Activities per year
Recent visualization of n-dodecane delivered from a diesel injector into environments above 60 bar and 900 K performed at Sandia National Laboratories suggested a reduction in surface tension as droplets and ligaments were no longer detectible via back-illuminated microscopy. In the current study, improvements in optical microscopy are implemented to overcome much of the optical distortion present at these harsh conditions, leading to greater measurement resolution. The measurements show that the classical atomization and vaporization processes do shift to one where surface tension forces diminish with increasing pressure and temperature. Key indicators of “miscible mixing” include a deformation of liquid structure under minimal shear from surrounding gas velocities as well as indications that both large-scale turbulent motions and local molecular diffusivity simultaneously drive the mixing be-tween fluids of different densities. A new fundamental finding of this study is that the transition to miscible mixing does not occur instantaneously when the fluid enters the chamber at a given temperature and pressure where miscible mixing is observed. Rather, the large, cool liquid structure that was just injected exhibits surface tension at first, and then, after time surrounded by the hot ambient and other fuel vapor, undergoes a transition to miscible mixing.
|Title of host publication||ILASS Americas|
|Publication status||Published - May 2015|
|Event||ILASS Americas 2015 - Raleigh, United States|
Duration: 1 May 2015 → …
|Conference||ILASS Americas 2015|
|Period||1/05/15 → …|
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- School of Arch, Tech and Eng - Professor of Thermofluids
- Advanced Engineering Centre
- Centre for Regenerative Medicine and Devices
- 1 Visiting an external academic institution
Sandia National Laboratories CA
Cyril Crua (Visiting professor)30 Jun 2014 → …
Activity: Visiting position › Visiting an external academic institution