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Numerical investigation of laminar forced convection of water upwards in a narrow annulus at supercritical pressure

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  • Hassan Zaim, E.
  • Gandjalikhan Nassab, S.A.

Abstract

In the present work, convection heat transfer of water at supercritical pressure in a narrow annulus at low Reynolds numbers (less than 1500) has been investigated numerically. The continuity, momentum and energy equations have been solved simultaneously using computational fluid dynamics techniques with the inlet Reynolds number ranging from 250 to 1000, Grashof number from 2.5 × 105 to 1 × 106 and the inlet fluid temperature from 360 °C to 380 °C. In all of the case studies, a sub-cooled water flow at supercritical pressure (25 MPa) and a temperature close to the pseudo-critical point enters the annular channel with constant heat flux at inner wall surface and insulated at outer wall. To calculate the velocity and temperature distributions of the flow, discretized form of the governing equations in the cylindrical coordinate system are obtained by the finite volume method and solved by the SIMPLE algorithm. It has been shown that the effect of buoyancy is strong and causes extensive increase in velocity near the inner wall, and consequently an increase in the convective heat transfer, which is desirable. Besides, the effects of inlet Reynolds number, Grashof number and inlet temperature on the velocity distribution and also on the heat transfer have been investigated.

Suggested Citation

  • Hassan Zaim, E. & Gandjalikhan Nassab, S.A., 2010. "Numerical investigation of laminar forced convection of water upwards in a narrow annulus at supercritical pressure," Energy, Elsevier, vol. 35(10), pages 4172-4177.
    • Handle: RePEc:eee:energy:v:35:y:2010:i:10:p:4172-4177
    DOI: 10.1016/j.energy.2010.06.040
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    References listed on IDEAS

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    1. Schuster, A. & Karellas, S. & Aumann, R., 2010. "Efficiency optimization potential in supercritical Organic Rankine Cycles," Energy, Elsevier, vol. 35(2), pages 1033-1039.
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    Cited by:

    1. Liu, Di & Zhao, Fu-Yun & Wang, Han-Qing, 2011. "Passive heat and moisture removal from a natural vented enclosure with a massive wall," Energy, Elsevier, vol. 36(5), pages 2867-2882.
    2. Knez, Ž. & Markočič, E. & Leitgeb, M. & Primožič, M. & Knez Hrnčič, M. & Škerget, M., 2014. "Industrial applications of supercritical fluids: A review," Energy, Elsevier, vol. 77(C), pages 235-243.
    3. Zhu, Hongjun & Lin, Pengzhi & Pan, Qian, 2014. "A CFD (computational fluid dynamic) simulation for oil leakage from damaged submarine pipeline," Energy, Elsevier, vol. 64(C), pages 887-899.

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