Modeling and Simulation of a Freeze Concentration Technique for Sugarcane Juice Concentration

Freeze concentration is a process in which water is selectively separated out of binary solution in the form of ice, thereby concentrating solution. The freeze concentration system under consideration is a heat pump based freeze concentration system (FCS) that uses layer freezing process. The application of this system for the present paper is in the process of jaggery making used to concentrate sugarcane juice. A mathematical model is developed that helps in simulation of system under various operating parameters. The model is validated using previously published experimental results. Finally, based on simulation effects of various system parameters on ice growth and subsequent juice concentration have been discussed.

Effects of Process Parameters on Physical and Biological Properties of a Small Caliber Vascular Prosthesis

ABSTRACTA method is described for the production of collagen constructs formed from densely packed, native-banded collagen fibrils. This “Dense Fibrillar Collagen” is formed by concentrating collagen in situ prior to self assembly of the collagen into fibrils. The effect of altering the pH, ionic strength, and osmolarity of the concentrating solution was measured. Increasing the ionic strength and osmolarity of the concentrating solution increased the burst strength of the constructs; increasing the pH from 3.8 to 7.1 reduced the surface fibrillarity, degree of platelet uptake and “short term in vivo thrombogenicity. This construct is being considered as the basis of a small-caliber vascular prosthesis to support guided tissue regeneration.