Numerical investigation on baffle configuration improvement of the heat exchanger with helical baffles

Abstract An improved structure of ladder-type fold baffle is proposed to block the triangular leakage zones in original heat exchangers with helical baffles. The numerical results showed that the shell-side tangential velocity and radial velocity in improved heat exchanger increase significantly and the shell-side fluid becomes approximately continuous spiral flow. And the configuration of ladder-type fold baffles was optimized. The numerical results showed that the shell-side heat transfer coefficient of the improved heat exchanger increases by 82.8–86.1%, when the folding ratio φ is 0.3, the baffle height ω is 60%, and the folding angle α is 37°. The associated pumping power penalty is about 21–549 W due to the increased shell-side pressure drop. The thermal performance factor TEF enhances by 28.4–30.7%, which demonstrates that the ladder-type fold baffle effectively improves the heat transfer performance of heat exchangers with helical baffles. The results of this paper are of great significance in the optimal design of heat exchanger.

[1]  Wang Shuli,et al.  Hydrodynamic Studies on Heat Exchangers with Helical Baffles , 2002 .

[2]  Ya-Ling He,et al.  Effects of baffle inclination angle on flow and heat transfer of a heat exchanger with helical baffles , 2008 .

[3]  Yanzhong Li,et al.  An experimental investigation of heat transfer enhancement for a shell-and-tube heat exchanger , 2009 .

[4]  Petr Stehlík,et al.  Different Strategies to Improve Industrial Heat Exchange , 2002 .

[5]  Petr Stehlík,et al.  Comparison of correction factors for shell-and-tube heat exchangers with segmental or helical baffles , 1994 .

[6]  M. R. Hajmohammadi,et al.  Fork-shaped highly conductive pathways for maximum cooling in a heat generating piece , 2013 .

[7]  Mohammad Reza Salimpour,et al.  Detailed analysis for the cooling performance enhancement of a heat source under a thick plate , 2013 .

[8]  Wen-Quan Tao,et al.  3D numerical simulation on shell-and-tube heat exchangers with middle-overlapped helical baffles and continuous baffles – Part I: Numerical model and results of whole heat exchanger with middle-overlapped helical baffles , 2009 .

[9]  Jian Wen,et al.  Experimental investigation on heat transfer enhancement of a heat exchanger with helical baffles through blockage of triangle leakage zones , 2014 .

[10]  Arzu Şencan Şahin,et al.  Design and economic optimization of shell and tube heat exchangers using Artificial Bee Colony (ABC) algorithm , 2011 .

[11]  E. Damangir,et al.  Minimizing capital and operating costs of shell and tube condensers using optimum baffle spacing , 2004 .

[12]  Min Zeng,et al.  Numerical investigation on combined multiple shell-pass shell-and-tube heat exchanger with continuous helical baffles , 2009 .

[13]  J. Lutcha,et al.  Performance improvement of tubular heat exchangers by helical baffles , 1990 .

[14]  Sadegh Poozesh,et al.  Investigations on the internal shape of Constructal cavities intruding a heat generating body , 2012 .

[15]  Joseph W. Palen.  Heat Exchanger Sourcebook , 1986 .

[16]  Farhad Nemati Taher,et al.  Baffle space impact on the performance of helical baffle shell and tube heat exchangers , 2012 .

[17]  Gongnan Xie,et al.  An experimental study of shell-and-tube heat exchangers with continuous helical baffles , 2007 .

[18]  R. Webb,et al.  Forced convection heat transfer in helically rib-roughened tubes , 1980 .

[19]  Petr Stehlík,et al.  Helical Baffles in Shell-and-Tube Heat Exchangers, Part I: Experimental Verification , 1996 .

[20]  H. Kahalerras,et al.  Analysis of fluid flow and heat transfer in a double pipe heat exchanger with porous structures , 2008 .

[21]  M. R. Hajmohammadi,et al.  Improvement of Forced Convection Cooling Due to the Attachment of Heat Sources to a Conducting Thick Plate , 2013 .

[22]  A. Saha,et al.  MIXED CONVECTIVE FLOW AND HEAT TRANSFER THROUGH A HORIZONTAL CHANNEL WITH SURFACE MOUNTED OBSTACLES , 2012 .

[23]  H. Kahalerras,et al.  Analysis of a double pipe heat exchanger performance by use of porous baffles and pulsating flow , 2013 .

[24]  Luo Lai,et al.  EFFECT OF INSERTING BLOCK PLATES ON PRESSURE DROP AND HEAT TRANSFER IN SHELL-AND-TUBE HEAT EXCHANGERS WITH HELICAL BAFFLES , 2001 .

[25]  W. Tao,et al.  Second-Law Based Thermodynamic Analysis of a Novel Heat Exchanger , 2009 .

[26]  Wen-Quan Tao,et al.  3D numerical simulation on shell-and-tube heat exchangers with middle-overlapped helical baffles and continuous baffles – Part II: Simulation results of periodic model and comparison between continuous and noncontinuous helical baffles , 2009 .

[27]  V. Kottke,et al.  Effect of the leakage on pressure drop and local heat transfer in shell-and-tube heat exchangers for staggered tube arrangement , 1998 .

[28]  Sadegh Poozesh,et al.  Constructal design of multiple heat sources in a square-shaped fin , 2012 .

[29]  Bin Li,et al.  Experimental performance comparison of shell-side heat transfer for shell-and-tube heat exchangers with middle-overlapped helical baffles and segmental baffles , 2009 .

[30]  O. Joneydi Shariatzadeh,et al.  Optimal design of unequal heat flux elements for optimized heat transfer inside a rectangular duct , 2014 .

[31]  D. Walraven,et al.  Optimum configuration of shell-and-tube heat exchangers for the use in low-temperature organic Rankine cycles , 2014 .

[32]  Viviani C. Onishi,et al.  Mathematical programming model for heat exchanger design through optimization of partial objectives , 2013 .

[33]  Felix Hueber,et al.  Principles Of Enhanced Heat Transfer , 2016 .

[34]  S. Orszag,et al.  Renormalization group analysis of turbulence. I. Basic theory , 1986 .

[35]  Sadegh Poozesh,et al.  Valuable reconsideration in the constructal design of cavities , 2013 .

[36]  V. Kottke,et al.  Visualization and determination of local heat transfer coefficients in shell-and-tube heat exchangers for staggered tube arrangement by mass transfer measurements , 1998 .

[37]  Pongjet Promvonge,et al.  Thermal performance enhancement in a heat exchanger tube fitted with inclined vortex rings , 2014 .

[38]  K. S. Chunangad,et al.  Fouling Mitigation Using Helixchanger Heat Exchangers , 2003 .