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RISS 인기검색어
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- 저자 : 하피줘 라흐만(Hafizur Rehman) (검색결과 1 건)
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Dispersion Behavior of Al₂O₃-H₂O Nanofluids with Dependence of Time
하피줘 라흐만(Hafizur Rehman),여철모(Chul-Mo Yeo),정현권(Hyun-Gweon Jeong),정효민(Hyomin Jeong),정한식(Hanshik Chung) 대한설비공학회 2011 대한설비공학회 학술발표대회논문집 Vol.2011 No.7
Nanofluids are kind of engineering material, with a new challenge for thermal sciences provided by nanotechnology. Nanofluids are being investigated for numerous applications, including cooling process, manufacturing process, chemical process pharmaceutical process and medical treatment process etc. Nanofluids are basically the suspension of solid nanoparticles with size typically 1- 100 ㎚ in base fluid. In current research, Alumina size less than 50㎚ has been used. The tested fluids have been prepared by dispersing Al₂O₃ into DI water at three different conditions by using 1%wt, 3%wt. and 5%wt. concentrations of alumina without using any surfactant. To ensure the best dispersion and stability of alumina nanoparticles in DI water ultrasonicator with 47㎑ frequency and dispersion time until 3hrs has been used. Particles sedimentation test of these different condition nanofluid samples has been critically observed until 30days. As per result, after 30 days approximately 28% particles sedimentation of Al₂O₃ nanofluid with ultrasonicator dispersion time 3hrs recorded in 3%wt and 21% recorded in 5%wt concentration. Also particle size system (PSS) result of 3%wt and 5%wt concentration of Al₂O₃ nanofluid with dispersion time 3hrs achieved as 46nm and 60nm respectively. The present research will be helpful to investigate the dispersion behavior of water-based Al₂O₃ nanofluid with changing rate of time and also helpful to select different conditions for making Al₂O₃ nanofluid without using surfactants or any other surface additives to use further in heat transfer processes.
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