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Research Papers

Performance Study of Continuous Helical Baffle Shell and Tube Heat Exchanger With Central Low-Pressure Regions

[+] Author and Article Information
Partha Pratim Saikia

Department of Mechanical Engineering,
NIT, Agartala,
Agartala 799046, India
e-mail: parthapratimsaikia125@gmail.com

Abhik Majumder

Department of Mechanical Engineering,
NIT, Agartala,
Agartala 799046, India
e-mail: onlyabhik@gmail.com

1Corresponding author.

Contributed by the Heat Transfer Division of ASME for publication in the JOURNAL OF THERMAL SCIENCE AND ENGINEERING APPLICATIONS. Manuscript received August 5, 2015; final manuscript received February 15, 2016; published online April 5, 2016. Assoc. Editor: Amir Jokar.

J. Thermal Sci. Eng. Appl 8(3), 031002 (Apr 05, 2016) (8 pages) Paper No: TSEA-15-1209; doi: 10.1115/1.4033008 History: Received August 05, 2015; Revised February 15, 2016

Shell and tube heat exchanger (STHX) is a class of indirect contact heat exchangers which has wide applications in various industries. In this paper, the shell-side performance characteristics of a small STHX with differently notched continuous helical baffle (CHB) geometries are numerically studied and compared with same CHB without notched regions. The indentations are uniquely produced by placing the notch near the core of the heat exchanger, thereby conferring the flow with low-pressure drop regions. Two set of models of inner notched continuous helical baffle (ICHB), i.e., ICHB1 and ICHB2, are studied with notch width of about 5% and 10% of the inner shell diameter of the same heat exchanger. In comparison with the CHBSTHX, it is seen that the STHXs incorporated with ICHBs, the heat transfer rate dropped slightly, but a significant decrease in pressure drop is observed. It is found that the heat transfer coefficient to pressure drop ratio for ICBH1 and ICHB2 shows significant increase in comprehensive performance of about 3.5% and 32.42%, respectively, when compared with same CHB without notched regions.

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Figures

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Fig. 1

Schematics of (a) ICHB1 and (b) ICHB2 showing one helical baffle

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Fig. 2

Geometrical parameters of CHB-STHX

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Fig. 3

Isometric view of STHX with ICHB2

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Fig. 4

Meshes of the computational domains

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Fig. 5

Results of different grid systems for CHB-STHX at 0.25 kg/s mass flow rate

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Fig. 7

Velocity vectors of the STHXs at 0.5 kg/s. (a) Velocity vector of CHB at 0.5 kg/s, (b) velocity vector of ICHB1 at 0.5 kg/s, and (c) velocity vector of ICHB2 at 0.5 kg/s.

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Fig. 8

Variation of pressure drop with Reynolds number

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Fig. 9

Temperature contours of the STHXs at 0.5 kg/s. (a) Temperature contour of CHB at 0.5 kg/s, (b) temperature contour of ICHB1 at 0.5 kg/s, and (c) temperature contour of ICHB2 at 0.5 kg/s.

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Fig. 10

Variation of heat transfer coefficient with mass flow rate

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Fig. 11

Variation of Nusselt number with mass flow rate

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Fig. 12

Maximal velocity ratios versus Nusselt number

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Fig. 13

Shell-side heat transfer coefficient per unit pressure drop versus mass flow rate

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Fig. 14

Shell-side heat transfer rate per unit pressure drop versus mass flow rate

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