Prediction of heat transfer coefficients of shell and coiled tube heat exchangers using numerical method and experimental validation

Abstract In this work, the heat transfer of shell and helically coiled tube heat exchangers was investigated. Numerical and experimental methods were used to investigate the effect of physical properties of fluid (i.e. viscosity, thermal conductivity, specific heat capacity and density), operational parameters (i.e. the velocity and temperature of fluid) and geometrical parameters (i.e. pitch, diameter of the tube, diameter of shell's inlet, diameters of coil and shell, heights of coil and shell, and the distance between the inlet and outlet of the shell) on Nusselt numbers of both sides. Totally 42 cases and 15 tests were investigated in the numerical analysis and experimental work, respectively. Measurements and analysis were performed, when the steady state was attained. The working fluid of both sides is water, which its viscosity and thermal conductivity were assumed to be dependent on temperature, in the numerical analysis. Results indicate that if the pitch size is doubled, the shell side Nusselt number increases by 10%, while the coil side Nusselt numbers increases by only 0.8%. Also it was found that an increase of 50% in the height and diameter of the shell causes a decrease of 34.1% and 28.3% in the Nusselt number of the shell side, respectively. Based on the results, two correlations were developed to predict Nusselt numbers of coil side and shell side for wide ranges of Reynolds and Prandtl numbers (1000

[1]  M. A. Ebadian,et al.  Turbulent forced convection in a helicoidal pipe with substantial pitch , 1996 .

[2]  J. D. Seader,et al.  Heat and mass transfer phenomena for viscous flow in curved circular tubes , 1972 .

[3]  B. Prasad,et al.  Pressure drop, heat transfer and performance of a helically coiled tubular exchanger , 1989 .

[4]  J. M. Campos,et al.  Heat transfer coefficients from Newtonian and non-Newtonian fluids flowing in laminar regime in a helical coil , 2013 .

[5]  M. Moawed,et al.  Experimental study of forced convection from helical coiled tubes with different parameters , 2011 .

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

[7]  Cheng-Xian Lin,et al.  Developing Turbulent Convective Heat Transfer in Helical Pipes , 1996, Heat Transfer: Volume 2 — Heat Transfer in Turbulent Flows; Fundamentals of Convection Heat Transfer; Fundamentals of Natural Convection in Laminar and Turbulent Flows; Natural Circulation.

[8]  Pallippattu Krishnan Vijayan,et al.  Experimental and CFD estimation of heat transfer in helically coiled heat exchangers , 2008 .

[9]  P. K. Baburajan,et al.  Local heat transfer coefficient in helical coils with single phase flow , 2015 .

[10]  V. Sunnapwar,et al.  Experimental studies on heat transfer to Newtonian and non-Newtonian fluids in helical coils with laminar and turbulent flow , 2013 .

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

[12]  C. J. Hoogendoorn,et al.  Laminar convective heat transfer in helical coiled tubes , 1978 .

[13]  Marko S. Jarić,et al.  Research on the shell-side thermal performances of heat exchangers with helical tube coils , 2012 .

[14]  Andrea Cioncolini,et al.  On the laminar to turbulent flow transition in diabatic helically coiled pipe flow , 2006 .

[15]  Hessam Taherian,et al.  Numerical estimation of mixed convection heat transfer in vertical helically coiled tube heat exchangers , 2011 .

[16]  Hessam Taherian,et al.  Experimental study of mixed convection heat transfer in vertical helically coiled tube heat exchangers , 2010 .

[17]  Kannan N. Iyer,et al.  CFD analysis of single-phase flows inside helically coiled tubes , 2010, Comput. Chem. Eng..

[18]  Davood Domiri Ganji,et al.  Experimental analysis of heat transfer enhancement in shell and helical tube heat exchangers , 2013 .

[19]  Masoud Rahimi,et al.  Prediction of thermal and fluid flow characteristics in helically coiled tubes using ANFIS and GA based correlations , 2012 .

[20]  Mohammad Reza Salimpour,et al.  Heat transfer coefficients of shell and coiled tube heat exchangers , 2009 .

[21]  Liejin Guo,et al.  Turbulent heat transfer in a horizontal helically coiled tube , 1999 .

[22]  Masoud Rahimi,et al.  Prediction of heat transfer and flow characteristics in helically coiled tubes using artificial neural networks , 2012 .