Author: Ramaswamy BalasubramaniamPublisher:
ISBN:
Category :
Languages : en
Pages : 52
Book Description
Microgravity Liquid-gas Two-phase Flow
Author: Ramaswamy BalasubramaniamPublisher:
ISBN:
Category :
Languages : en
Pages : 52
Book Description
Physics of Fluids in Microgravity
Author: Rodolfo MontiPublisher: CRC Press
ISBN: 1482265052
Category : Science
Languages : en
Pages : 625
Book Description
In a microgravity experiment, the conditions prevalent in fluid phases can be substantially different from those on the ground and can be exploited to improve different processes. Fluid physics research in microgravity is important for the advancement of all microgravity scients: life, material, and engineering. Space flight provides a uniqu
Prediction of Gas-liquid Two-phase Flow Regime in Microgravity
Author: Jinho LeePublisher:
ISBN:
Category : Reduced gravity environments
Languages : en
Pages : 40
Book Description
Scaling Analysis of Gas-liquid Two-phase Flow Pattern in Microgravity
Author: Jinho LeePrediction of Gas-Liquid Two-Phase Flow Regime in Microgravity
Author: National Aeronautics and Space Adm NasaPublisher: Independently Published
ISBN: 9781729233887
Category : Science
Languages : en
Pages : 44
Book Description
An attempt is made to predict gas-liquid two-phase flow regime in a pipe in a microgravity environment through scaling analysis based on dominant physical mechanisms. Simple inlet geometry is adopted in the analysis to see the effect of inlet configuration on flow regime transitions. Comparison of the prediction with the existing experimental data shows good agreement, though more work is required to better define some physical parameters. The analysis clarifies much of the physics involved in this problem and can be applied to other configurations. Lee, Jinho and Platt, Jonathan A. Glenn Research Center RTOP 694-03-0A
Second Microgravity Fluid Physics Conference
Author: Publisher:
ISBN:
Category : Fluid dynamics (Space environment)
Languages : en
Pages : 552
Book Description
Microgravity Two-phase Flow and Heat Transfer
Author: Kamiel S. GabrielPublisher: Springer Science & Business Media
ISBN: 1402051433
Category : Technology & Engineering
Languages : en
Pages : 252
Book Description
Multiphase thermal systems have numerous applications in aerospace, heat-exchange, transport of contaminants in environmental systems, and energy transport and conversion systems. A reduced - or microgravity - environment provides an excellent tool for accurate study of the flow without the masking effects of gravity. This book presents for the first time a comprehensive coverage of all aspects of two-phase flow behaviour in the virtual absence of gravity.
Studies of Two-phase Gas-liquid Flow in Microgravity
Author: William Scott BousmanPublisher:
ISBN:
Category : Fluids
Languages : en
Pages : 316
Book Description
Studies of Two-Phase Flow Dynamics and Heat Transfer at Reduced Gravity Conditions
Author: An Analysis of Two-phase Flows in Conditions Relevant to Microgravity
Author: Santiago Arias CalderonPublisher:
ISBN:
Category :
Languages : en
Pages : 164
Book Description
Promising technological applications of two-phase flows in space have captured the increasing interest of the space sector, provoking a strong demand for more fundamental knowledge. Great efforts have been made in recent decades to study the behavior of two-phase flows in low-gravity environments, which is expected to be different than the behavior observed in the presence of gravitational forces. Nevertheless, many phenomena are still poorly understood. The development of any of these new technologies demands a better knowledge of two-phase flows. In this manuscript we address questions regarding the generation of gas-liquid flows and their behavior in conditions relevant for a microgravity environment. In particular, we focus on an air-water mixture formed in a capillary T-junction. To this end, an experimental setup has been designed to accurately control both gas and liquid flow rates. We performed a quantitative characterization on ground of the T-junction, whose operation is robust to changes in gravity level. Its main performance is the generation of bubbles at a regular frequency with small size dispersion. We obtained two working regimes of the T-junction and identified the crossover region between them. Bubble, slug, churn and annular flow regimes have been observed during the experiments and a flow pattern map has been plotted. We present an experimental study on the bubble-slug transition in microgravity-related conditions. In addition, we address questions regarding the existence of a critical void fraction in order for the bubble-slug transition to occur. The gas-liquid flow has been characterized by measuring the bubble generation frequency as well as the bubble and liquid slug sizes. Since bubble dynamics is also expected to be different in the absence of buoyancy, the bubble velocity has also been studied. The mean void fraction appears as one relevant parameter that allows for the prediction of frequency, bubble velocity, and lengths. We propose curves obtained empirically for the behavior of generation frequency, the bubble velocity and the lengths. The dependence of the frequency on the Strouhal dimensionless number has been analyzed. A numerical study of the formation of mini-bubbles in a 2D T-junction by means of the fluid dynamics numerical code JADIM is also presented. Simulations were carried out for different flow conditions, giving rise to results on the bubble generation frequency, bubble velocity, void fraction and characteristic lengths. Numerical results have been then compared with experimental data.