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Research Papers

Porous Body Model Based Parametric Study for Sodium to Air Heat Exchanger Used in Fast Reactors

[+] Author and Article Information
S. P. Pathak

Indira Gandhi Centre for Atomic Research,
Kalpakkam 603102, India
e-mail: sppathak@igcar.gov.in

V. A. Suresh Kumar

Indira Gandhi Centre for Atomic Research,
Kalpakkam 603102, India
e-mail: skumar@igcar.gov.in

I. B. Noushad

Indira Gandhi Centre for Atomic Research,
Kalpakkam 603102, India
e-mail: noushad@igcar.gov.in

K. K. Rajan

Indira Gandhi Centre for Atomic Research,
Kalpakkam 603102, India
e-mail: kkrajan@igcar.gov.in

K. Velusamy

Indira Gandhi Centre for Atomic Research,
Kalpakkam 603102, India
e-mail: kvelu@igcar.gov.in

C. Balaji

Indian Institute of Technology Madras,
Chennai 600036, India
e-mail: balaji@iitm.ac.in

Contributed by the Heat Transfer Division of ASME for publication in the JOURNAL OF THERMAL SCIENCE AND ENGINEERING APPLICATIONS. Manuscript received April 29, 2014; final manuscript received January 28, 2015; published online November 11, 2015. Assoc. Editor: Suman Chakraborty.

J. Thermal Sci. Eng. Appl 8(1), 011010 (Nov 11, 2015) (8 pages) Paper No: TSEA-14-1098; doi: 10.1115/1.4030730 History: Received April 29, 2014

Sodium to air heat exchangers (AHX) with finned tubes is used in fast breeder reactors for decay heat removal. The aim of decay heat removal is to maintain the fuel, clad, coolant, and structural temperatures within safety limits. To investigate the thermal hydraulic features of AHX, a robust porous body based computational fluid dynamics (CFD) model has been developed and validated against the experimental data obtained from a model AHX of 2 MW capacity in Steam Generator Test Facility at the Indira Gandhi Centre for Atomic Research, Kalpakkam. In the present paper, the developed porous body model is used to study the sodium and air temperature distribution and the influence of various parameters that affect the heat removal rate and sodium outlet temperature in full-size AHX used in the fast breeder reactors. The parameters include mass flow rates and inlet temperatures of sodium and air. The focus of the study has been to identify conditions that can pose the risk of sodium freezing.

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References

Figures

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Fig. 1

Schematic of PFBR SGDHR system

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Fig. 2

Schematic of the model AHX

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Fig. 3

Computational domain for the porous body model

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Fig. 4

Flow chart depicting the sequence of calculations in the porous body model

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Fig. 5

Numerically predicted mean sodium temperature along the tube length at each pass location at sodium flow rate = 33 kg/s, air flow rate = 31.2 kg/s, and sodium inlet temperature = 494 °C

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Fig. 6

Numerically predicted air temperatures along the tube length at each pass location at sodium flow rate = 33 kg/s, air flow rate = 31.2 kg/s, and sodium inlet temperature = 494 °C

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Fig. 7

Effect of varying sodium flow rate on the power removed by the AHX at air flow rate = 31.2 kg/s and sodium inlet temperature = 494 °C

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Fig. 8

Effect of sodium flow rate on the outlet sodium temperature of the AHX at air flow rate = 31.2 kg/s and sodium inlet temperature = 494 °C

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Fig. 9

Effect of varying sodium flow rate on the outlet air temperature of the AHX at air flow rate = 31.2 kg/s and sodium inlet temperature = 494 °C

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Fig. 10

Effect of variation of AHX sodium inlet temperature on the outlet sodium temperature at air flow rate = 31.2 kg/s and sodium flow rate = 33 kg/s

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Fig. 11

Effect of variation of AHX inlet sodium temperature on the power removed by the AHX at air flow rate = 31.2 kg/s and sodium flow rate = 33 kg/s

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Fig. 12

Effect of air flow rate on the AHX outlet air and sodium temperatures at sodium inlet temperature = 494 °C and sodium flow rate = 33 kg/s

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Fig. 13

Effect of air flow rate on the power removed by AHX at sodium inlet temperature = 494 °C and sodium flow rate = 33 kg/s

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