Critical heat flux enhancement in water-based nanofluid with honeycomb porous plate on large heated surface
Heat removal through pool boiling is limited by the phenomena of critical heat flux (CHF). CHF enhancement is vitally important in order to satisfy demand for the cooling technology with high heat flux in In Vessel Retention (IVR). Various surface modifications of the boiling surface, e.g., int...
| Main Authors: | , , |
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| Format: | Conference or Workshop Item |
| Language: | English |
| Published: |
The American Society of Mechanical Engineers
2016
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| Subjects: | |
| Online Access: | http://irep.iium.edu.my/65474/ http://irep.iium.edu.my/65474/ http://irep.iium.edu.my/65474/ http://irep.iium.edu.my/65474/7/65474%20Critical%20Heat%20Flux%20Enhancement.pdf |
| Summary: | Heat removal through pool boiling is limited by the
phenomena of critical heat flux (CHF). CHF enhancement is
vitally important in order to satisfy demand for the cooling
technology with high heat flux in In Vessel Retention (IVR).
Various surface modifications of the boiling surface, e.g.,
integrated surface structures and coating of a micro-porous
have been proven to effectively enhance the CHF in saturated
pool boiling. We have been proposed a novel method of
attaching a honeycomb structured porous plate on a
considerably large heater surface. Previous results, by the
authors in [1] reported that CHF has been enhanced
experimentally up to more than approximately twice that of a
plain surface (approximately 2.0 to 2.5 MW/m2
) with a
diameter of 30 mm heated surface. However, it is necessary
to demonstrate the method together with infinite heater
surface within laboratory scale. It is important that cooling
techniques for IVR could be applicable to a large heated
surface as well as remove high heat flux. Objective of this
study is to investigate the CHF of honeycomb porous plate
and metal solid structure in nanofluid boiling or water boiling
on a large heated surface. Water-based nanofluid offers good
wettability and capillarity. While metal solid structure is
installed on honeycomb porous plate to increase the number
of vapor jet. Experimental results of honeycomb porous plate
and combination of honeycomb porous plate and metal solid
structure in water-based nanofluid boiling shows that CHF is
increased up to twice [2] and thrice, respectively compared to
plain surface in water boiling. To the best of the author’s
knowledge, the highest value (3.1 MW/m2
) was obtained for
a large heated surface having a diameter of 50 mm which is
regarded as infinite heated surface. This demonstrates
potential for general applicability to have more safety margin
in IVR method. |
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