Double diffusion convection under sinusoidal modulations of low frequency vibrations
- Paper number
IAC-06-A2.2.02
- Author
Dr. Yu Yan, Ryerson University, Canada
- Coauthor
Prof. Ziad Saghir, Ryerson University, Canada
- Year
2006
- Abstract
Double diffusion convection features the coupling of diffusion fluxes driven by the temperature and concentration gradients and the simultaneous existence of the natural convection driven by the buoyancy force. It is of paramount importance in many engineering and scientific problems, such as the compositional variation in hydrocarbon reservoirs, hydrodynamic instability of mixtures, mineral migrations and mass transport in living matters. Theoretically, on free flying platforms, the gravity force, thus the convection can be maximally eliminated; therefore it is possible to achieve high accuracy for the diffusion-dominated experiments carried out in space laboratories. However, in reality, there exist unavoidable static and oscillatory residual vibrations (g-jitters) in almost all space laboratories. They induce the vibrational convection and affect the accuracy of the diffusion experiments. G-jitters have a wide spectrum of amplitudes and frequencies. Their effect on diffusion varies depending on both amplitude and frequency. Study of the effect of different g-jitter modulations on diffusion therefore becomes essential in supporting space experiments. In this paper we have investigated the solutal-thermal diffusion under different vibration modulations with respect to the amplitude and frequency. The main objective is to evaluate the g-jitter effect on thermal diffusion with a particular focus on low frequency g-jitters. Two scenarios – low frequency low amplitude, and low frequency high amplitude – have been studied for a binary mixture of water-isopropanol (90:10 wt
- Abstract document
- Manuscript document
IAC-06-A2.2.02.pdf (🔒 authorized access only).
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