Investigation of Boiling Heat Transfer Properties On a Nano-coating Surface Modified by Pool Boiling
Date Issued
2014
Date
2014
Author(s)
Chen, Hung-Hsia
Abstract
Critical heat fluxes (CHF) and boiling heat transfer coefficient (BHT) are the primary concerned properties in the design of electrical component cooling or nuclear reactor.
Various concentrations and particle sizes of suspension SiO2 nanoparticles in pure water, called nanofluids, were manipulated in subcooled pool boiling experiment in this study. After nanofluids boiling experiment, the porous nano-coated surfaces were boiling again with pure water in pool. During boiling, nanoparticles in the nanofluids deposit on the bare copper heater surface continuously, which is porous and hydrophilic, leading to a higher CHF compared to pure water. The results showed that all the CHF of plain surfaces with nanofluids and nano-coated surface with pure water experiments were enhanced significantly compared with pure water. It also showed that part of the BHT of bare surface and nanocoated surface were improved but also some of them were deteriorated compared with pure water.
Subjects
奈米修飾銅表面
粒徑大小
臨界熱通量
沸騰熱傳係數
Type
thesis
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