An Isothermal Finite Difference Model for Droplet Spread in the Spraying of Hot Die Surfaces With Water-Based Graphite Lubricants  

Oleh:

Yang, L. ; Shivpuri, R.

Jenis: Article from Journal - ilmiah internasional
Dalam koleksi: Journal of Manufacturing Science and Engineering vol. 129 no. 5 (Oct. 2007), page 874-884.
Topik: Lubrication; Droplet Impact; Finite Difference; Isothermal

Ketersediaan

Perpustakaan Pusat (Semanggi) Nomor Panggil: JJ93.10 Non-tandon: 1 (dapat dipinjam: 0) Tandon: tidak ada

Lihat Detail Induk

Isi artikel

Dilute sprays are used in hot die processing to lubricante and cool the die surface prior to forming of part. These sprays are often stochastic in nature with fine droplets that are randomly deposited at high velocities. Consequently, the spraying mechanism is difficult to measure and to model. This paper presents a simple isothermal deterministic model for the spreading of droplets on hot die surfaces. This model is based on the volume of fluid (VOF) finite difference approach. The lubricants properties for this model are inverse calculated from simple experiments using various lubricants dilution ratios. Using similiarity principles, the model is validated by comparing it with results from single droplets experiments with different droplet diameters and deposition speeds. It is found that for dilute suspensions the isothermal assumption is valid for surface temperatures, where no-stream forms and that a simple linear relationship exits in the logarithmic scale between the spread factor and the droplet Weber number. [DOI: 10.1115/1.2752525]

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