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The design of optimum air-heating vaporizer is needed to compensate for the low heat capacity of air as its heat source. In this study, numerical analysis of air heating vaporizer is conducted. A longitudinally-finned vertical-pipe was used as CFD model to represent the air-heating vaporizer. Cryogenic nitrogen was used as the working fluid and the ambient air was assumed to contain no water vapor. The convective heat transfer coefficient inside the pipe (hi) which is derived from CFD analysis has a good agreement with the convective heat transfer coefficient derived from Perkins' Nusselt correlation. Then, the convective heat transfer coefficient outside the pipe (h<SUB>o</SUB>) was calculated and then it was continued to find the relation between the Rayleigh (Ra) number and Nusselt number outside the pipe, Nu<SUB>o</SUB>. The results show that the Ra number and Nu<SUB>o</SUB> number have proportional trend in the range of Raleigh number of 1.3674×10¹³≤Ra≤2.8343≤10¹³ and then the Nusselt number correlation outside the pipe, Nu<SUB>o</SUB>, was proposed.

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Abstract
1. Introduction
2. Numerical Simulation
3. Calculation and Validation
4. Result and Discussion
5. Conclusions
Acknowledgement
References

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UCI(KEPA) : I410-ECN-0101-2009-550-014966254