lattice heat
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Author(s):  
Zhihui Sun ◽  
Jie Zhang ◽  
Hanxiao Wang ◽  
Guangshan Pan ◽  
Tianhua Wang ◽  
...  


Author(s):  
Tong Wu ◽  
Joel C. Najmon ◽  
Andres Tovar

Abstract Lattice Heat Transfer (LHT) structures provide superior structural support while improving the heat transfer coefficient through their high surface-to-volume ratios. By using current Additive Manufacturing (AM) technologies, LHT with highly complex structures is possible. In this study, the design concept of LHT is further improved by implementing a thermomechanical topology optimization method. With utilization of design-dependent heat source, the method can be applied to generate stiffer LHT structures under mechanical and thermomechanical loads, without decreasing their thermal performance; relative to a design made of a uniform LHT having the same mass fraction. Two numerical examples are presented to illustrate how to use the proposed approach to design LHT sections. The results show that the mechanical performance can be improved more than 50% compared to a uniform LHT with the same mass fraction, without decreasing the thermal performance. The method does not require a fluid mechanics model, thus it is computational effective and particularly suitable for the conceptual design stage. The resulting optimized lattice is made possible by utilizing additive manufacturing technologies.



2019 ◽  
Vol 3 (8) ◽  
Author(s):  
Y. Ishii ◽  
Y. Ouchi ◽  
S. Kawaguchi ◽  
H. Ishibashi ◽  
Y. Kubota ◽  
...  


2018 ◽  
Vol 113 (19) ◽  
pp. 193902 ◽  
Author(s):  
Yi Xia ◽  
Maria K. Y. Chan
Keyword(s):  




2016 ◽  
Vol 858 ◽  
pp. 949-953 ◽  
Author(s):  
Miguel Hinojosa ◽  
Aderinto Ogunniyi ◽  
Stephen Bayne ◽  
Edward van Brunt ◽  
Sei Hyung Ryu

This paper presents the current progress in the development of an electro-thermal numerical model for 22 kV 4H-silicon carbide IGBTs. This effort involved the creation of a TCAD model based on doping profiles and structural layers to simulate the steady-state and switching characteristics of recently-fabricated experimental devices. The technical challenge of creating this high voltage SiC IGBT model was incorporating semiconductor equations with sub-models representing carrier mobility, generation, recombination, and lattice heat flow effects with parameters conditioned for 4H-silicon carbide material. Simulations of the steady-state and switching characteristics were performed and later verified with laboratory measurements for an N-type SiC IGBT rated for 22 kV with an active area of 0.37 cm2 and a drift region of 180 μm.



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