A comparison of thermal characteristics of Al₂O₃/water and CuO/water nanofluids in transition flow through a straight circular duct fitted with helical screw tape inserts

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• 作者：S. Suresh^a ; ^{ssuresh@nitt.edu} ; K.P. Venkitaraj^a ; ^{kpvraj@gmail.com} ; P. Selvakumar^a ; ^{rpselvakumar@gmail.com} ; M. Chandrasekar^b ; ^{shekarpunchu@yahoo.com}
• 关键词：Al2O3/water ; CuO/water ; Nanofluids ; Transition flow ; Helical screw tape inserts
• 刊名：Experimental Thermal and Fluid Science
• 出版年：2012
• 期刊代码：28_08941777
• 类别：ce
• 出版时间：May, 2012
• 卷：39
• 期：Complete
• 页码：37-44
• 文件大小：798 K

摘要

A comparison of thermal characteristics of Al₂O₃/water and CuO/water nanofluids in transition flow through a straight circular duct fitted with helical screw tape inserts was made in this study. The helical screw tape inserts with twist ratios Y = 1.78, 2.44 and 3 were used in the experimental study using 0.1%volume concentration Al₂O₃/water and CuO/water nanofluid. The average enhancements in Nusselt number for water with twist ratios of 1.78, 2.44 and 3 were 156.24%, 122.16%and 89.22%respectively when compared to plain tube. The average increase in Nusselt number corresponding to the twist ratios of 1.78, 2.44 and 3 were 166.84%, 128.67%and 89.22%respectively for Al₂O₃/water nanofluid. In the case of CuO/water nanofluid, the enhancements in Nusselt number were 179.82%, 144.29%and 105.63%for twist ratios 1.78, 2.44 and 3 respectively. Thermal performance analysis based on the constant pumping power criteria shows that helical screw tape inserts give better thermal performance when used with CuO/water nanofluid than with Al₂O₃/water nanofluid.