Syneresis centrifugal

For natural boundary conditions, as a rule, one must use numerical methods or approximate analysis. For example, a numerical solution describing the wave of capillary suction was obtained in [152], and a solution describing centrifugal syneresis was obtained in [490] by using expansions with respect to a small parameter. 

In the one phase region, when the sample was seen to flow easily, it was said that the system was still a sol. When the meniscus was seen not to deform under it own weight, the system was considered a gel. The sol-gel transition was taken at the onset of meniscus deformation when the tube is held horizontal. Syneresis and precipitation were detected by the presence of water at the gel surface or by the existence of large turbid aggregates which could be centrifugated. 

Alternatively to collecting sediment, liquid may be collected and measured in a conical graduated centrifuge tube from a freshly cut surface of a 200-g sample of jam or jelly the sample is divided into quadrants on a nylon net. A maximum of 0.5 mL in 2 h is arbitrarily set as an index of good product quality, i.e., a low syneresis tendency (Hercules, Inc., 1985). 

Harwalkar, V. R., and Kalab, M. (1983). Susceptibility of yoghurt to syneresis. Comparison of centrifugation and drainage methods. Milchwissenschaft 38, 517-522. 

---