2012 Fiscal Year Final Research Report

Elucidation of Multiple-scale Mass Transfer Mechanism from Wall toComplex Turbulent Flow and Challenge to FAC Control Technique

Research Project

Project/Area Number	23760821
Research Category	Grant-in-Aid for Young Scientists (B)
Allocation Type	Multi-year Fund
Research Field	Nuclear engineering
Research Institution	Tohoku University
Principal Investigator	EBARA Shinji 東北大学, 大学院・工学研究科, 准教授 (30325485)
Project Period (FY)	2011 – 2012
Keywords	流れ加速型腐食 / 旋回流 / オリフィス / 速度変動
Research Abstract	In order to clarify the relationship between flow-accelerated corrosion and scales of fluid motion, i.e., frequencies in the turbulent motion, visualization experiments for fluid flow by using PIV method were conducted and the flow fields were analyzed in detail. When the levels of power spectrum densities of fluctuating velocities obtained from the experiments were compared to the profile of pipe wall thinning obtained from an actual plant, their trend showed a fair agreement with each other. Furthremore, they showed a better agreement when a low-pass filtering operation was done for the fluctuating velocities. However, Reynolds stress profile showed a much more better agreement with the actual profile of pipe wall thinning.

(4 results)