STUDI NUMERIK KONVEKSI PAKSA PADA TUBE BANKS DENGAN PENAMBAHAN VORTEX GENERATOR

Abstract

In the science of heat transfer there are many tools that have such a function, one of which is tube banks. Tube banks are a collection of cylinders or tubes that are used to transfer heat to the fluid passing through the tubes. Tube banks are divided into two types of arrangement, the first is aligned and the second is staggered. One of the drawbacks of tube banks is the uneven heat transfer process, which can result in the Nusselt number and efficiency of the heat exchanger being very low. Therefore we need a method called passive flow by adding an obstacle or fin called a vortex generator. Vortex Generator has a function to focus the flow on the fluid so that it can be evenly distributed through the tube. In each tube, vortex generators are usually placed in pairs with a predetermined diagonal position and a predetermined vertical and horizontal distance. And can be placed only on the first row or can be for the second row and so on. The author's focus this time is on tube banks of the staggered type with a total of 7 tubes. Then a rectangular vortex generator is added with many variants of the angle of inclination and the velocity of the fluid entering the inlet. All designs are made in modeler software and tested in fluid flow simulations. And the final result of this research, both through visual appearance on the contours and the results of calculations on the Nusselt number and average heat, show significant fluid flow and heat transfer phenomena after adding a vortex generator. However, as long as the variance of the vortex generator tilt angle is observed and not more than 40˚. Because if the angle of inclination is more than this value, the fluid will be blocked by the vortex generator itself and this phenomenon can also be called blockage.