DOI: 10.5176/2251-1857_M312.37
Authors: Amitesh Kumar, B. K. dhindaw, Sudipto Ghosh, Vinod Kumar
Abstract: Impingement and solidification of a molten metal droplet on a substrate has several engineering applications like thermal spray coating and spray casting. Impingement of a molten metal droplet over a substrate causes formation of a splat after spreading and solidification. Modeling of heat transfer and fluid flow during the impingement and solidification of metal droplets on a substrate is helpful for the better understanding and control of related spray casting and thermal spray coating processes. In the present work, the spreading and solidification phenomenon of an impinging liquid metal droplet over a cold substrate are studied theoretically and validated experimentally. A comprehensive model for heat transfer and solidification during impingement of a falling liquid Al-33wt{6e6090cdd558c53a8bc18225ef4499fead9160abd3419ad4f137e902b483c465}Cu droplet on a 304 stainless steel substrate has been developed on FLUENT 6.3.16 platform. Al-33wt{6e6090cdd558c53a8bc18225ef4499fead9160abd3419ad4f137e902b483c465}Cu was selected so that Jackson – Hunt theory[1] can be utilized for the validation of the impingement model.
The comprehensive model correctly predicted the total spread in the droplet. As per the predicted transient thermal field, the solidification front speed oscillated as one moved radially outward from the center of the spread droplet. Based on the estimated front speeds at these locations and Jackson – Hunt plot for Al-33wt{6e6090cdd558c53a8bc18225ef4499fead9160abd3419ad4f137e902b483c465}Cu the variation of interlamellar spacing along the radial direction was found out. It matched well with the variation of the experimentally measured interlamellar spacing at different locations along the radius.
Keywords: Droplet impingement, solidification, modeling
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