A conservation law for the total surfactant mass is derived, and a re-scaling procedure for the surfactant concentrations is proposed to compensate for the surfactant mass loss due to numerical diffusion.
One possibility is that the chemical peculiarity may be the result of diffusion or mass loss, although stellar models show that this would normally only occur near the end of a star's hydrogen-burning lifespan.
In this work, experimental measurements of flame heat flux and sample mass loss rate are obtained as a diffusion flame spreads vertically upward (in the direction opposed to the vector of gravity) over the surface of seven commonly used polymeric materials, two of which are glass reinforced composites.
The 222Rn concentration during a tidal period was measured continuously and a mass balance model that included atmospheric loss, tidal effects, mixing loss, diffusion from sediments, and SGD was established.
where D is the diffusion coefficient measured in [cm2 · min−1], t is the time of measured mass loss, and L is the sample thickness.
The model can follow mass loss and drug release up to 100%, which cannot be explained using a simple reaction-diffusion.
Heterogeneous surface reactions produce radial convection and diffusion from the particle, which couples with the ambient convection to affect the rate of particle mass loss.
The water diffusion rate and hydrolytic behavior were studied by means of water absorption test, morphology observation, monitor of mass loss, pH measurement, thermal analysis and molecular weight determination.
Wouters, B. et al. Glacier mass loss.
This broad applicability is afforded by fundamental diffusion/reaction equations that can describe a wide variety of scenarios including hydration of and mass loss from a hydrolysable polymer matrix.
