Review of flow boiling and critical heat flux in microgravity

Konishi, Christopher; Mudawar, Issam

doi:10.1016/j.ijheatmasstransfer.2014.09.017

Cited by 140 publications

(54 citation statements)

References 118 publications

(150 reference statements)

Supporting

Mentioning

Contrasting

Order By: Relevance

“…8,9 A similar experimental study covering a large range of conditions is needed for reduced gravity. Two-phase boiling data with water, refrigerants, and other noncryogenic liquids in reduced gravity have shown that the lack of gravity significantly alters the flow patterns and heat transfer from what is seen in 1-g. 10,11 The general observations from these experiments show that the absence of a buoyancy force in reduced gravity lowers the heat transfer because the only mechanism available to sweep vapor bubbles away from the surface is the drag and inertial forces from the bulk fluid motion. Vapor bubbles generated at the surface can more easily coalesce to form an insulating barrier between the liquid phase and the wall.…”

Section: Introductionmentioning

confidence: 96%

“…In 1-g conditions, the flow patterns are very tortuous and the liquid and vapor are broken into small droplets and bubbles, whereas microgravity flow boiling experiences large continuous patches of the two phases with smooth interfaces. 10,20 The existing two-phase flow boiling data in reduced gravity consist primarily of nucleate boiling heat transfer and critical heat flux measurements. 10,11 Only a few quenching studies in reduced gravity conditions exist that cover the entire chilldown process, including film boiling heat transfer and the rewetting temperature.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

The effect of reduced gravity on cryogenic nitrogen boiling and pipe chilldown

et al. 2016

View full text Add to dashboard Cite

Manned deep space exploration will require cryogenic in-space propulsion. Yet, accurate prediction of cryogenic pipe flow boiling heat transfer is lacking, due to the absence of a cohesive reduced gravity data set covering the expected flow and thermodynamic parameter ranges needed to validate cryogenic two-phase heat transfer models. This work provides a wide range of cryogenic chilldown data aboard an aircraft flying parabolic trajectories to simulate reduced gravity. Liquid nitrogen is used to quench a 1.27 cm diameter tube from room temperature. The pressure, temperature, flow rate, and inlet conditions are reported from 10 tests covering liquid Reynolds number from 2,000 to 80,000 and pressures from 80 to 810 kPa. Corresponding terrestrial gravity tests were performed in upward, downward, and horizontal flow configurations to identify gravity and flow direction effects on chilldown. Film boiling heat transfer was lessened by up to 25% in reduced gravity, resulting in longer time and more liquid to quench the pipe to liquid temperatures. Heat transfer was enhanced by increasing the flow rate, and differences between reduced and terrestrial gravity diminished at high flow rates. The new data set will enable the development of accurate and robust heat transfer models of cryogenic pipe chilldown in reduced gravity.

show abstract

Section: Introductionmentioning

confidence: 96%

Section: Introductionmentioning

confidence: 99%

The effect of reduced gravity on cryogenic nitrogen boiling and pipe chilldown

et al. 2016

View full text Add to dashboard Cite

show abstract

“…Konishi and Mudawar [5] made a thorough review about the flow boiling and CHF in microgravity discussing several models for predicting CHF and highlighting the need for further research emphasis on condensation flow and heat transfer characteristics under reduced gravity.…”

Section: Introductionmentioning

confidence: 99%

The effect of gravity on R410A condensing flow in horizontal circular tubes

Zhang

et al. 2017

Numerical Heat Transfer, Part A: Applications

View full text Add to dashboard Cite

Heat transfer characteristics of R410A condensation in horizontal tubes with inner diameter of 3.78 mm under normal and reduced gravity are investigated numerically. The mass transfer model and numerical methods are validated by comparing the numerical heat transfer coefficients under normal gravity with the experimental work and empirical correlations. The results indicate that the heat transfer coefficients increase with increasing gravitational accelerations at a lower mass flux, while the difference of these under varing gravity is insignificant at a higher mass flux. The liquid film thickness decreases with increasing gravity at the top part of the tube at vapor quality x = 0.5 and 0.9, while the reverse is true for that at the tube bottom. The average liquid film thickness is nearly the same under different gravity accelerations at the same vapor quality and mass flux. The local heat transfer coefficients increase with increasing gravity at the top of the tube and decrease with increases in gravity at the bottom. The proportion of the thin liquid film region is important for the overall heat transfer coefficients for the condensing flow. A vortex with its core lying at the bottom of the tube is observed under normal gravity because of the combined effect of gravity and the mass sink at the liquid-vapor interface, while the stream traces point to the liquid-vapor interfaces under zero gravity. The mass transfer rate under zero gravity is much lower than that of normal gravity.

show abstract

“…Electronic cooling by using boiling system in space vehicles and in earth orbiting station has become an increasing significant subject due to its high efficiency in heat transfer [2][3][4].…”

Section: Introductionmentioning

confidence: 99%