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Surface radiative transfer in gas-to-gas cocurrent microheat exchanger
Publikationstyp
Journal Article
Date Issued
2011
Sprache
English
Author(s)
Journal
Volume
57
Issue
1
Start Page
40
End Page
50
Citation
AIChE Journal 57 (1): 40-50 (2011)
Publisher DOI
Scopus ID
Publisher
Wiley
The influence of surface radiative transfer in parallel flow microheat exchanger is numerically studied for its importance at high temperatures and for small flow dimensions. For these heat exchangers, the role of radiation is beneficial when the convective heat transfer to the annulus flow exceeds the convective heat transfer from the core flow. For this case, radiation improves the heat exchanger performance by decreasing the logarithmic mean temperature difference and by increasing the capacity, effectiveness, and volumetric heat transfer coefficient. Additional surface area is made available for convection to the annulus flow, thereby increasing the specific heat transfer surface for fixed geometry. Therefore, a high emissivity layer over the surfaces of microheat exchanger can improve the heat exchange performance. The active heat transfer area weighted by the convective heat flow rates is introduced as the true measure of heat exchanger compactness.
Subjects
Microheat exchanger
Radiative transfer
Volumetric heat transfer coefficient
DDC Class
620: Engineering