Development of an annular mist flow generating device for air-water flow

Abstract

Annular mist flow generating device is being developed to generate annular mist flow of air and water to simulate two phase flow pattern in the evaporator. The annular mist flow generating device is use for experimental study of the air water flow behaviour that simulates the two phase flow of refrigerant. Annular mist flow at inlet of the dividing header will provide batter air water distribution to the branches. The annular mist flow generating device shall be designed using computer aided drawing (CAD) software. Then, fabricate the annular mist flow generating device. After that, the annular mist flow generating device will be test experimentally by visual observation of the air water flow pattern. The air superficial velocity and water superficial velocity use in this experiment is 1.0m/s - 5.0m/s and 0.015m/s - 0.045m/s respectively. The test channel had a horizontal header with a square cross section of 20mm × 20mm and length of 290 mm with 10 upward branches. In this experiment the air water flow patterns is observed and recorded using digital camera. It was found that the device generate annular mist flow at frontal of the dividing header. This experiment proved that the device is capable of generating annular mist flow within the design range of air and water superficial velocities.