Selective laser melting of G-surface lattice: forming process and boiling heat transfer characteristics
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RESEARCH PAPER
Selective laser melting of G-surface lattice: forming process and boiling heat transfer characteristics Jianrui Zhang & Pei Li & Bo Qian & Bo Li & Zhijun Qiu & Fuzhen Xuan
Received: 13 April 2020 / Accepted: 9 June 2020 # Springer Nature B.V. 2020
Abstract In this paper, the selective laser melting (SLM) forming method was combined with the requirement of boiling heat transfer for porous structure to study the forming process and boiling heat transfer characteristics of porous structure of Gsurface lattice formed by SLM. 316L stainless steel powder was used to rasterize the G-surface structure. Besides, porosity and surface morphology of Gsurface lattice were analyzed. Deionized water was used for boiling heat transfer experiment to study the effect of technological parameters on boiling heat transfer enhancement. On this basis, the bubble escape modes in different stages of boiling heat transfer of G-surface lattice were considered, and the delay of the critical heat flux caused by Gsurface lattice was explained. This study provides a useful reference for the design of lattice heat cooling structure.
This article is part of the topical collection: Role of Nanotechnology and Internet of Things in Healthcare Guest Editors: Florian Heberle, Steve bull and John Fitzgerald J. Zhang : P. Li : B. Qian (*) : B. Li : F. Xuan (*) School of Mechanical and Power Engineering, East China University Of Science and Technology, Shanghai 200237, China e-mail: [email protected] e-mail: [email protected] J. Zhang : Z. Qiu School of Mechanical, Materials, Mechatronic and Biomedical Engineering, University of Wollongong, Wollongong, Australia
Keywords Selective laser melting . G-surface . Boiling heat transfer . Grid forming . Nanostructure . Microstructure
Introduction G-surface, namely, minimal surface, can be defined by two mathematical descriptions of the area description and the curvature description (Andersson et al. 1988). For the area description, G-surface is defined as the surface with the smallest area satisfying all external constraints (such as surface circumference or external stress conditions). For the curvature description, Gsurface is defined as the surface with the average curvature of zero (Lord and Mackay 2003). The definition of average curvature is as follows: the average curvature is the average of the main curvature which is the maximum and minimum curvature of a point in space on any surface. Triply periodic minimal surface is the periodic minimal surface function, which show periodic changes along the X, Y, Z axes in Euclidean space. With the help of periodicity of triply periodic minimal surface, smooth and fully connected porous structures can be formed (Zhang et al. 2019; Feng 2017). In this chapter, the most commonly used G-surface is used. Different from lattice structure and grid structure, G-surface is composed of continuous and smooth shells with large surface area. In addition, G-surface also has a continuous internal channel, which divides the space into two intertwined subd
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