Thermal Striping Tests in Mixing Tees with Same Pipe Diameters (1st Report, Characteristics of Flow Patterns and Fluid Temperature Fluctuations)

In a branch pipe with one closed end, the cavity flow penetrates into the branch pipe from the main loop and a thermal boundary layer occurs because the cavity flow is a hot fluid, but heat removal causes a colder fluid in the branch pipe. This thermal stratification may affect the structural integrity. Therefore, a pipe design standard to suppress thermal fatigue should be established. The pipe design standard consists of the maximum penetration depth L sv and the minimum penetration depth L sh . In order to establish an evaluation method for L sh , a visualization test and a temperature fluctuation test were carried out. A theoretical formula for thermal stratification was introduced from the heat balance model. Then the model was used to obtain an empirical equation from the map of fluid temperature fluctuation. This method can predict the vortex penetration depth by cavity flow in horizontal branch pipes.

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Prediction of vortex penetration depth at thermal stratification by cavity flow in a branch pipe with closed end (effect of heat radiation condition on temperature fluctuations)

Shiina

Kawamura

Ohtsuka

et al. 2006

Heat Trans. Asian Res.

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Fluid structure interaction simulation of thermal striping in a t-junction pipe made of functionally graded material

Inaba

Karmakar

et al. 2021

Int J Mech Mater Des

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Experimental Study on Turbulent Flow and Mixing in Counter-Flow Type T-Junction

Hirota

Nakayama

Koide

et al. 2008

JTST

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An experimental study was conducted on turbulent flow and mixing in a counter-flow type T-junction. We measured the velocity and concentration fields simultaneously by combining PIV and PLIF. Special attention was directed to the concentration fluctuation near the channel wall, which might bring about the high-cycle thermal fatigue in case of mixing of hot and cold flows. The velocity ratio of the counter-channel flow to the main-channel flow was changed from 1.0 to 5.0. The fluorescent dye was mixed in the main-channel flow. The dominant structures of the fluctuating velocity and concentration fields that cause the concentration fluctuation near the channel wall were analyzed by POD. It was found that the concentration fluctuation near the channel wall was caused by the superposition of the spanwise wobbling motion of the mixing interface of two flows and the rotational oscillation of the flows.

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Thermal Striping Tests in Mixing Tees with Same Pipe Diameters (1st Report, Characteristics of Flow Patterns and Fluid Temperature Fluctuations)

Cited by 3 publications

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Prediction of vortex penetration depth at thermal stratification by cavity flow in a branch pipe with closed end (effect of heat radiation condition on temperature fluctuations)

Prediction of vortex penetration depth at thermal stratification by cavity flow in a branch pipe with closed end (effect of heat radiation condition on temperature fluctuations)

Fluid structure interaction simulation of thermal striping in a t-junction pipe made of functionally graded material

Experimental Study on Turbulent Flow and Mixing in Counter-Flow Type T-Junction

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