Improvement of the dust transfer system of an industrial unit using numerical solution

2021 ◽  
Author(s):  
M. Vahidi Ghazvini ◽  
A. Noorpoor
Keyword(s):  
Numerical Solution ◽  
Transfer System ◽  
Industrial Unit

Fluid Mechanics of Zero-G Propellant Transfer in Spacecraft Propulsion Systems

1965 ◽  
Vol 87 (1) ◽  
pp. 1-8 ◽  
Author(s):  
D. F. Gluck ◽  
J. P. Gille
Keyword(s):  
Gravitational Field ◽  
Fluid Mechanics ◽  
Numerical Solution ◽  
Settling Time ◽  
Promising Method ◽  
Transfer System ◽  
Basic Requirement ◽  
Propulsion Systems ◽  
Engine Operation ◽  
Critical Acceleration

The basic requirement of a transfer system for storable propellants is to provide propellant in sufficient quantity to assure proper engine operation. The main propulsion systems of advanced spacecraft will make many restarts after long coast periods during which the propellant is in a weightless state. Various vehicle motions, such as rotational maneuvers, may result in dislocation of propellant from the region of the outlet of un-baffled tanks. In this paper a promising method of propellant relocation, settling by means of an induced gravitational field, is considered. Small axially directed rockets are used to generate a low g-field for settling the propellant. The value of the acceleration that must be exceeded to assure propellant flow from top to bottom of the tanks (the critical acceleration) has been determined by a numerical solution of the interface equation. This acceleration is exceeded by several orders of magnitude for practical settling rocket systems. The fluid mechanics of the ensuing “settling” flow and the subsequent rebound or “geysering” is discussed and a criterion for settling time is suggested. These results were obtained through scaled experiments conducted at 1-g conditions.

Stability in the informal value transfer systems: norms of trust or institutions of control?

2017 ◽  
pp. 120-130
Author(s):  
A. Lyasko
Keyword(s):  
Social Control ◽  
Institutional Economics ◽  
Theoretic Model ◽  
Transfer System ◽  
Value Transfer ◽  
Partner Interaction ◽  
Game Theoretic ◽  
Game Theoretic Model ◽  
Informal Value Transfer System

Informal financial operations exist in the shadow of official regulation and cannot be protected by the formal legal instruments, therefore raising concerns about the enforcement of obligations taken by their participants. This paper analyzes two alternative types of auxiliary institutions, which can coordinate expectations of the members of informal value transfer systems, namely attitudes of trust and norms of social control. It offers some preliminary approaches to creating a game-theoretic model of partner interaction in the informal value transfer system. It also sheds light on the perspectives of further studies in this area of institutional economics.

Backscattering Analysis of Cylinder Shaped Scatterer in Vegetation Medium: Comparison Between Theories

2020 ◽  
Vol 2 (1) ◽  
pp. 15-18
Author(s):  
Syabeela Syahali ◽  
Ewe Hong Tat ◽  
Gobi Vetharatnam ◽  
Li-Jun Jiang ◽  
Hamsalekha A Kumaresan
Keyword(s):  
Numerical Solution ◽  
Cross Section ◽  
Traditional Method ◽  
Microwave Remote Sensing ◽  
Solution Model ◽  
Complex Nature ◽  
Good Match ◽  
Equivalent Source ◽  
Backscattering Cross Section ◽  
Method Model

This paper analyses the backscattering cross section of a cylinder both using traditional method model and a new numerical solution model, namely Relaxed Hierarchical Equivalent Source Algorithm (RHESA). The purpose of this study is to investigate the prospect of incorporating numerical solution model into volume scattering calculation, to be applied into microwave remote sensing in vegetation area. Results show a good match, suggesting that RHESA may be suitable to be used to model the more complex nature of vegetation medium.

Sign in / Sign up

Export Citation Format

Share Document