Enhancement of the critical heat flux in saturated pool boiling of water by nanoparticle-coating and a honeycomb porous plate

Various surface modifications of the boiling surface, e.g., integrated surface structures, such as channels and micro-pin fins, and the coating of a micro-porous layer using sintered metal powders and nanoparticle deposition onto the heat transfer surface, have been proven to effectively enhance t...

Full description

Bibliographic Details
Main Authors:	Mori, Shoji, Mt Aznam, Suazlan, Okuyama, Kunito
Format:	Article
Language:	English English
Published:	Elsevier Ltd 2015
Subjects:	TP155 Chemical engineering
Online Access:	http://irep.iium.edu.my/60100/ http://irep.iium.edu.my/60100/ http://irep.iium.edu.my/60100/ http://irep.iium.edu.my/60100/1/1mori2015.pdf http://irep.iium.edu.my/60100/7/60100_Enhancement%20of%20the%20critical%20heat%20flux%20_scopus.pdf

id	iium-60100
recordtype	eprints
spelling	iium-601002017-12-14T13:46:51Z http://irep.iium.edu.my/60100/ Enhancement of the critical heat flux in saturated pool boiling of water by nanoparticle-coating and a honeycomb porous plate Mori, Shoji Mt Aznam, Suazlan Okuyama, Kunito TP155 Chemical engineering Various surface modifications of the boiling surface, e.g., integrated surface structures, such as channels and micro-pin fins, and the coating of a micro-porous layer using sintered metal powders and nanoparticle deposition onto the heat transfer surface, have been proven to effectively enhance the critical heat flux (CHF) in saturated pool boiling. In particular, novel methods involving nanofluids have gained a great deal of attention because the CHF for the use of nano-fluids is increased drastically, by up to approximately three times compared to that of pure water. CHF enhancement using nanofluids is related to surface wettability, surface roughness, and capillary wicking performance due to nanoparticle deposition on the heated surface. Several studies have proposed the use of nanofluids to enhance the in-vessel retention (IVR) capability in the severe accident management strategy implemented at certain light-water reactors. Systems using nanofluids for IVR must be applicable to large-scale systems, i.e., sufficiently large heated surfaces compared to the characteristic length of boiling (capillary length). However, as for the effect of the size of heater with nanoparticle deposition, it was revealed that the CHF tends to be decreased with the increased heater size. On the other hand, the CHF in saturated pool boiling of water using a honeycomb porous plate was shown experimentally to become approximately twice that of a plain surface with a heated surface diameter of 30 mm, which is comparatively large. The enhancement is considered to result from the capillary supply of liquid onto the heated surface through the microstructure and the release of vapor generated through the channels. In the present paper, in order to enhance the CHF on a large heated surface, the effects of a honeycomb porous plate and/or nanoparticle deposited heat transfer surface on the CHF were investigated experimentally. As a result, the CHF was enhanced greatly by the attachment of a honeycomb porous plate to the modified heated surface by nanoparticle deposition, even in the case of a large heated surface. Under the best performing surface modifications, the CHF for 10-mm-, 30-mm- and 50-mm-diameter surfaces was enhanced up to 3.1, 2.3, and 2.2 MW/m2 , respectively. Elsevier Ltd 2015-01 Article PeerReviewed application/pdf en http://irep.iium.edu.my/60100/1/1mori2015.pdf application/pdf en http://irep.iium.edu.my/60100/7/60100_Enhancement%20of%20the%20critical%20heat%20flux%20_scopus.pdf Mori, Shoji and Mt Aznam, Suazlan and Okuyama, Kunito (2015) Enhancement of the critical heat flux in saturated pool boiling of water by nanoparticle-coating and a honeycomb porous plate. International Journal of Heat and Mass Transfer, 80. pp. 1-6. ISSN 0017-9310 https://www.sciencedirect.com/science/article/pii/S0017931014007443 10.1016/j.ijheatmasstransfer.2014.08.046
repository_type	Digital Repository
institution_category	Local University
institution	International Islamic University Malaysia
building	IIUM Repository
collection	Online Access
language	English English
topic	TP155 Chemical engineering
spellingShingle	TP155 Chemical engineering Mori, Shoji Mt Aznam, Suazlan Okuyama, Kunito Enhancement of the critical heat flux in saturated pool boiling of water by nanoparticle-coating and a honeycomb porous plate
description	Various surface modifications of the boiling surface, e.g., integrated surface structures, such as channels and micro-pin fins, and the coating of a micro-porous layer using sintered metal powders and nanoparticle deposition onto the heat transfer surface, have been proven to effectively enhance the critical heat flux (CHF) in saturated pool boiling. In particular, novel methods involving nanofluids have gained a great deal of attention because the CHF for the use of nano-fluids is increased drastically, by up to approximately three times compared to that of pure water. CHF enhancement using nanofluids is related to surface wettability, surface roughness, and capillary wicking performance due to nanoparticle deposition on the heated surface. Several studies have proposed the use of nanofluids to enhance the in-vessel retention (IVR) capability in the severe accident management strategy implemented at certain light-water reactors. Systems using nanofluids for IVR must be applicable to large-scale systems, i.e., sufficiently large heated surfaces compared to the characteristic length of boiling (capillary length). However, as for the effect of the size of heater with nanoparticle deposition, it was revealed that the CHF tends to be decreased with the increased heater size. On the other hand, the CHF in saturated pool boiling of water using a honeycomb porous plate was shown experimentally to become approximately twice that of a plain surface with a heated surface diameter of 30 mm, which is comparatively large. The enhancement is considered to result from the capillary supply of liquid onto the heated surface through the microstructure and the release of vapor generated through the channels. In the present paper, in order to enhance the CHF on a large heated surface, the effects of a honeycomb porous plate and/or nanoparticle deposited heat transfer surface on the CHF were investigated experimentally. As a result, the CHF was enhanced greatly by the attachment of a honeycomb porous plate to the modified heated surface by nanoparticle deposition, even in the case of a large heated surface. Under the best performing surface modifications, the CHF for 10-mm-, 30-mm- and 50-mm-diameter surfaces was enhanced up to 3.1, 2.3, and 2.2 MW/m2 , respectively.
format	Article
author	Mori, Shoji Mt Aznam, Suazlan Okuyama, Kunito
author_facet	Mori, Shoji Mt Aznam, Suazlan Okuyama, Kunito
author_sort	Mori, Shoji
title	Enhancement of the critical heat flux in saturated pool boiling of water by nanoparticle-coating and a honeycomb porous plate
title_short	Enhancement of the critical heat flux in saturated pool boiling of water by nanoparticle-coating and a honeycomb porous plate
title_full	Enhancement of the critical heat flux in saturated pool boiling of water by nanoparticle-coating and a honeycomb porous plate
title_fullStr	Enhancement of the critical heat flux in saturated pool boiling of water by nanoparticle-coating and a honeycomb porous plate
title_full_unstemmed	Enhancement of the critical heat flux in saturated pool boiling of water by nanoparticle-coating and a honeycomb porous plate
title_sort	enhancement of the critical heat flux in saturated pool boiling of water by nanoparticle-coating and a honeycomb porous plate
publisher	Elsevier Ltd
publishDate	2015
url	http://irep.iium.edu.my/60100/ http://irep.iium.edu.my/60100/ http://irep.iium.edu.my/60100/ http://irep.iium.edu.my/60100/1/1mori2015.pdf http://irep.iium.edu.my/60100/7/60100_Enhancement%20of%20the%20critical%20heat%20flux%20_scopus.pdf
first_indexed	2023-09-18T21:25:11Z
last_indexed	2023-09-18T21:25:11Z
_version_	1777412143777316864

Enhancement of the critical heat flux in saturated pool boiling of water by nanoparticle-coating and a honeycomb porous plate

Similar Items