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Title of article :
An experimental study of high Weber number impact of methoxy-nonafluorobutane C4F9OCH3 (HFE-7100) and n-heptane droplets on a heated solid surface
Author/Authors :
Samuel L. Manzello، نويسنده , , Jiann C Yang، نويسنده ,
Issue Information :
روزنامه با شماره پیاپی سال 2002
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Abstract :
An experimental study is presented for methoxy-nonafluorobutane (C4F9OCH3, HFE-7100) droplet impingement on a heated stainless steel surface. The impaction process was recorded using a high-speed digital camera at 1000 frames per second. The initial droplet diameter was fixed at 1.7±0.1 mm, and all experiments were performed in atmospheric air. The impact velocity was fixed at 2.0 m/s thus defining an impact Weber number of 750. The temperature of the stainless steel surface was varied from 20 to 300 °C, above the Leidenfrost temperature of HFE-7100. Experiments were also performed using n-heptane to investigate whether the collision dynamics were similar if the impact Weber number was matched to HFE-7100 and collision considered within the same boiling regimes as HFE-7100. While the collision dynamics were qualitatively similar, the evolution of liquid film diameter with time was different. Existing models used to describe the evolution of liquid film diameter with time were found to be inadequate to describe HFE-7100 and n-heptane impact.
Keywords :
Droplet , Impact , Heated surface
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