SiO2 나노유체에서 관의 형상에 따른 열전달 특성에 관한 수치해석 연구
Numerical Study on Heat Transfer Characteristics of Tube Type using SiO2 Nanofluids
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In this paper, the heat transfer performance of nanofluids is predicted by numerical analysis methods. The nanoparticles used in this study is SiO2, with concentrations of 1, 2, 3vol.%, and the base fluid is water. Reynolds number of nanofluids ranges from 10,000 to 50,000. A numerical study on the heat transfer characteristics of nanofluid was conducted using a single-phase model. The temperature of the fluid entering from the inlet of the tube is 293.15K. A constant heat flux of 31,650W/m2 was applied at the wall, and the thickness of the wall was ignored. Heat transfer coefficients, thermal conductivity and Nusselt number were selected as indicators for comparing heat transfer performance of nanofluids. As the nanofluid concentration increases, the temperature and velocity distribution by the cross section of the coil tube and straight tube increased. As the Reynolds number increases, temperature difference between inner direction and outer direction reduced in coil tube. For straight tube, the temperature difference between the wall and the center of the tube also decreased.
Abstract
In this paper, the heat transfer performance of nanofluids is predicted by numerical analysis methods. The nanoparticles used in this study is SiO2, with concentrations of 1, 2, 3vol.%, and the base fluid is water. Reynolds number of nanofluids ranges from 10,000 to 50,000. A numerical study on the heat transfer characteristics of nanofluid was conducted using a single-phase model. The temperature of the fluid entering from the inlet of the tube is 293.15K. A constant heat flux of 31,650W/m2 was applied at the wall, and the thickness of the wall was ignored. Heat transfer coefficients, thermal conductivity and Nusselt number were selected as indicators for comparing heat transfer performance of nanofluids. As the nanofluid concentration increases, the temperature and velocity distribution by the cross section of the coil tube and straight tube increased. As the Reynolds number increases, temperature difference between inner direction and outer direction reduced in coil tube. For straight tube, the temperature difference between the wall and the center of the tube also decreased.
참고문헌 (10)
- Fotukian, S. M., "Experimental study of turbulent convective heat transfer and pressure drop of dilute CuO", water nanofluid inside a circular tube, 2010, pp.37(2), 214~219
- Enhancing thermal conductivity of fluids with nanoparticles, "Choi, Stephen US", Argonne National Lab, ~, pp.No. ANL (1995), MSD[DOI]
- Pak, Bock Choon, "Hydrodynamic and heat transfer study of dispersed fluids with submicron metallic oxide particles", Experimental Heat Transfer an International Journal, 11(2), pp.151~170 (1998)
- Khanafer, Khalil, "A critical synthesis of thermophysical characteristics of nanofluids", International journal of heat and mass transfer, 54(19-20), pp.4410~4428 (2011)
- Gherasim, Iulian, "Experimental investigation of nanofluids in confined laminar radial flows", International Journal of Thermal Sciences, 48(8), pp.1486~1493 (2009)
- Bianco, Vincenzo, "Numerical investigation on nanofluids turbulent convection heat transfer inside a circular tube", International Journal of Thermal Sciences, 50(3), pp.341~349 (2011)
- Maiga, Sidi El Bécaye, "Heat transfer behaviours of nanofluids in a uniformly heated tube", Superlattices and Microstructures, 35(3-6), pp.543~557 (2004)
- Sumin Lee, "Numerical study on nanofluid characteristics in helically coiled tube-in- tube heat exchanger using single phase and two phase approaches", Master’s, pp.2019
- Li, Calvin H, "Experimental investigation of temperature and volume fraction variations on the effective thermal conductivity of nanoparticle suspensions (nanofluids)", Journal of Applied Physics, 99(8), pp.084314~ (2006)
- Hamilton, R. L, "Thermal conductivity of heterogeneous two-component systems", Industrial & Engineering chemistry fundamentals, 1(3), pp.187~191 (1962)