Mathematical maximisation of minimum residence time for two strand continuous caster

2003 ◽  
Vol 30 (3) ◽  
pp. 229-234 ◽  
Author(s):  
D. J. de Kock ◽  
K. J. Craig ◽  
C. A. Pretorius
Keyword(s):  
Residence Time ◽  
Continuous Caster ◽  
Minimum Residence Time

scholarly journals Modelling of optimum cascade of ideal mixing reactors

2017 ◽  
Vol 2 (20) ◽  
pp. 149-160
Author(s):  
German Efremov ◽  
Julia Geller
Keyword(s):  
Dynamic Programming ◽  
Residence Time ◽  
Order Reaction ◽  
Dynamic Programming Method ◽  
Minimum Volume ◽  
Single Application ◽  
First Order ◽  
Ideal Mixing ◽  
Minimum Residence Time ◽  
Method Of Dynamic Programming

It is discussed the using of dynamic programming method to optimize the parameters of the cascade of ideal mixing reactors, which is held isothermal first order reaction. It is found, that the minimum volume of the cascade of reactors corresponds to the minimum residence time of substance in this cascade. The optimum value of residence time for all reactors are equal and all ratio of input and output concentrations are equal, hence, and all volumes of reactors are also equal. A total volume of the cascade of reactors is less than the amount single. Application of the method of dynamic programming is illustrated with an example of the calculation of the polymerization in a cascade of four reactors according to the literature experimental data.

History of the endangered thread-leaved sundew (Drosera filiformis) in southern Nova Scotia

2005 ◽  
Vol 83 (1) ◽  
pp. 14-21 ◽  
Author(s):  
Mark Landry ◽  
Les C Cwynar
Keyword(s):  
Nova Scotia ◽  
Residence Time ◽  
Radiocarbon Dating ◽  
Plant Macrofossil ◽  
Radiocarbon Age ◽  
Macrofossil Analysis ◽  
The Past ◽  
History Of ◽  
Minimum Residence Time ◽  
Plant Macrofossil Analysis

We used the techniques of plant macrofossil analysis and radiocarbon dating to determine the minimum residence time of the endangered thread-leaved sundew (Drosera filiformis Raf.) in three bogs of southern Nova Scotia. The minimum residence times are 4240 cal. year BP for Swain's Road Bog, 2050 cal. year BP for Villagedale Bog, and very recent (modern radiocarbon age) for Port La Tour Bog, indicating that the species has likely been in the region for the past 4240 years. Analysis of nearby Old School Road Bog, which lacks D. filiformis today, failed to find any evidence that it formerly occurred there, suggesting that it may not have been more widespread in the past than it is today.Key words: Drosera filiformis, thread-leaved sundew, plant macrofossil analysis, radiocarbon dating, bogs, minimum residence time.

scholarly journals Drying Machines with Combined Hydrodynamic Regimes

2021 ◽  
Vol 1199 (1) ◽  
pp. 012093
Author(s):  
N Artyukhova ◽  
J Krmela ◽  
V Krmelová ◽  
A Artyukhov
Keyword(s):  
Engineering Design ◽  
Cross Section ◽  
Residence Time ◽  
Working Space ◽  
Optimization Calculation ◽  
Polydisperse Material ◽  
Factors Of Influence ◽  
Minimum Residence Time ◽  
Dispersed Material ◽  
Free Area

Abstract The article is devoted to the study of multistage dryers with vertical sectioning of the working space. The factors of influence of the design of the shelf contact and the consumption of the drying agent on the mode of movement of monodisperse and polydisperse material are analyzed. The achievement of the required hydrodynamic regime (at a constant consumption of the drying agent) was ensured by changing the length of the shelf contact, the angle of its inclination to the horizon, and the degree of perforation (free area of cross-section). The features of changing the mode of granular material movement at various stages of the gravitational shelf dryer are shown. A technique for the optimization calculation of a gravitational shelf dryer is proposed. As an objective function, the minimum residence time of the dispersed material in the dryer is taken, at which the required amount of moisture is removed. Variants of the designs of the stages of a gravitational shelf dryer are shown and the features of the movement of dispersed material on the steps are described. The results obtained can be used as the basis for the engineering design of gravitational shelf dryers.

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