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ISSN Online: 2377-424X

ISBN Print: 978-1-56700-474-8

ISBN Online: 978-1-56700-473-1

International Heat Transfer Conference 16
August, 10-15, 2018, Beijing, China

EFFECT OF PARTICLE SIZE AND SIZE POLYDISPERSITY ON SUPERCOOLING DEGREE OF N-HEPTADECANE MICROCAPSULES

Get access (open in a dialog) DOI: 10.1615/IHTC16.tpm.022840
pages 8842-8849

要約

A coaxial microfluidic method was applied in the preparation of microencapsulated phase change materials. The prepared microcapsules had controllable sizes ranging from 110μm to 540μm and low size polydispersities less than 3%. The micro-observation method was adopted to measure the solidification processes of the microcapsules with high monodispersity as well as the microcapsules with high polydispersity obtained by mixing microcapsules with different particle sizes. The effects of particle size and size polydispersity on the supercooling degree of the microcapsules were investigated. The results showed that for the microcapsules with high monodispersity, the supercooling degree was reduced with increasing particle size. A 41.2% reduction in supercooling degree was obtained as the particle size increased from 110μm to 540μm. Whereas, there weren't any specific rules to follow for the microcapsules with high polydispersity. Moreover, the supercooling degree of the microcapsules with high polydispersity might be higher or lower than that of microcapsules with high monodispersity at the same average particle size.