{"title":"Roughness Effects on Nucleate Pool Boiling of R-113 on Horizontal Circular Copper Surfaces","authors":"R. Hosseini, A. Gholaminejad, H. Jahandar","volume":55,"journal":"International Journal of Aerospace and Mechanical Engineering","pagesStart":1421,"pagesEnd":1427,"ISSN":"1307-6892","URL":"https:\/\/publications.waset.org\/pdf\/11858","abstract":"The present paper is an experimental investigation of\r\nroughness effects on nucleate pool boiling of refrigerant R113 on\r\nhorizontal circular copper surfaces. The copper samples were treated\r\nby different sand paper grit sizes to achieve different surface\r\nroughness. The average surface roughness of the four samples was\r\n0.901, 0.735, 0.65, and 0.09, respectively. The experiments were\r\nperformed in the heat flux range of 8 to 200kW\/m2. The heat transfer\r\ncoefficient was calculated by measuring wall superheat of the\r\nsamples and the input heat flux. The results show significant\r\nimprovement of heat transfer coefficient as the surface roughness is\r\nincreased. It is found that the heat transfer coefficient of the sample\r\nwith Ra=0.901 is 3.4, 10.5, and 38.5% higher in comparison with\r\nsurfaces with Ra of 0.735, 0.65, and 0.09 at heat flux of 170 kW\/m2.\r\nMoreover, the results are compared with literature data and the well\r\nknown Cooper correlation.","references":"[1] G. Ribatski, and J. M. S. Jabardo, \"Experimental Study of Nucleate\r\nBoiling of Halocarbon Refrigerants on Cylindrical Surfaces,\" Int. J. Heat\r\nMass Transfer vol. 46, pp. 4439-4451, 2003.\r\n[2] V. K. Dhir, \"Nucleate and Transition Boiling Heat Transfer under Pool\r\nand External Flow Conditions,\" Int. J.Heat Fluid Flow, vol. 12, pp. 290-\r\n314, 1991.\r\n[3] I. L. Pioro, W. Rohsenow, and S. S. Doerffer, \"Nucleate Pool-Boiling\r\nHeat Transfer. I: Review of Parametric Effects of Boiling Surface,\" Int.\r\nJ. 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