Effects of air vents on the flow of reacting polyurethane foam in a refrigerator cavity

Bedii Özdemir*, Hamed Pahlavani

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

6 Citations (Scopus)


The transport equations for momentum, enthalpy, and chemical species are solved to simulate the reactive flow of polyurethane foam in a refrigerator cavity. The chemical reactions are described by a mechanism with four reactions and eight species. The numerical findings are also supported by dimensional arguments, which lead to important design attributes. Results prove that the model can be used not only to predict the flow features during the expansion of a multi-component foam, but also to determine the locations and the size of the air vents to avoid air bubbles trapped during the solidification process. It appears that the distribution of the vent holes must be evenly balanced around the cabinet cavity, where the larger holes must be located at positions far from the injector. To prevent the formation of large air voids, which cannot reach the vent holes by the action of gravity, there must be additional holes located on the lower surfaces of the cavity to purge the air trapped.

Original languageEnglish
Pages (from-to)2420-2428
Number of pages9
JournalAdvances in Polymer Technology
Issue number7
Publication statusPublished - Nov 2018

Bibliographical note

Publisher Copyright:
© 2017 Wiley Periodicals, Inc.


This study has been funded by the Ministry of Industry (SANTEZ 01213.STZ-2012-1). The partial support by Arcelik Inc. is also acknowledged.

FundersFunder number
Ministry of Economy, Trade and IndustrySANTEZ 01213.STZ-2012-1
Arcelik Inc.


    • computational fluid dynamics
    • injection molding
    • multi-component flow
    • polyurethane foams
    • reactive flow


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