期刊
CASE STUDIES IN THERMAL ENGINEERING
卷 12, 期 -, 页码 833-842出版社
ELSEVIER
DOI: 10.1016/j.csite.2018.11.002
关键词
Al2O3-water nanofluid; Mixed convection; Thermal buoyancy effect; Wall conduction effect; Minichannel
资金
- Ministry of Science and Technology, Taiwan [MOST 106-2221-E-027-103]
- Research Center of Energy Conservation for New Generation of Residential, Commercial, and Industrial Sectors from The Featured Areas Research Center Program by the Ministry of Education (MOE) in Taiwan
The effect of highly conducive thick walls on the mini channel heat transfer performance is systematically addressed while two constant heat flux sources are considered at the bottom of the channel. The influence of using different mass fractions of Al2O3 nanoparticles dispersed in water as working fluid are studied. The buoyancy effects on the thermal performance and pressure drop of the mini channel are also investigated. The finite volume method is employed to simulate the flow and heat transfer of nanofluid in the channel. The results show that the axial heat transfer is an important effect in mini channels with thermal conducive walls and should be taken into account. It is found that the presence of nanoparticles with the mass fraction of 5% and 10% drops the maximum temperature (and increases the pressure drop) by 1.28% (17.0%) and 1.48% (41.0%), respectively when Reynolds number is 500 and neglecting buoyancy effects. The presence of buoyancy effects reduces the pressure drop by 21.08% in a case with Reynolds number 500 and the nanoparticles mass fraction 5%. This is while the presence of buoyancy effects would decrease the maximum temperature by 1 degrees C.
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