Simulation of gas-substrate heat exchange during cold-gas dynamic spraying

作者：Ryabinin A N; Irissou E; McDonald A^*; Legoux J G

来源：International Journal of Thermal Sciences, 2012, 56: 12-18.

DOI：10.1016/j.ijthermalsci.2012.01.007

• Biot number
• Cold spraying
• Jet impingement
• Nusselt number
• Temperature distribution

In this study, the Nusselt numbers of impinging compressible fluid jets originating from a cold-gas dynamic spraying nozzle were determined. A low-pressure cold-gas dynamic spraying unit was used to generate a jet of hot compressed nitrogen that impinged upon flat substrates. Computer codes based on a finite differences method were used to solve the governing 3-D temperature distribution equation for the substrate to produce a non-dimensional relationship between the Nusselt number and the radius of the impinging fluid jet. It was found that the Nusselt number decreased as the non-dimensional radius of the jet from the stagnation point increased. It was found further that for small values of the Biot number, a simplified 2-D approximation of the substrate temperature distribution produced substrate surface temperature profiles that were in close agreement with that determined from the more complex 3-D temperature distribution model.

• 出版日期2012-6