Characteristics of flow and heat transfer of shell-and-tube heat exchangers with overlapped helical baffles

doi:10.1007/s42524-019-0005-8

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Abstract：

The characteristics of flow and heat transfer of shell-and-tube heat exchangers with overlapped helical baffles (STHXsHB) were illustrated through a theoretical analysis and numerical simulation. The ideal helical flow model was constructed to demonstrate parts of the flow characteristics of the STHXsHB, providing theoretical evidence of short-circuit and back flows in a triangular zone. The numerical simulation was adopted to describe the characteristics of helical, leakage, and bypass streams. In a fully developed section, the distribution of velocity and wall heat transfer coefficient has a similar trend, which presents the effect of leakage and bypass streams. The short-circuit flow accelerates the axial velocity of the flow through the triangular zone. Moreover, the back flow enhances the local heat transfer and causes the ascent of flow resistance. This study shows the detailed features of helical flow in STHXsHB, which can inspire a reasonable optimization on the shell-side structure.

Keywords heat exchanger overlapped helical baffle triangular zone helical flow

在线预览日期: 发布日期: 2019-03-12

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	Tingting DU
	Wenjing DU

引用本文:

Tingting DU,Wenjing DU. Characteristics of flow and heat transfer of shell-and-tube heat exchangers with overlapped helical baffles[J]. Front. Eng, 2019, 6(1): 70-77.

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https://journal.hep.com.cn/fem/EN/10.1007/s42524-019-0005-8 OR https://journal.hep.com.cn/fem/EN/Y2019/V6/I1/70

Fig.1 Principle of the heat exchanger with helical baffles (^{Lutcha and Nemcansky, 1990})

Fig.2 Geometrical model of the STHXsHB

Tab.1 Parameters of the STHXsHB

Fig.3 Grid independence verification

Fig.4 Shell-side pressure drop comparison between the simulation and experimental results

Fig.5 Shell-side heat transfer coefficient comparison between the simulation and experimental results

Fig.6 Distribution of the average heat transfer coefficient in the axial direction (b = 25°, M = 4 kg/s)

Fig.7 Tube label

Fig.8 Average wall heat transfer coefficient of each tube versus Re (b = 25°)

Fig.9 Streamlines in the fully developed section (b = 25°, M = 4 kg/s)

Fig.10 Average velocity across each tube versus Re (b = 25°)

Fig.11 Velocity vector in typical cross sections (b = 25°, V_s = 0.4 m/s)

Fig.12 Velocity contour in typical cross sections (b = 25°, V_s = 0.4 m/s)

Tab.2 Nomenclatures

1	XCao, W J Du, S H Ji, L Cheng (2012). Influence of overlap size on shell-side performance of heat exchangers with helical baffles. Proceedings of the CSEE, 32(8): 78–84 (in Chinese)
2	CDong, D Li, Y QZheng, G NLi, Y GSuo, Y PChen (2016). An efficient and low resistant circumferential overlap trisection helical baffle heat exchanger with folded baffles. Energy Conversion and Management, 113: 143–152 https://doi.org/10.1016/j.enconman.2016.01.055
3	W JDu, H F Wang, X Cao, LCheng (2013). Heat transfer and fluid flow on shell-and-side of heat exchangers with novel sextant sector helical baffles. CIESC Journal, 64(9): 3123–3129 (in Chinese)
4	M RJafari Nasr, AShafeghat (2008). Fluid flow analysis and extension of rapid design algorithm for helical baffle heat exchangers. Applied Thermal Engineering, 28 (Compendex):1324–1332
5	S HJi (2011). Mechanism analysis and performance study of flow and heat transfer in shell-side of shell-and-tube heat exchanger with helical baffles. Dissertation for the Doctoral Degree. Jinan: Shandong University (in Chinese)
6	DKral, P Stehlik, H J V DPloeg, BMaster (1996). Helical baffles in shell-and-tube heat exchangers, Part I: Experimental verification. Heat Transfer Engineering, 17 (Compendex): 93–101
7	JLutcha, J Nemcansky (1990). Performance improvement of tubular heat exchangers by helical baffles. Chemical Engineering Research & Design, 68(3): 263–270
8	B IMaster, K S Chunangad (2003). Venkateswaran pushpanathan, fouling mitigation using helixchanger heat exchangers. In: Proceedings of 2003 ECI Conference on Heat Exchanger Fouling and Cleaning: Fundamentals and Applications. 43
9	L SPletcher, M J Andrews (1994). Technical/market assessment of heat exchanger technology for users of natural gas. GRI Report GRI-94/0248
10	PStehlik, J Nemcansky, DKral, L WSwanson (1994). Comparison of correction factors for shell-and-tube heat exchangers with segmental or helical baffles. Heat Transfer Engineering, 15(Compendex): 55–65
11	RSteinhagen, H Müller-Steinhagen, KMaani (1993). Problems and costs due to heat exchanger fouling in New Zealand industries. Heat Transfer Engineering, 14(1): 19–30 https://doi.org/10.1080/01457639308939791
12	W QTao (2001). Numerical Heat Transfer. Xi’an: Xi’an Jiaotong University Press (in Chinese)
13	LWang (2001). The experimental study of heat transfer and pressure drop for shell-and-tube heat exchangers with helical bafffles. Dissertation for the Doctoral Degree. Xi‘an: Xi’an Jiaotong University (in Chinese)
14	LWang, L Q Luo, Q W Wang, M Zeng, W QTao (2001). Effect of inserting block plants on pressure drop and heat transfer in shell-snd-tube heat exchangers with helical baffles. Journal of Engineering Thermophysics, 22(s): 173–177
15	S LWang (2002). Hydrodynamic studies on heat exchangers with helical baffles. Heat Transfer Engineering, 23(3): 43–49 https://doi.org/10.1080/014576302753605367
16	JWen, H Yang, S MWang, Y LXue, XTong (2015). Experimental investigation on performance comparison for shell-and-tube heat exchangers with different baffles. International Journal of Heat and Mass Transfer, 84: 990–997 https://doi.org/10.1016/j.ijheatmasstransfer.2014.12.071

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