Wyniki wyszukiwania - BazTech

Ograniczanie wyników

Znaleziono wyników: 2

Liczba wyników na stronie

Wyniki wyszukiwania

Sortuj według:

Ogranicz wyniki do:

Green solution for cotton scouring

Stanescu M. D., Dochia M., Radu D., Sirghie C.

Fibres & Textiles in Eastern Europe

2010

Vol. 18, no. 3 (80)

109--111

The classical procedure for cotton scouring generates pollution due to the chemical reagents used for pectin destruction. Up to now a number of solutions using enzymes as catalysts for pectin degradation have been proposed. The use of chemicals like ethylene diamine tetra acetate (EDTA), which are known as toxic, makes processes of bio-scouring unecological. We studied the possibility of replacing EDTA with a biodegradable compound, namely sodium.

Klasyczny proces prania bawełny powoduje chemiczne zanieczyszczenie środowiska z powodu związków użytych do zmywania pektyn. Jak dotychczas proponowano do zmycia pektyn różnego rodzaju roztwory zawierające enzymy oraz katalizatory. Stosowanie związków takich jak kwas etylenodiaminotetraoctowy znanych jako toksyny powoduje, że proces prania jest nieekologiczny. Badaliśmy możliwość prania z zastosowaniem biodegradowalnego cytrynianu sodu. Badano również zastosowanie ultradźwięków dla polepszenia procesu bio-prania.

Some remarks on the concept of stream tubes for numerical simulations of complex fluid flows - applications

Clermont J., Normandin M., Radu D.

Control and Cybernetics

2000

Vol. 29, no 2

535-553

This paper presents new theoretical elements for numerical simulation of two- and three-dimensional flows, based on the concept of streamlines and domain decomposition. The so-called "stream-tube method", considered previously particularly for flows inolving open streamlines, is extended to general streamline comfigurations. It is shown how local transformation functions may be defined in order to simulate flows of complex fluids, notably those requiring evaluation of particle time history. The specific features (for example : mass conservation, simplicity in handling time-dependent constitutive equations) of the stream-tube methods previously investigated numerically are still preserved in the new formulation. An example of calculations is given in the case of the two-dimensional flow of a Newtonian fluid between two eccentric cylinders where results are found to be consistent with literature data.