Elucidation of Thermal Hydraulic Mixing Mechanism in a Mixing Tee Area with a 90-degree Bend Upstream and Development of Thermal-striping Relaxation and Control Methods

Sugawara, Yoshimasa*; Yuki, Kazuhisa*; Hashizume, Hidetoshi*; Tanaka, Masaaki  ; Muramatsu, Toshiharu

In this study, non-isothermal fluid mixing experiments in a T-junction area with a 90-degree bend upstream were carried out to estimate the fluid-temperature fluctuation in the vicinity of wall. The temperature fluctuations for various flow mixing conditions were measured, changing a velocity ratio and a pipe diameter ratio of a main pipe to a branch pipe to quantitatively evaluate the effect of a secondary flow on the temperature fluctuation. In addition, by analyzing both the visualization data taken by a PIV system and the temperature fluctuation data, it was attempted to construct a prediction formula for the temperature fluctuation.