Experimental study of thermal conductivity of titanium oxide nanofluids
Date Issued
2014
Date
2014
Author(s)
Hsieh, Bin-Lun
Abstract
Nanofluid is a liquid suspended with nano-sized particles. It attracts many researchers because the heat conductivity of nanofluids can be enhanced significantly by adding a tiny amount of nano particles into the liquid. However, the mechanisms for the enhancement are still not fully understood. An experimental apparatus was built successfully in this thesis using transient hot wire method incorporated with Wheatstone bridge. The apparatus was validated and applied to measuring the heat conductivity of -water nanofluids for a variety of parameters. The main findings are as follows. The heat conductivity of nanofluids depends weakly on the monomer size, but increases significantly with the volume fraction of the nanofluids, provided the volume fraction is sufficiently low. Aging effect is significant, which reduces the heat conductivity with time because of the agglomeration of particles. The heat conductivity is maximized when the PH value meets the isoelectric point of the nanofluid.
Subjects
二氧化鈦奈米流體
暫態熱線法
熱傳導係數
Type
thesis
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ntu-103-R01543034-1.pdf
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