Search results for "Choke"

Examination of the shock wave regular reflexion phenomenon in a rarefied supersonic plasma flow

2005

The flow properties of a low-pressure weakly ionized supersonic argon plasma jet are examined using Fabry–Perot interferometry and laser induced fluorescence spectroscopy. The flow velocity and equilibrium temperature measured at the torch nozzle exit are in close agreement with computational fluid dynamics calculations. The model also predicts the plasma flow to be in a rarefied regime. Departure from thermal equilibrium is indeed observed behind the nozzle where the parallel temperature differs significantly from the perpendicular temperature. The development of the axial velocity component along the jet center stream line reveals the occurrence of the shock wave regular reflexion phenome…

Closure to “Theoretical End‐Depth‐Discharge Relationship for Free Overfall” by Vito Ferro

2000

New Polylactic Acid Composites Reinforced with Artichoke Fibers

2015

In this work, artichoke fibers were used for the first time to prepare poly(lactic acid) (PLA)-based biocomposites. In particular, two PLA/artichoke composites with the same fiber loading (10% w/w) were prepared by the film-stacking method: the first one (UNID) reinforced with unidirectional long artichoke fibers, the second one (RANDOM) reinforced by randomly-oriented long artichoke fibers. Both composites were mechanically characterized in tensile mode by quasi-static and dynamic mechanical tests. The morphology of the fracture surfaces was analyzed through scanning electron microscopy (SEM). Moreover, a theoretical model, i.e., Hill's method, was used to fit the experimental Young's modu…

An Influence of Fructan Containing Concentrate from Jerusalem Artichoke Tubers on the Development of Probiotic Dairy Starters on Milk and Oat-based S…

2007

Supplementation of milk and oat hydrolysate containing medium with Jerusalem artichoke concentrate (JAC) and subsequent fermentation with probiotic dairy starters resulted in substantial stimulation of probiotics Bifidobacterium lactis and Lactobacillus acidophilus as well as yogurt starter culture Lactobacillus bulgaricus development and acidification rate. The strain-specific responses of the general yogurt cultures, as well as probiotics to the addition of JAC, should be considered to achieve optimal composition of probiotic strains and conformable fermentation conditions. JAC is suggested to be perspective prebiotic additive for fermented synbiotic milks or oat-hydrolysate-based product…

Energia zapomnianego topinamburu

2017

Zainteresowanie znalezieniem alternatywy dla energii z paliw kopalnych zwiększa się i kieruje uwagę na rośliny, które mogą być źródłem biomasy. Szczególnie cenne jest uprawianie roślin bioenergetycznych na glebach o mniejszej przydatności rolniczej, ugorach i terenach rekultywacyjnych. W tym względzie, wśród dużej grupy roślin, wielki potencjał ma słonecznik bulwiasty (Helianthus tuberosus L.). Jest on gatunkiem wszechstronnym, użytecznym jako surowiec w wielu gałęziach przemysłu, tradycyjna żywność dla ludzi i zwyczajowa pasza dla zwierząt. Obecnie, w Polsce bylinom tym nadal nie poświęca się wystarczającej uwagi. W artykule omówiono wybrane zagadnienia związane uprawą słonecznika bulwiast…

Kinetic Monte Carlo Simulations of Flow-Assisted Polymerization

2012

We performed kinetic Monte Carlo simulations on a model of a polymerization process in the presence of a periodic oscillatory flow to explore the role of mixing in polymerization reactors. Application of an oscillatory flow field helps overcome the diffusive limitations that develop during a polymerization process due to an increase in the molecular weights of polymer chains, thereby giving rise to high rates of polymerization. A systematic increase in the flow strength results in a "dynamic" coil-stretch transition, leading to an elongation of polymer chains. Reactive ends of stretched (polymer) chains react more frequently than the reactive ends of coiled chains, which are screened by oth…

Carbohydrates in Jerusalem artichoke powder suspension

2007

Purpose – The aim of this study was to evaluate the influence of temperature and action time on the extraction rate of carbohydrates of Jerusalem artichoke concentrate powder and inactivation of inulin during boiling and sterilization.Design/methodology/approach – Water suspension of Jerusalem artichoke concentrate (5g/100ml) at 25, 50 and 100○C was tested after 5, 15, 30 and 60min to determine the content of inulin, glucose, fructose and sucrose and evaluate the extraction rate. The stability of inulin was studied after boiling and sterilization at 120○C during 1, 2 and 3h. The extraction rate was evaluated by Fourier‐Transform Infrared (FT‐IR) spectroscopy as well.Findings – It was shown …

DETERMINATION OF POLYPHENOL OXIDASE AND STUDIES ON BROWNING INACTIVATION IN THREE ARTICHOKE CULTIVARS.

2006

Optimization of Spray-Drying Process of

2019

Jerusalem artichoke is an important natural matrix for inulin production. In this experiment, response surface methodology (RSM) was employed to optimize the spray-drying parameters in order to determine the maximal inulin yield. For this study, three independent variables (heating temperature (Tª, 110–120 °C), creep speed (V, 18–22 rpm) and pressure (P, 0.02–0.04 MPa)) were used in the experimental design. Using the Box–Behnken design, the optimal parameters obtained were: drying temperature 114.6 °C, creep speed 20.02 rpm, and pressure: 0.03 MPa. The inulin yield, water content and particle size of inulin obtained by spray-drying and freeze-drying were compared. In this regard, the spray-…