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A correlation to predict heat-transfer rates of a miniature loop thermosyphon

Abstract

This research is aimed at enhancing the traditional thermosyphon by preventing flooding and drying out from the opposite directions of the vapor and liquid. A miniature loop thermosyphon (MLT) consists of three sections, namely, the evaporator, the adiabatic and condenser sections. The return liquid channel is connected between the condenser and the evaporator to convey the condensed liquid. The MLT has a ratio of internal diameter of the condenser section to internal diameter of the evaporator section (Idc/Ide), which is 1.4. The MLT was made from a copper tube of 15-mm, 19-mm, and 22-mm ID. The filling ratios of the working fluid were 30%, 50%, and 80% of evaporator volume with an inclination angle of 90°. The operating temperatures were 70°C, 80°C, and 90°C with ratios of Ide/Idr of 3, 3.8, and 4.4. The research reports the effect of dimensionless parameters on heat-transfer characteristics, namely, Bo, Pr, We, Fr, Ja, Ku, ρ υ /ρ l, and Ide/Idr. It was found that the Bo, Pr, Ja, Ku, ρ υ /ρ l, and Ide/Idr have no effect on heattransfer characteristics. The We, Fr, and Ku have an effect on the heat-transfer characteristics as with increasing We, Fr, and Ku, the heat-transfer characteristics decrease. The research established another modified Kutateladze number, which can also be used to predict MLT in the vertical position.

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References

  1. 1.

    David, R. and Peter, K., Heat Pipes Theory, Design and Application, 5th ed., Butterworth-Heinemann, 2006, pp. 165–166.

    Google Scholar 

  2. 2.

    Hewitt, G.F., Shires, G.L., and Bott, T.R., Process Heat Transfer, USA: CRC Press, 1994, pp. 391–394, 429–431.

    Google Scholar 

  3. 3.

    Kaminaga, F., Feroz, M.C., Watanabe, H., and Matsumura, K., Heat Transfer Characteristics in a Looped Parallel Thermosyphon, 7th Int. Heat Symposium, Jeju, Korea, 2003, pp. 12–16.

    Google Scholar 

  4. 4.

    Khodabandeh, R., Pressure Drop in Riser and Evaporator in an Advanced Two-Phase Thermosyphon Loop, Int. J. Refriger., 2005, vol. 28, no. 45, pp. 725–734.

    Article  Google Scholar 

  5. 5.

    Terdtoon, P. and Chailungkar, M., Effects of Aspect Rations on Internal Flow Patterns of an Inclined Closed Two-Phase Thermosyphon at Normal Operating Condition, Heat Transfer Eng., 1989, vol. 19, no. 4, pp. 75–85.

    ADS  Article  Google Scholar 

  6. 6.

    Shiraishi, M., Influences of Evaporator Geometry on Performance Limit in Two-Phase Closed Thermosyphons, Proc. 6th Int. Heat Pipe Conf., France, 1987.

    Google Scholar 

  7. 7.

    Tharawadee, N., Sakulchangsatjatai, P., and Terdtoon, P., Effect of Diameter Ratio on Heat Transfer Characteristic of Non-Uniform Diameter Closed Loop Oscillation Heat Pipe, Heatpipe Science and Technology, Proc. 9th Int. Heat Pipe Symposium, 2008, pp. 148–153.

    Google Scholar 

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Correspondence to S. Rittidech.

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Dangeton, W., Rittidech, S., Pattiya, A. et al. A correlation to predict heat-transfer rates of a miniature loop thermosyphon. J. Engin. Thermophys. 22, 111–121 (2013). https://doi.org/10.1134/S1810232813020033

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Keywords

  • Heat Pipe
  • Froude Number
  • Engineer THERMOPHYSICS
  • Condenser Section
  • Engineering THERMOPHYSICS