Research Papers: Fluid-Structure Interaction

Study of Heat Transfer and Fluid Flow in Heat Exchanger and Improve Their Energy Efficiency

[+] Author and Article Information
Nasir Koosha

Department of Energy Engineering,
Islamic Azad University,
South Tehran Branch,
Tehran, Iran

Contributed by the Pressure Vessel and Piping Division of ASME for publication in the JOURNAL OF PRESSURE VESSEL TECHNOLOGY. Manuscript received August 20, 2015; final manuscript received January 7, 2016; published online February 25, 2016. Assoc. Editor: Osamu Watanabe.

J. Pressure Vessel Technol 138(3), 031305 (Feb 25, 2016) (7 pages) Paper No: PVT-15-1192; doi: 10.1115/1.4032705 History: Received August 20, 2015; Revised January 07, 2016

In this study, two rows of fins from a fin-tube plate recuperator heat exchanger with two different materials, ceramic and steel, have been simulated by cfx software. First, by using experimental data that are in access, the independency from network and the confirmation of pattern authenticity have been checked. Equations from the equations of steady-state (SST) model k–ω have been used for applying turbulence terms in dominant. After network stabilization in greatest Reynolds number, the flow in the recuperator heat exchanger has been studied for two other Reynolds numbers. From the simulations, it is concluded that by increasing Reynolds number the temperature of fins' surfaces, outlet fluid temperature, and the temperature of tubes' surfaces will be increased, but totally the amount of overall heat transfer in time unit will be increased by the increase in Reynolds number. Also, it is observed that changing the material from steel to ceramic does not have that much difference for heat transfer in flow in low temperatures but the temperature of fins' surfaces for different materials and similar boundary status is different.

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Fig. 1

Industrial model thermal convertor associated with a view of the arrangement of tube of recuperator heat exchanger

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Fig. 2

This section that contains two tubes of the heat exchanger is the recuperators heat exchanger. Two hot liquids flow in pipes which transfer heat to the cold gas flow duct, which gives.

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Fig. 3

Range of solution includes boundary conditions and developed volume

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Fig. 4

In the below figure fluid area, meshing is indicated from front view and in the above figure the magnified images from two parts determined by red rectangular have been indicated, number of elements 120,600 and the number of knots are 132,512

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Fig. 5

In the below figure meshing of fluid area from top view and in the above figure the magnified figure from determined part with red rectangle, related to tube part have been indicated

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Fig. 6

View of the side of the fluid networking

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Fig. 7

Surface temperature contour from front view, Re = 6200

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Fig. 8

Contour of fluid temperature in outlet of side view (left figure), temperature contour of bottom tube surface from top view (right figure), Re = 6200. This figure shows three views on the map is under investigation in recuperator heat exchanger.

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Fig. 9

Temperature diagram in different levels, Re = 6200

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Fig. 10

Speed diagram in different levels, Re = 6200

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Fig. 11

Temperature diagrams in different levels for two Reynolds numbers of 6200 and 2900

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Fig. 12

Velocity diagrams at different levels for two Reynolds numbers of 6200 and 2900

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Fig. 13

The plane flow lines speed values in 6200 and 2900 Reynolds numbers

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Fig. 14

Fluid temperature contour between two blades in different Reynolds numbers

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Fig. 15

Fluid velocity contour between two blades in different Reynolds numbers

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Fig. 16

Blade surface temperature contour in various Reynolds numbers



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