University of Twente Student Theses


Optimizing Geometric Parameters of a Coaxial Nozzle for Direct Bubble Writing

Zuiderduin, E.R. (2019) Optimizing Geometric Parameters of a Coaxial Nozzle for Direct Bubble Writing.

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Abstract:Cellular materials such as foams appear widely in nature and are manufactured on a large scale by man. Solid foam structures with locally controllable density, pore size and interconnectivity of cells allow for high performance acoustic structures and gradient based tissue scaffolding which could accurately mimic a native tissue architecture. However, conventional production methods are unable to produce these tunable foams. Direct bubble writing is a novel foam production platform (unpublished) on which already foam structures have been produced. This research presents the development of a 3D foam printer and a study on the bubble formation dynamics which is dependent on nozzle geometry and incoming gas and liquid flow. Core-shell nozzles have been designed with varying internal geometries. The ejection phase at varying liquid flow rate and gas pressure have been observed. From these results the relevant control parameters of the nozzle design were found. Using a previously found pressure model, dimensionless results were obtained and these were used to gain more insight in the ejection dynamics and this can be used as a prediction model for nozzles at different scales and varying liquids.
Item Type:Essay (Master)
Faculty:ET: Engineering Technology
Subject:52 mechanical engineering
Programme:Mechanical Engineering MSc (60439)
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