Experiments on the similarity of the internal flow in wall attachment devices.

Abstract

The similarity of the internal flow in wall attachment devices has been examined experimentally for the Reynolds number range of 8×103∼24×103, based on the dimensions of the device model, the nozzle velocity and the kinematic viscosity of fluid. The nozzle width, which represents the characteristic scale of the device model, was altered in the range of 1.5 mm to 12 mm in the case of a water device model, and 1.5 mm to 6 mm in the case of an air model. Throughout the present study, the geometric shape of all the device models was made similar by altering both the splitter distance and the side wall angle. The results show that the internal flow in the water device models was similar for each model within the range of the experimental Reynolds number. The water models and the air models have different linear relationships between the reattachment distance and the maximum side wall pressure distance, respectively.