The influence of molten pool geometry on forced convective heat transfer

Cheng-hua Wei; Bo-lang Fang; Wei-ping Liu; Li-jun Wang; Zhi-liang Ma

doi:10.1117/12.2181909

4 May 2015 The influence of molten pool geometry on forced convective heat transfer

Cheng-hua Wei, Bo-lang Fang, Wei-ping Liu, Li-jun Wang, Zhi-liang Ma

Proceedings Volume 9543, Third International Symposium on Laser Interaction with Matter; 954304 (2015) https://doi.org/10.1117/12.2181909
Event: Third International Symposium on Laser Interaction with Matter, 2014, Jiangsu, China

Abstract

An investigation was conducted to determine the relationship between heat transfer coefficient and molten pool’s geometry. It was accomplished by performing an experimental and numerical investigation using a cylinder dimple with two different serials of geometry: (1) cylinder dimples with fixed print diameter D=50mm and different depth, and (2) cylinder dimples with fixed depth d=10mm and different print diameter. The airflow speed varies from 50m/s to 250m/s in the turbulent regime. The results consist of flow characteristics, mainly velocity profile and heat transfer characteristics, including heat transfer coefficient and Nusselt number along flow direction, were obtained. The comparison was held against the smooth surface. Results showed that a centrally-located vortex was formed due to the flow separation. For heat transfer coefficient, such augmentations are present near the downstream edges and diminutions are present near the upstream edges of dimple rims, both slightly within each depression. It was found that the convection heat transfer coefficients with different geometry parameters have similar distribution along flow direction. A uniform piecewise linear function was built to describe the heat transfer characterizes for different molten pool print diameter.

Citation Download Citation

Cheng-hua Wei, Bo-lang Fang, Wei-ping Liu, Li-jun Wang, and Zhi-liang Ma "The influence of molten pool geometry on forced convective heat transfer", Proc. SPIE 9543, Third International Symposium on Laser Interaction with Matter, 954304 (4 May 2015); https://doi.org/10.1117/12.2181909

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