Experimental Study of Subcooled Pool Boiling around a Circular Rough Cylinder

Document Type : Research Article

Authors

School of Mechanical Engineering, Shiraz University, Shiraz, Iran

Abstract

Subcooling degree and surface roughness are two major parameters that have a considerable effect on boiling heat transfer. In the present study, the effects of subcooling degree on pool boiling heat transfer coefficient and surface temperature distribution are investigated experimentally. Tests are conducted for saturated and subcooled water with different subcooling degrees in the local atmospheric pressure (863 mbar) around a horizontal stainless steel cylinder with specific surface roughness. The test section is a pool with dimensions of 120×400×550 mm and test case is a circular cylinder with 80 mm length, 9 mm diameter and 0.794 μm average surface roughness. In this research, experiments are performed for the degrees of subcooling between 5.5°C to 45.5°C and for the heat fluxes between 0.31 kW/m32 to 125.62 kW/m. Results show that by increasing the degree of subcooling for a specific average surface roughness, average surface temperature is decreased and due to changes in the mechanism of heat transfer from nucleate boiling to natural convection, heat transfer coefficient is also decreased. In the region of natural convection, the variation of heat transfer coefficient with heat flux is low and when boiling process begins, this variation is more considerable. Furthermore, for lower heat fluxes (less than 5 kW/m), the temperature difference between upper and lower sides of the test case is less than 1°C which  increases for higher heat fluxes so that for more than 100 kW/m2,it reaches to 6°C.

Highlights

[1] A. Faghri, Y. Zhang, Transport phenomena in multiphase systems, Academic Press, 2006.

[2] S.G. Kandlikar, Handbook of phase change: boiling and condensation, CRC Press, 1999.

[3] T.L. Bergman, A.S. Lavine, F.P. Incropera, D.P. DeWitt, Fundamentals of heat and mass transfer, 7th ed., John Wiley & Sons, 2011.

[4] S.W. Churchill, H.H. Chu, Correlating equations for laminar and turbulent free convection from a vertical plate, International journal of heat and mass transfer, 18(11) (1975) 1323-1329.

[5] W.M. Rohsenow, A method of correlating heat transfer data for surface boiling of liquids, Cambridge, Mass.: MIT Division of Industrial Cooporation, 1951.

[6] J. Buongiorno, L.-W. Hu, S.J. Kim, R. Hannink, B. Truong, E. Forrest, Nanofluids for enhanced economics and safety of nuclear reactors: an evaluation of the potential features, issues, and research gaps, Nuclear Technology, 162(1) (2008) 80-91.

[7] L. Lee, B. Singh, The influence of subcooling on nucleate pool boiling heat transfer, Letters in Heat and Mass Transfer, 2(4) (1975) 315-323.

[8] M.-G. Kang, Effect of surface roughness on pool boiling heat transfer, International journal of heat and mass transfer, 43(22) (2000) 4073-4085.

[9] I. Pioro, W. Rohsenow, S. Doerffer, Nucleate pool-boiling heat transfer. I: review of parametric effects of boiling surface, International Journal of Heat and Mass Transfer, 47(23) (2004) 5033-5044.

[10] I. Pioro, W. Rohsenow, S. Doerffer, Nucleate pool-boiling heat transfer. II: assessment of prediction methods, International Journal of Heat and Mass Transfer, 47(23) (2004) 5045-5057.

[11] I. Pioro, Boiling heat transfer characteristics of thin liquid layers in a horizontally flat two-phase thermosyphon, in: Preprints of the 10th International Heat Pipe Conference, Stuttgart, Germany, 1997, pp. 1-5.

[12] M.-G. Kang, Effects of pool subcooling on boiling heat transfer in a vertical annulus with closed bottom, International journal of heat and mass transfer, 48(2) (2005) 255-263.

[13] Kang, M.-G., 2006. “Effects of Water Subcooling onHeat Transfer in Vertical Annuli”. International Journal of Heat and Mass Transfer, 49(23), pp. 4372- 4385.

[14] G. Su, Y. Wu, K. Sugiyama, Subcooled pool boiling of water on a downward-facing stainless steel disk in a gap, International Journal of Multiphase Flow, 34(11) (2008) 1058-1066.

[15] A. Coulibaly, X. Lin, J. Bi, D.M. Christopher, Bubble coalescence at constant wall temperatures during subcooled nucleate pool boiling, Experimental Thermal and Fluid Science, 44 (2013) 209-218.

[16] Y. Rousselet, G.R. Warrier, V.K. Dhir, Subcooled pool film boiling heat transfer from small horizontal cylinders at near-critical pressures, International Journal of Heat and Mass Transfer, 72 (2014) 531-543.

[17] L. Zhou, L. Wei, X. Du, Y. Yang, P. Jiang, B. Wang, Effects of nanoparticle behaviors and interfacial characteristics on subcooled nucleate pool boiling over microwire, Experimental thermal and fluid science, 57 (2014) 310-316.

[18] L. Dong, X. Quan, P. Cheng, An experimental investigation of enhanced pool boiling heat transfer from surfaces with micro/nano-structures, International Journal of Heat and Mass Transfer, 71 (2014) 189-196.

[19] M. Shojaeian, A. Koşar, Pool boiling and flow boiling on micro-and nanostructured surfaces, Experimental Thermal and Fluid Science, 63 (2015) 45-73.

[20] J.M. Kshirsagar, R. Shrivastava, Review of the influence of nanoparticles on thermal conductivity, nucleate pool boiling and critical heat flux, Heat and Mass Transfer, 51(3) (2015) 381-398.

[21] Y. Cengel, A. Ghajar, Heat and Mass Transfer: Fundamentals and Applications, 5th ed., McGraw-Hill Education, 2014.

[22] A. Gupta, J. Saini, H. Varma, Boiling heat transfer in small horizontal tube bundles at low cross-flow velocities, International journal of heat and mass transfer, 38(4) (1995) 599-605.

[23] S.J. Kline, F. McClintock, Describing uncertainties in single-sample experiments, Mechanical Engineering, 75(1) (1953) 3-8.

Keywords

References

[1] A. Faghri, Y. Zhang, Transport phenomena in multiphase systems, Academic Press, 2006.
[2] S.G. Kandlikar, Handbook of phase change: boiling and condensation, CRC Press, 1999.
[3] T.L. Bergman, A.S. Lavine, F.P. Incropera, D.P. DeWitt, Fundamentals of heat and mass transfer, 7th ed., John Wiley & Sons, 2011.
[4] S.W. Churchill, H.H. Chu, Correlating equations for laminar and turbulent free convection from a vertical plate, International journal of heat and mass transfer, 18(11) (1975) 1323-1329.
[5] W.M. Rohsenow, A method of correlating heat transfer data for surface boiling of liquids, Cambridge, Mass.: MIT Division of Industrial Cooporation, 1951.
[6] J. Buongiorno, L.-W. Hu, S.J. Kim, R. Hannink, B. Truong, E. Forrest, Nanofluids for enhanced economics and safety of nuclear reactors: an evaluation of the potential features, issues, and research gaps, Nuclear Technology, 162(1) (2008) 80-91.
[7] L. Lee, B. Singh, The influence of subcooling on nucleate pool boiling heat transfer, Letters in Heat and Mass Transfer, 2(4) (1975) 315-323.
[8] M.-G. Kang, Effect of surface roughness on pool boiling heat transfer, International journal of heat and mass transfer, 43(22) (2000) 4073-4085.
[9] I. Pioro, W. Rohsenow, S. Doerffer, Nucleate pool-boiling heat transfer. I: review of parametric effects of boiling surface, International Journal of Heat and Mass Transfer, 47(23) (2004) 5033-5044.
[10] I. Pioro, W. Rohsenow, S. Doerffer, Nucleate pool-boiling heat transfer. II: assessment of prediction methods, International Journal of Heat and Mass Transfer, 47(23) (2004) 5045-5057.
[11] I. Pioro, Boiling heat transfer characteristics of thin liquid layers in a horizontally flat two-phase thermosyphon, in: Preprints of the 10th International Heat Pipe Conference, Stuttgart, Germany, 1997, pp. 1-5.
[12] M.-G. Kang, Effects of pool subcooling on boiling heat transfer in a vertical annulus with closed bottom, International journal of heat and mass transfer, 48(2) (2005) 255-263.
[13] Kang, M.-G., 2006. “Effects of Water Subcooling onHeat Transfer in Vertical Annuli”. International Journal of Heat and Mass Transfer, 49(23), pp. 4372- 4385.
[14] G. Su, Y. Wu, K. Sugiyama, Subcooled pool boiling of water on a downward-facing stainless steel disk in a gap, International Journal of Multiphase Flow, 34(11) (2008) 1058-1066.
[15] A. Coulibaly, X. Lin, J. Bi, D.M. Christopher, Bubble coalescence at constant wall temperatures during subcooled nucleate pool boiling, Experimental Thermal and Fluid Science, 44 (2013) 209-218.
[16] Y. Rousselet, G.R. Warrier, V.K. Dhir, Subcooled pool film boiling heat transfer from small horizontal cylinders at near-critical pressures, International Journal of Heat and Mass Transfer, 72 (2014) 531-543.
[17] L. Zhou, L. Wei, X. Du, Y. Yang, P. Jiang, B. Wang, Effects of nanoparticle behaviors and interfacial characteristics on subcooled nucleate pool boiling over microwire, Experimental thermal and fluid science, 57 (2014) 310-316.
[18] L. Dong, X. Quan, P. Cheng, An experimental investigation of enhanced pool boiling heat transfer from surfaces with micro/nano-structures, International Journal of Heat and Mass Transfer, 71 (2014) 189-196.
[19] M. Shojaeian, A. Koşar, Pool boiling and flow boiling on micro-and nanostructured surfaces, Experimental Thermal and Fluid Science, 63 (2015) 45-73.
[20] J.M. Kshirsagar, R. Shrivastava, Review of the influence of nanoparticles on thermal conductivity, nucleate pool boiling and critical heat flux, Heat and Mass Transfer, 51(3) (2015) 381-398.
[21] Y. Cengel, A. Ghajar, Heat and Mass Transfer: Fundamentals and Applications, 5th ed., McGraw-Hill Education, 2014.
[22] A. Gupta, J. Saini, H. Varma, Boiling heat transfer in small horizontal tube bundles at low cross-flow velocities, International journal of heat and mass transfer, 38(4) (1995) 599-605.
[23] S.J. Kline, F. McClintock, Describing uncertainties in single-sample experiments, Mechanical Engineering, 75(1) (1953) 3-8.
AUT Journal of Mechanical Engineering
Volume 1, Issue 1
June 2017
Pages 21-28

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