Slug to annular flow transition of microgravity two-phase flow

Zhao, Jian-Fu; Hu, Wenrui

doi:10.1016/s0301-9322(99)00088-9

Cited by 42 publications

(11 citation statements)

References 15 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…8). The transitions between adjoining flow patterns were found to be more or less the same as those in straight pipes, and can be predicted satisfactorily by the Weber number models (Zhao & Hu, 2000;Lowe & Rezkallah, 1999). Attention was also paid to the difference of the flow structure between single-and two-phase flows.…”

Section: Two-phase Flow Pattern Maps In Microgravitymentioning

confidence: 77%

“…A semi-theoretical Weber number model was developed firstly by Zhao & Hu (2000), and later modified by Zhao et al (2001a), which was based on the balance between the impulsive force due to the gas inertia and the surface tension force near the slug-toannular flow transition in microgravity. This model can be written in the following dimensionless form…”

Section: Two-phase Gas-liquid Flows In Pipelines In Microgravity 21 mentioning

confidence: 99%

“…7, while that obtained from the ground control tests in normal gravity was also shown for comparison. If the slug-annular flow is considered as no one of the major flow patterns but a transitional one between the slug and annular flows, the semi-theoretical Weber number model of Zhao & Hu (2000) with the improvement about the shape influence can predict well the slug-to-annular flow transition both in normal and in microgravity. The prediction by Jayawardena et al (1997) was also in reasonable agreement with the observed boundary between bubble and slug flows in microgravity.…”

Section: Two-phase Flow Pattern Maps In Microgravitymentioning

confidence: 99%

See 2 more Smart Citations

Flow Patterns, Pressure Drops and Other Related Topics of Two-Phase Gas-Liquid Flow in Microgravity

Zhao¹

2011

Heat Transfer - Theoretical Analysis, Experimental Investigations and Industrial Systems

View full text Add to dashboard Cite

Section: Two-phase Flow Pattern Maps In Microgravitymentioning

confidence: 77%

Section: Two-phase Gas-liquid Flows In Pipelines In Microgravity 21 mentioning

confidence: 99%

Section: Two-phase Flow Pattern Maps In Microgravitymentioning

confidence: 99%

See 1 more Smart Citation

Flow Patterns, Pressure Drops and Other Related Topics of Two-Phase Gas-Liquid Flow in Microgravity

Zhao¹

2011

Heat Transfer - Theoretical Analysis, Experimental Investigations and Industrial Systems

View full text Add to dashboard Cite

“…In Fig.3, the present experimental data are compared with the prediction of the semi-theoretical Weber number model, which was proposed for circular channels by Zhao & Hu [29] and modified by Zhao et al t281 to conclude the shape influence of the test section. It has been verified that the predictions of this model are in good agreement with the data obtained from the twophase flow experiments at microgravity and the miniscale or/and neutral-buoyancy modeling at normal gravity environment.…”

Section: Bubblementioning

confidence: 99%

Two-phase flow patterns in a square mini-channel

Zhao

Liu

2004

J. of Therm. Sci.

View full text Add to dashboard Cite

This paper presents a new set of experimental data of air-water flow patterns in a channel with a cross-section of lxl mm 2. The ranges of the gas and liquid superficial velocities are 0.1~10 m/s and 0.2~7 m/s, respectively.Bubble, bubble-slug, slug, and frothy flows are observed. The present data are compared with other data in minichannels reported in literature, and also compared with those in normal channel at microgravity, in which the Bond number has the same order of magnitude. The slug-frothy boundary is in consistent with each other, but for the bubble-slug transition, a much smaller value for the transition quality in the drift-flux model is obtained in the present study than those predicted by the empirical relations for the case of microgravity. It's shown that the mini-scale modeling may not be an effective way to anticipate the bubble-slug transition of two-phase flow at microgravity.

show abstract

“…Carbogal and air were used as the liquid and the gas phase, respectively. Figure 3 shows some typical flow patterns observed in partial and microgravity conditions aboard the Russian Space Station Mir, while Figure 4 shows the comparisons of the experimental data with predictions of some commonly used models in the literature, including Zhao and Hu [22] , on flow pattern transition in microgravity. Some data in partial gravity conditions were also collected by rotating the experimental facility with constant speeds [23] .…”

Section: Experiments On Two-phase Gas-liquid Flowmentioning

confidence: 99%

Space experimental studies of microgravity fluid science in China

Long

Kang

et al. 2009

Chin. Sci. Bull.

View full text Add to dashboard Cite

Microgravity fluid physics is an important part of microgravity sciences, which consists of simple fluids of many new systems, gas-liquid two-phase flow and heat transfer, and complex fluid mechanics. In addition to the importance of itself in sciences and applications, microgravity fluid physics closely relates to microgravity combustion, space biotechnology and space materials science, and promotes the developments of interdisciplinary fields. Many space microgravity experiments have been performed on board the recoverable satellites and space ships of China and pushed the rapid development of microgravity sciences in China. In the present paper, space experimental studies and the main results of the microgravity fluid science in China in the last 10 years or so are introduced briefly. microgravity fluid physics, microgravity gas-liquid two-phase flow, microgravity complex fluid, microgravity combustion, space biotechnologyThe technologies of rockets and satellites require the study of the fluid management problem in the storage tanks, and such problems of microgravity engineering in the microgravity environment have been studied in China during the development of space technology [1] . Studies on microgravity sciences in China were started in the late 1980s, when the scientists completed some space experiments on board the Chinese recoverable satellites by the promotion of the National HighTechnology Research Program of China. Main research subjects were the scientific experiments of materials science, in charged by the experts of the Institute of Semiconductor of the Chinese Academy of Sciences (CAS) and the Lanzhou Institute of Physics [2][3][4] , and experiments of space biology, in charged by the experts of life sciences in the CAS [5][6][7] . Some nice results were obtained, although resources of space experiments on board the recoverable satellite were relatively limited in the preliminary period.Microgravity fluid physics is an import part of microgravity sciences, and requires relatively complicated experimental facility in general, mostly the optical diagnostic instrumentations. Theoretical and experimental studies of the microgravity fluid physics on the ground were started relatively early in China [8] ; the scientists of China and Japan jointly completed the microgravity experiments of the thermocapillary convection in floating half zone [9] and drop Marangoni migration [10] using the JAMIC drop shift in Hokkaido and the MGLAB drop shift in Toki respectively before the foundation of the Beijing Drop Tower, and the experimental results were nice. China's first space experiment of fluid physics was completed 10 years later after the initiation of one of the materials science. The experiments of Marangoni convection and thermocapillary convection in two immiscible liquid layers were performed on board the SJ-5

show abstract

Slug to annular flow transition of microgravity two-phase flow

Cited by 42 publications

References 15 publications

Flow Patterns, Pressure Drops and Other Related Topics of Two-Phase Gas-Liquid Flow in Microgravity

Flow Patterns, Pressure Drops and Other Related Topics of Two-Phase Gas-Liquid Flow in Microgravity

Two-phase flow patterns in a square mini-channel

Space experimental studies of microgravity fluid science in China

Contact Info

Product

Resources

About