Surface Radiative Transfer in Gas-to-Gas Cocurrent Microheat Exchanger
DSpace at IIT Bombay
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Title |
Surface Radiative Transfer in Gas-to-Gas Cocurrent Microheat Exchanger
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Creator |
MAHULIKAR, SP
HERWIG, H ZHOU, JW SODHANI, YM |
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Subject |
MULTISCALE DESIGN OPTIMIZATION
MICROCHANNEL HEAT-EXCHANGERS AXIAL CONDUCTION PERFORMANCE CHANNEL microheat exchanger radiative transfer volumetric heat transfer coefficient |
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Description |
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. (C) 2010 American Institute of Chemical Engineers AIChE J, 57: 40-50, 2011
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Publisher |
JOHN WILEY & SONS INC
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Date |
2012-06-26T03:37:27Z
2012-06-26T03:37:27Z 2011 |
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Type |
Article
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Identifier |
AICHE JOURNAL,57(1)40-50
0001-1541 http://dx.doi.org/10.1002/aic.12250 http://dspace.library.iitb.ac.in/jspui/handle/100/13880 |
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Language |
English
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