Using a modified single-phase model to predict microgravity flow boiling heat transfer in the bubbly flow regime

Lebon, Michel T.; Hammer, Caleb F.; Kim, Jungho

doi:10.1080/08916152.2020.1782534

Cited by 3 publications

(3 citation statements)

References 22 publications

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“…They managed to reach 250 fps with the help of a high-speed camera, yet they could not perform any measurement longer than 3 s due to the significant photobleaching effect of the thermal-sensitive paint. Baba et al managed to use another type of TSP to visualize the boiling heat transfer during flow, while others , have used it for two-phase heat transfer in other settings. The main drawbacks of TSP are its extremely short lifetime and long response time of tens of microseconds, which makes it only suitable for extremely short observations.…”

Section: Introductionmentioning

confidence: 99%

Development of Perovskite Quantum Dots for Two-Dimensional Temperature Sensors

Zhu

Buitenhuis

Förster

et al. 2023

ACS Appl. Nano Mater.

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In situ temperature measurement for closed systems is always challenging due to various physical limitations. With the aim to visualize the heat transfer phenomena in situ continuously with a longer time scale, octylamine substituted CsPbBr3 perovskite quantum dots (QDs) are synthesized, leading to its thermo-sensitity being doubled. An optical-based 2D temperature sensor based on these ligand-modified QDs is developed, targeting microreactors and other circumstances where conventional thermal sensing protocols are not applicable. The developed method has the advantages of repeatability, long lifetime, low cost, fast response time, and broader applicability since it does not require IR transparent substrates. On top of these advantages, the proposed method also provides satisfactory spatial and temporal resolution, which is typically limited by the camera’s specification rather than the materials.

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Section: Introductionmentioning

confidence: 99%

Development of Perovskite Quantum Dots for Two-Dimensional Temperature Sensors

Zhu

Buitenhuis

Förster

et al. 2023

ACS Appl. Nano Mater.

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“…From the beginnings of the 2000s the number of flow boiling experiments in tubes increased. Several results were reported on the detailed characterization of flow pattern and heat transfer coefficient including critical heat flux with different refrigerants R113, FC72, HFE7000, HFE7100 [10][11][12][13][14][15][16][17][18][19][20]. Several review articles have been published sumarising the main results: [5,10,12,[21][22][23].…”

Section: Introductionmentioning

confidence: 99%

Conception of a compact flow boiling loop for the International Space Station- First results in parabolic flights

Chorin¹,

Boned²,

Sebilleau³

et al. 2023

Comptes Rendus. Mécanique

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The design of a pipe flow boiling experiment for the International Space Station is proposed, taking into account typical weight, power consumption and size constraints. The effect of singularities such as elbows upstream the test section is investigated. Velocity profiles downstream two elbows, measured by Particle Image Velocimetry are in good agreement with numerical simulation and allow to determine a specific distance (decay length) downstream the elbows for which the velocity profile recover its axisymmetry. From these results a breadboard is designed and tested in parabolic flights. Care has been taken to generate boiling downstream the decay length. Two-phase bubbly flow is observed with 2 perpendicular high-speed cameras in the test section and a symmetry of the bubble distribution in the pipe is verified for different gravity conditions when the bubbles are created after the decay length.

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“…The model acquired by Steven [9] made a set of relatively correct predictions with an uncertainty of 19.04%. Other phenomena such as the bubble dynamics and the vaporization feature are also investigated [10][11][12][13][14]; however, the aspects of the studies were mainly focused on the first law of thermodynamics, lacking the analysis that is based on the second law of thermodynamics.…”

Section: Introductionmentioning

confidence: 99%

Entropy Generation Analysis of the Flow Boiling in Microgravity Field

Sun

Zhang

Wang

et al. 2022

Entropy

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Entropy generation analysis of the flow boiling in microgravity field is conducted in this paper. A new entropy generation model based on the flow pattern and the phase change process is developed in this study. The velocity ranges from 1 m/s to 4 m/s, and the heat flux ranges from 10,000 W/m2 to 50,000 W/m2, so as to investigate their influence on irreversibility during flow boiling in the tunnel. A phase–change model verified by the Stefan problem is employed in this paper to simulate the phase–change process in boiling. The numerical simulations are carried out on ANSYS-FLUENT. The entropy generation produced by the heat transfer, viscous dissipation, turbulent dissipation, and phase change are observed at different working conditions. Moreover, the Be number and a new evaluation number, EP, are introduced in this paper to investigate the performance of the boiling phenomenon. The following conclusions are obtained: (1) a high local entropy generation will be obtained when only heat conduction in vapor occurs near the hot wall, whereas a low local entropy generation will be obtained when heat conduction in water or evaporation occurs near the hot wall; (2) the entropy generation and the Be number are positively correlated with the heat flux, which indicates that the heat transfer entropy generation becomes the major contributor of the total entropy generation with the increase of the heat flux; (3) the transition of the boiling status shows different trends at different velocities, which affects the irreversibility in the tunnel; (4) the critical heat flux (CHF) is the optimal choice under the comprehensive consideration of the first law and the second law of the thermodynamics.

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Using a modified single-phase model to predict microgravity flow boiling heat transfer in the bubbly flow regime

Cited by 3 publications

References 22 publications

Development of Perovskite Quantum Dots for Two-Dimensional Temperature Sensors

Development of Perovskite Quantum Dots for Two-Dimensional Temperature Sensors

Conception of a compact flow boiling loop for the International Space Station- First results in parabolic flights

Entropy Generation Analysis of the Flow Boiling in Microgravity Field

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