Heat transfer and thermal stress analysis in grooved tubes

Heat transfer and thermal stresses, induced by temperature differences in the internally grooved tubes of heat transfer equipment, have been analysed numerically. The analysis has been conducted for four different kinds of internally grooved tubes and three different mean inlet water velocities. Constant temperature was applied from the external surface of the tube. Energy and governing flow equations were solved using finite difference scheme. Finite element method (FEM) was used to compute the thermal stress fields. Grooving effects on the thermal stress ratio have been discussed. As a result, maximum thermal stress occurs in the case ofp =d for all water inlet velocities. The maximum thermal stress ratio positions inside the tube have been indicated as MX for all investigated cases. In the light of the thermal stress values, various designs can be applied to reduce thermal stress in grooved tubes.

[1]  Miles Greiner,et al.  Simulations of Three-Dimensional Flow and Augmented Heat Transfer in a Symmetrically Grooved Channel With Constant Temperature Walls , 1997, Heat Transfer: Volume 3.

[2]  Yue-Tzu Yang,et al.  Calculation of turbulent flow and heat transfer in a porous-baffled channel , 2003 .

[3]  Veysel Ozceyhan,et al.  Conjugate heat transfer and thermal stress analysis of wire coil inserted tubes that are heated externally with uniform heat flux , 2005 .

[4]  M. Kedzierski,et al.  Horizontal Convective Condensation of Alternative Refrigerants Within a Micro-Fin Tube , 1997 .

[5]  H. Wang,et al.  Condensation of refrigerants in horizontal microfin tubes , 2003 .

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

[7]  Phil Ligrani,et al.  Comparison of Heat Transfer Augmentation Techniques , 2003 .

[8]  W. Kays,et al.  Turbulent Prandtl number : where are we ? , 1994 .

[9]  R. Wirtz,et al.  Correlation of fully developed heat transfer and pressure drop in a symmetrically grooved channel , 1999 .

[10]  Bengt Sundén,et al.  Performance comparison of some tube inserts , 2002 .

[11]  J. H. Faupel,et al.  Engineering design: A synthesis of stress analysis and materials engineering , 1981 .

[12]  Ventsislav Zimparov,et al.  Energy conservation through heat transfer enhancement techniques , 2002 .

[13]  Bekir Sami Yilbas,et al.  Conjugate heat transfer in fully developed laminar pipe flow and thermally induced stresses , 2000 .

[14]  Arthur E. Bergles,et al.  Heat Transfer Enhancement—The Encouragement and Accommodation of High Heat Fluxes , 1997 .

[15]  Masud Behnia,et al.  Reynolds averaged simulation of flow and heat transfer in ribbed ducts , 2002 .

[16]  Minshan Liu,et al.  Numerical simulation of thermal stress in tube-sheet of heat transfer equipment , 1999 .

[17]  Wu-Shung Fu,et al.  Thermal enhancement in laminar channel flow with a porous block , 1996 .

[18]  T. Newell,et al.  Heat transfer and pressure drop during condensation of refrigerant 134a in an axially grooved tube , 1999 .

[19]  W. Leiner,et al.  Distribution of the heat transfer coefficient in a channel with periodic transverse grooves , 1995 .

[20]  Cila Herman,et al.  Heat transfer enhancement in a grooved channel with curved vanes , 2002 .

[21]  Sutanu Sarkar,et al.  Application of a Reynolds stress turbulence model to the compressible shear layer , 1990 .

[22]  M. Goto,et al.  Condensation and evaporation heat transfer of R410A inside internally grooved horizontal tubes , 2001 .

[23]  R. Shah,et al.  Handbook of single-phase convective heat transfer , 1987 .

[24]  M. Hashmi,et al.  Pulsating flow in circular pipes — the analysis of thermal stresses , 2001 .

[25]  Haruo Uehara,et al.  Correlation between heat transfer and pressure drop in channels with periodically grooved parts , 2001 .

[26]  A. Cavallini,et al.  A New Computational Procedure for Heat Transfer and Pressure Drop During Refrigerant Condensation Inside Enhanced Tubes , 1999 .

[27]  Bekir Sami Yilbas,et al.  Thermal stresses in thick-walled pipes subjected to fully developed laminar flow , 2001 .

[28]  B. Launder,et al.  Lectures in mathematical models of turbulence , 1972 .

[29]  Sutanu Sarkar,et al.  Application of a Reynolds stress turbulence model to the compressible shear layer , 1990 .

[30]  B. Mikic,et al.  Numerical investigation of incompressible flow in grooved channels. Part 1. Stability and self-sustained oscillations , 1986, Journal of Fluid Mechanics.

[31]  D. Choi,et al.  Heat- and mass-transfer analysis for the condensing film flow along a vertical grooved tube , 2001 .

[32]  L. Chamra,et al.  Single-phase heat transfer in micro-fin tubes , 1997 .