Enhancement By Using Airtabs in Convergent Nozzle

Mixing enhancement has wide applications in aerodynamics, welding, automobiles, food industry, pharmaceutical industry etc. Therefore, various techniques have been invented to improve it. Co-flow jets are used for promoting mixing characteristics. In this case outer jet interact with inner jet and reduces the length of potential core which results in mixing enhancement. Even change in size and shape of nozzle act as parameters which varies the mixing characteristics. Airtabs are used as main variable in this study to increase the mixing enhancement. Two airtabs and four airtabs were used at the exit of the convergent nozzle. Primary jet forms from nozzle whereas secondary jet forms from air tabs. In this condition experiments were carried out at two airtabs open and four airtabs open. These results were compared to the case of without airtabs. The readings obtained from the manometers were tabulated in excel and obtained results were plotted by using the Techplot software. The graphs were plotted between X/D and M/Me. Both are dimensionless numbers. After observing all the plots it is concluded that mixing enhancement increases with increase in mach number of secondary jet. If the difference between primary jet mach number and secondary jet mach number is more then the length of the potential core is very small