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Effect of Base Fluid on Pool Boiling of Silica Nanofluids and Variation of Surface Roughness
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DOR
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20.1001.2.9919199705.1399.11.1.154.9
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نویسنده
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- - ,- - ,- -
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منبع
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كنگره مهندسي شيمي - 1399 - دوره : 11 - یازدهمین کنگره بین المللی مهندسی شیمی - کد همایش: 99191-99705
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چکیده
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In this work pool boiling of silica nanofluid by two different base fluids were investigated, experimentally# roughness effects on pool boiling heat transfer of silica nanofluid and characteristics of boiling under di water and mixture of di water/ethylene glycol (70/30 di#w/eg) as base fluid were examined# the mechanism of roughness effects on pool boiling was explained by measuring the roughness of deposition layer on the boiling surface# evaluation of boiling surface roughness showed that the surface roughness increases with increasing concentration for two base fluids# these experiments were carried out in three different concentrations of 0#006, 0#008, and 0#01(%vol)# the enhancement of criticl heat flux (chf) and deterioration of boiling heat transfer coefficient (bhtc) attributed to different roughness of boiling surface# it was observsed that bhtc enhances with nanopartices concentration (<0#01 vol%) and indicated an optimum in 0#008 (vol%)# according to the our results, it was found that nanofluids based on di water as a base fluid, enhances chf and bhtc more than the nanofluids with di#w/eg base fluid due to (i) the higher thermophysical properties of di water base fluid, (ii) surface roughness was higher for nanofluid with di water based fluid# it was found that the surface with higher roughness had better heat transfer rate due to having more active cavities during boiling#
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کلیدواژه
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Nanofluid Pool Boiling ,Surface Roughness ,Critical Heat Flux ,Boiling Heat Transfer Coefficient ,Base Fluid
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آدرس
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Isfahan University Of Technology, Iran, Isfahan University Of Technology, Iran, Isfahan University Of Technology, Iran
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Authors
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