Optimization of design parameters for nanofluids flowing inside helical coils

Abstract In this study water/Al 2 O 3 nanofluid is used in helical tubes. Copper helical tubes are in constant wall temperature and the fluid flow is laminar. Thermophysical properties of Nanofluids are assumed to depend on particles volume fraction and temperature. To analyze the heat transfer rate and pressure drop in helical coils, Nusselt number, friction factor and thermal–hydraulic parameter are used. Numerical simulation and Taguchi method are used to investigate the effect of fluid flow and geometrical parameters on JF factor. After simulations, Taguchi method is used for finding the optimum condition for the desired parameters. Proposed optimum conditions are simulated to insure the obtained results. Results indicate that Nanofluids improve the thermal–hydraulic performance of helical tubes. On the other hand using Nanofluids don't change the optimized shape factors but temperature dependent properties alter the optimum particle volume fraction.

[1]  Eyuphan Manay,et al.  A Taguchi approach for optimization of design parameters in a tube with coiled wire inserts , 2011 .

[2]  Frank P. Incropera,et al.  Fundamentals of Heat and Mass Transfer , 1981 .

[3]  Yulong Ding,et al.  Natural convective heat transfer of suspensions of titanium dioxide nanoparticles (nanofluids) , 2006 .

[4]  S. Wongwises,et al.  A comparison of flow characteristics of refrigerants flowing through adiabatic straight and helical capillary tubes , 2011 .

[5]  Kadir Bilen,et al.  A Taguchi approach for investigation of heat transfer from a surface equipped with rectangular blocks , 2001 .

[6]  D. B. Spalding,et al.  Prediction of laminar flow and heat transfer in helically coiled pipes , 1974, Journal of Fluid Mechanics.

[7]  C. T. Nguyen,et al.  Numerical Investigation of Electronic Component Cooling Enhancement Using Nanofluids in a Radial Flow Cooling System , 2006 .

[8]  T. R. Bement,et al.  Taguchi techniques for quality engineering , 1995 .

[9]  Krishna D.P. Nigam,et al.  Numerical studies of a tube-in-tube helically coiled heat exchanger , 2008 .

[10]  R. C. Xin,et al.  The effects of prandtl numbers on local and average convective heat transfer characteristics , 1997 .

[11]  C. T. Nguyen,et al.  Heat transfer enhancement with the use of nanofluids in radial flow cooling systems considering temperature-dependent properties , 2006 .

[12]  T. Mckrell,et al.  Laminar convective heat transfer and viscous pressure loss of alumina–water and zirconia–water nanofluids , 2009 .

[13]  Y. Xuan,et al.  Investigation on Convective Heat Transfer and Flow Features of Nanofluids , 2003 .

[14]  Kuen Ting,et al.  Entropy generation and thermodynamic optimization of fully developed laminar convection in a helical coil , 2005 .

[15]  Stephen U. S. Choi.  Enhancing thermal conductivity of fluids with nano-particles , 1995 .

[16]  Kwan-Soo Lee,et al.  Influence of design parameters on the heat transfer and flow friction characteristics of the heat exchanger with slit fins , 2000 .

[17]  Yulong Ding,et al.  Formulation of nanofluids for natural convective heat transfer applications , 2005 .

[18]  Wenhua Yu,et al.  The Role of Interfacial Layers in the Enhanced Thermal Conductivity of Nanofluids: A Renovated Maxwell Model , 2003 .

[19]  G.S.V. Raghavan,et al.  Comparison of heat transfer rates between a straight tube heat exchanger and a helically coiled heat exchanger , 2002 .

[21]  Somchai Wongwises,et al.  A review of flow and heat transfer characteristics in curved tubes , 2006 .

[22]  Hossein Shokouhmand,et al.  Experimental investigation of shell and coiled tube heat exchangers using wilson plots , 2008 .

[23]  Mohammad Reza Salimpour,et al.  Heat transfer characteristics of a temperature-dependent-property fluid in shell and coiled tube heat exchangers , 2008 .

[24]  J. Buongiorno.  Convective Transport in Nanofluids , 2006 .

[25]  Edward W. Merrill,et al.  Effect of secondary fluid motion on laminar flow heat transfer in helically coiled tubes , 1971 .

[26]  D. Che,et al.  Numerical studies on flow and heat transfer in membrane helical-coil heat exchanger and membrane serpentine-tube heat exchanger ☆ , 2011 .

[27]  Gilles Roy,et al.  Experimental investigation of nanofluids in confined laminar radial flows , 2009 .