Host: The Japan Society of Mechanical Engineers
Name : [in Japanese]
Date : September 03, 2017 - September 06, 2017
Thermal fatigue cracking may initiate at a tee pipe where high and low temperature fluids flow in. The mixing flow causes temperature fluctuation near the pipe wall and may result in fatigue crack initiation. In this study, flow pattern at the mixing tee pipe was investigated by experiments in order to prevent the thermal fatigue. Visualization of flow was conducted by a test section of transparent acrylic resin and a tracer method. This test section is consisted of a horizontal main pipe with an inner diameter of 150 mm and a vertical branch pipe with an inner diameter of 50 mm. Flow in the main pipe penetrated into the branch pipe. The penetration patterns were categorized by the momentum ration for the flows in the main and branch pipes. The maximum penetration depth was measured from the movement of tracer particles. Relationship between the maximum penetration depth and the momentum ration was investigated.
