Splat-quench solidification: estimating the maximum spreading of a droplet impacting a solid surface
Tóm tắt
This study investigates the mechanisms that contribute to determining the maximum spreading of a liquid droplet impacting a solid surface in connection with splat-quench solidification. This paper defines two domains, the viscous dissipation domain and the surface tension domain, which are characterized by the Weber and the Reynolds numbers, and that are discriminated by the principal mechanism responsible for arresting the splat spreading. This paper illustrates the importance of correctly determining the equilibrium contact angle (a surface tension characteristic that quantifies the wetting of the substrate) for predicting the maximum spreading of the splat. Conditions under which solidification of the splat would or would not be expected to contribute to terminating the spreading of the splat are considered. However, our a priori assumption is that the effect of solidification on the spreading of a droplet, superheated at impact, is secondary compared to the effects of viscous dissipation and surface tension.
Tài liệu tham khảo
H. Jones, Rep. Prog. Phys. 36, (1973) 1425.
B. H. Kear, B. C. Giessen and M. Cohen, in “Rapidly Solidified Amorphous and Crystalline Alloys”, Materials Research Society Symposia Proceedings, Vol. 8 (North-Holland, New York, 1981).
B. H. Kear and B. C. Giessen, in “Rapidly Solidified Metastable Materials”, Materials Research Society Symposia Proceedings, Vol. 28 (North-Holland, New York, 1984).
M. Tenhover, W. L. Johnson and L. E. Tanner, in “Science and Technology of Rapidly Quenched Alloys”, Materials Research Society Symposia Proceedings, Vol. 80 (Materials Research Society, Pittsburgh, Pennsylvania, 1987).
P. G. Boswell, Metals Forum 2 (1979) 40.
R. C. Ruhl, Mater. Sci. Engng 1 (1967) 313.
J. Madejski, Int. J. Heat Mass Transfer 19 (1976) 1009.
Idem, ibid. 26 (1983) 1095.
R. McPherson, J. Mater. Sci. 15 (1980) 3141.
H. Jones, J. Phys. D: Appl. Phys. 4 (1971) 1657.
E. W. Collings, A. J. Markworth, J. K. McCoy and J. H. Saunders, J. Mater. Sci. 25 (1990) 3677.
S. Chandra and C. T. Avedisian, in Fall Technical Meeting of the Eastern States Section of the Combustion Institute, Orlando, Florida, December 1990, Paper No. 83.
G. J. Dienes and H. F. Klemm, J. Appl. Phys. 17 (1946) 458.
A. W. Adamson, “Physical Chemistry of Surfaces”, 4th Edn (Wiley, New York, 1982) pp. 338–340.
S. H. Davis, Trans. ASME: J. Appl. Mech. 50 (1983) 977.
P. G. de Gennes, Rev. Mod. Phys. 57 (1985) 827.