KARAKTERISTIK PERPINDAHAN PANAS KONVEKSI ALAMIAH ALIRAN NANOFLUIDA AL2O3-AIR DI DALAM PIPA ANULUS VERTIKAL
DOI:
https://doi.org/10.17146/tdm.2016.18.1.2328Keywords:
Al2O3-water nanofluids, the natural convection, the vertical annulus pipeAbstract
Results of several research have shown that nanofluids have better thermal characteristics compared to conventional fluid (water). In this regard, currently developing ideas for using nanofluids as an alternative heat transfer fluid in the reactor coolant system. Meanwhile the natural convection in a vertical annulus pipe is one of the important mechanisms of heat transfer and is found at the TRIGA research reactor, the new generation nuclear power plants and other energy conversion devices. On the other hand the heat transfer characteristics of nanofluids in a vertical annulus pipe has not been known. Therefore, it is important to do research continuously to analyze the heat transfer nanofluids in a vertical annulus pipe. In the research has been carried out numerical analysis by using computer code of CFD (computational of fluids dynamic) on natural convection heat transfer characteristics of nanofluids flow of Al2O3-water 2% volume in the vertical annulus pipe. The results showed an increase in heat transfer performance (Nusselt numbers - NU) by 20.5% - 35%. In natural convection mode with Rayleigh numbers 2.4708e+09 £ Ra £ 1.9554e+13 obtained empirical correlations for water is and empirical correlations for Al2O3-water nanofluids is .
References
Buongiorno J. and Hu L.W., Nanofluid heat transfer enhancement for nuclear reactor applications, Journal of Energy and Power Engineering 2010;4(6):1-8.
Chandrasekar M., Suresh S., Senthilkumar T., Mechanisms proposed through experimental investigations on thermophysical properties and forced convective heat transfer characteristics of various nanofluids - A review, Renewable and Sustainable Energy Reviews 2012;16:3917-3938.
https://doi.org/10.1016/j.rser.2012.03.013
Karna E.D., Kristiawan B., Budiana E.P., Studi ekperimental perpindahan kalor konveksi fluida nano Al2O3-prophylene glicol pada circular tube di bawah kondisi fluks kalor konstan, Mekanika 2012;11: 14-21.
Defri Irawan, Budi Kristiawan, Eko Prasetyo Budiana, Studi ekperimental perpindahan kalor konveksi fluida nano Al2O3/ethyline glicol pada circular tube di bawah kondisi fluks kalor konstan, Mekanika 2013;11:101-106.
Liu D and Yu L., Single-Phase Thermal Transport of Nanofluids in a Minichannel, Journal of Heat Transfer 2011;133:031009-1 - 031009-11.
https://doi.org/10.1115/1.4002462
Bozorgan N., Evaluation of Using Al2O3/EG and TiO2/EG nanofluids as coolants in the double-tube heat exchanger, Int. J. Adv. Design and Manufacturing Technology 2012;5(2): 27-34.
Gadge A.B. and Gohel N.S., Effect of heat transfer in circular heat pipe with ethanol methanol and Al2O3 as a nanofluid, The International Journal Of Science & Technoledge 2014;2:397-402.
Zamzamian A., Oskouie S.N., Doosthoseini A., Joneidi A., Pazouki M., Experimental investigation of forced convective heat transfer coefficient in nanofluids of Al2O3/EG and CuO/EG in a double pipe and plate heat exchangers under turbulent flow, Experimental Thermal and Fluid Science 2011;35:495-502.
https://doi.org/10.1016/j.expthermflusci.2010.11.013
Sankar M., Park Y., Lopez J.M., Do Y., Numerical study of natural convection in a vertical porous annulus with discrete heating, International Journal of Heat and Mass Transfer 2011;54:1493-1505.
https://doi.org/10.1016/j.ijheatmasstransfer.2010.11.043
Kamajaya K., Umar E., Sudjatmi, The Empirical correlations for natural convection heat transfer Al2O3 and ZrO2 nanofluid in vertical sub-channel, The 7th International conference and Exhibition on Cooling and Heating Technologies (ICCHT-2014); 2014, Kualalumpur, Malaysia; 2014:1-6.
Nazififard M., Nematollahi M., Jafarpur K., Suh K.Y., Numerical simulation of water-based alumina nanofluid in bubchannel geometry, Hindawi Publishing Corporation, Science and Technology of Nuclear Installations 2012; 2012:1-12.
https://doi.org/10.1155/2012/928406
Hosseini S.Sh., Shahrjerdi A., Vazifeshenas Y., A review of relations for physical properties of nanofluids, Australian Journal of Basic and Applied Sciences 2011;5:417- 435.
