Numerical study on heat transfer and resistance performance of heat exchangers with perforated-baffle structure

HOU Xialing1 ZHOU Guoyan1 TU Shandong1

(1.Key Laboratory of Pressure Systems and Safety, Ministry of Education, School of Mechanical and Power Engineering, East China University of Science and Technology, Shanghai, China 200237)

【Abstract】Based on simplified periodic model and RNG k-ε turbulence model, the flow characteristics and heat transfer properties of shell-side fluid in perforated-baffle heat exchangers were numerically simulated by using CFD software FLUENT. The feasibility and accuracy of numerical simulation method was verified by experiment. The heat transfer and resistance performance of trefoil-baffle, four-leaf-hole baffle, five-leaf-hole baffle, big-hole baffle and small-hole baffle were analyzed. Then, the influences of structural parameters on heat transfer and resistance performance were discussed. Furthermore, the enhancement mechanism of heat transfer of perforated-baffle structure heat exchangers was investigated based on the field synergy principle. The results show that the fluid flow in the shell-side of the perforated-baffle structure heat exchanger can be accurately simulated by using the RNG k-ε turbulence model and the simplified periodic model. The heat transfer coefficient of five-leaf-hole baffle is the best while the resistance the greatest. The heat transfer coefficient of the small-hole baffle is the worst, while the resistance is the least. The heat transfer coefficient and pressure drop decrease when baffle pitch and height cut-out increase. Behind the support plate, the angle between the velocity vector and the temperature gradient varies violently, which enhances the heat transfer in the shell-side. The field synergy angle of five-leaf-hole baffle has the largest fluctuation range, and the enhancement of heat transfer effect is the best.

【Keywords】 perforated-baffle structure; periodicity; heat transfer; computational fluid dynamics; numerical simulation;

【DOI】

【Funds】 National Natural Science Foundation of China (51675181) Shanghai Pujiang Talents Program (14PJD015)

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(Translated by CUI M M)

    References

    [1] FANG S Q, ZHU C J, WU Y, et al. Research progress of strengthened heat transfer technique and new type high efficient heat exchangers [J]. Chemical Engineering & Machinery, 2004, 31 (4): 249–253 (in Chinese).

    [2] QIAN C F, GAO H Y, SUN H Y. Shell-side fluid flow and heat transfer in curved baffle heat exchanger [J]. CIESC Journal, 2011, 62 (5): 1233–1238 (in Chinese).

    [3] DU W J, WANG H F, CHENG L. Shell side fluid flow characteristics in helical baffled heat exchanger [J]. CIESC Journal, 2014, 65 (8): 2970–2975 (in Chinese).

    [4] DONG Q W, DU Q F, LIU M S, et al. Numerical research on flow and heat transfer characteristics in shell-side of heat exchanger with trefoil-tube-support [J]. Process Equipment & Piping, 2012, 49 (2): 21–23 (in Chinese).

    [5] BUTTERWORTH D. A model for heat transfer during three-dimensional flow in tube bundles [C]//6th International Heat Transfer Conference. Toronto, 1978: 219–224.

    [6] YAO L, HAN D, LUO C J, et al. Numerical simulation on shell-side flow and heat transfer of cinquefoil orifice baffle heat exchanger [J]. Energy Chemical Industry, 2017, 38 (1): 85–90 (in Chinese).

    [7] GREEN S J. Thermal hydraulic and corrosion aspects of PWR steam generator problems [J]. Heat Transfer Engineering, 1988, 9 (1): 19–22.

    [8] WANG Y S, LIU Z C, HUANG S Y, et al. Experimental investigation of shell-and-tube heat exchanger with a new type of baffles [J]. Heat&Mass Transfer, 2011, 47 (7): 833–839 (in Chinese).

    [9] LI Y X, LOU Y, ZHAN H R, et al. Three-dimensional numerical simulation of fluid flow and heat transfer in the shell side of quincunx orifice baffle longitudinal flow type heat exchanger [J]. The Chinese Journal of Process Engineering, 2015, 15 (4): 639–645 (in Chinese).

    [10] LUO C J, HAN D, MOU C Y, et al. Numerical simulation study on the effects of orifice structure on the shell-side heat transfer of cinquefoil orifice baffle heat exchanger [J]. Energy Chemical Industry, 2016, 37 (1): 55–59 (in Chinese).

    [11] ZHU L Y, ZHOU G Y, ZHU D S. Progress in investigating heat transfer property of heat exchangers with longitudinal flow in shell side [J]. Chemical Engineering & Machinery, 2014, 41 (3): 269–272 (in Chinese).

    [12] SUN H Y. Field synergy analysis LASH baffle heat exchanger in shell-side [J]. Mechanical Engineering&Automation, 2014, (4): 40–41 (in Chinese).

    [13] EL MAAKOUL A, LAKNIZI A, SAADEDDINE S, et al. Numerical comparison of shell-side performance for shell and tube heat exchangers with trefoil-hole, helical and segmental baffles [J]. Applied Thermal Engineering, 2016, 109: 175–185.

    [14] PATANKAR S V, SPALDING D B. A calculation procedure for the transient and steady state behavior of shell-and-tube heat exchanger [M]//AFGAN A A, SCHLUNDER E U. Heat Exchanger: Design and Theory Source Book. Washington: McG raw-Hill, 1974.

    [15] PRITHIVIRAJ M, ANDREWS M J. Three-dimensional numerical simulation of shell-and-tube heat exchangers (Ⅰ): Foundation and fluid mechanics [J]. Numerical Heat Transfer, Part A: Applications, 1998, 33 (8): 799–816.

    [16] PRITHIVIRAJ M, ANDREWS M J. Three-dimensional numerical simulation of shell-and-tube heat exchangers (Ⅱ): Heat transfer [J]. Numerical Heat Transfer, Part A: Applications, 1988, 33 (8): 817–828.

    [17] PRITHIVIRAJ M, ANDREWS M J. Comparison of a three-dimensional numerical model with existing methods for prediction of flow in shell-and-tube heat exchangers [J]. Heat Transfer Engineering, 1999, 20 (2): 15–19.

    [18] ZENG W L, ZHANG F X, WANG J Q, et al. Numerical investigation of fluid maldistribution of shell-side of shell-and-tube heat exchanger with longitudinal flow [J]. Journal of Hengyang Normal University, 2009, 30 (3): 65–69 (in Chinese).

    [19] DONG Q W, BAI C P, LIU M S, et al. Research on flow and heat transfer in shell-side of the trefoil-baffle support type heat exchanger [J]. Journal of Engineering Thermophysics, 2013, 34 (1): 115–117 (in Chinese).

    [20] DONG Q W, WANG Y Q, LIU M S. Numerical and experimental investigation of shell side characteristics for ROD baffle heat exchanger [J]. Applied Thermal Engineering, 2008, 28 (7): 651–660.

    [21] YOU Y H, CHEN Y Q, XIE M Q, et al. Numerical simulation and performance improvement for a small size shell-and-tube heat exchanger with trefoil-hole baffles[J]. Applied Thermal Engineering, 2015, 89 (5): 220–228.

    [22] YOU Y H, FAN A W, LAI X J, et al. Experimental and numerical investigations of shell-side thermo-hydraulic performances for shell-and-tube heat exchanger with trefoil-hole baffles [J]. Applied Thermal Engineering, 2013, 50 (1): 950–956.

    [23] ZHOU G Y, SHI Y H, GUO Z, et al. A study on the thermal performance of heat exchanger with trefoil-baffles by using unit duct model [J]. Pressure Vessel Technology, 2016, 33 (4): 10–17 (in Chinese).

    [24] WANG D, WANG K, WANG Y Q, et al. Numerical and experimental investigation of the shell side characteristics of the trefoil-hole baffle heat exchanger [J]. Heat Transfer Research, 2017, 48 (1): 81–95.

    [25]WEI Z G, LI H F, KE H B, et al. Analysis on performance and mechanism of heat transfer enhancement of trefoil-hole baffle [J]. Chemical Industry and Engineering Progress, 2017, 36 (2): 465–472 (in Chinese).

    [26]DONG Q W, DU Q F, LIU M S, et al. Numerical research on flow and heat transfer characteristics in shell-side of heat exchanger with trefoil-tube-support [J]. Process Equipment&Piping, 2012, 49 (2): 21–23 (in Chinese).

    [27]ZHU L Y, LANG H F, ZHOU G Y, et al. Numerical simulation on shell side fluid flow and heat transfer in heat exchanger with trefoil-baffles [J]. CIESC Journal, 2014, 65 (3): 829–835 (in Chinese).

    [28]ZHU L Y, YANG J C, ZHOU G Y, et al. Investigation of the thermal performance of heat exchangers with trefoil-baffles [J]. Chemical Industry and Engineering Progress, 2014, 33 (12): 3183–3188 (in Chinese).

    [29]GUO Z. Experimental investigation of the shell-side heat transfer and friction characteristics of shell-and-tube heat exchangers with trefoil-hole baffles [D]. Shanghai: East China University of Science and Technology, 2014 (in Chinese).

    [30] GUO Z Y. Principle of field coordination in heat exchangers and its application [J]. Chinese Journal of Mechanical Engineering, 2003, 39 (12): 1–9 (in Chinese).

This Article

ISSN:0438-1157

CN: 11-1946/TQ

Vol 68, No. 12, Pages 4517-4525+4919

December 2017

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Article Outline

Abstract

  • Introduction
  • 1 Numerical simulation model
  • 2 Comparison and analysis of flow performance of shell fluid
  • 3 Comparison and analysis of heat transfer and resistance performance of shell fluid
  • 4 Comparison and analysis of comprehensive performance
  • 5 Sensitivity analysis of structural parameters
  • 6 Analysis of enhanced heat transfer mechanism
  • 7 Conclusions
  • References