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The convective heat transfer for the turbulent flow of water/TiO₂ nanofluid inside helically horizontal corrugated tubes is investigated in this paper using experimental techniques. The tube boundary condition is a uniform wall temperature. The test apparatus was designed and assembled with a test section containing 93 cm copper tubes with internal and external diameters of 7.71 mm and 9.52 mm, respectively. First, the heat transfer characteristics of the distilled water turbulent flow in a plain copper tube were measured preliminarily. Second, various test runs were performed for nanofluids with two nanoparticle concentrations (0.1% and 0.5%), two corrugation depth to diameter ratios (0.0648 and 0.103), two corrugation pitch to diameter ratios (0.917 and 1.297), and two corrugation width to diameter ratios (0.363 and 0.492) that were all within the range of turbulent Reynolds numbers (3000 < Re < 15000). The experimental results reveal that the Nusselt number augments the dual increments in corrugation depth and width and with the decrements in corrugation pitch, particularly for high Reynolds numbers. The nanoparticles have a stronger effect on the heat transfer in helically corrugated tubes with higher corrugation depths and widths as well as lower corrugation pitches. A correlation for the Nusselt number in terms of the helically corrugated tubes is introduced based on the linear regression analysis of the experimental data.

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참고문헌 (19건) : 자료제공( 네이버학술정보 )

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번호 참고문헌 국회도서관 소장유무
1 S. U. S. Choi, Enhancing thermal conductivity of fluid with nanoparticles, Developments and application of Non-Newtonian flows, D.A. Signers and H.P. Wang eds., FED, V. 231/MD, 66 (1995) 99-105. 미소장
2 Convective heat transfer ofnanofluid flow through conduits with different cross-sectional shapes 소장
3 Experimental investigation on convective heat transfer and friction factor in a helically coiled tube with Al₂O₃/water nanofluid 소장
4 The effects of corrugation pitch on the condensation heat transfer coefficient and pressure drop of R-134a inside horizontal corrugated tube 네이버 미소장
5 Y. Dong, L. Huixiong and C. Tingkuan, Pressure drop, heat transfer and performance of single-phase turbulent flow in spirally corrugated tubes, Experimental Thermal and Fluid Science, 24 (2001) 131-138. 미소장
6 HEAT TRANSFER ENHANCEMENT IN A CORRUGATED TUBE 네이버 미소장
7 Convective heat transfer to temperature dependent property fluids in the entry region of corrugated tubes 네이버 미소장
8 Experimental investigation on heat transfer and frictional characteristics of spirally corrugated tubes in turbulent flow at different Prandtl numbers 네이버 미소장
9 MIXED CONVECTION HEAT TRANSFER AND ISOTHERMAL PRESSURE DROP IN CORRUGATED TUBES FOR LAMINAR AND TRANSITION FLOW 네이버 미소장
10 Turbulent heat transfer enhancement in a heat exchanger using helically corrugated tube 네이버 미소장
11 Experimental investigation on the convective heat transfer in straight and coiled corrugated tubes for highly viscous fluids: Preliminary results 네이버 미소장
12 Experimental investigation of turbulent heat transfer and flow characteristics of SiO2/water nanofluid within helically corrugated tubes 네이버 미소장
13 HYDRODYNAMIC AND HEAT TRANSFER STUDY OF DISPERSED FLUIDS WITH SUBMICRON METALLIC OXIDE PARTICLES 네이버 미소장
14 Conceptions for heat transfer correlation of nanofluids 네이버 미소장
15 A. Einstein, Berichtigung zu meiner Arbeit: eine neue Bestimmung der Molekuldimensionen, Annals of Physics, 34(1911) 591-592. 미소장
16 J. C. Maxwell, Treatise on Electricity and Magnetism, Dover Publications, New York (1954). 미소장
17 Experimental studies on heat transfer and friction factor characteristics of Al2O3/water nanofluid in a circular pipe under laminar flow with wire coil inserts 네이버 미소장
18 V. Gnielinski, New equations for heat and mass transfer in turbulent pipe and channel flow, International Journal of Chemical Engineering, 16 (1976) 359-368. 미소장
19 F. P. Incropera, D. DeWitt, T. L. Bergman and A. S. Lavine, Fundamentals of Heat and Mass Transfer, John Wiley &Sons, Hoboken, NJ (2006). 미소장

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