Thesis
ADDITIVE MANUFACTURING WITH FUGITIVE MATERIALS FOR MICROFEATURED CERAMICS AND DESIGN OPTIMIZATION FOR HEAT EXCHANGE APPLICATIONS
Washington State University
Master of Science (MS), Washington State University
01/2021
DOI:
https://doi.org/10.7273/000001868
Handle:
https://hdl.handle.net/2376/121460
Abstract
Microfeatured ceramics can dramatically increase the surface area per unit volume in high temperature applications such as heat exchangers and fuel cells. This thesis describes a multi-pass crossflow heat exchanger with intricate microchannels that can be formed by a novel additive manufacturing technique. Due to the high surface area allowed by microfeatured ceramics, a high heat transfer to weight ratio is possible in these types of heat exchangers while still maintaining high effectiveness. The optimal geometry for maximizing gravimetric heat transfer while still achieving an effectiveness greater than 78.3% and a temperature difference greater than 630℃ was found by fitting a least square empirical model to CFD simulation results for type of heat exchanger. This design was found to have a heat transfer to weight ratio of 24.1 W/g, assuming it is made from fully dense 8 mole percent yttria stabilized zirconia ceramic. Yttria stabilized zirconia was found to be better suited for microchannel heat exchangers of this type compared to metals due to a lower thermal conductivity which reduces the amount of axial conduction through the heat exchanger structure. Fugitive materials were experimentally tested for manufacturing prototypes of the microchannel heat exchanger via a dry powder pressing and sintering process. It was determined that graphitic fugitive materials would allow for manufacture of microchannels. Multiple channels on separate vertical layers were made in yttria stabilized zirconia ceramics with graphite as the fugitive material. In addition, a flow channel was made in a vanadia doped yttria stabilized zirconia ceramic, a novel solid oxide fuel cell material, showing that this method can also be used for the creation of microchannels in solid oxide fuel cells.
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Details
- Title
- ADDITIVE MANUFACTURING WITH FUGITIVE MATERIALS FOR MICROFEATURED CERAMICS AND DESIGN OPTIMIZATION FOR HEAT EXCHANGE APPLICATIONS
- Creators
- Preston Goodall
- Contributors
- Dustin McLarty (Advisor)Konstantin Matveev (Committee Member)Prashanta Dutta (Committee Member)
- Awarding Institution
- Washington State University
- Academic Unit
- Voiland College of Engineering and Architecture
- Theses and Dissertations
- Master of Science (MS), Washington State University
- Publisher
- Washington State University
- Number of pages
- 121
- Identifiers
- 99900606554601842
- Language
- English
- Resource Type
- Thesis