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RISS 인기검색어
- 검색키워드
- 저자 : R. Tamilarasan (검색결과 2 건)
- 무료
- 기관 내 무료
- 유료
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P. C. Mukesh Kumar,J. Kumar,R. Tamilarasan,S. Sendhil Nathan,S. Suresh 대한기계학회 2014 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.28 No.5
In this experimental investigation, the heat transfer and pressure drop analysis of a shell and helically coiled tube heat exchanger by using Al₂O₃ / water nanofluids have been carried out under turbulent flow condition. The Al₂O₃/ water nanofluids of 0.1%, 0.4%, and 0.8%particle volume concentration have been prepared by using two step method. The tube side experimental Nusselt number of 0.1%, 0.4%and 0.8% nanofluids were found to be 28%, 36% and 56%, respectively higher than water. These enhancements are due to higher thermalconductivity of nanofluid, better fluid mixing and strong secondary flow formation in coiled tube. The pressure drop of 0.1%, 0.4%and 0.8% were found to be 4%, 6%, and 9%, respectively higher than water. The increase in pressure drop is due to increase in nanofluidviscosity while adding nanoparticles. The measurement of nanofluid thermal performance factor is found to be greater than unity. It isconcluded that the Al₂O₃ nanofluid can be applied as a coolant in helically coiled tube heat exchanger to enhance heat transfer with negligiblepressure drop.
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P. C. Mukesh Kumar,K. Palanisamy,J. Kumar,R. Tamilarasan,S. Sendhilnathan 대한기계학회 2015 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.29 No.2
In this investigation, the heat transfer coefficient and pressure drop of a helically coiled tube heat exchanger handling Al2O3/ waternanofluids is made by using computational fluid dynamics fluent (CFD) software package. This was done under laminar flow conditionin the Dean number (De) range of 1650-2650 and the nanoparticles volume concentration of 0.1%, 0.4% and 0.8%. The effect of someimportant parameters such as nanoparticle volume concentration and Dean number (De) on heat transfer and pressure drop is studied. The coiled tube side Nusselt number (Nu) is found to be 30% higher than water at maximum De. The maximum pressure drop is found to be9% higher than water. It is also found that the Nu and pressure drop significantly increase with increasing particle volume concentrationand De. It is also found that the experimental friction factor increases with increasing the particle volume concentration and De. The CFDNu and pressure drop results have been compared with the experimental and theoretical results. On comparison, it is found that the CFDsimulation results show good agreement with the experimental and theoretical results. It is concluded that the CFD approach gives goodprediction for heat transfer coefficient and pressure drop in a shell and helically coiled tube heat exchanger using Al2O3/ water nanofluids. The average relative error between experimental Nu, pressure drop results and CFD results are found to be 8.5% and 9.5% respectively.
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